How to display the value of GPIO_ReadPin quickly and correctly on STM32F103C8T6 ?
Dear Members,
How can the speed of displaying the value of HAL_GPIO_ReadPin when reading a pwm signal be equivalent to the speed of displaying the value in another variable located outside WHILE ?
I made a code to read the pwm signal to find out whether the pwm signal is in high mode or low mode using HAL_GPIO_ReadPin. When mode is high it will send a value of 1 and when mode is low it will send a value of 0.
I tested it by reading a 1Hz frequency which has a duty cycle that changes every second starting from 10%, 30%, 50% and I set a delay of 100ms on WHILE.
When I looked at the code output with UART, I saw that the time value in high mode for each duty cycle that the program read was correct.
However, the number of values 1 appearing when reading one duty cycle does not correspond to the size of the duty cycle being read. Here are the results of the code output:
DUTY CYCLE 10%
[10:01:46:124] 1C | Ton_ms: 00099.90 | Ton_us: 99899.98 ␍␊
[10:01:46:225] 1C | Ton_ms: 00099.90 | Ton_us: 99899.98 ␍␊
[10:01:46:326] 1C | Ton_ms: 00099.90 | Ton_us: 99899.98 ␍␊
[10:01:46:427] 0C | Ton_ms: 00099.90 | Ton_us: 99899.98 ␍␊
[10:01:46:528] 0C | Ton_ms: 00099.90 | Ton_us: 99899.98 ␍␊
[10:01:46:629] 0C | Ton_ms: 00099.90 | Ton_us: 99899.98 ␍␊
[10:01:46:730] 0C | Ton_ms: 00099.90 | Ton_us: 99899.98 ␍␊
[10:01:46:831] 0C | Ton_ms: 00099.90 | Ton_us: 99899.98 ␍␊
[10:01:46:932] 0C | Ton_ms: 00099.90 | Ton_us: 99899.98 ␍␊
[10:01:47:033] 0C | Ton_ms: 00099.90 | Ton_us: 99899.98 ␍␊
DUTY CYCLE 30%
[10:01:47:134] 1C | Ton_ms: 00299.92 | Ton_us: 299922.22 ␍␊
[10:01:47:235] 1C | Ton_ms: 00299.92 | Ton_us: 299922.22 ␍␊
[10:01:47:336] 1C | Ton_ms: 00299.92 | Ton_us: 299922.22 ␍␊
[10:01:47:437] 1C | Ton_ms: 00299.92 | Ton_us: 299922.22 ␍␊
[10:01:47:538] 1C | Ton_ms: 00299.92 | Ton_us: 299922.22 ␍␊
[10:01:47:639] 0C | Ton_ms: 00299.92 | Ton_us: 299922.22 ␍␊
[10:01:47:740] 0C | Ton_ms: 00299.92 | Ton_us: 299922.22 ␍␊
[10:01:47:841] 0C | Ton_ms: 00299.92 | Ton_us: 299922.22 ␍␊
[10:01:47:942] 0C | Ton_ms: 00299.92 | Ton_us: 299922.22 ␍␊
[10:01:48:043] 0C | Ton_ms: 00299.92 | Ton_us: 299922.22 ␍␊
DUTY CYCLE 50%
[10:01:48:144] 1C | Ton_ms: 00499.94 | Ton_us: 499944.41 ␍␊
[10:01:48:245] 0C | Ton_ms: 00499.94 | Ton_us: 499944.41 ␍␊
[10:01:48:346] 0C | Ton_ms: 00499.94 | Ton_us: 499944.41 ␍␊
[10:01:48:447] 0C | Ton_ms: 00499.94 | Ton_us: 499944.41 ␍␊
[10:01:48:548] 0C | Ton_ms: 00499.94 | Ton_us: 499944.41 ␍␊
[10:01:48:649] 0C | Ton_ms: 00499.94 | Ton_us: 499944.41 ␍␊
[10:01:48:750] 0C | Ton_ms: 00499.94 | Ton_us: 499944.41 ␍␊
[10:01:48:851] 0C | Ton_ms: 00499.94 | Ton_us: 499944.41 ␍␊
[10:01:48:952] 0C | Ton_ms: 00499.94 | Ton_us: 499944.41 ␍␊
[10:01:49:053] 0C | Ton_ms: 00499.94 | Ton_us: 499944.41 ␍␊
In the output display above, it is found that 1C is displayed as follows:
• Duty cycle 10% = 1C appears 3x
• Duty cycle 30% = 1C appears 5x
• Duty cycle 50% = 1C appears 1x
The output should display 1C as much as:
• Duty cycle 10% = 1C appears 1x
• Duty cycle 30% = 1C appears 3x
• Duty cycle 50% = 1C appears 5x
So, the appearance of the 1C status is not correct for every type of duty cycle that exists.
How do I ensure that the appearance of 1C matches each duty cycle reading that the code is reading?
