Added BME280 driver

Makefile

@@ -6,7 +6,7 @@ TARGET = images/OpenModem
 OPT = s
 FORMAT = ihex
 
-SRC = main.c util/Config.c hardware/Serial.c hardware/AFSK.c hardware/VREF.c hardware/LED.c hardware/UserIO.c hardware/SD.c hardware/sdcard/diskio.c hardware/sdcard/ff.c hardware/sdcard/ffsystem.c hardware/sdcard/ffunicode.c hardware/Bluetooth.c hardware/GPS.c hardware/Crypto.c hardware/crypto/AES.c hardware/crypto/HMAC_MD5.c hardware/crypto/MD5.c hardware/crypto/MD5_sbox.c util/CRC-CCIT.c protocol/AX25.c protocol/KISS.c
+SRC = main.c util/Config.c hardware/Serial.c hardware/AFSK.c hardware/VREF.c hardware/LED.c hardware/UserIO.c hardware/SD.c hardware/sdcard/diskio.c hardware/sdcard/ff.c hardware/sdcard/ffsystem.c hardware/sdcard/ffunicode.c hardware/Bluetooth.c hardware/BME280.c hardware/GPS.c hardware/Crypto.c hardware/crypto/AES.c hardware/crypto/HMAC_MD5.c hardware/crypto/MD5.c hardware/crypto/MD5_sbox.c util/CRC-CCIT.c protocol/AX25.c protocol/KISS.c
 
 # TODO: Try hardware/crypto/MD5_asm.S
 # List Assembler source files here.

device.h

@@ -56,6 +56,14 @@
 // Packet settings
 #define CONFIG_PASSALL false
 
+// User jobs
+#define CONFIG_USER_JOBS_ENABLED true
+
+// External sensor support
+#define CONFIG_SENSORS_ENABLED true
+#define CONFIG_SENSORS_INTERVAL_MS 1000
+#define CONFIG_BME280_ENABLED true
+
 // Port settings
 #if TARGET_CPU == m1284p
     #define ADC_PORT  	PORTA
@@ -118,4 +126,8 @@
 #define PATH_AES_128_KEY "OpenModem/aes128.key"
 #define PATH_CRYPTO_DISABLE "OpenModem/aes128.disable"
 
+// User-scriptable forward function declarations
+void user_init(void);
+void user_jobs(void);
+
 #endif

