Problem with I2C communication between NUCLEO-F042k6 and CO2 Sensor SCD30

[MPote.1]

I spend whole day traying establish communication between NUCLEO-F)42k6 and CO2 Sensor SCD30 https://www.sensirion.com/fileadmin/user_upload/customers/sensirion/Dokumente/9.5_CO2/Sensirion_CO2_Sensors_SCD30_Interface_Description.pdf

I have connected SDA line from Sensor to D2(PA12) on Nucleo and SCL from Sensor to D8(PF1).

GND from sensor connected to GND on Nucleo and VCC from sensor conected to 3.3 on Nucleo.

I'm using STM32 Workspace and in STM32CubeMX perspective I have configured GPIO pins like described above. Additionally I set No pull up and No pull down for SCL and SDA as it look like its done on sensor board by manufacurer. GPIO Mode Alternate Function Open Drain.

I'm receiving in putty terminal following output:

▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒-Buffer

▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒-Buffer

▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒-Buffer

▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒-Buffer

I will be appriciate for help with getting CO2, Huminidity and Temperature readings from this sensor. This is my beggining with STM32 and after whole day I haven't idea how to proceed with that. My code which require correction is below.

[MPote.1]

/* USER CODE BEGIN Header */
/**
 ******************************************************************************
 * @file : main.c
 * @brief : Main program body
 ******************************************************************************
 * @attention
 *
 * <h2><center>&copy; Copyright (c) 2020 STMicroelectronics.
 * All rights reserved.</center></h2>
 *
 * This software component is licensed by ST under BSD 3-Clause license,
 * the "License"; You may not use this file except in compliance with the
 * License. You may obtain a copy of the License at:
 * opensource.org/licenses/BSD-3-Clause
 *
 ******************************************************************************
 */
/* USER CODE END Header */
 
/* Includes ------------------------------------------------------------------*/
#include "main.h"
 
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
 
/* USER CODE END Includes */
 
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
 
/* USER CODE END PTD */
 
/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
 
/* USER CODE END PD */
 
/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
 
/* USER CODE END PM */
 
/* Private variables ---------------------------------------------------------*/
I2C_HandleTypeDef hi2c1;
 
UART_HandleTypeDef huart2;
 
/* USER CODE BEGIN PV */
 
/* USER CODE END PV */
 
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_USART2_UART_Init(void);
static void MX_I2C1_Init(void);
/* USER CODE BEGIN PFP */
 
/* USER CODE END PFP */
 
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
static const uint8_t TMP102_ADDR = 0x61 << 1; // Use 8-bit address
static const uint8_t REG_TEMP = 0x03;
/* USER CODE END 0 */
 
/**
 * @brief The application entry point.
 * @retval int
 */
int main(void)
{
 /* USER CODE BEGIN 1 */
 
 /* USER CODE END 1 */
 
 /* MCU Configuration--------------------------------------------------------*/
 
 /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
 HAL_Init();
 
 /* USER CODE BEGIN Init */
 HAL_StatusTypeDef ret;
 uint8_t buf[18]; //for received data
 uint8_t buf2[2]={0x03,0x00}; //read measurement command
 uint8_t buf3[4]={0x00,0x10,0x00,0x00}; //triger continous data
 
 
 /* USER CODE END Init */
 
 /* Configure the system clock */
 SystemClock_Config();
 
 /* USER CODE BEGIN SysInit */
 
 /* USER CODE END SysInit */
 
 /* Initialize all configured peripherals */
 MX_GPIO_Init();
 MX_USART2_UART_Init();
 MX_I2C1_Init();
 /* USER CODE BEGIN 2 */
 
 /* USER CODE END 2 */
 
 /* Infinite loop */
 /* USER CODE BEGIN WHILE */
 HAL_I2C_Master_Transmit(&hi2c1, TMP102_ADDR, buf3, 4, HAL_MAX_DELAY);
 while (1)
 {
 
	 // Tell TMP102 that we want to read from the temperature register
 
	 ret = HAL_I2C_Master_Transmit(&hi2c1, TMP102_ADDR, buf2, 2, HAL_MAX_DELAY);
	 if ( ret != HAL_OK ) {
	 strcpy((char*)buf, "Error Tx\r\n");
	 } else {
	 // Read 2 bytes from the temperature register
	 ret = HAL_I2C_Master_Receive(&hi2c1, TMP102_ADDR, buf, 18, HAL_MAX_DELAY);
	 if ( ret != HAL_OK ) {
	 strcpy((char*)buf, "Error Rx\r\n");
	 } else {
 
