2022-12-01 02:54 AM
Hello Folks,
I have connected my STML011G4U7 with ISO7816. In my code I am parsing ATR which is an 8 byte array and sending it. Here I need to measure the voltage from ADC which would be (3.3 V) and store it in the last two bytes of an array. How will I do that?
byte ATR[] = { 0x3B, 0x06, 0x55, 0x63, 0x63, 0x3D, 0x00, 0x00 };
I need to store the value coming from ADC in the last two bytes ADCH and ADCL. How will I do that?
2022-12-02 02:23 AM
Thanks for the info Peter. I did include the caibration start in my code and defined the VREFINT_CAL. now where i would be able to see the value of VREFINT_CAL
2022-12-02 02:28 AM
You do not have to display or see the value of VREFINT_CAL, but only use it for the calculation.
Did you read the section in RM0377? It says how to convert the ADC value to the measurement result.
2022-12-02 02:32 AM
Yes I did check.
The following formula gives the actual VDDA voltage supplying the device:
VDDA = VDDA_Charac x VREFINT_CAL / VREFINT_DATA
In my case VDDA_Charac = 3 volt , VREFINT_DATA the raw value i am getting is 1024. How will I figure out the VREFINT_CAL?
2022-12-02 02:49 AM
You have already defined VREFINT_CAL, so you only have to insert it into your programme. The only constant is VDDA_Charac with the value 3V, VREFINT_DATA is a variable and VREFINT_CAL is an address from which the value is fetched by the programme.
2022-12-02 04:17 AM
Hi Peter. I have tried to put that in my code but it's giving syntax error
void ReadVCC(byte ATR[])
{
HAL_ADCEx_Calibration_Start(&hadc, ADC_SINGLE_ENDED);
HAL_ADC_Start_IT(&hadc);
HAL_ADC_PollForConversion(&hadc, HAL_MAX_DELAY);
adcval = HAL_ADC_GetValue(&hadc);
VDDA = 3.3 * (VREFINT_CAL / adcval);
ATR[6] = (uint8_t) (adcval>>8); // MSB
ATR[7] = (uint8_t) (adcval & 0x00FF); // LSB
HAL_ADC_Stop(&hadc);
}
2022-12-02 04:19 AM
Error : ../Core/Src/main.c:121:30: error: invalid operands to binary / (have 'uint16_t *' {aka 'short unsigned int *'} and 'int')
These are the macros :
typedef unsigned char byte;
byte ATR[] = { 0x3B, 0x06, 0x55, 0x63, 0x63, 0x3D, 0x00, 0x00 };
uint16_t adcval;
uint32_t VDDA;
#define VREFINT_CAL_ADDR 0x1FF80078 /* datasheet p. 19 */
#define VREFINT_CAL ((uint16_t*) VREFINT_CAL_ADDR
2022-12-02 06:15 AM
Have you ever made measurements with the ADC?
Do you know the firmware library, e.g. Projects\NUCLEO-L011K4\Examples\ADC, which contains many examples of how to use the different peripheral units?
Regards
/Peter
2022-12-02 06:35 AM
Hi Peter, This is the first time I am writing a code. it would be good if you guide me how to get a rawadc val as I am getting just 1 Idk why.
also Do I need to select the VREFINT_channel as well along with the ADC pin?
2022-12-02 07:05 AM
/* USER CODE BEGIN Header */
/**
******************************************************************************
* @file : main.c
* @brief : Main program body
******************************************************************************
* @attention
*
* Copyright (c) 2022 STMicroelectronics.
* All rights reserved.
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
*/
/* 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 ---------------------------------------------------------*/
ADC_HandleTypeDef hadc;
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_ADC_Init(void);
static void MX_USART2_UART_Init(void);
/* USER CODE BEGIN PFP */
/* USER CODE END PFP */
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
/* USER CODE END 0 */
/**
* @brief The application entry point.
