12-byte interleaver
This commit is contained in:
Mark Qvist
parent
35a92e167e
commit
2462188597
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@ -3,8 +3,8 @@
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#define FSK_CFG
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// Debug & test options
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#define SERIAL_DEBUG false
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#define PASSALL false
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#define SERIAL_DEBUG true
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#define PASSALL true
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#define AUTOREPLY false
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// Modem options
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@ -17,7 +17,7 @@
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#define CONFIG_AFSK_RXTIMEOUT 0 // How long a read operation from the modem
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// will wait for data before timing out.
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#define CONFIG_AFSK_PREAMBLE_LEN 250UL // The length of the packet preamble in milliseconds
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#define CONFIG_AFSK_PREAMBLE_LEN 450UL // The length of the packet preamble in milliseconds
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#define CONFIG_AFSK_TRAILER_LEN 20UL // The length of the packet tail in milliseconds
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#endif
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@ -68,15 +68,18 @@ static void mp1Decode(MP1 *mp1) {
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// If header indicates a padded packet, remove
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// padding
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uint8_t padding = header >> 4;
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if (header & MP1_HEADER_PADDED) {
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buffer++;
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for (int i = 0; i < padding; i++) {
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buffer++;
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}
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}
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if (SERIAL_DEBUG) kprintf("[TS=%d] ", mp1->packetLength);
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// Set the payload length of the packet to the counted
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// length minus 1, so we remove the checksum
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packet.dataLength = mp1->packetLength - 2 - (header & 0x01);
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packet.dataLength = mp1->packetLength - 2 - (header & 0x01)*padding;
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// Check if we have received a compressed packet
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if (header & MP1_HEADER_COMPRESSION) {
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@ -121,101 +124,128 @@ void mp1Poll(MP1 *mp1) {
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// HDLC_FLAG), we will start looking at the
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// incoming data and perform forward error
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// correction on it.
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if ((mp1->reading && (byte != AX25_ESC )) || (mp1->reading && (mp1->escape && byte == AX25_ESC))) {
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if ((mp1->reading && (byte != AX25_ESC )) || (mp1->reading && (mp1->escape && (byte == AX25_ESC || byte == HDLC_FLAG || byte == HDLC_RESET)))) {
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mp1->readLength++;
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// Check if we have read three bytes. If we
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// have, we should now have a block of two
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// data bytes and a parity byte. This block
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if (mp1->readLength % 3 == 0) {
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if (mp1->readLength % MP1_INTERLEAVE_SIZE == 0) {
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// If the last character in the block
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// looks like a control character, we
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// need to set the escape indicator to
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// false, since the next byte will be
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// read immediately after the FEC
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// routine, and thus, the normal reading
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// code will not reset the indicator.
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if (byte == AX25_ESC || byte == HDLC_FLAG || byte == HDLC_RESET) mp1->escape = false;
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// The block is interleaved, so we will
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// first put the received bytes in the
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// deinterleaving buffer
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mp1->interleaveIn[0] = mp1->buffer[mp1->packetLength-2];
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mp1->interleaveIn[1] = mp1->buffer[mp1->packetLength-1];
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mp1->interleaveIn[2] = byte;
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for (int i = 1; i < MP1_INTERLEAVE_SIZE; i++) {
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mp1->interleaveIn[i-1] = mp1->buffer[mp1->packetLength-(MP1_INTERLEAVE_SIZE-i)];
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}
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mp1->interleaveIn[MP1_INTERLEAVE_SIZE-1] = byte;
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// We then deinterleave the block
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mp1Deinterleave(mp1);
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// And write the deinterleaved data
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// back into the buffer
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mp1->buffer[mp1->packetLength-2] = mp1->interleaveIn[0];
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mp1->buffer[mp1->packetLength-1] = mp1->interleaveIn[1];
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// Adjust the packet length, since we will get
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// parity bytes in the data buffer with block
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// sizes larger than 3
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mp1->packetLength -= MP1_INTERLEAVE_SIZE/3 - 1;
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// We now calculate a parity byte on the
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// received data.
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mp1->calculatedParity = mp1ParityBlock(mp1->buffer[mp1->packetLength-2], mp1->buffer[mp1->packetLength-1]);
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// For each 3-byte block in the deinterleaved
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// bytes, we apply forward error correction
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for (int i = 0; i < MP1_INTERLEAVE_SIZE; i+=3) {
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// We now calculate a parity byte on the
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// received data.
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// By XORing the calculated parity byte
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// with the received parity byte, we get
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// what is called the "syndrome". This
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// number will tell us if we had any
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// errors during transmission, and if so
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// where they are. Using Hamming code, we
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// can only detect single bit errors in a
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// byte though, which is why we interleave
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// the data, since most errors will usually
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// occur in bursts of more than one bit.
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// With 2 data byte interleaving we can
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// correct 2 consecutive bit errors.
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uint8_t syndrome = mp1->calculatedParity ^ mp1->interleaveIn[2];
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if (syndrome == 0x00) {
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// If the syndrome equals 0, we either
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// don't have any errors, or the error
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// is unrecoverable, so we don't do
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// anything
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} else {
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// If the syndrome is not equal to 0,
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// there is a problem, and we will try
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// to correct it. We first need to split
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// the syndrome byte up into the two
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// actual syndrome numbers, one for
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// each data byte.
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uint8_t syndromes[2];
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syndromes[0] = syndrome & 0x0f;
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syndromes[1] = (syndrome & 0xf0) >> 4;
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// Deinterleaved data bytes
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uint8_t a = mp1->interleaveIn[i];
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uint8_t b = mp1->interleaveIn[i+1];
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// Then we look at each syndrome number
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// to determine what bit in the data
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// bytes to correct.
