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bme280: reworked to allow platform-specific I2C implementations

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This commit is contained in:
Antonio Lignan 2016-11-03 11:12:20 +01:00
parent bd1a6bf94e
commit f9b32f8139
10 changed files with 207 additions and 75 deletions
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29
dev/bme280/bme280.c
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@ -35,13 +35,14 @@
/**
* \file
* Basic functions for Bosch BME280 based on datasheel Rev 1.1
* Basic functions for Bosch BME280 based on datasheet Rev 1.1
*/
#include "contiki.h"
#include <string.h>
#include "bme280.h"
#include "dev/bme280-arch.h"
#include "bme280-arch.h"
#include "lib/sensors.h"
static struct {
unsigned short dig_t1;
@ -160,19 +161,21 @@ bme280_init(uint8_t mode)
{
uint8_t buf[26];
bme280_arch_i2c_init();
/* Do not mess with other chips */
i2c_read_mem(BME280_ADDR, 0xD0, buf, 1);
bme280_arch_i2c_read_mem(BME280_ADDR, 0xD0, buf, 1);
if(buf[0] != BME280_CHIP_ID) {
return 0;
}
i2c_write_mem(BME280_ADDR, BME280_CNTL_RESET, 0xB6);
clock_delay_msec(BME280_MAX_WAIT);
bme280_arch_i2c_write_mem(BME280_ADDR, BME280_CNTL_RESET, 0xB6);
clock_delay_usec(BME280_MAX_WAIT);
memset(buf, 0, sizeof(buf));
/* Burst read of all calibration part 1 */
i2c_read_mem(BME280_ADDR, BME280_DIG_T1_ADDR, buf, sizeof(buf));
bme280_arch_i2c_read_mem(BME280_ADDR, BME280_DIG_T1_ADDR, buf, sizeof(buf));
bm.dig_t1 = ((uint16_t)buf[1] << 8) | (uint16_t)buf[0];
bm.dig_t2 = ((int16_t)buf[3] << 8) | (uint16_t)buf[2];
bm.dig_t3 = ((int16_t)buf[5] << 8) | (uint16_t)buf[4];
@ -189,7 +192,7 @@ bme280_init(uint8_t mode)
bm.dig_h1 = (unsigned char)buf[25];
/* Burst read of all calibration part 2 */
i2c_read_mem(BME280_ADDR, BME280_DIG_H2_ADDR, buf, 8);
bme280_arch_i2c_read_mem(BME280_ADDR, BME280_DIG_H2_ADDR, buf, 8);
bm.dig_h2 = ((int16_t)buf[1] << 8) | (uint16_t)buf[0];
bm.dig_h3 = (unsigned char)buf[2];
bm.dig_h4 = ((int16_t)buf[3] << 4) | (((uint16_t)buf[4]) & 0xF);
@ -217,23 +220,23 @@ bme280_read(uint8_t mode)
/* Weather mode. See sectiom 3.5 Datasheet */
if(mode == BME280_MODE_WEATHER) {
/* Humidity oversampling *1 */
i2c_write_mem(BME280_ADDR, BME280_CNTL_HUM, 0x01);
bme280_arch_i2c_write_mem(BME280_ADDR, BME280_CNTL_HUM, 0x01);
/* 00100111 0x27 oversampling *1 for t and p plus normal mode */
/* 0.5 ms -- no filter -- no SPI */
i2c_write_mem(BME280_ADDR, BME280_CONTROL, 0x00);
bme280_arch_i2c_write_mem(BME280_ADDR, BME280_CONTROL, 0x00);
/* 00100110 0x26 oversampling *1 for t and p plus forced mode */
/* Trigger measurement needed for every time in forced mode */
i2c_write_mem(BME280_ADDR, BME280_CNTL_MEAS, 0x26);
bme280_arch_i2c_write_mem(BME280_ADDR, BME280_CNTL_MEAS, 0x26);
/* Wait to get into sleep mode == measurement done */
for(i = 0; i < BME280_MAX_WAIT; i++) {
i2c_read_mem(BME280_ADDR, BME280_CNTL_MEAS, &sleep, 1);
bme280_arch_i2c_read_mem(BME280_ADDR, BME280_CNTL_MEAS, &sleep, 1);
sleep = sleep& 0x03;
if(sleep== 0) {
break;
} else {
clock_delay_msec(1);
clock_delay_usec(1000);
}
}
if(i == BME280_MAX_WAIT) {
@ -244,7 +247,7 @@ bme280_read(uint8_t mode)
}
/* Burst read of all measurements */
i2c_read_mem(BME280_ADDR, BME280_PRESS, buf, 8);
bme280_arch_i2c_read_mem(BME280_ADDR, BME280_PRESS, buf, 8);
ut = (uint32_t)(buf[3]) << 12 | (uint32_t)(buf[4]) << 4 | (uint32_t)buf[5] >> 4;
up = (uint32_t)(buf[0]) << 12 | (uint32_t)(buf[1]) << 4 | (uint32_t)buf[2] >> 4;
uh = (uint32_t)(buf[6]) << 8 | (uint32_t)buf[7];