* @retval int
*/
int main(void)
{
/* USER CODE BEGIN 1 */
typedef unsigned char byte;
byte ATR[] = { 0x3B, 0x06, 0x55, 0x63, 0x63, 0x3D, 0x00, 0x00 };
uint16_t adcval;
uint16_t VDDA;
#define VREFINT_CAL_ADDR 0x1FF80078 // datasheet p. 19
#define VREF 3000 // voltage reference 3V
uint16_t vrefint_cal; // VREFINT calibration value
vrefint_cal = *((uint16_t*) VREFINT_CAL_ADDR); // read VREFINT_CAL_ADDR memory location
/* USER CODE END 1 */
/* MCU Configuration--------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* USER CODE BEGIN Init */
/* 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_ADC_Init();
MX_USART2_UART_Init();
/* USER CODE BEGIN 2 */
void ISO7816_SendATR(void)
{
HAL_UART_Transmit(&huart2, (byte*)ATR, sizeof(ATR), 20);
__HAL_UART_CLEAR_FEFLAG(&huart2);
__HAL_UART_CLEAR_OREFLAG(&huart2);
byte Dummy;
while (__HAL_UART_GET_FLAG(&huart2, UART_FLAG_RXNE))
HAL_UART_Receive(&huart2, &Dummy, 1, 1);
}
void ADC_Calibration(void)
{
if (HAL_ADCEx_Calibration_Start(&hadc, ADC_SINGLE_ENDED) != HAL_OK)
{
/* Calibration Error */
Error_Handler();
}
}
void ReadVCC(byte ATR[])
{
HAL_ADC_Start_IT(&hadc);
HAL_ADC_PollForConversion(&hadc, HAL_MAX_DELAY);
adcval = HAL_ADC_GetValue(&hadc);
VDDA = VREF * (vrefint_cal / adcval);
ATR[6] = (uint8_t) (VDDA>>8); // MSB
ATR[7] = (uint8_t) (VDDA & 0x00FF); // LSB
}
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
ADC_Calibration();
ISO7816_SendATR();
ReadVCC(ATR);
HAL_ADC_Stop(&hadc);
/* 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};
/** Configure the main internal regulator output voltage
*/
__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
/** Initializes the RCC Oscillators according to the specified parameters
* in the RCC_OscInitTypeDef structure.
*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_MSI;
RCC_OscInitStruct.MSIState = RCC_MSI_ON;
RCC_OscInitStruct.MSICalibrationValue = 0;
RCC_OscInitStruct.MSIClockRange = RCC_MSIRANGE_5;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
Error_Handler();
}
/** Initializes the CPU, AHB and APB buses clocks
*/
RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
|RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_MSI;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0) != HAL_OK)
{
Error_Handler();
}
PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_USART2;
PeriphClkInit.Usart2ClockSelection = RCC_USART2CLKSOURCE_PCLK1;
if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)
{
Error_Handler();
}
}
/**
* @brief ADC Initialization Function
* @param None
* @retval None
*/
static void MX_ADC_Init(void)
{
/* USER CODE BEGIN ADC_Init 0 */
/* USER CODE END ADC_Init 0 */
ADC_ChannelConfTypeDef sConfig = {0};
/* USER CODE BEGIN ADC_Init 1 */
/* USER CODE END ADC_Init 1 */
/** Configure the global features of the ADC (Clock, Resolution, Data Alignment and number of conversion)
*/
hadc.Instance = ADC1;
hadc.Init.OversamplingMode = DISABLE;
hadc.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV1;
hadc.Init.Resolution = ADC_RESOLUTION_12B;
hadc.Init.SamplingTime = ADC_SAMPLETIME_1CYCLE_5;
hadc.Init.ScanConvMode = ADC_SCAN_DIRECTION_FORWARD;
hadc.Init.DataAlign = ADC_DATAALIGN_RIGHT;
hadc.Init.ContinuousConvMode = DISABLE;
hadc.Init.DiscontinuousConvMode = DISABLE;
hadc.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
hadc.Init.ExternalTrigConv = ADC_SOFTWARE_START;
hadc.Init.DMAContinuousRequests = DISABLE;
hadc.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
hadc.Init.Overrun = ADC_OVR_DATA_PRESERVED;
hadc.Init.LowPowerAutoWait = DISABLE;
hadc.Init.LowPowerFrequencyMode = ENABLE;
hadc.Init.LowPowerAutoPowerOff = DISABLE;
if (HAL_ADC_Init(&hadc) != HAL_OK)
{
Error_Handler();
}
/** Configure for the selected ADC regular channel to be converted.
*/
sConfig.Channel = ADC_CHANNEL_8;
sConfig.Rank = ADC_RANK_CHANNEL_NUMBER;
if (HAL_ADC_ConfigChannel(&hadc, &sConfig) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN ADC_Init 2 */
/* USER CODE END ADC_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 = 13441;
huart2.Init.WordLength = UART_WORDLENGTH_9B;
huart2.Init.StopBits = UART_STOPBITS_2;
huart2.Init.Parity = UART_PARITY_EVEN;
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_HalfDuplex_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 Ports Clock Enable */
__HAL_RCC_GPIOA_CLK_ENABLE();
__HAL_RCC_GPIOB_CLK_ENABLE();
}
/* 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 */
__disable_irq();
while (1)
{
}
/* 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(uint8_t *file, uint32_t line)
{
/* USER CODE BEGIN 6 */
/* User can add his own implementation to report the file name and line number,
ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
/* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */
Hi Peter. Kindly check my code and let me know in case of any corrections
2022-12-02 11:43 AM
Huh? Rather:
# define VREFINT_CAL (*(uint16_t *)0x1FF80078)
:)