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for (int i = 0; i < 2; i++) {
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uint8_t s = syndromes[i];
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uint8_t correction = 0x00;
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if (s == 1 || s == 2 || s == 4 || s == 8) {
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// This signifies an error in the
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// parity block, so we actually
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// don't need any correction
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continue;
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// Deinterleaved parity byte
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uint8_t p = mp1->interleaveIn[i+2];
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mp1->calculatedParity = mp1ParityBlock(a, b);
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// By XORing the calculated parity byte
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// with the received parity byte, we get
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// what is called the "syndrome". This
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// number will tell us if we had any
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// errors during transmission, and if so
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// where they are. Using Hamming code, we
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// can only detect single bit errors in a
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// byte though, which is why we interleave
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// the data, since most errors will usually
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// occur in bursts of more than one bit.
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// With 2 data byte interleaving we can
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// correct 2 consecutive bit errors.
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uint8_t syndrome = mp1->calculatedParity ^ p;
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if (syndrome == 0x00) {
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// If the syndrome equals 0, we either
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// don't have any errors, or the error
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// is unrecoverable, so we don't do
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// anything
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} else {
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// If the syndrome is not equal to 0,
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// there is a problem, and we will try
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// to correct it. We first need to split
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// the syndrome byte up into the two
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// actual syndrome numbers, one for
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// each data byte.
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uint8_t syndromes[2];
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syndromes[0] = syndrome & 0x0f;
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syndromes[1] = (syndrome & 0xf0) >> 4;
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// Then we look at each syndrome number
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// to determine what bit in the data
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// bytes to correct.
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for (int i = 0; i < 2; i++) {
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uint8_t s = syndromes[i];
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uint8_t correction = 0x00;
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if (s == 1 || s == 2 || s == 4 || s == 8) {
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// This signifies an error in the
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// parity block, so we actually
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// don't need any correction
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continue;
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}
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// The following determines what
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// bit to correct according to
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// the syndrome value.
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if (s == 3) correction = 0x01;
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if (s == 5) correction = 0x02;
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if (s == 6) correction = 0x04;
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if (s == 7) correction = 0x08;
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if (s == 9) correction = 0x10;
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if (s == 10) correction = 0x20;
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if (s == 11) correction = 0x40;
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if (s == 12) correction = 0x80;
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// And finally we apply the correction
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if (i == 1) a ^= correction;
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if (i == 0) b ^= correction;
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// This is just for testing purposes.
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// Nice to know when corrections were
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// actually made.
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if (s != 0) mp1->correctionsMade += 1;
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}
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// The following determines what
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// bit to correct according to
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// the syndrome value.
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if (s == 3) correction = 0x01;
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if (s == 5) correction = 0x02;
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if (s == 6) correction = 0x04;
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if (s == 7) correction = 0x08;
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if (s == 9) correction = 0x10;
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if (s == 10) correction = 0x20;
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if (s == 11) correction = 0x40;
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if (s == 12) correction = 0x80;
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// And finally we apply the correction
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mp1->buffer[mp1->packetLength-(2-i)] ^= correction;
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// This is just for testing purposes.
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// Nice to know when corrections were
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// actually made.
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if (s != 0) mp1->correctionsMade += 1;
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}
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}
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// We now update the checksum of the packet
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// with the deinterleaved and possibly
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// corrected bytes.
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mp1->checksum_in ^= mp1->buffer[mp1->packetLength-2];
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mp1->checksum_in ^= mp1->buffer[mp1->packetLength-1];
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// We now update the checksum of the packet
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// with the deinterleaved and possibly
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// corrected bytes.
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mp1->checksum_in ^= a;
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mp1->checksum_in ^= b;
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mp1->buffer[mp1->packetLength-(MP1_DATA_BLOCK_SIZE)+((i/3)*2)] = a;
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mp1->buffer[mp1->packetLength-(MP1_DATA_BLOCK_SIZE-1)+((i/3)*2)] = b;
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}
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continue;
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}
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@ -234,7 +264,7 @@ void mp1Poll(MP1 *mp1) {
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if (!mp1->escape && byte == HDLC_FLAG) {
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// We are not in an escape sequence and we
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// found a HDLC_FLAG. This can mean two things:
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if (mp1->packetLength >= MP1_MIN_FRAME_LENGTH) {
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if (mp1->readLength >= MP1_MIN_FRAME_LENGTH) {
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// We already have more data than the minimum
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// frame length, which means the flag signifies
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// the end of the packet. Pass control to the
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@ -279,6 +309,7 @@ void mp1Poll(MP1 *mp1) {
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// the escape seqeunce indicator so we don't
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// interpret the next byte as a reset or flag
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mp1->escape = true;
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// We then continue reading the next byte.
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continue;
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}
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@ -400,36 +431,43 @@ void mp1Send(MP1 *mp1, void *_buffer, size_t length) {
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// since we are sending a parity byte for every
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// two data bytes sent, and because interleaving
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// happens in blocks of three bytes.
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uint8_t header = 0xf0;
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uint8_t header = 0x00;
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// If we are using compression, set the
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// appropriate header flag to true.
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if (packetCompression) header ^= MP1_HEADER_COMPRESSION;
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// We check if the data length is even
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if (length % 2 != 0) {
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// If it is not, we set the appropriate
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// We check if the data length matches our
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// required block size
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uint8_t padding = (length+2) % MP1_DATA_BLOCK_SIZE;
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if (padding != 0) {
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// If it does not, we set the appropriate
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// header flag to indicate that we are
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// padding this packet with one byte.
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// padding this packet.
