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Update shtc3 API

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This commit is contained in:
rbaron 2022-11-16 19:49:09 +01:00
parent 597542649a
commit 8c7a2c35de
3 changed files with 23 additions and 17 deletions
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5
code/nrf-connect/src/main.c
View file

@ -27,12 +27,17 @@ int main(void) {
RET_IF_ERR(prst_adc_batt_read(&sensors.batt));
RET_IF_ERR(prst_adc_soil_read(sensors.batt.voltage, &sensors.soil));
RET_IF_ERR(prst_adc_photo_read(sensors.batt.voltage, &sensors.photo));
RET_IF_ERR(prst_shtc3_read(&sensors.shtc3))
LOG_INF("Batt: %d mV", sensors.batt.millivolts);
LOG_INF("Soil: %.0f %% (%.3f mV)", 100 * sensors.soil.percentage,
sensors.soil.adc_read.voltage);
LOG_INF("Photo: %u lx (%.3f mV)", sensors.photo.brightness,
sensors.soil.adc_read.voltage);
LOG_INF("Temp: %f oC (%d)", sensors.shtc3.temp_c,
(int)sensors.shtc3.temp_c);
LOG_INF("Humi: %.0f %%", 100.0 * sensors.shtc3.rel_humi);
LOG_INF("--------------------------------------------------");
k_msleep(500);
}
}

33
code/nrf-connect/src/prst/shtc3.c
View file

@ -4,28 +4,31 @@
#include <logging/log.h>
#include <zephyr/zephyr.h>
LOG_MODULE_REGISTER(shtc3, LOG_LEVEL_DBG);
#include "prst/macros.h"
LOG_MODULE_REGISTER(shtc3, LOG_LEVEL_INF);
static const struct i2c_dt_spec shtc3 = I2C_DT_SPEC_GET(DT_NODELABEL(shtc3));
static uint8_t buff[6];
static void write_cmd(uint16_t command) {
static int write_cmd(uint16_t command) {
static uint8_t cmd[2];
cmd[0] = command >> 8;
cmd[1] = command & 0xff;
if (i2c_write_dt(&shtc3, cmd, sizeof(cmd)) != 0) {
LOG_ERR("Error writing command");
}
RET_IF_ERR(i2c_write_dt(&shtc3, cmd, sizeof(cmd)));
return 0;
}
prst_shtc3_read_t prst_shtc3_read() {
int prst_shtc3_read(prst_shtc3_read_t *out) {
RET_IF_ERR_MSG(!device_is_ready(shtc3.bus), "SHTC3 is not ready");
// Wake the sensor up.
write_cmd(PRST_SHTC3_CMD_WAKEUP);
RET_IF_ERR(write_cmd(PRST_SHTC3_CMD_WAKEUP));
k_msleep(1);
// Request measurement.
write_cmd(PRST_SHTC3_CMD_MEASURE_TFIRST_NORMAL);
RET_IF_ERR(write_cmd(PRST_SHTC3_CMD_MEASURE_TFIRST_NORMAL));
// Reading in normal (not low power) mode can take up to 12.1 ms, according to
// the datasheet.
@ -36,19 +39,17 @@ prst_shtc3_read_t prst_shtc3_read() {
}
// Put the sensor in sleep mode.
write_cmd(PRST_SHTC3_CMD_SLEEP);
RET_IF_ERR(write_cmd(PRST_SHTC3_CMD_SLEEP));
// TODO: Uninit i2c to save power?
// TODO: verify the CRC of the measurements. The function is described in the
// datasheet.
float temp_c = -45 + 175 * ((float)((buff[0] << 8) | buff[1])) / (1 << 16);
float humi = ((float)((buff[3] << 8) | buff[4])) / UINT16_MAX;
out->temp_c = -45 + 175 * ((float)((buff[0] << 8) | buff[1])) / (1 << 16);
out->rel_humi = ((float)((buff[3] << 8) | buff[4])) / UINT16_MAX;
prst_shtc3_read_t ret = {.temp_c = temp_c, .rel_humi = humi};
LOG_INF("Read temp: %f oC (%d)", ret.temp_c, (int)temp_c);
LOG_INF("Read humi: %.0f %%", 100.0 * ret.rel_humi);
return ret;
LOG_DBG("Read temp: %f oC (%d)", out->temp_c, (int)out->temp_c);
LOG_DBG("Read humi: %.0f %%", 100.0 * out->rel_humi);
return 0;
}

2
code/nrf-connect/src/prst/shtc3.h
View file

@ -15,6 +15,6 @@ typedef struct {
float rel_humi;
} prst_shtc3_read_t;
prst_shtc3_read_t prst_shtc3_read();
int prst_shtc3_read(prst_shtc3_read_t *out);
#endif // _PRST_SHT3C_H_