2 * Linux userspace test code, simple and mose code directy from the doco.
\r
3 * compile like this: gcc linux_userspace.c ../bme280.c -I ../ -o bme280
\r
4 * tested: Raspberry Pi.
\r
5 * Use like: ./bme280 /dev/i2c-0
\r
13 #include <linux/i2c-dev.h>
\r
14 #include <sys/ioctl.h>
\r
16 #include <sys/types.h>
\r
21 int8_t user_i2c_read(uint8_t id, uint8_t reg_addr, uint8_t *data, uint16_t len);
\r
22 void user_delay_ms(uint32_t period);
\r
23 int8_t user_i2c_write(uint8_t id, uint8_t reg_addr, uint8_t *data, uint16_t len);
\r
24 void print_sensor_data(struct bme280_data *comp_data);
\r
25 int8_t stream_sensor_data_forced_mode(struct bme280_dev *dev);
\r
27 int8_t user_i2c_read(uint8_t id, uint8_t reg_addr, uint8_t *data, uint16_t len)
\r
29 write(fd, ®_addr, 1);
\r
30 read(fd, data, len);
\r
35 void user_delay_ms(uint32_t period)
\r
37 usleep(period * 1000);
\r
40 int8_t user_i2c_write(uint8_t id, uint8_t reg_addr, uint8_t *data, uint16_t len)
\r
44 buf = malloc(len + 1);
\r
46 memcpy(buf + 1, data, len);
\r
47 if (write(fd, buf, len + 1) < len)
\r
48 return BME280_E_COMM_FAIL;
\r
53 void print_sensor_data(struct bme280_data *comp_data)
\r
55 float temp, press, hum;
\r
56 #ifdef BME280_FLOAT_ENABLE
\r
57 temp = comp_data->temperature;
\r
58 press = 0.01 * comp_data->pressure;
\r
59 hum = comp_data->humidity;
\r
61 #ifdef BME280_64BIT_ENABLE
\r
62 temp = 0.01f * comp_data->temperature;
\r
63 press = 0.0001f * comp_data->pressure;
\r
64 hum = 1.0f / 1024.0f * comp_data->humidity;
\r
66 temp = 0.01f * comp_data->temperature;
\r
67 press = 0.01f * comp_data->pressure;
\r
68 hum = 1.0f / 1024.0f * comp_data->humidity;
\r
71 printf("%0.2lf deg C, %0.2lf hPa, %0.2lf%%\n", temp, press, hum);
\r
74 int8_t stream_sensor_data_forced_mode(struct bme280_dev *dev)
\r
77 uint8_t settings_sel;
\r
78 struct bme280_data comp_data;
\r
80 /* Recommended mode of operation: Indoor navigation */
\r
81 dev->settings.osr_h = BME280_OVERSAMPLING_1X;
\r
82 dev->settings.osr_p = BME280_OVERSAMPLING_16X;
\r
83 dev->settings.osr_t = BME280_OVERSAMPLING_2X;
\r
84 dev->settings.filter = BME280_FILTER_COEFF_16;
\r
86 settings_sel = BME280_OSR_PRESS_SEL | BME280_OSR_TEMP_SEL | BME280_OSR_HUM_SEL | BME280_FILTER_SEL;
\r
88 rslt = bme280_set_sensor_settings(settings_sel, dev);
\r
89 if (rslt != BME280_OK)
\r
91 fprintf(stderr, "Failed to set sensor settings (code %+d).", rslt);
\r
95 printf("Temperature, Pressure, Humidity\n");
\r
96 /* Continuously stream sensor data */
\r
99 rslt = bme280_set_sensor_mode(BME280_FORCED_MODE, dev);
\r
100 if (rslt != BME280_OK)
\r
102 fprintf(stderr, "Failed to set sensor mode (code %+d).", rslt);
\r
105 /* Wait for the measurement to complete and print data @25Hz */
\r
107 rslt = bme280_get_sensor_data(BME280_ALL, &comp_data, dev);
\r
108 if (rslt != BME280_OK)
\r
110 fprintf(stderr, "Failed to get sensor data (code %+d).", rslt);
\r
113 print_sensor_data(&comp_data);
\r
119 int main(int argc, char* argv[])
\r
121 struct bme280_dev dev;
\r
122 int8_t rslt = BME280_OK;
\r
126 fprintf(stderr, "Missing argument for i2c bus.\n");
\r
130 // make sure to select BME280_I2C_ADDR_PRIM
\r
131 // or BME280_I2C_ADDR_SEC as needed
\r
134 BME280_I2C_ADDR_PRIM
\r
136 BME280_I2C_ADDR_SEC
\r
140 dev.intf = BME280_I2C_INTF;
\r
141 dev.read = user_i2c_read;
\r
142 dev.write = user_i2c_write;
\r
143 dev.delay_ms = user_delay_ms;
\r
145 if ((fd = open(argv[1], O_RDWR)) < 0)
\r
147 fprintf(stderr, "Failed to open the i2c bus %s\n", argv[1]);
\r
151 if (ioctl(fd, I2C_SLAVE, dev.dev_id) < 0)
\r
153 fprintf(stderr, "Failed to acquire bus access and/or talk to slave.\n");
\r
158 rslt = bme280_init(&dev);
\r
159 if (rslt != BME280_OK)
\r
161 fprintf(stderr, "Failed to initialize the device (code %+d).\n", rslt);
\r
164 rslt = stream_sensor_data_forced_mode(&dev);
\r
165 if (rslt != BME280_OK)
\r
167 fprintf(stderr, "Failed to stream sensor data (code %+d).\n", rslt);
\r