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header ^= MP1_HEADER_PADDED;
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// And calculate how much padding we need
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padding = MP1_DATA_BLOCK_SIZE - padding;
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// And put the amount of padding we are
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// going to append in the header
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header ^= (padding << 4);
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// We then update the checksum with the
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// header byte and queue it for transmit
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mp1->checksum_out = mp1->checksum_out ^ header;
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mp1Putbyte(mp1, header);
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// We now update the checksum with the
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// padding byte, and queue that for
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// transmission as well. At this point,
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// we will have pushed out two bytes of
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// data. The output function will detect
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// this, and a parity byte will be
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// calculated. The 3-byte block is then
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// actually transmitted.
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mp1->checksum_out = mp1->checksum_out ^ MP1_PADDING;
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mp1Putbyte(mp1, MP1_PADDING);
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// padding bytes, and queue these for
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// transmission as well.
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for (int i = 0; i < padding; i++) {
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mp1->checksum_out = mp1->checksum_out ^ MP1_PADDING;
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mp1Putbyte(mp1, MP1_PADDING);
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}
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} else {
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// If the length was already even, we
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// If the length already matches, we
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// just update the checksum with the
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// header byte and queue it.
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mp1->checksum_out = mp1->checksum_out ^ header;
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@ -478,132 +516,6 @@ int freeRam(void) {
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return FREE_RAM;
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}
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// Following is the functions responsible
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// for interleaving and deinterleaving
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// blocks of data. The interleaving table
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// is also included.
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///////////////////////////////
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// Interleave-table //
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///////////////////////////////
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//
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// Non-interleaved:
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// aaaaaaaa bbbbbbbb cccccccc
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// 12345678 12345678 12345678
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// M L
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// S S
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// B B
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//
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// Interleaved:
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// abcabcab cabcabca bcabcabc
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// 11144477 22255578 63336688
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//
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//
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// 3bit burst error patterns:
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// X||||||| X||||||| X|||||||
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// |||X|||| X||||||| X|||||||
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// |||X|||| |||X|||| X|||||||
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// |||X|||| |||X|||| |||X||||
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// ||||||X| |||X|||| |||X||||
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// ||||||X| ||||||X| |||X||||
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// ||||||X| ||||||X| |X||||||
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// |X|||||| ||||||X| |X||||||
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// |X|||||| |X|||||| |X||||||
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// |X|||||| |X|||||| ||||X|||
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// ||||X||| |X|||||| ||||X|||
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// ||||X||| ||||X||| ||||X|||
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// ||||X||| ||||X||| ||||||X|
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// |||||||X ||||X||| ||||||X|
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// |||||||X |||||X|| ||||||X|
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// |||||||X |||||X|| ||X|||||
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// ||X||||| |||||X|| ||X|||||
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// ||X||||| ||X||||| ||X|||||
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// ||X||||| ||X||||| |||||X||
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// |||||X|| ||X||||| |||||X||
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// |||||X|| |||||||X |||||X||
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// |||||X|| |||||||X |||||||X
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//
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///////////////////////////////
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void mp1Interleave(MP1 *mp1, uint8_t byte) {
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mp1->interleaveOut[mp1->interleaveCounter] = byte;
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mp1->interleaveCounter++;
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if (mp1->interleaveCounter == 3) {
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// We have three bytes in the buffer and
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// are ready to interleave them.
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uint8_t a = (GET_BIT(mp1->interleaveOut[0], 1) << 7) +
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(GET_BIT(mp1->interleaveOut[1], 1) << 6) +
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(GET_BIT(mp1->interleaveOut[2], 1) << 5) +
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(GET_BIT(mp1->interleaveOut[0], 4) << 4) +
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(GET_BIT(mp1->interleaveOut[1], 4) << 3) +
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(GET_BIT(mp1->interleaveOut[2], 4) << 2) +
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(GET_BIT(mp1->interleaveOut[0], 7) << 1) +
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(GET_BIT(mp1->interleaveOut[1], 7));
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mp1WriteByte(mp1, a);
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uint8_t b = (GET_BIT(mp1->interleaveOut[2], 2) << 7) +
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(GET_BIT(mp1->interleaveOut[0], 2) << 6) +
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(GET_BIT(mp1->interleaveOut[1], 2) << 5) +
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(GET_BIT(mp1->interleaveOut[2], 5) << 4) +
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(GET_BIT(mp1->interleaveOut[0], 5) << 3) +
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(GET_BIT(mp1->interleaveOut[1], 5) << 2) +
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(GET_BIT(mp1->interleaveOut[2], 7) << 1) +
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(GET_BIT(mp1->interleaveOut[0], 8));
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mp1WriteByte(mp1, b);
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uint8_t c = (GET_BIT(mp1->interleaveOut[1], 6) << 7) +
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(GET_BIT(mp1->interleaveOut[2], 3) << 6) +
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(GET_BIT(mp1->interleaveOut[0], 3) << 5) +
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(GET_BIT(mp1->interleaveOut[1], 3) << 4) +
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(GET_BIT(mp1->interleaveOut[2], 6) << 3) +