hardware/BME280.c

@@ -0,0 +1,295 @@
+#include "BME280.h"
+#include "hardware/LED.h"
+#include "util/time.h"
+#include "util/Config.h"
+
+void bme280_cs(bool val) {
+	if (!val) {
+		// Pull CS line low to enable bus
+		USR_IO_PORT &= ~(_BV(bme280_cs_usrio_pin));
+	} else {
+		// Set CS line to high to disable bus
+		USR_IO_PORT |= _BV(bme280_cs_usrio_pin);
+	}
+}
+
+uint8_t bme280_exchange(uint8_t tx) {
+	SPDR = tx;
+	while(!(SPSR & (1<<SPIF)));
+	return SPDR;
+}
+
+void bme280_deselect(void) {
+	bme280_cs(true);
+}
+
+void bme280_select(void) {
+	bme280_cs(false);
+}
+
+void bme280_exchange_multi(const uint8_t *buf, size_t len) {
+	do {
+		SPDR = *buf++; while(!(SPSR & (1<<SPIF)));
+		SPDR = *buf++; while(!(SPSR & (1<<SPIF)));
+	} while (len -= 2);
+}
+
+void bme280_receive_multi(uint8_t *buf, size_t len) {
+	do {
+		SPDR = 0xFF; loop_until_bit_is_set(SPSR,SPIF); *buf++ = SPDR;
+		SPDR = 0xFF; loop_until_bit_is_set(SPSR,SPIF); *buf++ = SPDR;
+	} while (len -= 2);
+}
+
+void bme280_write8(uint8_t reg_addr, uint8_t value) {
+	bme280_select();
+	bme280_exchange(reg_addr & ~0x80); // Write mode
+	bme280_exchange(value);
+	bme280_deselect();
+}
+
+uint8_t bme280_read8(uint8_t reg_addr) {
+	bme280_select();
+	bme280_exchange(reg_addr | 0x80); // Read mode
+	uint8_t value = bme280_exchange(0x00);
+	bme280_deselect();
+	return value;
+}
+
+uint16_t bme280_read16(uint8_t reg_addr) {
+	bme280_select();
+	bme280_exchange(reg_addr | 0x80);
+	uint16_t value = (bme280_exchange(0x00) << 8) | bme280_exchange(0x00);
+	bme280_deselect();
+	return value;
+}
+
+uint16_t bme280_read16_le(uint8_t reg_addr) {
+	uint16_t value = bme280_read16(reg_addr);
+	return (value >> 8) | (value << 8);
+}
+
+int16_t bme280_read16_s(uint8_t reg_addr) {
+	return (int16_t)bme280_read16(reg_addr);
+}
+
+int16_t bme280_read16_s_le(uint8_t reg_addr) {
+	return (int16_t)bme280_read16_le(reg_addr);
+}
+
+uint32_t bme280_read24(uint8_t reg_addr) {
+	uint32_t value;
+
+	bme280_select();
+	bme280_exchange(reg_addr | 0x80); // Bit 7 high for read mode
+
+	value = bme280_exchange(0x00);
+	value = value << 8;
+	value |= bme280_exchange(0x00);
+	value = value << 8;
+	value |= bme280_exchange(0x00);
+
+	bme280_deselect();
+	return value;
+}
+
+bool bme280_reading_calibration(void) {
+	uint8_t const status = bme280_read8(BME280_REGISTER_STATUS);
+	return (status & (1 << 0)) != 0;
+}
+
+void bme280_read_coefficients(void) {
+	bme280_calibration.dig_T1 = bme280_read16_le(BME280_REGISTER_DIG_T1);
+	bme280_calibration.dig_T2 = bme280_read16_s_le(BME280_REGISTER_DIG_T2);
+	bme280_calibration.dig_T3 = bme280_read16_s_le(BME280_REGISTER_DIG_T3);
+
+	bme280_calibration.dig_P1 = bme280_read16_le(BME280_REGISTER_DIG_P1);
+	bme280_calibration.dig_P2 = bme280_read16_s_le(BME280_REGISTER_DIG_P2);
+	bme280_calibration.dig_P3 = bme280_read16_s_le(BME280_REGISTER_DIG_P3);
+	bme280_calibration.dig_P4 = bme280_read16_s_le(BME280_REGISTER_DIG_P4);
+	bme280_calibration.dig_P5 = bme280_read16_s_le(BME280_REGISTER_DIG_P5);
