DMX512 decoder: unable to get falling and rising edge using interrupt in input capture mode

[ISHA]

 details:

using Timer 1 with channel 1 and channel 2 for falling and rising edge, and detect break MAB and data frame.

code:

/* USER CODE BEGIN Header */

/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"

/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include <stdio.h>
/* 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 hadc1;

TIM_HandleTypeDef htim1;
TIM_HandleTypeDef htim3;

UART_HandleTypeDef huart1;
UART_HandleTypeDef huart2;

/* USER CODE BEGIN PV */

uint32_t GlobalOverflowCount = 0;
uint32_t BreakOverflowCount = 0;
uint32_t TimingCounterRx = 0;
uint32_t MABRisingCounterRx = 0;
uint32_t BreakFallingCounterRx = 0;
uint32_t NextBreakFallingCounterRx = 0;
uint8_t DMXChannelCount = 0;
uint8_t PacketFlag = 0;
uint8_t InitBreakFlagRX = 0;
uint8_t DataCorruptFlag = 0;
uint8_t MABFlag = 0;
uint8_t BreakFlag = 0;
uint8_t dmxBuffer[512]; // DMX data buffer for 512 channels
int dmxDataReady = 0;
#define MAB_TIME 12 // Example value, adjust as needed
#define BREAK_TIME 88 // Example value, adjust as needed
#define DMX_PACKET_TIME 500 // Example value, adjust as needed

/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_ADC1_Init(void);
static void MX_TIM1_Init(void);
static void MX_TIM3_Init(void);
static void MX_USART1_UART_Init(void);
static void MX_USART2_UART_Init(void);
/* USER CODE BEGIN PFP */
void ProcessDMXPacket(void);
/* USER CODE END PFP */

/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */

/* USER CODE END 0 */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_ADC1_Init();
MX_TIM1_Init();
MX_TIM3_Init();
// MX_USART1_UART_Init();
// MX_USART2_UART_Init();
/* USER CODE BEGIN 2 */
// Start timers for input capture and PWM
HAL_TIM_IC_Start_IT(&htim1, TIM_CHANNEL_1); // Falling edge on PA0
HAL_TIM_IC_Start_IT(&htim1, TIM_CHANNEL_2); // Rising edge on PA1
// HAL_TIM_PWM_Start(&htim3, TIM_CHANNEL_1); // PWM on PA6


// HAL_UART_Receive_IT(&huart1, dmxBuffer, 512);
/* USER CODE END 2 */

/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
if (PacketFlag) {
// Process received DMX512 packet
ProcessDMXPacket();
PacketFlag = 0; // Reset after processing
}
/* 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};

/** Initializes the RCC Oscillators according to the specified parameters
* in the RCC_OscInitTypeDef structure.
*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
RCC_OscInitStruct.HSIState = RCC_HSI_ON;
RCC_OscInitStruct.HSIDiv = RCC_HSI_DIV1;
RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
Error_Handler();
}

RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
|RCC_CLOCKTYPE_PCLK1;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI;
RCC_ClkInitStruct.SYSCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.AHBCLKDivider = RCC_HCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_APB1_DIV2;

if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK)
{
Error_Handler();
}
}

/**
* @brief ADC1 Initialization Function
*  None
* @retval None
*/
static void MX_ADC1_Init(void)
{

/* USER CODE BEGIN ADC1_Init 0 */

/* USER CODE END ADC1_Init 0 */

ADC_ChannelConfTypeDef sConfig = {0};