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(GET_BIT(mp1->interleaveOut[0], 6) << 2) +
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(GET_BIT(mp1->interleaveOut[1], 8) << 1) +
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(GET_BIT(mp1->interleaveOut[2], 8));
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mp1WriteByte(mp1, c);
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// mp1WriteByte(mp1, a);
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// mp1WriteByte(mp1, b);
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// mp1WriteByte(mp1, c);
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mp1->interleaveCounter = 0;
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}
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}
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void mp1Deinterleave(MP1 *mp1) {
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uint8_t a = (GET_BIT(mp1->interleaveIn[0], 1) << 7) +
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(GET_BIT(mp1->interleaveIn[1], 2) << 6) +
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(GET_BIT(mp1->interleaveIn[2], 3) << 5) +
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(GET_BIT(mp1->interleaveIn[0], 4) << 4) +
|
||||
(GET_BIT(mp1->interleaveIn[1], 5) << 3) +
|
||||
(GET_BIT(mp1->interleaveIn[2], 6) << 2) +
|
||||
(GET_BIT(mp1->interleaveIn[0], 7) << 1) +
|
||||
(GET_BIT(mp1->interleaveIn[1], 8));
|
||||
|
||||
uint8_t b = (GET_BIT(mp1->interleaveIn[0], 2) << 7) +
|
||||
(GET_BIT(mp1->interleaveIn[1], 3) << 6) +
|
||||
(GET_BIT(mp1->interleaveIn[2], 4) << 5) +
|
||||
(GET_BIT(mp1->interleaveIn[0], 5) << 4) +
|
||||
(GET_BIT(mp1->interleaveIn[1], 6) << 3) +
|
||||
(GET_BIT(mp1->interleaveIn[2], 1) << 2) +
|
||||
(GET_BIT(mp1->interleaveIn[0], 8) << 1) +
|
||||
(GET_BIT(mp1->interleaveIn[2], 7));
|
||||
|
||||
uint8_t c = (GET_BIT(mp1->interleaveIn[0], 3) << 7) +
|
||||
(GET_BIT(mp1->interleaveIn[1], 1) << 6) +
|
||||
(GET_BIT(mp1->interleaveIn[2], 2) << 5) +
|
||||
(GET_BIT(mp1->interleaveIn[0], 6) << 4) +
|
||||
(GET_BIT(mp1->interleaveIn[1], 4) << 3) +
|
||||
(GET_BIT(mp1->interleaveIn[2], 5) << 2) +
|
||||
(GET_BIT(mp1->interleaveIn[1], 7) << 1) +
|
||||
(GET_BIT(mp1->interleaveIn[2], 8));
|
||||
|
||||
mp1->interleaveIn[0] = a;
|
||||
mp1->interleaveIn[1] = b;
|
||||
mp1->interleaveIn[2] = c;
|
||||
}
|
||||
|
||||
// This function compresses data using
|
||||
// the Heatshrink library
|
||||
size_t compress(uint8_t *input, size_t length) {
|
||||
|
|
@ -657,3 +569,353 @@ size_t decompress(uint8_t *input, size_t length) {
|
|||
heatshrink_decoder_free(hsd);
|
||||
return written;
|
||||
}
|
||||
|
||||
|
||||
// Following is the functions responsible
|
||||
// for interleaving and deinterleaving
|
||||
// blocks of data. The interleaving table
|
||||
// for 3-byte interleaving is also included.
|
||||
// The table for 12-byte is much simpler,
|
||||
// and should be inferable from looking
|
||||
// at the function.
|
||||
|
||||
///////////////////////////////
|
||||
// Interleave-table (3-byte) //
|
||||
///////////////////////////////
|
||||
//
|
||||
// Non-interleaved:
|
||||
// aaaaaaaa bbbbbbbb cccccccc
|
||||
// 12345678 12345678 12345678
|
||||
// M L
|
||||
// S S
|
||||
// B B
|
||||
//
|
||||
// Interleaved:
|
||||
// abcabcab cabcabca bcabcabc
|
||||
// 11144477 22255578 63336688
|
||||
//
|
||||
///////////////////////////////
|
||||
|
||||
void mp1Interleave(MP1 *mp1, uint8_t byte) {
|
||||
mp1->interleaveOut[mp1->interleaveCounter] = byte;
|
||||
mp1->interleaveCounter++;
|
||||
if (mp1->interleaveCounter == MP1_INTERLEAVE_SIZE) {
|
||||
// We have the bytes we need for interleaving
|
||||
// in the buffer and are ready to interleave them.
|
||||
#if MP1_INTERLEAVE_SIZE == 3
|
||||
// This is for 3-byte interleaving
|
||||
uint8_t a = (GET_BIT(mp1->interleaveOut[0], 1) << 7) +
|
||||
(GET_BIT(mp1->interleaveOut[1], 1) << 6) +
|
||||
(GET_BIT(mp1->interleaveOut[2], 1) << 5) +
|
||||
(GET_BIT(mp1->interleaveOut[0], 4) << 4) +
|
||||
(GET_BIT(mp1->interleaveOut[1], 4) << 3) +
|
||||
(GET_BIT(mp1->interleaveOut[2], 4) << 2) +
|
||||
(GET_BIT(mp1->interleaveOut[0], 7) << 1) +
|
||||
(GET_BIT(mp1->interleaveOut[1], 7));
|
||||
mp1WriteByte(mp1, a);
|
||||
|
||||
uint8_t b = (GET_BIT(mp1->interleaveOut[2], 2) << 7) +
|
||||
(GET_BIT(mp1->interleaveOut[0], 2) << 6) +
|
||||
(GET_BIT(mp1->interleaveOut[1], 2) << 5) +
|
||||
(GET_BIT(mp1->interleaveOut[2], 5) << 4) +
|
||||
(GET_BIT(mp1->interleaveOut[0], 5) << 3) +
|
||||
(GET_BIT(mp1->interleaveOut[1], 5) << 2) +
|
||||
(GET_BIT(mp1->interleaveOut[2], 7) << 1) +