+	bme280_calibration.dig_P6 = bme280_read16_s_le(BME280_REGISTER_DIG_P6);
+	bme280_calibration.dig_P7 = bme280_read16_s_le(BME280_REGISTER_DIG_P7);
+	bme280_calibration.dig_P8 = bme280_read16_s_le(BME280_REGISTER_DIG_P8);
+	bme280_calibration.dig_P9 = bme280_read16_s_le(BME280_REGISTER_DIG_P9);
+
+	bme280_calibration.dig_H1 = bme280_read8(BME280_REGISTER_DIG_H1);
+	bme280_calibration.dig_H2 = bme280_read16_s_le(BME280_REGISTER_DIG_H2);
+	bme280_calibration.dig_H3 = bme280_read8(BME280_REGISTER_DIG_H3);
+
+	bme280_calibration.dig_H4 = ((int8_t)bme280_read8(BME280_REGISTER_DIG_H4) << 4) |
+		                        (bme280_read8(BME280_REGISTER_DIG_H4 + 1) & 0xF);
+
+	bme280_calibration.dig_H5 = ((int8_t)bme280_read8(BME280_REGISTER_DIG_H5 + 1) << 4) |
+                                (bme280_read8(BME280_REGISTER_DIG_H5) >> 4);
+
+    bme280_calibration.dig_H6 = bme280_read8(BME280_REGISTER_DIG_H6);
+}
+
+
+void bme280_set_sampling(void) {
+	uint8_t humidity_control_reg_values = BME280_SAMPLING_X16;
+	uint8_t config_reg_values = BME280_STANDBY_MS_0_5 << 5 | BME280_FILTER_OFF << 2;
+	uint8_t control_reg_values = BME280_SAMPLING_X16 << 5 | BME280_SAMPLING_X16 << 2 | BME280_MODE_NORMAL;
+
+	bme280_write8(BME280_REGISTER_CONTROLHUMID, humidity_control_reg_values);
+	bme280_write8(BME280_REGISTER_CONFIG, config_reg_values);
+	bme280_write8(BME280_REGISTER_CONTROL, control_reg_values);
+
+}
+
+bool bme280_read_temperature(void) {
+	int32_t var1, var2;
+	int32_t adc_temp = bme280_read24(BME280_REGISTER_TEMPDATA);
+	if (adc_temp == 0x800000) {
+		bme280_temperature = BME280_TEMP_UNDEFINED;
+		return false;
+	} else {
+		adc_temp >>= 4;
+
+		var1 = ((((adc_temp >> 3) - ((int32_t)bme280_calibration.dig_T1 << 1))) *
+          ((int32_t)bme280_calibration.dig_T2)) >>
+         11;
+
+        var2 = (((((adc_temp >> 4) - ((int32_t)bme280_calibration.dig_T1)) *
+            ((adc_temp >> 4) - ((int32_t)bme280_calibration.dig_T1))) >>
+           12) *
+          ((int32_t)bme280_calibration.dig_T3)) >>
+         14;
+
+        bme280_temperature_fine = var1 + var2 + bme280_temperature_fine_adjust;
+
+        float temperature = (bme280_temperature_fine * 5 + 128) >> 8;
+        bme280_temperature = temperature / 100;
+
+        return true;
+	}
+
+}
+
+bool bme280_read_pressure(void) {
+	int64_t var1, var2, p;
+
+	bme280_read_temperature();
+	int32_t adc_P = bme280_read24(BME280_REGISTER_PRESSUREDATA);
+
+	if (adc_P == 0x800000) {
+		bme280_pressure = BME280_PRESSURE_UNDEFINED;
+		return false;
+	}
+
+	adc_P >>= 4;
+
+	var1 = ((int64_t)bme280_temperature_fine) - 128000;
+	var2 = var1 * var1 * (int64_t)bme280_calibration.dig_P6;
+	var2 = var2 + ((var1 * (int64_t)bme280_calibration.dig_P5) << 17);
+	var2 = var2 + (((int64_t)bme280_calibration.dig_P4) << 35);
+	var1 = ((var1 * var1 * (int64_t)bme280_calibration.dig_P3) >> 8) +
+	       ((var1 * (int64_t)bme280_calibration.dig_P2) << 12);
+	var1 =
