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SPS30 readout

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This commit is contained in:
mj 2022-01-09 17:47:01 +01:00
parent e10e7f5c31
commit 29f702add2
4 changed files with 86 additions and 49 deletions
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2
fw/Core/Inc/sps30.h
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@ -76,7 +76,7 @@ int8_t sps30_send_cmd(sps30_cmd_t cmd);
int8_t sps30_start_measurement( void );
int8_t sps30_stop_measurement( void );
int8_t sps30_read_measured_values(uint16_t *measured_values, uint8_t measured_values_len);
int8_t sps30_read_measured_values(sps30_data_t *measured_data);
int8_t sps30_sleep( void );
int8_t sps30_wake_up( void );

63
fw/Core/Src/main.c
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@ -71,13 +71,23 @@ const uint16_t tim21_period = 1200-1; // 6s
/* Input registers memory map implementation */
enum
{
REGISTER_NUM_CO2 = 30010,
REGISTER_NUM_T_SHT4x = 30011,
REGISTER_NUM_RH_SHT4x = 30012,
REGISTER_NUM_T_SCD4x = 30013,
REGISTER_NUM_RH_SCD4x = 30014,
REGISTER_NUM_T_SHT4x_SIGNED = 30015,
REGISTER_NUM_T_SCD4x_SIGNED = 30016
REGISTER_NUM_CO2 = 30010, /* ppm */
REGISTER_NUM_T_SHT4x = 30011, /* deg C */
REGISTER_NUM_RH_SHT4x = 30012, /* % */
REGISTER_NUM_T_SCD4x = 30013, /* deg C */
REGISTER_NUM_RH_SCD4x = 30014, /* % */
REGISTER_NUM_T_SHT4x_SIGNED = 30015, /* deg C */
REGISTER_NUM_T_SCD4x_SIGNED = 30016, /* deg C */
REGISTER_NUM_PMC_MASS_1_0 = 30017, /* ug / m^3 */
REGISTER_NUM_PMC_MASS_2_5 = 30018, /* ug / m^3 */
REGISTER_NUM_PMC_MASS_4_0 = 30019, /* ug / m^3 */
REGISTER_NUM_PMC_MASS_10_0 = 30020, /* ug / m^3 */
REGISTER_NUM_PMC_NUMBER_0_5 = 30021, /* 1 / m^3 */
REGISTER_NUM_PMC_NUMBER_1_0 = 30022, /* 1 / m^3 */
REGISTER_NUM_PMC_NUMBER_2_5 = 30023, /* 1 / m^3 */
REGISTER_NUM_PMC_NUMBER_4_0 = 30024, /* 1 / m^3 */
REGISTER_NUM_PMC_NUMBER_10_0 = 30025, /* 1 / m^3 */
REGISTER_NUM_TYPICAL_PARTICLE_SIZE = 30026 /* nm */
} data_registers_numbers;
enum
@ -105,7 +115,7 @@ enum
/* Variables to store the measured data */
int16_t T_SCD4x, T_SHT4x;
uint16_t CO2, RH_SCD4x, RH_SHT4x;
uint16_t sps30_measured_data[10];
sps30_data_t PM_SPS30;
/* Struct to store the sensor config */
config_t sensor_config;
@ -242,10 +252,6 @@ int main(void)
device_id.object_name.ModelName = "Hugo";
modbus_slave_init_device_id(&device_id);
LL_mDelay(2000);
scd4x_start_periodic_measurement();
uint8_t scd4x_is_connected = 0;
uint8_t sps30_is_connected = 0;
/* USER CODE END 2 */
@ -259,6 +265,7 @@ int main(void)
/* Attempt to start SPS30 measurement and check if it's connected */
sps30_reset();
LL_mDelay(500); // should be less than 100 ms (we have 500 just to be sure)
if (sps30_start_measurement() == SPS30_OK)
{
sps30_is_connected = 1;
@ -345,7 +352,7 @@ int main(void)
/* Read SPS30 data (if connected) */
if (sps30_is_connected == 1)
{
sps30_read_measured_values(sps30_measured_data, 10);
sps30_read_measured_values(&PM_SPS30);
}
/* TODO: Process data and light a desired color of LED */
/* TODO: Add hystheresis */
@ -855,6 +862,36 @@ int8_t modbus_slave_callback(modbus_transaction_t *transaction)
case REGISTER_NUM_T_SCD4x_SIGNED:
transaction->input_registers_signed[i] = (int16_t)T_SCD4x;
break;
case REGISTER_NUM_PMC_MASS_1_0:
transaction->input_registers[i] = (uint16_t)PM_SPS30.mass_concentration[PM1_0];
break;
case REGISTER_NUM_PMC_MASS_2_5:
transaction->input_registers[i] = (uint16_t)PM_SPS30.mass_concentration[PM2_5];
break;
case REGISTER_NUM_PMC_MASS_4_0:
transaction->input_registers[i] = (uint16_t)PM_SPS30.mass_concentration[PM4_0];
break;
case REGISTER_NUM_PMC_MASS_10_0:
transaction->input_registers[i] = (uint16_t)PM_SPS30.mass_concentration[PM10_0];
break;
case REGISTER_NUM_PMC_NUMBER_0_5:
transaction->input_registers[i] = (uint16_t)PM_SPS30.number_concentration[PM0_5];
break;
case REGISTER_NUM_PMC_NUMBER_1_0:
transaction->input_registers[i] = (uint16_t)PM_SPS30.number_concentration[PM1_0];
break;
case REGISTER_NUM_PMC_NUMBER_2_5:
transaction->input_registers[i] = (uint16_t)PM_SPS30.number_concentration[PM2_5];
break;
case REGISTER_NUM_PMC_NUMBER_4_0:
transaction->input_registers[i] = (uint16_t)PM_SPS30.number_concentration[PM4_0];
break;
case REGISTER_NUM_PMC_NUMBER_10_0:
transaction->input_registers[i] = (uint16_t)PM_SPS30.number_concentration[PM10_0];
break;
case REGISTER_NUM_TYPICAL_PARTICLE_SIZE:
transaction->input_registers[i] = (uint16_t)PM_SPS30.typical_particle_size;
break;
default:
return MODBUS_ERROR_FUNCTION_NOT_IMPLEMENTED;
}

