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Merge pull request #73 from byteneumann/patch-1
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linux example improvements
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Bosch Sensortec authored Aug 2, 2019
2 parents 9424d91 + 64216fe commit 47596cd
Showing 1 changed file with 116 additions and 55 deletions.
171 changes: 116 additions & 55 deletions examples/linux_userspace.c
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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
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>
Expand All @@ -13,88 +13,149 @@
#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, &reg_addr,1);
read(fd, data, len);
return 0;
if (write(fd, &reg_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)
{
usleep(period*1000);
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;
int8_t *buf;
buf = malloc(len + 1);
buf[0] = reg_addr;
memcpy(buf + 1, data, len);
if (write(fd, buf, len + 1) < len)
return BME280_E_COMM_FAIL;
free(buf);
return BME280_OK;
}

void print_sensor_data(struct bme280_data *comp_data)
{
float temp, press, hum;
#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);
temp = comp_data->temperature;
press = 0.01 * comp_data->pressure;
hum = comp_data->humidity;
#else
#ifdef BME280_64BIT_ENABLE
temp = 0.01f * comp_data->temperature;
press = 0.0001f * comp_data->pressure;
hum = 1.0f / 1024.0f * comp_data->humidity;
#else
printf("temp %ld, p %ld, hum %ld\r\n",comp_data->temperature, comp_data->pressure, comp_data->humidity);
temp = 0.01f * comp_data->temperature;
press = 0.01f * comp_data->pressure;
hum = 1.0f / 1024.0f * comp_data->humidity;
#endif
#endif
printf("%0.2lf deg C, %0.2lf hPa, %0.2lf%%\n", temp, press, hum);
}

int8_t stream_sensor_data_forced_mode(struct bme280_dev *dev)
{
int8_t rslt;
uint8_t settings_sel;
struct bme280_data comp_data;
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;
/* 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;
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);
rslt = bme280_set_sensor_settings(settings_sel, dev);
if (rslt != BME280_OK)
{
fprintf(stderr, "Failed to set sensor settings (code %+d).", rslt);
return rslt;
}

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;
printf("Temperature, Pressure, Humidity\n");
/* Continuously stream sensor data */
while (1)
{
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;
}

int main(int argc, char* argv[])
{
struct bme280_dev dev;
int8_t rslt = BME280_OK;
struct bme280_dev dev;
int8_t rslt = BME280_OK;

if (argc < 2)
{
fprintf(stderr, "Missing argument for i2c bus.\n");
exit(1);
}

// make sure to select BME280_I2C_ADDR_PRIM
// or BME280_I2C_ADDR_SEC as needed
dev.dev_id =
#if 1
BME280_I2C_ADDR_PRIM
#else
BME280_I2C_ADDR_SEC
#endif
;

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;
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);
if ((fd = open(argv[1], O_RDWR)) < 0)
{
fprintf(stderr, "Failed to open the i2c bus %s\n", argv[1]);
exit(1);
}
if (ioctl(fd, I2C_SLAVE, dev.dev_id) < 0)
{
fprintf(stderr, "Failed to acquire bus access and/or talk to slave.\n");
exit(1);
}

rslt = bme280_init(&dev);
if (rslt != BME280_OK)
{
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 (code %+d).\n", rslt);
exit(1);
}
return 0;
}

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