Question
DMX512 control with STM32
i have done the dmx512 receiving in the stm32
but now i am trying to make it robust , when i connect disconnect the cable many times the data in my buffer changes for a second which effects in the flickering
i am using the framing error methood
i will share u the code below
void USART3_IRQHandler(void)
{
// Check for overrun error
// if (__HAL_UART_GET_FLAG(&huart3, UART_FLAG_ORE) != RESET) {
// ore = 1 ;
// memcpy(rxBuffer , bitArray , sizeof(bitArray));
//// if (skipFirstByte) {
// skipFirstByte = 0; // Set the flag to false after skipping
//// } else {
// if (rxIndex < BUFFER_SIZE) {
//
//// rxBuffer[rxIndex++] = receivedByte; // Store valid data
// // if (rxIndex ==513){
// scaledValue = (rxBuffer[1] * 257) ;
// scaledValue2 = (rxBuffer[2] * 257) ;
// scaledValue3 = (rxBuffer[3] * 257) ;
// scaledValue4 = (rxBuffer[4] * 257) ;
// scaledValue5 = (rxBuffer[5] * 257) ;
//
// __HAL_TIM_SET_COMPARE(RT1, R1, scaledValue);
// __HAL_TIM_SET_COMPARE(GT1, G1, scaledValue2);
// __HAL_TIM_SET_COMPARE(BT1, B1, scaledValue3);
// __HAL_TIM_SET_COMPARE(WWT1, WW1, scaledValue4);
// __HAL_TIM_SET_COMPARE(CWT1, CW1, scaledValue5);
//
// __HAL_TIM_SET_COMPARE(RT2, R2, scaledValue);
// __HAL_TIM_SET_COMPARE(GT2, G2, scaledValue2);
// __HAL_TIM_SET_COMPARE(BT2, B2, scaledValue3);
// __HAL_TIM_SET_COMPARE(WWT2, WW2, scaledValue4);
// __HAL_TIM_SET_COMPARE(CWT2, CW2, scaledValue5);
// }
// __HAL_UART_CLEAR_FLAG(&huart3, UART_FLAG_ORE); // Clear the overrun error flag
//// skipFirstByte = 1; // Set flag to skip first byte on next reception
// }
// Check for framing error
if ((__HAL_UART_GET_FLAG(&huart3, UART_FLAG_FE) != RESET) && (__HAL_UART_GET_FLAG(&huart3, UART_FLAG_RXNE) != RESET)&& (__HAL_UART_GET_FLAG(&huart3, UART_FLAG_ORE) == RESET)&& ((volatile uint32_t)(USART3->SR)!= 448)) {
// Handle framing error
rxIndex = 0; // Reset index
fe = 1 ;
currentFrameTime = HAL_GetTick(); // Replace with your system tick function if different
// Calculate time between frames
timeBetweenFrames = currentFrameTime - lastFrameTime;
// Update last frame time
lastFrameTime = currentFrameTime;
if ((volatile uint32_t)(USART3->SR)!= 448){
if (rxBuffer[0] == 0 ) {
memcpy(bitArray , rxBuffer , sizeof(bitArray));
memset(rxBuffer, 0, sizeof(rxBuffer));
}
}
// Clear buffer
__HAL_UART_CLEAR_FLAG(&huart3, UART_FLAG_FE); // Clear the error flag
skipFirstByte = 1; // Reset the flag to skip first byte on next reception
}
// if (__HAL_UART_GET_FLAG(&huart3, UART_FLAG_IDLE) != RESET) {
// // Handle idle line detection
// rxIndex = 0; // Reset buffer index
// memset(rxBuffer, 0, sizeof(rxBuffer)); // Clear buffer
// skipFirstByte = 1; // Indicate signal has started
// __HAL_UART_CLEAR_FLAG(&huart3, UART_FLAG_IDLE); // Clear the idle flag
// }