 
 
 
 
	 }
	 }
 
 
	 // Send out buffer (temperature or error message)
	 HAL_UART_Transmit(&huart2, buf, strlen((char*)buf), HAL_MAX_DELAY);
	 // Wait
	 HAL_Delay(500);
 
 
 
 
 
	 HAL_UART_Transmit(&huart2, "-Buffer\r\n", strlen(("-Buffer ")), HAL_MAX_DELAY);
	 // Wait
	 HAL_Delay(500);
 
 
 
	 /* USER CODE END WHILE */
 
 /* USER CODE BEGIN 3 */
 }
 /* USER CODE END 3 */
}
 
/**
 * @brief System Clock Configuration
 * @retval None
 */
void SystemClock_Config(void)
{
 RCC_OscInitTypeDef RCC_OscInitStruct = {0};
 RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
 RCC_PeriphCLKInitTypeDef PeriphClkInit = {0};
 
 /** Initializes the CPU, AHB and APB busses clocks 
 */
 RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
 RCC_OscInitStruct.HSIState = RCC_HSI_ON;
 RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
 RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
 if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
 {
 Error_Handler();
 }
 /** Initializes the CPU, AHB and APB busses clocks 
 */
 RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
 |RCC_CLOCKTYPE_PCLK1;
 RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI;
 RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
 RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
 
 if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0) != HAL_OK)
 {
 Error_Handler();
 }
 PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_I2C1;
 PeriphClkInit.I2c1ClockSelection = RCC_I2C1CLKSOURCE_HSI;
 if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)
 {
 Error_Handler();
 }
}
 
/**
 * @brief I2C1 Initialization Function
 * @param None
 * @retval None
 */
static void MX_I2C1_Init(void)
{
 
 /* USER CODE BEGIN I2C1_Init 0 */
 
 /* USER CODE END I2C1_Init 0 */
 
 /* USER CODE BEGIN I2C1_Init 1 */
 
 /* USER CODE END I2C1_Init 1 */
 hi2c1.Instance = I2C1;
 hi2c1.Init.Timing = 0x2000090E;
 hi2c1.Init.OwnAddress1 = 0;
 hi2c1.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
 hi2c1.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
 hi2c1.Init.OwnAddress2 = 0;
 hi2c1.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
 hi2c1.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
 hi2c1.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
 if (HAL_I2C_Init(&hi2c1) != HAL_OK)
 {
 Error_Handler();
 }
 /** Configure Analogue filter 
 */
 if (HAL_I2CEx_ConfigAnalogFilter(&hi2c1, I2C_ANALOGFILTER_ENABLE) != HAL_OK)
 {
 Error_Handler();
 }
 /** Configure Digital filter 
 */
 if (HAL_I2CEx_ConfigDigitalFilter(&hi2c1, 0) != HAL_OK)
 {
 Error_Handler();
 }
 /* USER CODE BEGIN I2C1_Init 2 */
 
 /* USER CODE END I2C1_Init 2 */
 
}
 
/**
 * @brief USART2 Initialization Function
 * @param None
 * @retval None
 */
static void MX_USART2_UART_Init(void)
{
 
 /* USER CODE BEGIN USART2_Init 0 */
 
 /* USER CODE END USART2_Init 0 */
 
 /* USER CODE BEGIN USART2_Init 1 */
 
 /* USER CODE END USART2_Init 1 */
 huart2.Instance = USART2;
 huart2.Init.BaudRate = 38400;
 huart2.Init.WordLength = UART_WORDLENGTH_8B;
 huart2.Init.StopBits = UART_STOPBITS_1;
 huart2.Init.Parity = UART_PARITY_NONE;
 huart2.Init.Mode = UART_MODE_TX_RX;
 huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE;
 huart2.Init.OverSampling = UART_OVERSAMPLING_16;
 huart2.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
 huart2.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
 if (HAL_UART_Init(&huart2) != HAL_OK)
 {
 Error_Handler();
 }
 /* USER CODE BEGIN USART2_Init 2 */
 
