mirror of
https://github.com/boschsensortec/BME280_SensorAPI.git
synced 2024-10-05 20:47:48 -04:00
101 lines
2.6 KiB
C
101 lines
2.6 KiB
C
/*
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Linux userspace test code, simple and mose code directy from the doco.
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compile like this: gcc linux_userspace.c ../bme280.c -I ../ -o bme280
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tested: Raspberry Pi.
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Use like: ./bme280 /dev/i2c-0
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*/
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#include "bme280.h"
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <linux/i2c-dev.h>
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#include <sys/ioctl.h>
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#include <sys/types.h>
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#include <fcntl.h>
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int fd;
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int8_t user_i2c_read(uint8_t id, uint8_t reg_addr, uint8_t *data, uint16_t len)
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{
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write(fd, ®_addr,1);
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read(fd, data, len);
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return 0;
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}
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void user_delay_ms(uint32_t period)
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{
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usleep(period*1000);
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}
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int8_t user_i2c_write(uint8_t id, uint8_t reg_addr, uint8_t *data, uint16_t len)
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{
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int8_t *buf;
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buf = malloc(len +1);
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buf[0] = reg_addr;
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memcpy(buf +1, data, len);
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write(fd, buf, len +1);
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free(buf);
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return 0;
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}
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void print_sensor_data(struct bme280_data *comp_data)
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{
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#ifdef BME280_FLOAT_ENABLE
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printf("temp %0.2f, p %0.2f, hum %0.2f\r\n",comp_data->temperature, comp_data->pressure, comp_data->humidity);
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#else
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printf("temp %ld, p %ld, hum %ld\r\n",comp_data->temperature, comp_data->pressure, comp_data->humidity);
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#endif
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}
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int8_t stream_sensor_data_forced_mode(struct bme280_dev *dev)
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{
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int8_t rslt;
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uint8_t settings_sel;
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struct bme280_data comp_data;
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/* Recommended mode of operation: Indoor navigation */
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dev->settings.osr_h = BME280_OVERSAMPLING_1X;
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dev->settings.osr_p = BME280_OVERSAMPLING_16X;
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dev->settings.osr_t = BME280_OVERSAMPLING_2X;
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dev->settings.filter = BME280_FILTER_COEFF_16;
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settings_sel = BME280_OSR_PRESS_SEL | BME280_OSR_TEMP_SEL | BME280_OSR_HUM_SEL | BME280_FILTER_SEL;
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rslt = bme280_set_sensor_settings(settings_sel, dev);
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printf("Temperature, Pressure, Humidity\r\n");
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/* Continuously stream sensor data */
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while (1) {
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rslt = bme280_set_sensor_mode(BME280_FORCED_MODE, dev);
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/* Wait for the measurement to complete and print data @25Hz */
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dev->delay_ms(40);
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rslt = bme280_get_sensor_data(BME280_ALL, &comp_data, dev);
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print_sensor_data(&comp_data);
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}
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return rslt;
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}
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int main(int argc, char* argv[])
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{
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struct bme280_dev dev;
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int8_t rslt = BME280_OK;
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if ((fd = open(argv[1], O_RDWR)) < 0) {
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printf("Failed to open the i2c bus %s", argv[1]);
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exit(1);
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}
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if (ioctl(fd, I2C_SLAVE, 0x76) < 0) {
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printf("Failed to acquire bus access and/or talk to slave.\n");
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exit(1);
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}
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dev.dev_id = BME280_I2C_ADDR_PRIM;
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dev.intf = BME280_I2C_INTF;
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dev.read = user_i2c_read;
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dev.write = user_i2c_write;
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dev.delay_ms = user_delay_ms;
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rslt = bme280_init(&dev);
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stream_sensor_data_forced_mode(&dev);
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}
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