BSD example

examples/bsd_userspace.c

@@ -0,0 +1,202 @@
+/*
+ * BSD userspace test code, simple and mose code directy from the doco.
+ * compile like this: cc bsd_userspace.c ../bme280.c -I ../ -o bme280
+ * tested: NanoPi NEO.
+ * Use like: ./bme280 /dev/iic0
+ */
+#include "bme280.h"
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <fcntl.h>
+
+#include <sys/ioctl.h>
+#include <dev/iicbus/iic.h>
+
+int fd;
+
+int8_t user_i2c_read(uint8_t id, uint8_t reg_addr, uint8_t *data, uint16_t len);
+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);
+void print_sensor_data(struct bme280_data *comp_data);
+int8_t stream_sensor_data_forced_mode(struct bme280_dev *dev);
+
+
+int8_t user_i2c_read(uint8_t id, uint8_t reg_addr, uint8_t *data, uint16_t len)
+{
+    struct iic_msg msgs[2] = {
+        {id << 1 | IIC_M_WR, IIC_M_WR, 1, &reg_addr},
+        {id << 1 | IIC_M_RD, IIC_M_RD, len, data},
+    };
+
+    struct iic_rdwr_data rdwr_data = {msgs, 2};
+
+    int error = ioctl(fd, I2CRDWR, &rdwr_data);
+    if (error) {
+        return BME280_E_COMM_FAIL;
+    }
+
+    return BME280_OK;
+}
+
+
+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)
+{
+    uint8_t *buf = malloc( (1 + len) * sizeof(uint8_t) );
+    if (buf == NULL) {
+        return BME280_E_COMM_FAIL;
+    }
+
+    buf[0] = reg_addr;
+
+    for (int i = 0; i < len; i++) {
+        buf[i+1] = data[i];
+    }
+
+    struct iic_msg msg;
+
+    msg.slave = id << 1 | !IIC_M_RD;
+    msg.flags = !IIC_M_RD;
+    msg.len = (1 + len) * sizeof(uint8_t);
+    msg.buf = buf;
+
+    struct iic_rdwr_data rdwr_data = {&msg, 1};
+
+    int error = ioctl(fd, I2CRDWR, &rdwr_data);
+    if (error) {
+        free(buf);
+        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
+    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
+    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;
+
+    /* 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);
+    if (rslt != BME280_OK)
+    {
+        fprintf(stderr, "Failed to set sensor settings (code %+d).", rslt);
+        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);
+        dev->delay_ms(1000);
+    }
+
+    return rslt;
+}
+
+
+
+int main(int argc, char* argv[])
+{
+    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
+;
+
+    dev.intf = BME280_I2C_INTF;
+    dev.read = user_i2c_read;
+    dev.write = user_i2c_write;
+    dev.delay_ms = user_delay_ms;
+
+
+    if ((fd = open(argv[1], O_RDWR)) < 0)
+    {
+        fprintf(stderr, "Failed to open the i2c bus %s\n", argv[1]);
+        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;
+}