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Merge pull request #57 from janwilleke/master

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Linux userspace example code
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Bosch Sensortec 2018-07-24 08:57:56 +02:00 committed by GitHub
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/*
Linux userspace test code, simple and mose code directy from the doco.
compile like this: gcc linux_userspace.c ../bme280.c -I ../ -o bme280
tested: Raspberry Pi.
Use like: ./bme280 /dev/i2c-0
*/
#include "bme280.h"
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <linux/i2c-dev.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <fcntl.h>
int fd;
int8_t user_i2c_read(uint8_t id, uint8_t reg_addr, uint8_t *data, uint16_t len)
{
write(fd, &reg_addr,1);
read(fd, data, len);
return 0;
}
void user_delay_ms(uint32_t period)
{
usleep(period*1000);
}
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[0] = reg_addr;
memcpy(buf +1, data, len);
write(fd, buf, len +1);
free(buf);
return 0;
}
void print_sensor_data(struct bme280_data *comp_data)
{
#ifdef BME280_FLOAT_ENABLE
printf("temp %0.2f, p %0.2f, hum %0.2f\r\n",comp_data->temperature, comp_data->pressure, comp_data->humidity);
#else
printf("temp %ld, p %ld, hum %ld\r\n",comp_data->temperature, comp_data->pressure, comp_data->humidity);
#endif
}
int8_t stream_sensor_data_forced_mode(struct bme280_dev *dev)
{
int8_t rslt;
uint8_t settings_sel;
struct bme280_data comp_data;
/* Recommended mode of operation: Indoor navigation */
dev->settings.osr_h = BME280_OVERSAMPLING_1X;
dev->settings.osr_p = BME280_OVERSAMPLING_16X;
dev->settings.osr_t = BME280_OVERSAMPLING_2X;
dev->settings.filter = BME280_FILTER_COEFF_16;
settings_sel = BME280_OSR_PRESS_SEL | BME280_OSR_TEMP_SEL | BME280_OSR_HUM_SEL | BME280_FILTER_SEL;
rslt = bme280_set_sensor_settings(settings_sel, dev);
printf("Temperature, Pressure, Humidity\r\n");
/* Continuously stream sensor data */
while (1) {
rslt = bme280_set_sensor_mode(BME280_FORCED_MODE, dev);
/* Wait for the measurement to complete and print data @25Hz */
dev->delay_ms(40);
rslt = bme280_get_sensor_data(BME280_ALL, &comp_data, dev);
print_sensor_data(&comp_data);
}
return rslt;
}
int main(int argc, char* argv[])
{
struct bme280_dev dev;
int8_t rslt = BME280_OK;
if ((fd = open(argv[1], O_RDWR)) < 0) {
printf("Failed to open the i2c bus %s", argv[1]);
exit(1);
}
if (ioctl(fd, I2C_SLAVE, 0x76) < 0) {
printf("Failed to acquire bus access and/or talk to slave.\n");
exit(1);
}
dev.dev_id = BME280_I2C_ADDR_PRIM;
dev.intf = BME280_I2C_INTF;
dev.read = user_i2c_read;
dev.write = user_i2c_write;
dev.delay_ms = user_delay_ms;
rslt = bme280_init(&dev);
stream_sensor_data_forced_mode(&dev);
}