/* USER CODE BEGIN ADC1_Init 1 */

/* USER CODE END ADC1_Init 1 */

/** Configure the global features of the ADC (Clock, Resolution, Data Alignment and number of conversion)
*/
hadc1.Instance = ADC1;
hadc1.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV2;
hadc1.Init.Resolution = ADC_RESOLUTION_12B;
hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;
hadc1.Init.ScanConvMode = ADC_SCAN_DISABLE;
hadc1.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
hadc1.Init.LowPowerAutoWait = DISABLE;
hadc1.Init.LowPowerAutoPowerOff = DISABLE;
hadc1.Init.ContinuousConvMode = DISABLE;
hadc1.Init.NbrOfConversion = 1;
hadc1.Init.DiscontinuousConvMode = DISABLE;
hadc1.Init.ExternalTrigConv = ADC_SOFTWARE_START;
hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
hadc1.Init.DMAContinuousRequests = DISABLE;
hadc1.Init.Overrun = ADC_OVR_DATA_PRESERVED;
hadc1.Init.SamplingTimeCommon1 = ADC_SAMPLETIME_1CYCLE_5;
hadc1.Init.SamplingTimeCommon2 = ADC_SAMPLETIME_1CYCLE_5;
hadc1.Init.OversamplingMode = DISABLE;
hadc1.Init.TriggerFrequencyMode = ADC_TRIGGER_FREQ_HIGH;
if (HAL_ADC_Init(&hadc1) != HAL_OK)
{
Error_Handler();
}

/** Configure Regular Channel
*/
sConfig.Channel = ADC_CHANNEL_4;
sConfig.Rank = ADC_REGULAR_RANK_1;
sConfig.SamplingTime = ADC_SAMPLINGTIME_COMMON_1;
if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN ADC1_Init 2 */

/* USER CODE END ADC1_Init 2 */

}


static void MX_TIM1_Init(void)
{

/* USER CODE BEGIN TIM1_Init 0 */

/* USER CODE END TIM1_Init 0 */

TIM_ClockConfigTypeDef sClockSourceConfig = {0};
TIM_MasterConfigTypeDef sMasterConfig = {0};
TIM_IC_InitTypeDef sConfigIC = {0};

/* USER CODE BEGIN TIM1_Init 1 */

/* USER CODE END TIM1_Init 1 */
htim1.Instance = TIM1;
htim1.Init.Prescaler = 48-1;
htim1.Init.CounterMode = TIM_COUNTERMODE_UP;
htim1.Init.Period = 88;
htim1.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
htim1.Init.RepetitionCounter = 0;
htim1.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
if (HAL_TIM_Base_Init(&htim1) != HAL_OK)
{
Error_Handler();
}
sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
if (HAL_TIM_ConfigClockSource(&htim1, &sClockSourceConfig) != HAL_OK)
{
Error_Handler();
}
if (HAL_TIM_IC_Init(&htim1) != HAL_OK)
{
Error_Handler();
}
sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
sMasterConfig.MasterOutputTrigger2 = TIM_TRGO2_RESET;
sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
if (HAL_TIMEx_MasterConfigSynchronization(&htim1, &sMasterConfig) != HAL_OK)
{
Error_Handler();
}
sConfigIC.ICPolarity = TIM_INPUTCHANNELPOLARITY_FALLING;
sConfigIC.ICSelection = TIM_ICSELECTION_DIRECTTI;
sConfigIC.ICPrescaler = TIM_ICPSC_DIV1;
sConfigIC.ICFilter = 0;
if (HAL_TIM_IC_ConfigChannel(&htim1, &sConfigIC, TIM_CHANNEL_1) != HAL_OK)
{
Error_Handler();
}
sConfigIC.ICPolarity = TIM_INPUTCHANNELPOLARITY_RISING;
if (HAL_TIM_IC_ConfigChannel(&htim1, &sConfigIC, TIM_CHANNEL_2) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN TIM1_Init 2 */