 /* USER CODE END USART2_Init 2 */
 
}
 
/**
 * @brief GPIO Initialization Function
 * @param None
 * @retval None
 */
static void MX_GPIO_Init(void)
{
 GPIO_InitTypeDef GPIO_InitStruct = {0};
 
 /* GPIO Ports Clock Enable */
 __HAL_RCC_GPIOF_CLK_ENABLE();
 __HAL_RCC_GPIOA_CLK_ENABLE();
 __HAL_RCC_GPIOB_CLK_ENABLE();
 
 /*Configure GPIO pin Output Level */
 HAL_GPIO_WritePin(LD3_GPIO_Port, LD3_Pin, GPIO_PIN_RESET);
 
 /*Configure GPIO pin : LD3_Pin */
 GPIO_InitStruct.Pin = LD3_Pin;
 GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
 GPIO_InitStruct.Pull = GPIO_NOPULL;
 GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
 HAL_GPIO_Init(LD3_GPIO_Port, &GPIO_InitStruct);
 
}
 
/* USER CODE BEGIN 4 */
 
/* USER CODE END 4 */
 
/**
 * @brief This function is executed in case of error occurrence.
 * @retval None
 */
void Error_Handler(void)
{
 /* USER CODE BEGIN Error_Handler_Debug */
 /* User can add his own implementation to report the HAL error return state */
 
 /* USER CODE END Error_Handler_Debug */
}
 
#ifdef USE_FULL_ASSERT
/**
 * @brief Reports the name of the source file and the source line number
 * where the assert_param error has occurred.
 * @param file: pointer to the source file name
 * @param line: assert_param error line source number
 * @retval None
 */
void assert_failed(char *file, uint32_t line)
{ 
 /* USER CODE BEGIN 6 */
 /* User can add his own implementation to report the file name and line number,
 tex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
 /* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */
 
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

[sanctified]

Hi, I have worked with the SCD30 before.

Did u solve the problem?

[VVAN .1]

I also have an issue likely, so you can post full code that sensor worked. Thank you very much

[MPote.1]

Hi, yes I have solve the problem. When I will find a time I will put working code for it (It not beautiful to learn from, but at least some working example to start to improve).

[GTolk.1]

Hi,

it looks like i have the same problem with the communication as you. It would be great if you could post your code. maybe then i will find the mistake i made.

[MPote.1]

Hi, below you can find some code which is working for me. I'm not programmer - just find idea to rewrite some arduino library (it's not example for learn but at least something working). You need to set also option in compiler to have possibility to use float variables in your programs. Let me know is it help you somehow

[RShiv.1]

Hi ,

I have been trying to use the SCD30 for STM32F103C6T6..but not getting any I2c data ..

also tried the same with Disco board ST25R3911B..let me know if you have any suggestion on this ...will really help..

[VVAN .1]

I also have an issue likely, so you can post full code that sensor worked. Thank you very much!

[MPote.1]

Hi, code is posted above. You can download it by click on them :)

[VVAN .1]

I used your code but it not operated. You can describe a detail your process with the sensor or attached file . Thank you very much!

[OZera.1]

Hi, this code worked for me, maybe you can try it and send me back

https://github.com/Ons-zerai/Sending-SCD30-sensor-data-to-a-network-server-via-LoRaWAN-protocol-

Best regards

Ons

[RShiv.1]

Hi,

Thanks for your reply...I am using CubeMx to generate the .c code..looks like there is some I2C communication issue..have been trying to do even bitbang code..but not finding any solution.

I have attached the code..have a look and let me know anything needs to be changed.

regards

Ravi

[RShiv.1]

I am also using SCD30 interface for the same....even the address all looks fine..let me know any change in code is required..more to do with what lower level I2C interface gives as output...

[RShiv.1]

I think you have not used STM32 controller where it does I2C communication to achieve this..

Let me know if you get any pointers.

[RShiv.1]

Hi Ozera,

It looks like you also have SCD30 connected to STM32...can I know which cubeMx version you used to generate the I2C HAL..because we have tried almost all but none is working..

Kindly let me know.

Thanks

Ravi

[S.Ma]

I used SGP30-2.5k sensor without issue with bitbang. Some other sensord from the vendor are not true I2C slaves and special pseudo I2C bit bang sourcs to fill is provided...