veles_labs/iaq_sensor_wired
2
0
Fork 0
Code Issues 6 Pull Requests Projects Releases Wiki Activity

Merged scd4x_minimal

Browse Source
This commit is contained in:
dooku 2021-07-18 10:53:19 +02:00
commit 1f3c77ae08
14 changed files with 134942 additions and 116 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

BIN
Enclosure/IAQ_Sensor_Enclosure.FCStd Normal file
View File

Binary file not shown.

BIN
Enclosure/IAQ_Sensor_Enclosure.FCStd1 Normal file
View File

Binary file not shown.

BIN
Enclosure/STLs/Bottom_rev0.stl Normal file
View File

Binary file not shown.

BIN
Enclosure/STLs/Top_rev0.stl Normal file
View File

Binary file not shown.

134767
PCB/Project_Outputs/3D_MODEL/iaq_wired_sensor.step Normal file
View File

File diff suppressed because it is too large Load Diff

2
PCB/iaq_wired_sensor.pro
View File

@ -1,4 +1,4 @@
update=St 3. března 2021, 12:32:50
update=Thu 17 Jun 2021 08:18:44 AM CEST
version=1
last_client=kicad
[general]

2
fw/.cproject
View File

@ -65,7 +65,7 @@
<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.option.debuglevel.1650648268" name="Debug level" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.option.debuglevel" useByScannerDiscovery="false" value="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.option.debuglevel.value.g3" valueType="enumerated"/>
<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.option.optimization.level.622042" name="Optimization level" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.option.optimization.level" useByScannerDiscovery="false" value="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.option.optimization.level.value.os" valueType="enumerated"/>
<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.option.optimization.level.622042" name="Optimization level" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.option.optimization.level" useByScannerDiscovery="false" value="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.option.optimization.level.value.o0" valueType="enumerated"/>
<option IS_BUILTIN_EMPTY="false" IS_VALUE_EMPTY="false" id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.option.definedsymbols.2027210563" name="Define symbols (-D)" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.option.definedsymbols" useByScannerDiscovery="false" valueType="definedSymbols">

2
fw/Core/Inc/main.h
View File

@ -49,7 +49,7 @@ extern "C" {
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include "i2c.h"
#include "sht4x.h"
#include "scd4x.h"
/* USER CODE END Includes */
/* Exported types ------------------------------------------------------------*/

57
fw/Core/Inc/scd4x.h Normal file
View File

@ -0,0 +1,57 @@
/*
* sht4x.h
*
* Created on: Jun 8, 2021
* Author: user
*/
#ifndef INC_SHT4X_H_
#define INC_SHT4X_H_
#include "stdint.h"
#include "stm32l0xx_ll_i2c.h"
#include "stm32l0xx_ll_utils.h"
#include "i2c.h"
#include "crc8.h"
/*
* Defines & macros
*/
#define SCD4X_I2C_ADDRESS 0x62
/*
* Return values
*/
#define SCD4X_OK 0
#define SCD4X_ERROR -1 // generic error
#define SCD4X_CRC8_ERROR -2 // checksum failed
/*
* Data types
*/
typedef enum {
START_PERIODIC_MEASUREMENT = 0x21B1,
READ_MEASUREMENT = 0xEC05,
STOP_PERIODIC_MEASUREMENT = 0x3F86,
GET_DATA_READY_STATUS = 0xe4b8,
PERFORM_FACTORY_RESET = 0x3632
} scd4x_cmd_t;
/*
* Function prototypes
*/
int8_t scd4x_send_cmd(scd4x_cmd_t cmd);
int8_t scd4x_read_data(uint8_t *buffer, int len);
int8_t scd4x_start_periodic_measurement( void );
int8_t scd4x_stop_periodic_measurement( void );
int8_t scd4x_perform_factory_reset( void );
int8_t scd4x_read_measurement(int * co2, int *temperature, int *relative_humidity);
#endif /* INC_SHT4X_H_ */

