60 lines
2.3 KiB
C
60 lines
2.3 KiB
C
//////////////////////////////////////////////////////
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// First things first, all the includes we need //
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//////////////////////////////////////////////////////
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#ifndef FSK_MODEM_HW
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#define FSK_MODEM_HW
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#include "cfg/cfg_arch.h" // Architecture configuration
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#include <avr/io.h> // AVR IO functions from BertOS
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//////////////////////////////////////////////////////
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// Definitions and some useful macros //
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//////////////////////////////////////////////////////
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// Forward declaration of our modem "object"
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struct Afsk;
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// Function declarations
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void hw_afsk_adcInit(int ch, struct Afsk *_ctx);
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void hw_afsk_dacInit(int ch, struct Afsk *_ctx);
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// Here's some macros for controlling the RX/TX LEDs
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// THE _INIT() functions writes to the DDRB register
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// to configure the pins as output pins, and the _ON()
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// and _OFF() functions writes to the PORT registers
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// to turn the pins on or off.
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#define LED_TX_INIT() do { DDRB |= BV(1); } while (0)
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#define LED_TX_ON() do { PORTB |= BV(1); } while (0)
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#define LED_TX_OFF() do { PORTB &= ~BV(1); } while (0)
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#define LED_RX_INIT() do { DDRB |= BV(2); } while (0)
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#define LED_RX_ON() do { PORTB |= BV(2); } while (0)
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#define LED_RX_OFF() do { PORTB &= ~BV(2); } while (0)
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// A shorthand macro for initializing the ADC.
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// It just calls the actual ADC initialization code
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// in "hardware.c"
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#define AFSK_ADC_INIT(ch, ctx) hw_afsk_adcInit(ch, ctx)
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// Initialization of the DAC pins. The DDRD register
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// configures pins 0 through 7 for input or output.
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// DDR stands for Data Direction Register. By setting
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// it to 0xF8 we set 11111000, which means the pins
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// 3, 4, 5, 6 and 7 will be set to output.
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#define AFSK_DAC_INIT() do { DDRD |= 0xF8; } while (0)
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// These two macros start and stop the DAC routine
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// being called in our timer interrupt. For starting
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// it, we set a boolean flag to true, and false for
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// stopping it. We also turn on and off pin 3 to trigger
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// the PTT of the radio.
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#define AFSK_DAC_IRQ_START() do { extern bool hw_afsk_dac_isr; PORTD |= BV(3); hw_afsk_dac_isr = true; } while (0)
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#define AFSK_DAC_IRQ_STOP() do { extern bool hw_afsk_dac_isr; PORTD &= ~BV(3); hw_afsk_dac_isr = false; } while (0)
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#define AFSK_HW_PTT_ON() do { extern bool hw_ptt_on; hw_ptt_on = true; } while (0)
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#define AFSK_HW_PTT_OFF() do { extern bool hw_ptt_on; hw_ptt_on = false; } while (0)
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#endif
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