|
||||
(GET_BIT(mp1->interleaveOut[0], 8));
|
||||
mp1WriteByte(mp1, b);
|
||||
|
||||
uint8_t c = (GET_BIT(mp1->interleaveOut[1], 6) << 7) +
|
||||
(GET_BIT(mp1->interleaveOut[2], 3) << 6) +
|
||||
(GET_BIT(mp1->interleaveOut[0], 3) << 5) +
|
||||
(GET_BIT(mp1->interleaveOut[1], 3) << 4) +
|
||||
(GET_BIT(mp1->interleaveOut[2], 6) << 3) +
|
||||
(GET_BIT(mp1->interleaveOut[0], 6) << 2) +
|
||||
(GET_BIT(mp1->interleaveOut[1], 8) << 1) +
|
||||
(GET_BIT(mp1->interleaveOut[2], 8));
|
||||
|
||||
mp1WriteByte(mp1, c);
|
||||
#elif MP1_INTERLEAVE_SIZE == 12
|
||||
// This is for 12-byte interleaving
|
||||
uint8_t a = (GET_BIT(mp1->interleaveOut[0], 1) << 7) +
|
||||
(GET_BIT(mp1->interleaveOut[1], 1) << 6) +
|
||||
(GET_BIT(mp1->interleaveOut[3], 1) << 5) +
|
||||
(GET_BIT(mp1->interleaveOut[4], 1) << 4) +
|
||||
(GET_BIT(mp1->interleaveOut[6], 1) << 3) +
|
||||
(GET_BIT(mp1->interleaveOut[7], 1) << 2) +
|
||||
(GET_BIT(mp1->interleaveOut[9], 1) << 1) +
|
||||
(GET_BIT(mp1->interleaveOut[10],1));
|
||||
mp1WriteByte(mp1, a);
|
||||
|
||||
uint8_t b = (GET_BIT(mp1->interleaveOut[0], 2) << 7) +
|
||||
(GET_BIT(mp1->interleaveOut[1], 2) << 6) +
|
||||
(GET_BIT(mp1->interleaveOut[3], 2) << 5) +
|
||||
(GET_BIT(mp1->interleaveOut[4], 2) << 4) +
|
||||
(GET_BIT(mp1->interleaveOut[6], 2) << 3) +
|
||||
(GET_BIT(mp1->interleaveOut[7], 2) << 2) +
|
||||
(GET_BIT(mp1->interleaveOut[9], 2) << 1) +
|
||||
(GET_BIT(mp1->interleaveOut[10],2));
|
||||
mp1WriteByte(mp1, b);
|
||||
|
||||
uint8_t c = (GET_BIT(mp1->interleaveOut[0], 3) << 7) +
|
||||
(GET_BIT(mp1->interleaveOut[1], 3) << 6) +
|
||||
(GET_BIT(mp1->interleaveOut[3], 3) << 5) +
|
||||
(GET_BIT(mp1->interleaveOut[4], 3) << 4) +
|
||||
(GET_BIT(mp1->interleaveOut[6], 3) << 3) +
|
||||
(GET_BIT(mp1->interleaveOut[7], 3) << 2) +
|
||||
(GET_BIT(mp1->interleaveOut[9], 3) << 1) +
|
||||
(GET_BIT(mp1->interleaveOut[10],3));
|
||||
mp1WriteByte(mp1, c);
|
||||
|
||||
uint8_t d = (GET_BIT(mp1->interleaveOut[0], 4) << 7) +
|
||||
(GET_BIT(mp1->interleaveOut[1], 4) << 6) +
|
||||
(GET_BIT(mp1->interleaveOut[3], 4) << 5) +
|
||||
(GET_BIT(mp1->interleaveOut[4], 4) << 4) +
|
||||
(GET_BIT(mp1->interleaveOut[6], 4) << 3) +
|
||||
(GET_BIT(mp1->interleaveOut[7], 4) << 2) +
|
||||
(GET_BIT(mp1->interleaveOut[9], 4) << 1) +
|
||||
(GET_BIT(mp1->interleaveOut[10],4));
|
||||
mp1WriteByte(mp1, d);
|
||||
|
||||
uint8_t e = (GET_BIT(mp1->interleaveOut[0], 5) << 7) +
|
||||
(GET_BIT(mp1->interleaveOut[1], 5) << 6) +
|
||||
(GET_BIT(mp1->interleaveOut[3], 5) << 5) +
|
||||
(GET_BIT(mp1->interleaveOut[4], 5) << 4) +
|
||||
(GET_BIT(mp1->interleaveOut[6], 5) << 3) +
|
||||
(GET_BIT(mp1->interleaveOut[7], 5) << 2) +
|
||||
(GET_BIT(mp1->interleaveOut[9], 5) << 1) +
|
||||
(GET_BIT(mp1->interleaveOut[10],5));
|
||||
mp1WriteByte(mp1, e);
|
||||
|
||||
uint8_t f = (GET_BIT(mp1->interleaveOut[0], 6) << 7) +
|
||||
(GET_BIT(mp1->interleaveOut[1], 6) << 6) +
|
||||
(GET_BIT(mp1->interleaveOut[3], 6) << 5) +
|
||||
(GET_BIT(mp1->interleaveOut[4], 6) << 4) +
|
||||
(GET_BIT(mp1->interleaveOut[6], 6) << 3) +
|
||||
(GET_BIT(mp1->interleaveOut[7], 6) << 2) +
|
||||
(GET_BIT(mp1->interleaveOut[9], 6) << 1) +
|
||||
(GET_BIT(mp1->interleaveOut[10],6));
|
||||
mp1WriteByte(mp1, f);
|
||||
|
||||
uint8_t g = (GET_BIT(mp1->interleaveOut[0], 7) << 7) +
|
||||
(GET_BIT(mp1->interleaveOut[1], 7) << 6) +
|
||||
(GET_BIT(mp1->interleaveOut[3], 7) << 5) +
|
||||
(GET_BIT(mp1->interleaveOut[4], 7) << 4) +
|
||||
(GET_BIT(mp1->interleaveOut[6], 7) << 3) +
|
||||
(GET_BIT(mp1->interleaveOut[7], 7) << 2) +
|
||||
(GET_BIT(mp1->interleaveOut[9], 7) << 1) +
|
||||
(GET_BIT(mp1->interleaveOut[10],7));
|
||||
mp1WriteByte(mp1, g);
|
||||
|
||||
uint8_t h = (GET_BIT(mp1->interleaveOut[0], 8) << 7) +
|
||||
(GET_BIT(mp1->interleaveOut[1], 8) << 6) +
|
||||
(GET_BIT(mp1->interleaveOut[3], 8) << 5) +
|
||||
(GET_BIT(mp1->interleaveOut[4], 8) << 4) +
|
||||
(GET_BIT(mp1->interleaveOut[6], 8) << 3) +
|
||||
(GET_BIT(mp1->interleaveOut[7], 8) << 2) +
|
||||
(GET_BIT(mp1->interleaveOut[9], 8) << 1) +
|
||||
(GET_BIT(mp1->interleaveOut[10],8));
|
||||
mp1WriteByte(mp1, h);
|
||||
|
||||
uint8_t p = (GET_BIT(mp1->interleaveOut[2], 1) << 7) +
|
||||
(GET_BIT(mp1->interleaveOut[2], 5) << 6) +
|
||||
(GET_BIT(mp1->interleaveOut[5], 1) << 5) +
|
||||
(GET_BIT(mp1->interleaveOut[5], 5) << 4) +
|
||||
(GET_BIT(mp1->interleaveOut[8], 1) << 3) +
|
||||
(GET_BIT(mp1->interleaveOut[8], 5) << 2) +
|
||||
(GET_BIT(mp1->interleaveOut[11],1) << 1) +
|
||||
(GET_BIT(mp1->interleaveOut[11],5));
|
||||
mp1WriteByte(mp1, p);
|
||||
|
||||
uint8_t q = (GET_BIT(mp1->interleaveOut[2], 2) << 7) +