This is the STM32CUBEIDE program that I made.
/* USER CODE BEGIN Header */
/**
******************************************************************************
* @file : main.c
* @brief : Main program body
******************************************************************************
* @attention
*
* Copyright (c) 2024 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"
#include "stdio.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 ---------------------------------------------------------*/
TIM_HandleTypeDef htim3;
UART_HandleTypeDef huart1;
/* USER CODE BEGIN PV */
uint32_t IC_direct_mode_periode = 0;
uint32_t IC_indirect_mode_Ton = 0;
uint32_t nilai_prescaler = 1999;
uint32_t untuk_rumus_frekuensi = 18000;
float untuk_rumus_waktu_Ton = 0.017998;
float duty_cycle = 0;
float frekuensi = 0;
float waktu_Ton_us = 0;
float waktu_Ton_ms = 0;
float waktu_Ton_s = 0;
char status[1000];
uint32_t status_pin3;
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_TIM3_Init(void);
static void MX_USART1_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 */
/* 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_TIM3_Init();
MX_USART1_UART_Init();
/* USER CODE BEGIN 2 */
HAL_TIM_IC_Start_IT(&htim3, TIM_CHANNEL_1);
HAL_TIM_IC_Start_IT(&htim3, TIM_CHANNEL_2);
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
//BACA SINYAL PWM 3 DI PIN A3
if (HAL_GPIO_ReadPin(GPIOA, GPIO_PIN_3) == GPIO_PIN_SET)
{
status_pin3 = 1;
}
if (HAL_GPIO_ReadPin(GPIOA, GPIO_PIN_3) == GPIO_PIN_RESET)
{
status_pin3 = 0;
}
/* USER CODE END WHILE */
sprintf(status, "%luC | Ton_ms: %08.2f | Ton_us: %08.2f \r\n", status_pin3, waktu_Ton_ms, waktu_Ton_us);
HAL_UART_Transmit_IT(&huart1, status, strlen(status));
frekuensi = 0;
duty_cycle = 0;
HAL_Delay(100);
}
/* USER CODE END 3 */
}
/**
* @brief System Clock Configuration
* @retval None
*/
void SystemClock_Config(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
/** Initializes the RCC Oscillators according to the specified parameters
* in the RCC_OscInitTypeDef structure.
*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
RCC_OscInitStruct.HSEState = RCC_HSE_ON;
RCC_OscInitStruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1;
RCC_OscInitStruct.HSIState = RCC_HSI_ON;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL9;
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_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK)
{
Error_Handler();
}
}
/**
* @brief TIM3 Initialization Function
* @PAram None
* @retval None
*/
static void MX_TIM3_Init(void)
{
/* USER CODE BEGIN TIM3_Init 0 */
/* USER CODE END TIM3_Init 0 */
TIM_ClockConfigTypeDef sClockSourceConfig = {0};
TIM_SlaveConfigTypeDef sSlaveConfig = {0};
TIM_MasterConfigTypeDef sMasterConfig = {0};
TIM_IC_InitTypeDef sConfigIC = {0};
/* USER CODE BEGIN TIM3_Init 1 */
/* USER CODE END TIM3_Init 1 */
htim3.Instance = TIM3;
htim3.Init.Prescaler = 0;
htim3.Init.CounterMode = TIM_COUNTERMODE_UP;
htim3.Init.Period = 65535;
htim3.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
htim3.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
if (HAL_TIM_Base_Init(&htim3) != HAL_OK)
{
Error_Handler();
}
sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
if (HAL_TIM_ConfigClockSource(&htim3, &sClockSourceConfig) != HAL_OK)
{
Error_Handler();
}
if (HAL_TIM_IC_Init(&htim3) != HAL_OK)
{
Error_Handler();
}
sSlaveConfig.SlaveMode = TIM_SLAVEMODE_RESET;
sSlaveConfig.InputTrigger = TIM_TS_TI1FP1;
sSlaveConfig.TriggerPolarity = TIM_INPUTCHANNELPOLARITY_RISING;
sSlaveConfig.TriggerFilter = 0;
if (HAL_TIM_SlaveConfigSynchro(&htim3, &sSlaveConfig) != HAL_OK)
{
Error_Handler();
}
sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
if (HAL_TIMEx_MasterConfigSynchronization(&htim3, &sMasterConfig) != HAL_OK)
{
Error_Handler();
}