57
fw/Core/Inc/sht4x.h
View File

@ -1,57 +0,0 @@
/*
* sht4x.h
*
* Created on: Jun 8, 2021
* Author: user
*/
#ifndef INC_SHT4X_H_
#define INC_SHT4X_H_
#include "stdint.h"
#include "stm32l0xx_ll_i2c.h"
#include "stm32l0xx_ll_utils.h"
#include "i2c.h"
#include "crc8.h"
/*
* Defines & macros
*/
#define SHT4X_I2C_ADDRESS 0x44
/*
* Return values
*/
#define SHT4X_OK 0
#define SHT4X_ERROR -1 // generic error
#define SHT4X_CRC8_ERROR -2 // checksum failed
/*
* Data types
*/
typedef enum {
START_MEAS_HIGH_PRECISION = 0xFD,
START_MEAS_MEDIUM_PRECISION = 0xF6,
START_MEAS_LOW_PRECISION = 0xE0,
READ_SERIAL = 0x89,
SOFT_RESET = 0x94,
HEATER_200_mW_1_s = 0x39,
HEATER_200_mW_01_s = 0x32,
HEATER_110_mW_1_s = 0x2F,
HEATER_110_mW_01_s = 0x24,
HEATER_20_mW_1_s = 0x1E,
HEATER_20_mW_01_s = 0x15
} sht4x_cmd_t;
/*
* Function prototypes
*/
int8_t sht4x_send_cmd(sht4x_cmd_t cmd);
int8_t sht4x_read_data(uint8_t *buffer, int len);
int8_t sht4x_measure(int *temperature, int *relative_humidity);
#endif /* INC_SHT4X_H_ */

2
fw/Core/Src/i2c.c
View File

@ -21,7 +21,7 @@ int i2c_init(i2c_context_t *context)
int i2c_transmit(uint8_t address, uint8_t *buffer, int len)
{
LL_I2C_HandleTransfer(i2c_context->i2c, address, LL_I2C_ADDRSLAVE_7BIT, len,
LL_I2C_MODE_AUTOEND, LL_I2C_GENERATE_START_WRITE);
LL_I2C_MODE_AUTOEND, LL_I2C_GENERATE_START_WRITE);
int i = 0;
// Autoend mode will raise STOP flag if NACK is detected
// (or if desired number of bytes is transmitted)

12
fw/Core/Src/main.c
View File

@ -108,6 +108,12 @@ int main(void)
/* Infinite loop */
/* USER CODE BEGIN WHILE */
uint8_t uart_data_dummy = 0;
//scd4x_perform_factory_reset();
//LL_mDelay(2000);
scd4x_start_periodic_measurement();
LL_mDelay(2000);
int CO2, T_SCD4x, RH_SCD4x;
int T_SHT4x, RH_SHT4x;
while (1)
{
/* RS485 test */
@ -116,8 +122,10 @@ int main(void)
uart_data_dummy++;
/* SHT41 measurement */
int T, RH;
sht4x_measure(&T, &RH);
sht4x_measure(&T_SHT4x, &RH_SHT4x);
/* SCD4x measurement */
scd4x_read_measurement(&CO2, &T_SCD4x, &RH_SCD4x);
LL_mDelay(1000);
/* USER CODE END WHILE */