|
||||
(GET_BIT(mp1->interleaveOut[2], 6) << 6) +
|
||||
(GET_BIT(mp1->interleaveOut[5], 2) << 5) +
|
||||
(GET_BIT(mp1->interleaveOut[5], 6) << 4) +
|
||||
(GET_BIT(mp1->interleaveOut[8], 2) << 3) +
|
||||
(GET_BIT(mp1->interleaveOut[8], 6) << 2) +
|
||||
(GET_BIT(mp1->interleaveOut[11],2) << 1) +
|
||||
(GET_BIT(mp1->interleaveOut[11],6));
|
||||
mp1WriteByte(mp1, q);
|
||||
|
||||
uint8_t s = (GET_BIT(mp1->interleaveOut[2], 3) << 7) +
|
||||
(GET_BIT(mp1->interleaveOut[2], 7) << 6) +
|
||||
(GET_BIT(mp1->interleaveOut[5], 3) << 5) +
|
||||
(GET_BIT(mp1->interleaveOut[5], 7) << 4) +
|
||||
(GET_BIT(mp1->interleaveOut[8], 3) << 3) +
|
||||
(GET_BIT(mp1->interleaveOut[8], 7) << 2) +
|
||||
(GET_BIT(mp1->interleaveOut[11],3) << 1) +
|
||||
(GET_BIT(mp1->interleaveOut[11],7));
|
||||
mp1WriteByte(mp1, s);
|
||||
|
||||
uint8_t t = (GET_BIT(mp1->interleaveOut[2], 4) << 7) +
|
||||
(GET_BIT(mp1->interleaveOut[2], 8) << 6) +
|
||||
(GET_BIT(mp1->interleaveOut[5], 4) << 5) +
|
||||
(GET_BIT(mp1->interleaveOut[5], 8) << 4) +
|
||||
(GET_BIT(mp1->interleaveOut[8], 4) << 3) +
|
||||
(GET_BIT(mp1->interleaveOut[8], 8) << 2) +
|
||||
(GET_BIT(mp1->interleaveOut[11],4) << 1) +
|
||||
(GET_BIT(mp1->interleaveOut[11],8));
|
||||
mp1WriteByte(mp1, t);
|
||||
|
||||
#endif
|
||||
|
||||
mp1->interleaveCounter = 0;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
void mp1Deinterleave(MP1 *mp1) {
|
||||
#if MP1_INTERLEAVE_SIZE == 3
|
||||
uint8_t a = (GET_BIT(mp1->interleaveIn[0], 1) << 7) +
|
||||
(GET_BIT(mp1->interleaveIn[1], 2) << 6) +
|
||||
(GET_BIT(mp1->interleaveIn[2], 3) << 5) +
|
||||
(GET_BIT(mp1->interleaveIn[0], 4) << 4) +
|
||||
(GET_BIT(mp1->interleaveIn[1], 5) << 3) +
|
||||
(GET_BIT(mp1->interleaveIn[2], 6) << 2) +
|
||||
(GET_BIT(mp1->interleaveIn[0], 7) << 1) +
|
||||
(GET_BIT(mp1->interleaveIn[1], 8));
|
||||
|
||||
uint8_t b = (GET_BIT(mp1->interleaveIn[0], 2) << 7) +
|
||||
(GET_BIT(mp1->interleaveIn[1], 3) << 6) +
|
||||
(GET_BIT(mp1->interleaveIn[2], 4) << 5) +
|
||||
(GET_BIT(mp1->interleaveIn[0], 5) << 4) +
|
||||
(GET_BIT(mp1->interleaveIn[1], 6) << 3) +
|
||||
(GET_BIT(mp1->interleaveIn[2], 1) << 2) +
|
||||
(GET_BIT(mp1->interleaveIn[0], 8) << 1) +
|
||||
(GET_BIT(mp1->interleaveIn[2], 7));
|
||||
|
||||
uint8_t c = (GET_BIT(mp1->interleaveIn[0], 3) << 7) +
|
||||
(GET_BIT(mp1->interleaveIn[1], 1) << 6) +
|
||||
(GET_BIT(mp1->interleaveIn[2], 2) << 5) +
|
||||
(GET_BIT(mp1->interleaveIn[0], 6) << 4) +
|
||||
(GET_BIT(mp1->interleaveIn[1], 4) << 3) +
|
||||
(GET_BIT(mp1->interleaveIn[2], 5) << 2) +
|
||||
(GET_BIT(mp1->interleaveIn[1], 7) << 1) +
|
||||
(GET_BIT(mp1->interleaveIn[2], 8));
|
||||
|
||||
mp1->interleaveIn[0] = a;
|
||||
mp1->interleaveIn[1] = b;
|
||||
mp1->interleaveIn[2] = c;
|
||||
#elif MP1_INTERLEAVE_SIZE == 12
|
||||
uint8_t a = (GET_BIT(mp1->interleaveIn[0], 1) << 7) +
|
||||
(GET_BIT(mp1->interleaveIn[1], 1) << 6) +
|
||||
(GET_BIT(mp1->interleaveIn[2], 1) << 5) +
|
||||
(GET_BIT(mp1->interleaveIn[3], 1) << 4) +
|
||||
(GET_BIT(mp1->interleaveIn[4], 1) << 3) +
|
||||
(GET_BIT(mp1->interleaveIn[5], 1) << 2) +
|
||||
(GET_BIT(mp1->interleaveIn[6], 1) << 1) +
|
||||
(GET_BIT(mp1->interleaveIn[7], 1));
|
||||
|
||||
uint8_t b = (GET_BIT(mp1->interleaveIn[0], 2) << 7) +
|
||||
(GET_BIT(mp1->interleaveIn[1], 2) << 6) +
|
||||
(GET_BIT(mp1->interleaveIn[2], 2) << 5) +
|
||||
(GET_BIT(mp1->interleaveIn[3], 2) << 4) +
|
||||
(GET_BIT(mp1->interleaveIn[4], 2) << 3) +
|
||||
(GET_BIT(mp1->interleaveIn[5], 2) << 2) +
|
||||
(GET_BIT(mp1->interleaveIn[6], 2) << 1) +
|
||||
(GET_BIT(mp1->interleaveIn[7], 2));
|
||||
|
||||
uint8_t p = (GET_BIT(mp1->interleaveIn[8], 1) << 7) +
|
||||
(GET_BIT(mp1->interleaveIn[9], 1) << 6) +
|
||||
(GET_BIT(mp1->interleaveIn[10],1) << 5) +
|
||||
(GET_BIT(mp1->interleaveIn[11],1) << 4) +
|
||||
(GET_BIT(mp1->interleaveIn[8], 2) << 3) +
|
||||
(GET_BIT(mp1->interleaveIn[9], 2) << 2) +
|
||||
(GET_BIT(mp1->interleaveIn[10],2) << 1) +
|
||||
(GET_BIT(mp1->interleaveIn[11],2));
|
||||
|
||||
uint8_t c = (GET_BIT(mp1->interleaveIn[0], 3) << 7) +
|
||||
(GET_BIT(mp1->interleaveIn[1], 3) << 6) +
|
||||
(GET_BIT(mp1->interleaveIn[2], 3) << 5) +
|
||||
(GET_BIT(mp1->interleaveIn[3], 3) << 4) +
|
||||
(GET_BIT(mp1->interleaveIn[4], 3) << 3) +
|
||||
(GET_BIT(mp1->interleaveIn[5], 3) << 2) +
|
||||
(GET_BIT(mp1->interleaveIn[6], 3) << 1) +
|
||||
(GET_BIT(mp1->interleaveIn[7], 3));
|
||||
|
||||
uint8_t d = (GET_BIT(mp1->interleaveIn[0], 4) << 7) +
|
||||
(GET_BIT(mp1->interleaveIn[1], 4) << 6) +
|
||||
(GET_BIT(mp1->interleaveIn[2], 4) << 5) +
|
||||
(GET_BIT(mp1->interleaveIn[3], 4) << 4) +
