我正在使用STM32F469 Discovery板，我正在尝试使用CAN功能。
据我所知，在此主板上CAN1不能与触摸屏同时使用。因此我需要使用CAN2，但为了启用CAN2，需要启用CAN1。
我的配置/回调代码如下：
/* CAN1 Values */
#define CAN1_CLK_ENABLE() __HAL_RCC_CAN1_CLK_ENABLE()
#define CAN1_GPIO_CLK_ENABLE() __HAL_RCC_GPIOB_CLK_ENABLE()
#define CAN1_FORCE_RESET() __HAL_RCC_CAN1_FORCE_RESET()
#define CAN1_RELEASE_RESET() __HAL_RCC_CAN1_RELEASE_RESET()
#define CAN1_TX_PIN GPIO_PIN_9
#define CAN1_TX_GPIO_PORT GPIOB
#define CAN1_TX_AF GPIO_AF9_CAN1
#define CAN1_RX_PIN GPIO_PIN_8
#define CAN1_RX_GPIO_PORT GPIOB
#define CAN1_RX_AF GPIO_AF9_CAN1
#define CAN1_RX_IRQn CAN1_RX0_IRQn
#define CAN1_RX_IRQHandler CAN1_RX0_IRQHandler
/* CAN2 Values */
#define CAN2_CLK_ENABLE() __HAL_RCC_CAN2_CLK_ENABLE()
#define CAN2_GPIO_CLK_ENABLE() __HAL_RCC_GPIOB_CLK_ENABLE()
#define CAN2_FORCE_RESET() __HAL_RCC_CAN2_FORCE_RESET()
#define CAN2_RELEASE_RESET() __HAL_RCC_CAN2_RELEASE_RESET()
#define CAN2_TX_PIN GPIO_PIN_13
#define CAN2_TX_GPIO_PORT GPIOB
#define CAN2_TX_AF GPIO_AF9_CAN2
#define CAN2_RX_PIN GPIO_PIN_5
#define CAN2_RX_GPIO_PORT GPIOB
#define CAN2_RX_AF GPIO_AF9_CAN2
#define CAN2_RX_IRQn CAN2_RX0_IRQn
#define CAN2_RX_IRQHandler CAN2_RX0_IRQHandler
CAN_HandleTypeDef CanHandle1;
CAN_HandleTypeDef CanHandle2;
static uint8_t Message_Data[8];
static void CAN1_Config( void )
{
GPIO_InitTypeDef GPIO_InitStruct;
CAN_FilterConfTypeDef CAN_FilterInitStructure;
static CanTxMsgTypeDef TxMessage;
static CanRxMsgTypeDef RxMessage;
/* CAN1 Periph clock enable */
CAN1_CLK_ENABLE();
CAN1_GPIO_CLK_ENABLE();
/* CAN1 TX GPIO pin configuration */
GPIO_InitStruct.Pin = CAN1_TX_PIN;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Speed = GPIO_SPEED_FAST;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Alternate = CAN1_TX_AF;
HAL_GPIO_Init(CAN1_TX_GPIO_PORT, &GPIO_InitStruct);
/* CAN1 RX GPIO pin configuration */
GPIO_InitStruct.Pin = CAN1_RX_PIN;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Speed = GPIO_SPEED_FAST;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Alternate = CAN1_RX_AF;
HAL_GPIO_Init(CAN1_RX_GPIO_PORT, &GPIO_InitStruct);
/* NVIC configuration for CAN1 Reception complete interrupt */
HAL_NVIC_SetPriority(CAN1_RX_IRQn, 1, 0);
HAL_NVIC_EnableIRQ(CAN1_RX_IRQn);
CanHandle1.Instance = CAN1;
CanHandle1.pTxMsg = &TxMessage;
CanHandle1.pRxMsg = &RxMessage;
/* CAN peripheral init */
CanHandle1.Init.TTCM = DISABLE;
CanHandle1.Init.ABOM = DISABLE;
CanHandle1.Init.AWUM = DISABLE;
CanHandle1.Init.NART = DISABLE;
CanHandle1.Init.RFLM = DISABLE;
