Hi, guys!
I'm using a board developed in my company that uses a STM32F413VGT3. It has a MCP2551 and I have to use CAN BUS to comunicate.
The problem is that we're using PD0 and PD1 as CAN1_RX and CAN1_TX, because PA12 is used to USART1_RTS. I'm able to receive data from CAN but I can't send anything. I've used the same code in another board with STM32F103 without a problem (using the standard pin map), so I think that the problem is at alternate function of PD0 and PD1. I used STM32CubeIDE to do the remapping and it seems ok to me in function HAL_CAN_MspInit.
Is there any knowed problem with alternate function of can pins? Any ideas of what should I search for?
Code:
static void MX_CAN1_Init(void)
{
/* USER CODE BEGIN CAN1_Init 0 */
/* USER CODE END CAN1_Init 0 */
/* USER CODE BEGIN CAN1_Init 1 */
/* USER CODE END CAN1_Init 1 */
hcan1.Instance = CAN1;
hcan1.Init.Prescaler = 25;
hcan1.Init.Mode = CAN_MODE_NORMAL;
hcan1.Init.SyncJumpWidth = CAN_SJW_1TQ;
hcan1.Init.TimeSeg1 = CAN_BS1_3TQ;
hcan1.Init.TimeSeg2 = CAN_BS2_4TQ;
hcan1.Init.TimeTriggeredMode = DISABLE;
hcan1.Init.AutoBusOff = DISABLE;
hcan1.Init.AutoWakeUp = DISABLE;
hcan1.Init.AutoRetransmission = DISABLE;
hcan1.Init.ReceiveFifoLocked = DISABLE;
hcan1.Init.TransmitFifoPriority = DISABLE;
if (HAL_CAN_Init(&hcan1) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN CAN1_Init 2 */
/* USER CODE END CAN1_Init 2 */
}
/**
* @brief CAN MSP Initialization
* This function configures the hardware resources used in this example
* @param hcan: CAN handle pointer
* @retval None
*/
void HAL_CAN_MspInit(CAN_HandleTypeDef* hcan)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
if(hcan->Instance==CAN1)
{
/* USER CODE BEGIN CAN1_MspInit 0 */
/* USER CODE END CAN1_MspInit 0 */
/* Peripheral clock enable */
__HAL_RCC_CAN1_CLK_ENABLE();
__HAL_RCC_GPIOD_CLK_ENABLE();
/**CAN1 GPIO Configuration
PD0 ------> CAN1_RX
PD1 ------> CAN1_TX
*/
GPIO_InitStruct.Pin = GPIO_PIN_0;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF9_CAN1;
HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);
GPIO_InitStruct.Pin = GPIO_PIN_1;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF9_CAN1;
HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);
/* CAN1 interrupt Init */
HAL_NVIC_SetPriority(CAN1_RX0_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(CAN1_RX0_IRQn);
/* USER CODE BEGIN CAN1_MspInit 1 */
/* USER CODE END CAN1_MspInit 1 */
}
}