/* USER CODE END TIM1_Init 2 */

}


static void MX_TIM3_Init(void)
{

/* USER CODE BEGIN TIM3_Init 0 */

/* USER CODE END TIM3_Init 0 */

TIM_ClockConfigTypeDef sClockSourceConfig = {0};
TIM_MasterConfigTypeDef sMasterConfig = {0};
TIM_OC_InitTypeDef sConfigOC = {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_PWM_Init(&htim3) != HAL_OK)
{
Error_Handler();
}
sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
if (HAL_TIMEx_MasterConfigSynchronization(&htim3, &sMasterConfig) != HAL_OK)
{
Error_Handler();
}
sConfigOC.OCMode = TIM_OCMODE_PWM1;
sConfigOC.Pulse = 0;
sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;
if (HAL_TIM_PWM_ConfigChannel(&htim3, &sConfigOC, TIM_CHANNEL_1) != HAL_OK)
{
Error_Handler();
}
if (HAL_TIM_PWM_ConfigChannel(&htim3, &sConfigOC, TIM_CHANNEL_2) != HAL_OK)
{
Error_Handler();
}
if (HAL_TIM_PWM_ConfigChannel(&htim3, &sConfigOC, TIM_CHANNEL_3) != HAL_OK)
{
Error_Handler();
}
if (HAL_TIM_PWM_ConfigChannel(&htim3, &sConfigOC, TIM_CHANNEL_4) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN TIM3_Init 2 */

/* USER CODE END TIM3_Init 2 */
HAL_TIM_MspPostInit(&htim3);

}


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 = 250000;
huart1.Init.WordLength = UART_WORDLENGTH_8B;
huart1.Init.StopBits = UART_STOPBITS_2;
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;
huart1.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
huart1.Init.ClockPrescaler = UART_PRESCALER_DIV1;
huart1.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
if (HAL_RS485Ex_Init(&huart1, UART_DE_POLARITY_HIGH, 0, 0) != HAL_OK)
{
Error_Handler();
}
if (HAL_UARTEx_SetTxFifoThreshold(&huart1, UART_TXFIFO_THRESHOLD_1_8) != HAL_OK)
{
Error_Handler();
}
if (HAL_UARTEx_SetRxFifoThreshold(&huart1, UART_RXFIFO_THRESHOLD_1_8) != HAL_OK)
{
Error_Handler();
}
if (HAL_UARTEx_DisableFifoMode(&huart1) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN USART1_Init 2 */

/* USER CODE END USART1_Init 2 */

}


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 = 115200;
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.Init.ClockPrescaler = UART_PRESCALER_DIV1;
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
*  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_GPIOB_CLK_ENABLE();
__HAL_RCC_GPIOC_CLK_ENABLE();
__HAL_RCC_GPIOA_CLK_ENABLE();

/*Configure GPIO pin Output Level */
HAL_GPIO_WritePin(LAMP_COUNT_GPIO_Port, LAMP_COUNT_Pin, GPIO_PIN_RESET);

/*Configure GPIO pin : LAMP_COUNT_Pin */
GPIO_InitStruct.Pin = LAMP_COUNT_Pin;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
HAL_GPIO_Init(LAMP_COUNT_GPIO_Port, &GPIO_InitStruct);

/* USER CODE BEGIN MX_GPIO_Init_2 */
/* USER CODE END MX_GPIO_Init_2 */
}

/* USER CODE BEGIN 4 */
// Timer2 Rising Edge Interrupt Callback
void ProcessDMXPacket(void) {
// Check for valid DMX packet and process data
if (DMXChannelCount > 0 && DMXChannelCount <= 512) {
// Example: Log or use the DMX data
for (int i = 0; i < DMXChannelCount; i++) {
// Example: Process DMX data
printf("Channel %d: %d\n", i + 1, dmxBuffer[i]);
}
}
DMXChannelCount = 0; // Reset for the next packet
}
//void ProcessDMXPacket(void) {
// // Check for valid DMX packet and process data
// if (DMXChannelCount > 0 && DMXChannelCount <= 512) {
// // Example: Log or use the DMX data
// for (int i = 0; i < DMXChannelCount; i++) {
// // Example: Process DMX data
// printf("Channel %d: %d\n", i + 1, dmxBuffer[i]);
// }
// }
// DMXChannelCount = 0; // Reset for the next packet
//}