104
fw/Core/Src/scd4x.c Normal file
View File

@ -0,0 +1,104 @@
/*
* sht4x.c
*
* Created on: Jun 8, 2021
* Author: user
*/
#include "scd4x.h"
int8_t scd4x_send_cmd(scd4x_cmd_t cmd)
{
uint8_t buffer[32];
int result;
// start measurement
buffer[0] = cmd >> 8;
buffer[1] = cmd & 0x00ff;
result = i2c_transmit(SCD4X_I2C_ADDRESS<<1, buffer, 2);
if (result != I2C_OK) {
return SCD4X_ERROR;
}
return SCD4X_OK;
}
int8_t scd4x_read_data(uint8_t *buffer, int len)
{
}
int8_t scd4x_start_periodic_measurement( void )
{
return scd4x_send_cmd(START_PERIODIC_MEASUREMENT);
}
int8_t scd4x_stop_periodic_measurement( void )
{
return scd4x_send_cmd(STOP_PERIODIC_MEASUREMENT);
}
int8_t scd4x_perform_factory_reset( void )
{
return scd4x_send_cmd(PERFORM_FACTORY_RESET);
}
int8_t scd4x_read_measurement(int * co2, int *temperature, int *relative_humidity)
{
uint8_t buffer[32];
int result;
// start measurement
// TODO: Check for data ready
/*
buffer[0] = GET_DATA_READY_STATUS >> 8;
buffer[1] = GET_DATA_READY_STATUS & 0x00ff;
result = i2c_transmit(SCD4X_I2C_ADDRESS<<1, buffer, 2);
if (result != I2C_OK) {
return SCD4X_ERROR;
}
LL_mDelay(100); // 10 ms should be enough
// read out
result = i2c_receive(SCD4X_I2C_ADDRESS<<1, buffer, 6);
if (result != I2C_OK) {
return SCD4X_ERROR;
}*/
// start measurement
buffer[0] = READ_MEASUREMENT >> 8;
buffer[1] = READ_MEASUREMENT & 0x00ff;
result = i2c_transmit(SCD4X_I2C_ADDRESS<<1, buffer, 2);
// TODO: Proc to vraci NACK? Vyresit.
/*if (result != I2C_OK) {
return SCD4X_ERROR;
}*/
LL_mDelay(1); // 10 ms should be enough
// read out
result = i2c_receive(SCD4X_I2C_ADDRESS<<1, buffer, 9);
if (result != I2C_OK)
{
return SCD4X_ERROR;
}
// TODO checksum
// Convert to T and RH; taken directly from pseudocode in SHT4x datasheet, page 3
uint32_t co2_ticks = (buffer[0] << 8) + buffer[1];
uint32_t t_ticks = (buffer[3] << 8) + buffer[4];
uint32_t rh_ticks = (buffer[6] << 8) + buffer[7];
int t_degC = -45 + 175 * t_ticks / 65535;
int rh_pRH = 100 * rh_ticks / 65535;
if (rh_pRH > 100) {
rh_pRH = 100;
}
if (rh_pRH < 0) {
rh_pRH = 0;
}
*co2 = co2_ticks;
*temperature = t_degC;
*relative_humidity = rh_pRH;
return SCD4X_OK;
}

53
fw/Core/Src/sht4x.c
View File

@ -1,53 +0,0 @@
/*
* sht4x.c
*
* Created on: Jun 8, 2021
* Author: user
*/
#include "sht4x.h"
int8_t sht4x_send_cmd(sht4x_cmd_t cmd)
{
}
int8_t sht4x_read_data(uint8_t *buffer, int len)
{
}
int8_t sht4x_measure(int *temperature, int *relative_humidity)
{
uint8_t buffer[32];
int result;
// start measurement
buffer[0] = START_MEAS_HIGH_PRECISION;
result = i2c_transmit(SHT4X_I2C_ADDRESS<<1, buffer, 1);
if (result != I2C_OK) {
return SHT4X_ERROR;
}
LL_mDelay(100); // 10 ms should be enough
// read out
result = i2c_receive(SHT4X_I2C_ADDRESS<<1, buffer, 6);
if (result != I2C_OK) {
return SHT4X_ERROR;
}
// TODO checksum
// Convert to T and RH; taken directly from pseudocode in SHT4x datasheet, page 3
uint32_t t_ticks = (buffer[0] << 8) + buffer[1];
uint32_t rh_ticks = (buffer[3] << 8) + buffer[4];
int t_degC = -45 + 175 * t_ticks / 65535;
int rh_pRH = -6 + 125 * rh_ticks / 65535;
if (rh_pRH > 100) {
rh_pRH = 100;
}
if (rh_pRH < 0) {
rh_pRH = 0;
}
*temperature = t_degC;
*relative_humidity = rh_pRH;
return SHT4X_OK;
}