58
fw/Core/Src/sps30.c
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@ -71,8 +71,6 @@ int8_t sps30_read_measured_values(sps30_data_t *measured_data)
/* check data integrity */
for (uint8_t i = 0; i < SPS30_MEASURED_VALUES_COUNT; i++)
{
// measured_values[i] = (i2c_rx_buffer[j++] << 8) + 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) {
@ -80,6 +78,21 @@ int8_t sps30_read_measured_values(sps30_data_t *measured_data)
}
}
/* copy to output struct */
/* mass concencration [ug / m^3] */
int pos = 0;
for (int i = 0; i < 4; i++) {
/* i + 1 because mass concentration starts at PM1.0 (there is no PM0.5) */
measured_data->mass_concentration[i + 1] = (buffer[pos] << 8) + buffer[pos + 1];
pos += 3; /* 2 B data, 1 B crc */
}
/* number concentration [1 / cm^3] */
for (int i = 0; i < 5; i++) {
measured_data->number_concentration[i] = (buffer[pos] << 8) + buffer[pos + 1];
pos += 3;
}
/* typical particle size [nm] */
measured_data->typical_particle_size = (buffer[pos] << 8) + buffer[pos + 1];
return SPS30_OK;
}
@ -91,7 +104,6 @@ int8_t sps30_sleep( void )
int8_t sps30_wake_up( void )
{
return sps30_send_cmd(SPS30_WAKE_UP);
return sps30_send_cmd(SPS30_WAKE_UP);
}
int8_t sps30_start_fan_cleaning( void )
@ -104,30 +116,25 @@ int8_t sps30_reset( void )
return sps30_send_cmd(SPS30_RESET);
}
int8_t sps30_read_status_register ( void )
{
uint8_t i2c_tx_buffer[2];
uint8_t i2c_rx_buffer[6];
uint8_t buffer[6];
uint8_t result;
// start measurement
i2c_tx_buffer[0] = SPS30_READ_DEVICE_STATUS_REGISTER >> 8;
i2c_tx_buffer[1] = SPS30_READ_DEVICE_STATUS_REGISTER & 0x00ff;
result = i2c_transmit(SPS30_I2C_ADDRESS<<1, i2c_tx_buffer, 2);
// TODO: Proc to vraci NACK? Vyresit.
/*if (result != I2C_OK) {
buffer[0] = SPS30_READ_DEVICE_STATUS_REGISTER >> 8;
buffer[1] = SPS30_READ_DEVICE_STATUS_REGISTER & 0x00ff;
result = i2c_transmit(SPS30_I2C_ADDRESS<<1, buffer, 2);
if (result != I2C_OK) {
return SPS30_ERROR;
}
return SPS30_OK;*/
LL_mDelay(1); // 10 ms should be enough
LL_mDelay(10); // 10 ms should be enough
// read out
result = i2c_receive(SPS30_I2C_ADDRESS<<1, i2c_rx_buffer, 6);
result = i2c_receive(SPS30_I2C_ADDRESS<<1, buffer, 6);
// TODO
return 0;
return SPS30_OK;
}
int8_t sps30_read_firmware_version ( uint8_t * fw_ver_hi, uint8_t * fw_ver_lo )
@ -161,20 +168,3 @@ int8_t sps30_read_firmware_version ( uint8_t * fw_ver_hi, uint8_t * fw_ver_lo )
return SPS30_OK;
}
//
//uint8_t calculate_crc(uint8_t data[2])
//{
// uint8_t crc = 0xFF;
// for(uint8_t i = 0; i < 2; i++) {
// crc ^= data[i];
// for(uint8_t bit = 8; bit > 0; --bit) {
// if(crc & 0x80) {
// crc = (crc << 1) ^ 0x31u;
// } else {
// crc = (crc << 1);
// }
// }
// }
// return crc;
//}

12
tests/sensor.py
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@ -17,7 +17,17 @@ class Sensor():
'T_SCD4x': 30013, \
'RH_SCD4x': 30014, \
'T_SHT4x_signed': 30015, \
'T_SCD4x_signed': 30016 }
'T_SCD4x_signed': 30016, \
'PM_mass_concentration_1.0': 30017, \
'PM_mass_concentration_2.5': 30018, \
'PM_mass_concentration_4.0': 30019, \
'PM_mass_concentration_10.0': 30020, \
'PM_number_concentration_0.5': 30021, \
'PM_number_concentration_1.0': 30022, \
'PM_number_concentration_2.5': 30023, \
'PM_number_concentration_4.0': 30024, \
'PM_number_concentration_10.0': 30025, \
'PM_typical_particle_size': 30026 }
holding_registers = { \
'LED_on': 40001, \
'LED_brightness': 40002, \