void HAL_TIM_IC_CaptureCallback(TIM_HandleTypeDef *htim) {
if (htim->Instance == TIM1) {
if (htim->Channel == HAL_TIM_ACTIVE_CHANNEL_1) { // Falling edge
HAL_TIM_IC_Stop_IT(htim, TIM_CHANNEL_1); // Disable interrupt
MABRisingCounterRx = __HAL_TIM_GET_COUNTER(htim); // Capture counter
TimingCounterRx = MABRisingCounterRx - BreakFallingCounterRx;
TimingCounterRx += GlobalOverflowCount;

if (BreakFlag && TimingCounterRx > MAB_TIME) {
MABFlag = 1;
BreakFlag = 0;
} else {
GlobalOverflowCount = 0;
BreakFlag = 0;
InitBreakFlagRX = 0;
}
}
else if (htim->Channel == HAL_TIM_ACTIVE_CHANNEL_2) { // Rising edge
HAL_TIM_IC_Stop_IT(htim, TIM_CHANNEL_2); // Disable interrupt
if (InitBreakFlagRX) {
TimingCounterRx = NextBreakFallingCounterRx - MABRisingCounterRx;
TimingCounterRx += GlobalOverflowCount;

if (TimingCounterRx > BREAK_TIME) {
BreakFlag = 1;
InitBreakFlagRX = 0;
GlobalOverflowCount -= BreakOverflowCount;
if (TimingCounterRx > DMX_PACKET_TIME) {
PacketFlag = 1;
}
} else {
DataCorruptFlag = 1;
}
}
else {
MABRisingCounterRx = __HAL_TIM_GET_COUNTER(htim);
TimingCounterRx = MABRisingCounterRx - BreakFallingCounterRx;
if (TimingCounterRx > BREAK_TIME) {
BreakFlag = 1;
InitBreakFlagRX = 1;
BreakOverflowCount = GlobalOverflowCount;
}
}
}
}
}


void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim) {
if (htim->Instance == TIM1) {
GlobalOverflowCount++; // Handle overflow for timer counting
}
}

// Callback
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart) {
if (huart->Instance == USART1) {
// Process received data
// Restart receiving process
HAL_UART_Receive_IT(&huart1, dmxBuffer, 512);
PacketFlag = 1; // Set flag to process DMX packet
}
}
//void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart) {
// if (huart->Instance == USART1) {
// uint8_t StatusReadFlag = __HAL_UART_GET_FLAG(huart, UART_FLAG_FE | UART_FLAG_RXNE);
//
// if (StatusReadFlag & UART_FLAG_FE) { // Framing Error detected
// if (!BreakFlag && !MABFlag) {
// BreakFallingCounterRx = __HAL_TIM_GET_COUNTER(&htim1);
// HAL_TIM_IC_Start_IT(&htim2, TIM_CHANNEL_2); // Enable rising edge interrupt
// } else if (MABFlag) {
// NextBreakFallingCounterRx = __HAL_TIM_GET_COUNTER(&htim2);
// BreakOverflowCount = GlobalOverflowCount;
// HAL_TIM_IC_Start_IT(&htim2, TIM_CHANNEL_2);
// }
// } else if (StatusReadFlag & UART_FLAG_RXNE && MABFlag && !DataCorruptFlag) {
// uint8_t receivedData;
// HAL_UART_Receive(&huart1, &receivedData, 1, HAL_MAX_DELAY);
//
// if (DMXChannelCount == 0) {
// if (receivedData == 0) {
// DMXChannelCount++;
// } else {
// MABFlag = 0;
// InitBreakFlagRX = 0;
// GlobalOverflowCount = 0;
// }
// } else if (DMXChannelCount < 512) {
// DMXChannelCount++;
// // Store received data for further processing
// }
// }
// }
//}


/* 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.
*  file: pointer to the source file name
*  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 */

[SofLit]

Hello @ISHA ,

In next time please use </> button to share your code. I've edited your post.

You can refer to this link on how to post a thread in this community.

Thank you for your understanding.