|
||||
(GET_BIT(mp1->interleaveIn[4], 4) << 3) +
|
||||
(GET_BIT(mp1->interleaveIn[5], 4) << 2) +
|
||||
(GET_BIT(mp1->interleaveIn[6], 4) << 1) +
|
||||
(GET_BIT(mp1->interleaveIn[7], 4));
|
||||
|
||||
uint8_t q = (GET_BIT(mp1->interleaveIn[8], 3) << 7) +
|
||||
(GET_BIT(mp1->interleaveIn[9], 3) << 6) +
|
||||
(GET_BIT(mp1->interleaveIn[10],3) << 5) +
|
||||
(GET_BIT(mp1->interleaveIn[11],3) << 4) +
|
||||
(GET_BIT(mp1->interleaveIn[8], 4) << 3) +
|
||||
(GET_BIT(mp1->interleaveIn[9], 4) << 2) +
|
||||
(GET_BIT(mp1->interleaveIn[10],4) << 1) +
|
||||
(GET_BIT(mp1->interleaveIn[11],4));
|
||||
|
||||
uint8_t e = (GET_BIT(mp1->interleaveIn[0], 5) << 7) +
|
||||
(GET_BIT(mp1->interleaveIn[1], 5) << 6) +
|
||||
(GET_BIT(mp1->interleaveIn[2], 5) << 5) +
|
||||
(GET_BIT(mp1->interleaveIn[3], 5) << 4) +
|
||||
(GET_BIT(mp1->interleaveIn[4], 5) << 3) +
|
||||
(GET_BIT(mp1->interleaveIn[5], 5) << 2) +
|
||||
(GET_BIT(mp1->interleaveIn[6], 5) << 1) +
|
||||
(GET_BIT(mp1->interleaveIn[7], 5));
|
||||
|
||||
uint8_t f = (GET_BIT(mp1->interleaveIn[0], 6) << 7) +
|
||||
(GET_BIT(mp1->interleaveIn[1], 6) << 6) +
|
||||
(GET_BIT(mp1->interleaveIn[2], 6) << 5) +
|
||||
(GET_BIT(mp1->interleaveIn[3], 6) << 4) +
|
||||
(GET_BIT(mp1->interleaveIn[4], 6) << 3) +
|
||||
(GET_BIT(mp1->interleaveIn[5], 6) << 2) +
|
||||
(GET_BIT(mp1->interleaveIn[6], 6) << 1) +
|
||||
(GET_BIT(mp1->interleaveIn[7], 6));
|
||||
|
||||
uint8_t s = (GET_BIT(mp1->interleaveIn[8], 5) << 7) +
|
||||
(GET_BIT(mp1->interleaveIn[9], 5) << 6) +
|
||||
(GET_BIT(mp1->interleaveIn[10],5) << 5) +
|
||||
(GET_BIT(mp1->interleaveIn[11],5) << 4) +
|
||||
(GET_BIT(mp1->interleaveIn[8], 6) << 3) +
|
||||
(GET_BIT(mp1->interleaveIn[9], 6) << 2) +
|
||||
(GET_BIT(mp1->interleaveIn[10],6) << 1) +
|
||||
(GET_BIT(mp1->interleaveIn[11],6));
|
||||
|
||||
uint8_t g = (GET_BIT(mp1->interleaveIn[0], 7) << 7) +
|
||||
(GET_BIT(mp1->interleaveIn[1], 7) << 6) +
|
||||
(GET_BIT(mp1->interleaveIn[2], 7) << 5) +
|
||||
(GET_BIT(mp1->interleaveIn[3], 7) << 4) +
|
||||
(GET_BIT(mp1->interleaveIn[4], 7) << 3) +
|
||||
(GET_BIT(mp1->interleaveIn[5], 7) << 2) +
|
||||
(GET_BIT(mp1->interleaveIn[6], 7) << 1) +
|
||||
(GET_BIT(mp1->interleaveIn[7], 7));
|
||||
|
||||
uint8_t h = (GET_BIT(mp1->interleaveIn[0], 8) << 7) +
|
||||
(GET_BIT(mp1->interleaveIn[1], 8) << 6) +
|
||||
(GET_BIT(mp1->interleaveIn[2], 8) << 5) +
|
||||
(GET_BIT(mp1->interleaveIn[3], 8) << 4) +
|
||||
(GET_BIT(mp1->interleaveIn[4], 8) << 3) +
|
||||
(GET_BIT(mp1->interleaveIn[5], 8) << 2) +
|
||||
(GET_BIT(mp1->interleaveIn[6], 8) << 1) +
|
||||
(GET_BIT(mp1->interleaveIn[7], 8));
|
||||
|
||||
uint8_t t = (GET_BIT(mp1->interleaveIn[8], 7) << 7) +
|
||||
(GET_BIT(mp1->interleaveIn[9], 7) << 6) +
|
||||
(GET_BIT(mp1->interleaveIn[10],7) << 5) +
|
||||
(GET_BIT(mp1->interleaveIn[11],7) << 4) +
|
||||
(GET_BIT(mp1->interleaveIn[8], 8) << 3) +
|
||||
(GET_BIT(mp1->interleaveIn[9], 8) << 2) +
|
||||
(GET_BIT(mp1->interleaveIn[10],8) << 1) +
|
||||
(GET_BIT(mp1->interleaveIn[11],8));
|
||||
|
||||
mp1->interleaveIn[0] = a;
|
||||
mp1->interleaveIn[1] = b;
|
||||
mp1->interleaveIn[2] = p;
|
||||
mp1->interleaveIn[3] = c;
|
||||
mp1->interleaveIn[4] = d;
|
||||
mp1->interleaveIn[5] = q;
|
||||
mp1->interleaveIn[6] = e;
|
||||
mp1->interleaveIn[7] = f;
|
||||
mp1->interleaveIn[8] = s;
|
||||
mp1->interleaveIn[9] = g;
|
||||
mp1->interleaveIn[10] = h;
|
||||
mp1->interleaveIn[11] = t;
|
||||
|
||||
#endif
|
||||
}
|
||||
|
|
@ -5,9 +5,10 @@
|
|||
#include <io/kfile.h>
|
||||
|
||||
// Frame sizing & checksum
|
||||
#define MP1_MIN_FRAME_LENGTH 3
|
||||
#define MP1_INTERLEAVE_SIZE 12
|
||||
#define MP1_MIN_FRAME_LENGTH MP1_INTERLEAVE_SIZE
|
||||
#define MP1_DATA_BLOCK_SIZE ((MP1_INTERLEAVE_SIZE/3)*2)
|
||||
#define MP1_MAX_FRAME_LENGTH 250
|
||||
#define MP1_INTERLEAVE_SIZE 3
|
||||
#define MP1_CHECKSUM_INIT 0xAA
|
||||
|
||||
// We need to know some basic HDLC flag bytes
|
||||
|
|
@ -33,7 +34,7 @@ typedef void (*mp1_callback_t)(struct MP1Packet *packet);
|
|||
// Struct for a protocol context
|
||||
typedef struct MP1 {
|
||||
uint8_t buffer[MP1_MAX_FRAME_LENGTH]; // A buffer for incoming packets
|
||||
uint8_t fecBuffer[3]; // FEC buffer
|
||||
uint8_t fecBuffer[3]; // Forward Error Correction buffer
|
||||
KFile *modem; // KFile access to the modem
|
||||
size_t packetLength; // Counter for received packet length
|
||||
size_t readLength; // This is the full read length, including parity bytes
|
||||
|
|
|
|||
|
|
@ -1,2 +1,2 @@
|
|||
#define VERS_BUILD 1323
|
||||
#define VERS_BUILD 1373
|
||||
#define VERS_HOST "vixen"
|
||||
|
|
|
|||
Loading…
Reference in New Issue