+	    (((((int64_t)1) << 47) + var1)) * ((int64_t)bme280_calibration.dig_P1) >> 33;
+
+	if (var1 == 0) {
+	  return false;
+	}
+
+	p = 1048576 - adc_P;
+	p = (((p << 31) - var2) * 3125) / var1;
+	var1 = (((int64_t)bme280_calibration.dig_P9) * (p >> 13) * (p >> 13)) >> 25;
+	var2 = (((int64_t)bme280_calibration.dig_P8) * p) >> 19;
+
+	p = ((p + var1 + var2) >> 8) + (((int64_t)bme280_calibration.dig_P7) << 4);
+
+	bme280_pressure = (float)p / 25600;
+	return true;
+}
+
+bool bme280_read_humidity(void) {
+	int32_t v_x1_u32r;
+
+	bme280_read_temperature();
+
+	int32_t adc_H = bme280_read16(BME280_REGISTER_HUMIDDATA);
+
+	if (adc_H == 0x800000) {
+		bme280_humidity = BME280_PRESSURE_UNDEFINED;
+		return false;
+	}
+
+	v_x1_u32r = (bme280_temperature_fine - ((int32_t)76800));
+
+	v_x1_u32r = (((((adc_H << 14) - (((int32_t)bme280_calibration.dig_H4) << 20) -
+	                (((int32_t)bme280_calibration.dig_H5) * v_x1_u32r)) +
+	               ((int32_t)16384)) >>
+	              15) *
+	             (((((((v_x1_u32r * ((int32_t)bme280_calibration.dig_H6)) >> 10) *
+	                  (((v_x1_u32r * ((int32_t)bme280_calibration.dig_H3)) >> 11) +
+	                   ((int32_t)32768))) >>
+	                 10) +
+	                ((int32_t)2097152)) *
+	                   ((int32_t)bme280_calibration.dig_H2) +
+	               8192) >>
+	              14));
+
+	v_x1_u32r = (v_x1_u32r - (((((v_x1_u32r >> 15) * (v_x1_u32r >> 15)) >> 7) *
+	                           ((int32_t)bme280_calibration.dig_H1)) >>
+	                          4));
+
+	v_x1_u32r = (v_x1_u32r < 0) ? 0 : v_x1_u32r;
+	v_x1_u32r = (v_x1_u32r > 419430400) ? 419430400 : v_x1_u32r;
+	float h = (v_x1_u32r >> 12);
+	bme280_humidity = h / 1024.0;
+	
+	return true;
+}
+
+bool bme280_init(uint8_t cs_usrio_pin) {
+	bme280_installed = false;
+	bme280_ready = false;
+	bme280_cs_usrio_pin = cs_usrio_pin;
+
+	bme280_temperature_fine_adjust = BME280_TEMPERATURE_ADJUSTMENT;
+
+	USR_IO_DDR |= bme280_cs_usrio_pin;
+
+	SPI_DDR |= _BV(SPI_MOSI) | _BV(SPI_CLK);
+    SPI_DDR &= ~(_BV(SPI_MISO));
+    SPCR = (1<<SPE) | (1<<MSTR) | (1<<SPR0);
+
+    bme280_deselect();
+    uint8_t sensor_id = bme280_read8(BME280_REGISTER_CHIPID);
+    if (sensor_id == 0x60) {
+    	bme280_installed = true;
+
+    	// Soft-reset chip to clear settings
+    	bme280_write8(BME280_REGISTER_SOFTRESET, 0xB6);
+    	delay_ms(10);
+
+    	// Wait for chip to read calibration data
+    	while (bme280_reading_calibration()) {
+    		delay_ms(10);
+    	}
+
+    	// Load calibration coefficients
+    	bme280_read_coefficients();
+
+    	// Set sampling configuration
+    	bme280_set_sampling();
+    	delay_ms(100);
+
+    	bme280_ready = true;
+    	return true;
+    } else {
+    	bme280_installed = false;
+    	bme280_ready = false;
+    	return false;
+    }
+}
+
+bool bme280_poll(void) {
+	if (bme280_read_temperature() && bme280_read_pressure() && bme280_read_humidity()) {
+		return true;
+	} else {
+		return false;
+	}
+}

