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SI7021

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Add mgos_si7021_cmd() mimicking the SHT31 driver.
This commit is contained in:
Pim van Pelt
2018-04-02 21:16:32 +02:00
parent ff891426ab
commit 6b0774033e
1 changed files with 15 additions and 4 deletions
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19
src/mgos_si7021.c
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@ -19,6 +19,19 @@
#include "mgos_i2c.h" #include "mgos_i2c.h"
// Private functions follow // Private functions follow
static bool mgos_si7021_cmd(struct mgos_si7021 *sensor, uint8_t cmd) {
if (!sensor || !sensor->i2c)
return false;
if (!mgos_i2c_write(sensor->i2c, sensor->i2caddr, &cmd, 1, true)) {
LOG(LL_ERROR, ("I2C=0x%02x cmd=%u (0x%02x) write error", sensor->i2caddr, cmd, cmd));
return false;
}
LOG(LL_DEBUG, ("I2C=0x%02x cmd=%u (0x%02x) write success", sensor->i2caddr, cmd, cmd));
return true;
}
static uint8_t crc8(const uint8_t *data, int len) static uint8_t crc8(const uint8_t *data, int len)
{ {
const uint8_t POLYNOMIAL=0x31; const uint8_t POLYNOMIAL=0x31;
@ -76,10 +89,9 @@ bool mgos_si7021_read(struct mgos_si7021 *sensor) {
} }
// Read out sensor data here // Read out sensor data here
// //
uint8_t cmd = MGOS_SI7021_MEASRH_NOHOLD_CMD;
uint8_t data[3]; uint8_t data[3];
if (!mgos_i2c_write(sensor->i2c, sensor->i2caddr, &cmd, 1, false)) { if (!mgos_si7021_cmd(sensor, MGOS_SI7021_MEASRH_NOHOLD_CMD)) {
LOG(LL_ERROR, ("Could not write command")); LOG(LL_ERROR, ("Could not write command"));
return false; return false;
} }
@ -99,8 +111,7 @@ bool mgos_si7021_read(struct mgos_si7021 *sensor) {
humidity -= 6; humidity -= 6;
sensor->humidity = humidity; sensor->humidity = humidity;
cmd=MGOS_SI7021_MEASTEMP_NOHOLD_CMD; if (!mgos_si7021_cmd(sensor, MGOS_SI7021_MEASTEMP_NOHOLD_CMD)) {
if (!mgos_i2c_write(sensor->i2c, sensor->i2caddr, &cmd, 1, false)) {
LOG(LL_ERROR, ("Could not write command")); LOG(LL_ERROR, ("Could not write command"));
return false; return false;
} }