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WIP SPS30

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This commit is contained in:
mj 2022-01-09 13:47:13 +01:00
parent 6ecc10c7e0
commit e10e7f5c31
2 changed files with 19 additions and 20 deletions
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1
fw/Core/Inc/sps30.h
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@ -19,6 +19,7 @@
*/ */
#define SPS30_I2C_ADDRESS 0x69 #define SPS30_I2C_ADDRESS 0x69
#define SPS30_MEASURED_VALUES_COUNT 10
/* /*
* Return values * Return values

38
fw/Core/Src/sps30.c
View File

@ -26,18 +26,16 @@ int8_t sps30_send_cmd(sps30_cmd_t cmd)
int8_t sps30_start_measurement( void ) int8_t sps30_start_measurement( void )
{ {
uint8_t i2c_tx_buffer[5]; uint8_t buffer[5];
uint8_t data_for_crc = {SPS30_UINT16_FORMAT, 0x00};
uint8_t result; uint8_t result;
i2c_tx_buffer[0] = SPS30_START_MEASUREMENT >> 8; buffer[0] = SPS30_START_MEASUREMENT >> 8;
i2c_tx_buffer[1] = SPS30_START_MEASUREMENT & 0x00ff; buffer[1] = SPS30_START_MEASUREMENT & 0x00ff;
i2c_tx_buffer[2] = SPS30_UINT16_FORMAT; buffer[2] = SPS30_UINT16_FORMAT;
i2c_tx_buffer[3] = 0x00; buffer[3] = 0x00;
i2c_tx_buffer[4] = calculate_crc(data_for_crc); buffer[4] = crc8_calculate(buffer + 2, 2);
result = i2c_transmit(SPS30_I2C_ADDRESS<<1, i2c_tx_buffer, 5); result = i2c_transmit(SPS30_I2C_ADDRESS<<1, buffer, 5);
if (result != I2C_OK) { if (result != I2C_OK) {
return SPS30_ERROR; return SPS30_ERROR;
@ -60,28 +58,28 @@ int8_t sps30_read_measured_values(sps30_data_t *measured_data)
buffer[0] = SPS30_READ_MEASURED_VALUES >> 8; buffer[0] = SPS30_READ_MEASURED_VALUES >> 8;
buffer[1] = SPS30_READ_MEASURED_VALUES & 0xFF; buffer[1] = SPS30_READ_MEASURED_VALUES & 0xFF;
result = i2c_transmit(SPS30_I2C_ADDRESS<<1, buffer, 2); result = i2c_transmit(SPS30_I2C_ADDRESS<<1, buffer, 2);
if (result != I2C_OK) { if (result != I2C_OK) {
return SPS30_ERROR; return SPS30_ERROR;
} }
LL_mDelay(10); // 10 ms should be enough LL_mDelay(10); // 10 ms should be enough
// read out // read out
result = i2c_receive(SPS30_I2C_ADDRESS<<1, buffer, 30); result = i2c_receive(SPS30_I2C_ADDRESS<<1, buffer, 3 * SPS30_MEASURED_VALUES_COUNT);
if (result != I2C_OK) if (result != I2C_OK)
{ {
return SPS30_ERROR; return SPS30_ERROR;
} }
/* check data integrity */
uint8_t checksums[10]; for (uint8_t i = 0; i < SPS30_MEASURED_VALUES_COUNT; i++)
uint8_t j = 0;
for (uint8_t i = 0; i < 10; i++)
{ {
// measured_values[i] = (i2c_rx_buffer[j++] << 8) + i2c_rx_buffer[j++];
measured_values[i] = (i2c_rx_buffer[j++] << 8) + i2c_rx_buffer[j++]; // checksums[i] = i2c_rx_buffer[j++];
checksums[i] = i2c_rx_buffer[j++]; uint8_t checksum_calculated = crc8_calculate(buffer + 3*i, 2);
uint8_t checksum_received = buffer[3*i + 2];
if (checksum_calculated != checksum_received) {
return SPS30_CRC8_ERROR;
}
} }
/* copy to output struct */
return SPS30_OK; return SPS30_OK;
} }