CanHandle1.Init.TXFP = DISABLE;
CanHandle1.Init.Mode = CAN_MODE_LOOPBACK;
CanHandle1.Init.SJW = CAN_SJW_1TQ;
CanHandle1.Init.BS1 = CAN_BS1_6TQ;
CanHandle1.Init.BS2 = CAN_BS2_8TQ;
CanHandle1.Init.Prescaler = 2;
HAL_CAN_Init( &CanHandle1 );
/* CAN filter init */
CAN_FilterInitStructure.FilterNumber = 0;
CAN_FilterInitStructure.FilterMode = CAN_FILTERMODE_IDMASK;
CAN_FilterInitStructure.FilterScale=CAN_FILTERSCALE_32BIT;
CAN_FilterInitStructure.FilterIdHigh = 0x0000;
CAN_FilterInitStructure.FilterIdLow = 0x0000;
CAN_FilterInitStructure.FilterMaskIdHigh = 0x0000;
CAN_FilterInitStructure.FilterMaskIdLow = 0x0000;
CAN_FilterInitStructure.FilterFIFOAssignment = 0;
CAN_FilterInitStructure.FilterActivation = ENABLE;
CAN_FilterInitStructure.BankNumber = 0;
HAL_CAN_ConfigFilter( &CanHandle1, &CAN_FilterInitStructure );
/* Configure transmission */
CanHandle1.pTxMsg->StdId = 0x7DF;
CanHandle1.pTxMsg->ExtId = 0x7DF;
CanHandle1.pTxMsg->RTR = CAN_RTR_DATA;
CanHandle1.pTxMsg->IDE = CAN_ID_STD;
CanHandle1.pTxMsg->DLC = 8;
}
static void CAN2_Config( void )
{
GPIO_InitTypeDef GPIO_InitStruct;
CAN_FilterConfTypeDef CAN_FilterInitStructure;
static CanTxMsgTypeDef TxMessage;
static CanRxMsgTypeDef RxMessage;
/* CAN2 Periph clock enable */
CAN2_CLK_ENABLE();
CAN2_GPIO_CLK_ENABLE();
/* CAN2 TX GPIO pin configuration */
GPIO_InitStruct.Pin = CAN2_TX_PIN;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Speed = GPIO_SPEED_FAST;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Alternate = CAN2_TX_AF;
HAL_GPIO_Init(CAN2_TX_GPIO_PORT, &GPIO_InitStruct);
/* CAN2 RX GPIO pin configuration */
GPIO_InitStruct.Pin = CAN2_RX_PIN;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Speed = GPIO_SPEED_FAST;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Alternate = CAN2_RX_AF;
HAL_GPIO_Init(CAN2_RX_GPIO_PORT, &GPIO_InitStruct);
/* NVIC configuration for CAN2 Reception complete interrupt */
HAL_NVIC_SetPriority(CAN2_RX_IRQn, 1, 0);
HAL_NVIC_EnableIRQ(CAN2_RX_IRQn);
CanHandle2.Instance = CAN2;
CanHandle2.pTxMsg = &TxMessage;
CanHandle2.pRxMsg = &RxMessage;
/* CAN peripheral init */
CanHandle2.Init.TTCM = DISABLE;
CanHandle2.Init.ABOM = DISABLE;
CanHandle2.Init.AWUM = DISABLE;
CanHandle2.Init.NART = DISABLE;
CanHandle2.Init.RFLM = DISABLE;
CanHandle2.Init.TXFP = DISABLE;
CanHandle2.Init.Mode = CAN_MODE_LOOPBACK;
CanHandle2.Init.SJW = CAN_SJW_1TQ;
CanHandle2.Init.BS1 = CAN_BS1_6TQ;
CanHandle2.Init.BS2 = CAN_BS2_8TQ;
CanHandle2.Init.Prescaler = 2;
HAL_CAN_Init( &CanHandle2 );
