tested: Raspberry Pi.
Use like: ./bme280 /dev/i2c-0
*/
-#include "bme280.h"
+
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <fcntl.h>
+#include "bme280.h"
int fd;
int8_t user_i2c_read(uint8_t id, uint8_t reg_addr, uint8_t *data, uint16_t len)
{
- write(fd, ®_addr, 1);
- read(fd, data, len);
- return 0;
+ if (write(fd, ®_addr, sizeof(reg_addr)) < sizeof(reg_addr))
+ return BME280_E_COMM_FAIL;
+ if (read(fd, data, len) < len)
+ return BME280_E_COMM_FAIL;
+ return BME280_OK;
}
void user_delay_ms(uint32_t period)
int8_t user_i2c_write(uint8_t id, uint8_t reg_addr, uint8_t *data, uint16_t len)
{
int8_t *buf;
- buf = malloc(len +1);
+ buf = malloc(len + 1);
buf[0] = reg_addr;
memcpy(buf + 1, data, len);
- write(fd, buf, len + 1);
+ if (write(fd, buf, len + 1) < len)
+ return BME280_E_COMM_FAIL;
free(buf);
- return 0;
+ return BME280_OK;
}
void print_sensor_data(struct bme280_data *comp_data)
rslt = bme280_set_sensor_settings(settings_sel, dev);
if (rslt != BME280_OK)
{
- fprintf(stderr, "Failed to set sensor settings.");
+ fprintf(stderr, "Failed to set sensor settings (code %+d).", rslt);
return rslt;
}
{
rslt = bme280_set_sensor_mode(BME280_FORCED_MODE, dev);
if (rslt != BME280_OK)
+ {
+ fprintf(stderr, "Failed to set sensor mode (code %+d).", rslt);
break;
+ }
/* Wait for the measurement to complete and print data @25Hz */
dev->delay_ms(40);
rslt = bme280_get_sensor_data(BME280_ALL, &comp_data, dev);
if (rslt != BME280_OK)
+ {
+ fprintf(stderr, "Failed to get sensor data (code %+d).", rslt);
break;
+ }
print_sensor_data(&comp_data);
}
return rslt;
rslt = bme280_init(&dev);
if (rslt != BME280_OK)
{
- fprintf(stderr, "Failed to initialize the device.\n");
+ fprintf(stderr, "Failed to initialize the device (code %+d).\n", rslt);
exit(1);
}
rslt = stream_sensor_data_forced_mode(&dev);
if (rslt != BME280_OK)
{
- fprintf(stderr, "Failed to stream sensor data.\n");
+ fprintf(stderr, "Failed to stream sensor data (code %+d).\n", rslt);
exit(1);
}
return 0;