// Check if data is available to read
if ((__HAL_UART_GET_FLAG(&huart3, UART_FLAG_RXNE) != RESET) &&
(__HAL_UART_GET_FLAG(&huart3, UART_FLAG_TC) != RESET) &&
((volatile uint32_t)(USART3->SR) != 448)) {
// Get current timestamp (assuming you have a function to get system ticks)
idleFlagStatus = __HAL_UART_GET_FLAG(&huart3, UART_FLAG_IDLE);
receivedByte = (uint16_t)(USART3->DR & 0xFF); // Read data from USART DR
rxne = 1;
// Store data in buffer, skipping the first byte
if (skipFirstByte) {
skipFirstByte = 0; // Set the flag to false after skipping
} else {
if (rxIndex < BUFFER_SIZE) {
// Check if the condition is met
if (rxBuffer[0] != 0) {
// Reset rxBuffer to prevBuffer
memcpy(rxBuffer, prevBuffer, sizeof(rxBuffer)); // Assuming prevBuffer is defined and has the same size
} else {
// Store valid data
rxBuffer[rxIndex++] = receivedByte;
// Scale and update PWM values
scaledValue = (rxBuffer[1] * 257);
scaledValue2 = (rxBuffer[2] * 257);
scaledValue3 = (rxBuffer[3] * 257);
scaledValue4 = (rxBuffer[4] * 257);
scaledValue5 = (rxBuffer[5] * 257);
// Update PWM outputs
__HAL_TIM_SET_COMPARE(RT1, R1, scaledValue);
__HAL_TIM_SET_COMPARE(GT1, G1, scaledValue2);
__HAL_TIM_SET_COMPARE(BT1, B1, scaledValue3);
__HAL_TIM_SET_COMPARE(WWT1, WW1, scaledValue4);
__HAL_TIM_SET_COMPARE(CWT1, CW1, scaledValue5);
__HAL_TIM_SET_COMPARE(RT2, R2, scaledValue);
__HAL_TIM_SET_COMPARE(GT2, G2, scaledValue2);
__HAL_TIM_SET_COMPARE(BT2, B2, scaledValue3);
__HAL_TIM_SET_COMPARE(WWT2, WW2, scaledValue4);
__HAL_TIM_SET_COMPARE(CWT2, CW2, scaledValue5);
}
}
}
__HAL_UART_CLEAR_FLAG(&huart3, UART_FLAG_IDLE); // Clear the idle flag
}
// if ((volatile uint32_t)(USART3->SR)== 448){
// memcpy(rxBuffer , bitArray , sizeof(bitArray));
//// if (skipFirstByte) {
// skipFirstByte = 0; // Set the flag to false after skipping
//// } else {
// if (rxIndex < BUFFER_SIZE) {
//
// // rxBuffer[rxIndex++] = receivedByte; // Store valid data
// // if (rxIndex ==513){
// scaledValue = (rxBuffer[1] * 257) ;
// scaledValue2 = (rxBuffer[2] * 257) ;
// scaledValue3 = (rxBuffer[3] * 257) ;
// scaledValue4 = (rxBuffer[4] * 257) ;
// scaledValue5 = (rxBuffer[5] * 257) ;
//
// __HAL_TIM_SET_COMPARE(RT1, R1, scaledValue);
// __HAL_TIM_SET_COMPARE(GT1, G1, scaledValue2);
// __HAL_TIM_SET_COMPARE(BT1, B1, scaledValue3);
// __HAL_TIM_SET_COMPARE(WWT1, WW1, scaledValue4);
// __HAL_TIM_SET_COMPARE(CWT1, CW1, scaledValue5);
//
// __HAL_TIM_SET_COMPARE(RT2, R2, scaledValue);
// __HAL_TIM_SET_COMPARE(GT2, G2, scaledValue2);
// __HAL_TIM_SET_COMPARE(BT2, B2, scaledValue3);
// __HAL_TIM_SET_COMPARE(WWT2, WW2, scaledValue4);
// __HAL_TIM_SET_COMPARE(CWT2, CW2, scaledValue5);
// }
//
// // }
//// }
// }
}
thiis is working but how can i solve the buffer value change when i regoresly connect or discoonect pelase help