wip on dma config

Src/main.c

@@ -62,27 +62,61 @@ static void MX_GPIO_Init(void);
 uint8_t rxBuffer[BUFFER_SIZE];
 uint16_t rxBufferPos = 0;
 
-void init_UART1(){
+void init_UART1_it(){
     RCC->APBENR2 |= RCC_APBENR2_USART1EN;
     RCC->IOPENR |= RCC_IOPENR_GPIOCEN;
 
     GPIOC->MODER &= ~GPIO_MODER_MODE5; // Alternate function mode on RX pin
     GPIOC->MODER |= GPIO_MODER_MODE5_1;
     GPIOC->AFR[0] &= GPIO_AFRL_AFSEL5;
-    GPIOC->AFR[0] |= 1 << GPIO_AFRL_AFSEL5_Pos;
+    GPIOC->AFR[0] |= 1 << GPIO_AFRL_AFSEL5_Pos; // AF1 -> USART1 RX
 
     USART1->BRR = 128; // 32000000÷250000
     USART1->CR1 = USART_CR1_RE;
 
-    USART1->CR3 |= USART_CR3_EIE;
-    USART1->CR1 |= USART_CR1_RXNEIE_RXFNEIE;
+    USART1->CR3 |= USART_CR3_EIE; // Interrupt on BREAK (and other errors)
+    USART1->CR1 |= USART_CR1_RXNEIE_RXFNEIE; // RX Interrupt
 
     USART1->CR1 |= USART_CR1_UE;
 
     HAL_NVIC_SetPriority(USART1_IRQn, 0, 0);
     HAL_NVIC_EnableIRQ(USART1_IRQn);
 }
-/* USER CODE END 0 */
+
+void init_UART1_dma(){
+    RCC->IOPENR |= RCC_IOPENR_GPIOCEN;
+    RCC->APBENR2 |= RCC_APBENR2_USART1EN;
+    RCC->AHBENR |= RCC_AHBENR_DMA1EN;
+
+    GPIOC->MODER &= ~GPIO_MODER_MODE5; // Alternate function mode on RX pin
+    GPIOC->MODER |= GPIO_MODER_MODE5_1;
+    GPIOC->AFR[0] &= GPIO_AFRL_AFSEL5;
+    GPIOC->AFR[0] |= 1 << GPIO_AFRL_AFSEL5_Pos; // AF1 -> USART1 RX
+
+    USART1->BRR = 128; // 32000000÷250000
+    USART1->CR1 = USART_CR1_RE;
+
+    USART1->CR3 |= USART_CR3_EIE; // Interrupt on BREAK (and other errors)
+    USART1->CR3 |= USART_CR3_DMAR; // DMA Receiver mode
+
+        DMA1_Channel1->CCR = (0x02 << DMA_CCR_PL_Pos) | DMA_CCR_MINC | DMA_CCR_TCIE;
+
+    DMA1_Channel1->CMAR  = ( uint32_t )&rxBuffer[0];
+    DMA1_Channel1->CPAR  = ( uint32_t )&(USART1->RDR);
+    DMA1_Channel1->CNDTR = 5;
+
+    DMAMUX1_Channel0->CCR &= ~( DMAMUX_CxCR_DMAREQ_ID );
+    DMAMUX1_Channel0->CCR |=  ( 50 << DMAMUX_CxCR_DMAREQ_ID_Pos ); // 50 -> USART1 RX
+
+
+    USART1->CR1 |= USART_CR1_UE;
+
+    HAL_NVIC_SetPriority(USART1_IRQn, 0, 0);
+    HAL_NVIC_EnableIRQ(USART1_IRQn);
+
+    HAL_NVIC_SetPriority(DMA1_Channel1_IRQn, 0, 0);
+    HAL_NVIC_EnableIRQ(DMA1_Channel1_IRQn);
+}
 
 void USART1_IRQHandler(){
      if(USART1->ISR & USART_ISR_RXNE_RXFNE){
@@ -95,16 +129,18 @@ void USART1_IRQHandler(){
 
      if(USART1->ISR & USART_ISR_FE){
          USART1->ICR = USART_ICR_FECF;
-         printf("FE after %d\n",rxBufferPos);
-         rxBufferPos = 0;
-         printf("buf: ");
-         for(uint16_t i=0; i<10; i++)
-             printf("0x%02X ", rxBuffer[i]);
-         printf("\n");
+         //if(rxBufferPos != 514)
+         //    printf("FE after %d\n",rxBufferPos);
+         //rxBufferPos = 0;
+         printf("FE\n");
+         //DMA1_Channel1->CNDTR = 1;
+         DMA1_Channel1->CNDTR = 5;
+         DMA1_Channel1->CCR |= ( DMA_CCR_EN );
+         //DMA1_Channel1->CCR |= ( DMA_CCR_EN );
      }
      if(USART1->ISR & USART_ISR_ORE){
          USART1->ICR = USART_ICR_ORECF;
-         printf("ORE\n");
+         //printf("ORE\n");
      }
      if(USART1->ISR & USART_ISR_NE){
          USART1->ICR = USART_ICR_NECF;
@@ -116,6 +152,15 @@ void USART1_IRQHandler(){
      }
 }
 
+void DMA1_Channel1_IRQHandler(){
+    if(DMA1->ISR & DMA_ISR_TCIF1){
+        DMA1->IFCR = DMA_IFCR_CTCIF1;
+        DMA1_Channel1->CCR &= ~( DMA_CCR_EN );
+        DMA1_Channel1->CMAR  = ( uint32_t )&rxBuffer[0];
+    }
+}
+/* USER CODE END 0 */
+
 /**
   * @brief  The application entry point.
   * @retval int
@@ -146,7 +191,7 @@ int main(void)
   /* Initialize all configured peripherals */
   MX_GPIO_Init();
   /* USER CODE BEGIN 2 */
-  init_UART1(); 
+  init_UART1_dma(); 
   /* USER CODE END 2 */
 
   /* Infinite loop */
@@ -154,6 +199,11 @@ int main(void)
   //HAL_UART_Receive_DMA(&huart1, rxBuffer, BUFFER_SIZE);
   while (1)
   {
+      printf("buf: ");
+      for(uint16_t i=0; i<10; i++)
+          printf("0x%02X ", rxBuffer[i]);
+      printf("\n");
+
     /* USER CODE END WHILE */
 
     /* USER CODE BEGIN 3 */