hardware/BME280.h

@@ -0,0 +1,113 @@
+#ifndef bme280_H
+#define bme280_H
+
+#include <avr/io.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include "device.h"
+#include "util/time.h"
+
+#define BME280_TEMPERATURE_ADJUSTMENT 0
+
+#define BME280_TEMP_UNDEFINED -274
+#define BME280_PRESSURE_UNDEFINED -1
+#define BME280_HUMIDITY_UNDEFINED -1
+
+#define BME280_REGISTER_DIG_T1 0x88
+#define BME280_REGISTER_DIG_T2 0x8A
+#define BME280_REGISTER_DIG_T3 0x8C
+#define BME280_REGISTER_DIG_P1 0x8E
+#define BME280_REGISTER_DIG_P2 0x90
+#define BME280_REGISTER_DIG_P3 0x92
+#define BME280_REGISTER_DIG_P4 0x94
+#define BME280_REGISTER_DIG_P5 0x96
+#define BME280_REGISTER_DIG_P6 0x98
+#define BME280_REGISTER_DIG_P7 0x9A
+#define BME280_REGISTER_DIG_P8 0x9C
+#define BME280_REGISTER_DIG_P9 0x9E
+#define BME280_REGISTER_DIG_H1 0xA1
+#define BME280_REGISTER_DIG_H2 0xE1
+#define BME280_REGISTER_DIG_H3 0xE3
+#define BME280_REGISTER_DIG_H4 0xE4
+#define BME280_REGISTER_DIG_H5 0xE5
+#define BME280_REGISTER_DIG_H6 0xE7
+#define BME280_REGISTER_CHIPID 0xD0
+#define BME280_REGISTER_VERSION 0xD1
+#define BME280_REGISTER_SOFTRESET 0xE0
+#define BME280_REGISTER_CAL26 0xE1 // R calibration stored in 0xE1-0xF0
+#define BME280_REGISTER_CONTROLHUMID 0xF2
+#define BME280_REGISTER_STATUS 0XF3
+#define BME280_REGISTER_CONTROL 0xF4
+#define BME280_REGISTER_CONFIG 0xF5
+#define BME280_REGISTER_PRESSUREDATA 0xF7
+#define BME280_REGISTER_TEMPDATA 0xFA
+#define BME280_REGISTER_HUMIDDATA 0xFD
+
+#define BME280_SAMPLING_NONE 0b000
+#define BME280_SAMPLING_X1 0b001
+#define BME280_SAMPLING_X2 0b010
+#define BME280_SAMPLING_X4 0b011
+#define BME280_SAMPLING_X8 0b100
+#define BME280_SAMPLING_X16 0b101
+
+#define BME280_MODE_SLEEP 0b00
+#define BME280_MODE_FORCED 0b01
+#define BME280_MODE_NORMAL 0b11
+
+#define BME280_FILTER_OFF 0b000
+#define BME280_FILTER_X2 0b001
+#define BME280_FILTER_X4 0b010
+#define BME280_FILTER_X8 0b011
+#define BME280_FILTER_X16 0b100
+
+#define BME280_STANDBY_MS_0_5 0b000
+#define BME280_STANDBY_MS_10 0b110
+#define BME280_STANDBY_MS_20 0b111
+#define BME280_STANDBY_MS_62_5 0b001
+#define BME280_STANDBY_MS_125 0b010
+#define BME280_STANDBY_MS_250 0b011
+#define BME280_STANDBY_MS_500 0b100
+#define BME280_STANDBY_MS_1000 0b101
+
+
+typedef struct {
+  uint16_t dig_T1; // temperature compensation value
+  int16_t dig_T2;  // temperature compensation value
+  int16_t dig_T3;  // temperature compensation value
+
+  uint16_t dig_P1; // pressure compensation value
+  int16_t dig_P2;  // pressure compensation value
+  int16_t dig_P3;  // pressure compensation value
+  int16_t dig_P4;  // pressure compensation value
+  int16_t dig_P5;  // pressure compensation value
+  int16_t dig_P6;  // pressure compensation value
+  int16_t dig_P7;  // pressure compensation value
+  int16_t dig_P8;  // pressure compensation value
+  int16_t dig_P9;  // pressure compensation value
+
+  uint8_t dig_H1;  // humidity compensation value
+  int16_t dig_H2;  // humidity compensation value
+  uint8_t dig_H3;  // humidity compensation value
+  int16_t dig_H4;  // humidity compensation value
+  int16_t dig_H5;  // humidity compensation value
+  int8_t dig_H6;   // humidity compensation value
+} bme280_calib_data;
+
+bool bme280_init(uint8_t cs_usrio_pin);
+bool bme280_poll(void);
+
+bool bme280_installed;
+bool bme280_ready;
+uint8_t bme280_cs_usrio_pin;
+
+int32_t bme280_temperature_fine_adjust;
+int32_t bme280_temperature_fine;
+
+float bme280_temperature;
+float bme280_pressure;
+float bme280_humidity;
+
+bme280_calib_data bme280_calibration;
+
+#endif