sConfigIC.ICPolarity = TIM_INPUTCHANNELPOLARITY_RISING;
sConfigIC.ICSelection = TIM_ICSELECTION_DIRECTTI;
sConfigIC.ICPrescaler = TIM_ICPSC_DIV1;
sConfigIC.ICFilter = 0;
if (HAL_TIM_IC_ConfigChannel(&htim3, &sConfigIC, TIM_CHANNEL_1) != HAL_OK)
{
Error_Handler();
}
sConfigIC.ICPolarity = TIM_INPUTCHANNELPOLARITY_FALLING;
sConfigIC.ICSelection = TIM_ICSELECTION_INDIRECTTI;
if (HAL_TIM_IC_ConfigChannel(&htim3, &sConfigIC, TIM_CHANNEL_2) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN TIM3_Init 2 */
/* USER CODE END TIM3_Init 2 */
}
/**
* @brief USART1 Initialization Function
* @PAram None
* @retval None
*/
static void MX_USART1_UART_Init(void)
{
/* USER CODE BEGIN USART1_Init 0 */
/* USER CODE END USART1_Init 0 */
/* USER CODE BEGIN USART1_Init 1 */
/* USER CODE END USART1_Init 1 */
huart1.Instance = USART1;
huart1.Init.BaudRate = 115200;
huart1.Init.WordLength = UART_WORDLENGTH_8B;
huart1.Init.StopBits = UART_STOPBITS_1;
huart1.Init.Parity = UART_PARITY_NONE;
huart1.Init.Mode = UART_MODE_TX_RX;
huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;
huart1.Init.OverSampling = UART_OVERSAMPLING_16;
if (HAL_UART_Init(&huart1) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN USART1_Init 2 */
/* USER CODE END USART1_Init 2 */
}
/**
* @brief GPIO Initialization Function
* @PAram None
* @retval None
*/
static void MX_GPIO_Init(void)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
/* USER CODE BEGIN MX_GPIO_Init_1 */
/* USER CODE END MX_GPIO_Init_1 */
/* GPIO Ports Clock Enable */
__HAL_RCC_GPIOD_CLK_ENABLE();
__HAL_RCC_GPIOA_CLK_ENABLE();
/*Configure GPIO pins : Baca_Sinyal_3_XOR_Pin Baca_Sinyal_1_Pin Baca_Sinyal_2_Pin */
GPIO_InitStruct.Pin = Baca_Sinyal_3_XOR_Pin|Baca_Sinyal_1_Pin|Baca_Sinyal_2_Pin;
GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
GPIO_InitStruct.Pull = GPIO_NOPULL;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
/* USER CODE BEGIN MX_GPIO_Init_2 */
/* USER CODE END MX_GPIO_Init_2 */
}
/* USER CODE BEGIN 4 */
void HAL_TIM_IC_CaptureCallback(TIM_HandleTypeDef *htim)
{
if (htim->Channel == HAL_TIM_ACTIVE_CHANNEL_1)
{
//mendapatkan nilai input capture dari channel 1 yang merupakan direct mode untuk periode
IC_direct_mode_periode = HAL_TIM_ReadCapturedValue(htim, TIM_CHANNEL_1);
if (IC_direct_mode_periode != 0)
{
//mendapatkan nilai input capture dari channel 2 yang merupakan indirect mode untuk Ton
IC_indirect_mode_Ton = HAL_TIM_ReadCapturedValue(htim, TIM_CHANNEL_2);
//rumus frekuensi
frekuensi = (float) untuk_rumus_frekuensi / IC_direct_mode_periode;
if (frekuensi > 500) //jika frekuensi lebih dari 500Hz, maka
{
nilai_prescaler = 0; //ubah prescaler menjadi 0 untuk pembacaan frekuensi lebih tinggi
untuk_rumus_frekuensi = 36000000; //ubah rumus menjadi 36Mhz untuk pembacaan frekuensi lebih tinggi
untuk_rumus_waktu_Ton = 35.95; //ubah rumus menjadi 35.95 untuk pembacaan frekuensi lebih tinggi
}
else //jika frekuensi tidak lebih dari 500Hz, maka
{
nilai_prescaler = 1999; //ubah prescaler menjadi 1999 untuk pembacaan frekuensi lebih rendah
untuk_rumus_frekuensi = 18000; //ubah rumus menjadi 18Khz untuk pembacaan frekuensi lebih rendah
untuk_rumus_waktu_Ton = 0.017998; //ubah rumus menjadi 0.017998 untuk pembacaan frekuensi lebih rendah
}
TIM3->PSC = nilai_prescaler; //nilai prescaler akan sama dengan isi "nilai_prescaler"
//rumus duty cycle
duty_cycle = (float)(IC_indirect_mode_Ton * 100) / IC_direct_mode_periode;
//rumus waktu Ton "HIGH" dalam detik
waktu_Ton_us = IC_indirect_mode_Ton / untuk_rumus_waktu_Ton;
//rumus waktu Ton "HIGH" dalam milidetik
waktu_Ton_ms = waktu_Ton_us / 1000;
//rumus waktu Ton "HIGH" dalam mikrodetik
waktu_Ton_s = waktu_Ton_ms / 1000;
}
else
{
duty_cycle = 0;
frekuensi = 0;
waktu_Ton_us = 0;
waktu_Ton_ms = 0;
}
}
}
/* 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 */