/* CAN filter init */
CAN_FilterInitStructure.FilterNumber = 0; //14 enables CAN1;
CAN_FilterInitStructure.FilterMode = CAN_FILTERMODE_IDMASK;
CAN_FilterInitStructure.FilterScale=CAN_FILTERSCALE_32BIT;
CAN_FilterInitStructure.FilterIdHigh = 0x0000;
CAN_FilterInitStructure.FilterIdLow = 0x0000;
CAN_FilterInitStructure.FilterMaskIdHigh = 0x0000;
CAN_FilterInitStructure.FilterMaskIdLow = 0x0000;
CAN_FilterInitStructure.FilterFIFOAssignment = 0;
CAN_FilterInitStructure.FilterActivation = ENABLE;
CAN_FilterInitStructure.BankNumber = 0; //14 enables CAN1
HAL_CAN_ConfigFilter( &CanHandle2, &CAN_FilterInitStructure );
/* Configure transmission */
CanHandle2.pTxMsg->StdId = 0x7DF;
CanHandle2.pTxMsg->ExtId = 0x7DF;
CanHandle2.pTxMsg->RTR = CAN_RTR_DATA;
CanHandle2.pTxMsg->IDE = CAN_ID_STD;
CanHandle2.pTxMsg->DLC = 8;
}
void HAL_CAN_RxCpltCallback(CAN_HandleTypeDef* CanHandle)
{
EwBspYellowLedOn();
Message_Data[0] = CanHandle->pRxMsg->Data[0];
Message_Data[1] = CanHandle->pRxMsg->Data[1];
Message_Data[2] = CanHandle->pRxMsg->Data[2];
Message_Data[3] = CanHandle->pRxMsg->Data[3];
Message_Data[4] = CanHandle->pRxMsg->Data[4];
Message_Data[5] = CanHandle->pRxMsg->Data[5];
Message_Data[6] = CanHandle->pRxMsg->Data[6];
Message_Data[7] = CanHandle->pRxMsg->Data[7];
if ( HAL_CAN_Receive_IT(CanHandle, CAN_FIFO0) != HAL_OK)
{
EwBspRedLedOn();
}
}
CAN_Transmit_Message( void )
{
CanHandle2.pTxMsg->StdId = 0x7DF;
CanHandle2.pTxMsg->ExtId = 0x7DF;
CanHandle2.pTxMsg->Data[0] = 0x02;
CanHandle2.pTxMsg->Data[1] = 0x01;
CanHandle2.pTxMsg->Data[2] = 0x0D;
CanHandle2.pTxMsg->Data[3] = 0x55;
CanHandle2.pTxMsg->Data[4] = 0x55;
CanHandle2.pTxMsg->Data[5] = 0x55;
CanHandle2.pTxMsg->Data[6] = 0x55;
CanHandle2.pTxMsg->Data[7] = 0x55;
if ( HAL_CAN_Transmit(&CanHandle, 10) != HAL_OK )
{
EwBspOrangeLedOn();
}
HAL_Delay(10);
}
然后我在主函数中运行以下命令来配置CAN1，CAN2和中断：
/* Configure interrupt for CAN transmission */
CAN1_Config();
CAN2_Config();
HAL_CAN_Receive_IT(&CanHandle2, CAN_FIFO0);
然后我运行CAN_Transmit_Message()。
执行此操作时，我已验证消息已成功发送（橙色LED未亮起），然后执行接收中断处理程序（黄色LED亮起）并成功接收消息（红色LED不亮）
然而，在第二次传输消息（另一次呼叫CAN_Transmit_Message()）时，传输再次成功，但接收失败（红色LED亮起）。
我按照CAN_Networking示例代码中的结构创建了此代码，但我无法弄清楚为什么它在第二条消息的HAL_CAN_Receive_IT函数失败（在成功收到第一条消息之后）。
注意：在读取stm32f4xx_HAL_CAN库文件后，我注意到有两种类型的接收/发送：
它表示1.非阻塞 - 我认为这意味着在发送/接收仍在运行时可以触发另一个中断？
在我的情况下，我想确保在发送传输请求后收到响应数据，所以我应该使用功能2吗？即我会用合适的超时调用HAL_CAN_Transmit，然后在完成调用HAL_CAN_Receive后再次使用合适的超时。
答案 0 :(得分：1)
每次收到回复都会调用HAL_CAN_Receive_IT吗？
这是一次性的。要继续接收，请在中断处理程序中再次调用它。