hardware/GPS.c

@@ -274,21 +274,7 @@ void gps_nmea_parse(uint8_t sentence_length) {
 							gps_t_year    = (nmea_date % 100);
 							gps_update_rtc();
 						}
-
+						
-						// TODO: Remove this
-						// printf("GPS fix\r\n");
-						// printf("GPS satellites: %d\r\n", gps_sats);
-						// printf("GPS latitude: %d\" %d' %.2fs %c\r\n", gps_lat_degrees, gps_lat_minutes, gps_lat_seconds, gps_lat_sign);
-						// printf("GPS longtitude: %d\" %d' %.2fs %c\r\n", gps_lon_degrees, gps_lon_minutes, gps_lon_seconds, gps_lon_sign);
-						// printf("GPS coords: %.6f,%.6f\r\n", gps_lat, gps_lon);
-						// printf("GPS speed %.2f Km/h\r\n", gps_speed_kmh);
-						// printf("GPS speed %.2f knots\r\n", gps_speed_knots);
-						// printf("GPS bearing %.2f\r\n", gps_bearing);
-						// printf("GPS height above MSL: %.2f\r\n", gps_height_above_msl);
-						// printf("GPS altitude: %.2f\r\n", gps_altitude);
-						// printf("GPS geoid height: %.2f\r\n", gps_geoid_height);
-						// printf("GPS HDOP: %.2f\r\n", gps_hdop);
-						// printf("GPS time %d/%d/%d %d:%d:%d UTC\r\n", gps_t_year, gps_t_month, gps_t_day, gps_t_hour, gps_t_minute, gps_t_second);
 					} else {
 						gps_speed_knots = 0;
 						gps_speed_kmh = 0;

main.c

@@ -16,6 +16,7 @@
 #include "hardware/SD.h"
 #include "hardware/Crypto.h"
 #include "hardware/Bluetooth.h"
+#include "hardware/BME280.h"
 #include "hardware/GPS.h"
 #include "protocol/AX25.h"
 #include "protocol/KISS.h"
@@ -92,7 +93,33 @@ void init(void) {
     gps_init(&serial);
     usrio_init();
 
+    if (config_sensors_enabled) {
+        if (config_sensor_bme280_enabled) bme280_init(config_sensor_bme280_cs_pin);
+    }
+
     system_check();
+
+    if (config_user_jobs_enabled) user_init();
+}
+
+mtime_t sensor_poll_time = 0;
+void sensor_jobs(void) {
+    if (rtc_milliseconds() > sensor_poll_time+config_sensor_interval_ms) {
+        if (config_sensor_bme280_enabled && bme280_ready) {
+            bme280_poll();
+        }
+
+        sensor_poll_time = rtc_milliseconds();
+    }
+}
+
+void user_init(void) {
+    // Place user-specified initialisation code here
+}
+
+
+void user_jobs(void) {
+    // Place user-specified tasks and jobs here
 }
 
 
@@ -105,6 +132,9 @@ int main (void) {
         kiss_csma();
         sd_jobs();
         gps_poll();
+
+        if (config_sensors_enabled) sensor_jobs();
+        if (config_user_jobs_enabled) user_jobs();
     }
 
     return(0);

util/Config.c

@@ -30,7 +30,12 @@ void config_init(void) {
 }
 
 void config_init_ephemeral(void) {
+	config_user_jobs_enabled = CONFIG_USER_JOBS_ENABLED;
 	config_gps_nmea_output = CONFIG_GPS_NMEA_NONE;
+	config_sensors_enabled = CONFIG_SENSORS_ENABLED;
+	config_sensor_interval_ms = CONFIG_SENSORS_INTERVAL_MS;
+	config_sensor_bme280_enabled = CONFIG_BME280_ENABLED;
+	config_sensor_bme280_cs_pin = USR_IO_1;
 }
 
 void config_apply(void) {

util/Config.h

@@ -74,8 +74,14 @@ uint8_t config_gps_nmea_output;
 uint8_t config_bluetooth_mode;
 uint8_t config_serial_baudrate;
 
+bool config_user_jobs_enabled;
 bool config_output_diagnostics;
 
+bool config_sensors_enabled;
+int32_t config_sensor_interval_ms;
+bool config_sensor_bme280_enabled;
+uint8_t config_sensor_bme280_cs_pin;
+
 void config_init(void);
 void config_init_ephemeral(void);
 void config_apply(void);