stm32 HAL可以在正常模式下接收按摩，它接收但不会中断

Question

我写了一个简单的代码，如下所示，用于通过can总线接收数据。我有一块板和一个can总线分析仪用于测试。我把分析器的数据发送到板上。在调试模式中，我看到数据被正确接收；data_ received"；变量也被设置为"1"；b"；变量未更改。我们似乎没有摆脱中断功能，也没有达到while(1(

#include "main.h"
CAN_HandleTypeDef hcan1;
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_CAN1_Init(void);
CAN_RxHeaderTypeDef RxHeader;
uint8_t data[2];
volatile int data_received=0;
volatile int b=0;
void HAL_CAN_RxFifo0MsgPendingCallback(CAN_HandleTypeDef *hcan)
{
if(hcan->Instance==CAN1)
{
HAL_CAN_GetRxMessage(hcan,CAN_RX_FIFO0,&RxHeader,data);
}
if (RxHeader.DLC==2)
{
data_received=1;
}
else
{
data_received=0;
}
}

int main(void)
{
HAL_Init();
SystemClock_Config();
MX_GPIO_Init();
MX_CAN1_Init();
if (HAL_CAN_Start(&hcan1) != HAL_OK)
{
Error_Handler();
}
if (HAL_CAN_ActivateNotification(&hcan1, CAN_IT_RX_FIFO0_MSG_PENDING)!= HAL_OK)
{
Error_Handler();
}

while (1)
{
if (data_received==1)
{
b=1;
data_received=0;
}
}
}
void SystemClock_Config(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
__HAL_RCC_PWR_CLK_ENABLE();
__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
RCC_OscInitStruct.HSEState = RCC_HSE_ON;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
RCC_OscInitStruct.PLL.PLLM = 25;
RCC_OscInitStruct.PLL.PLLN = 336;
RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
RCC_OscInitStruct.PLL.PLLQ = 4;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
Error_Handler();
}

RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
|RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5) != HAL_OK)
{
Error_Handler();
}
}
static void MX_CAN1_Init(void)
{
hcan1.Instance = CAN1;
hcan1.Init.Prescaler = 3;
hcan1.Init.Mode = CAN_MODE_NORMAL;
hcan1.Init.SyncJumpWidth = CAN_SJW_1TQ;
hcan1.Init.TimeSeg1 = CAN_BS1_11TQ;
hcan1.Init.TimeSeg2 = CAN_BS2_2TQ;
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();
}
CAN_FilterTypeDef canfilterconfig;
canfilterconfig.FilterActivation = CAN_FILTER_ENABLE;
canfilterconfig.FilterBank = 18;
canfilterconfig.FilterFIFOAssignment = CAN_RX_FIFO0;
canfilterconfig.FilterIdHigh = 0x103<<5;
canfilterconfig.FilterIdLow = 0x0000;
canfilterconfig.FilterMaskIdHigh = 0x103<<5;
canfilterconfig.FilterMaskIdLow = 0x0000;
canfilterconfig.FilterMode = CAN_FILTERMODE_IDMASK;
canfilterconfig.FilterScale = CAN_FILTERSCALE_32BIT;
canfilterconfig.SlaveStartFilterBank = 20;
HAL_CAN_ConfigFilter(&hcan1, &canfilterconfig);
}
static void MX_GPIO_Init(void)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
/* GPIO Ports Clock Enable */
__HAL_RCC_GPIOH_CLK_ENABLE();
__HAL_RCC_GPIOE_CLK_ENABLE();
__HAL_RCC_GPIOA_CLK_ENABLE();
HAL_GPIO_WritePin(GPIOE, GPIO_PIN_11, GPIO_PIN_SET);
GPIO_InitStruct.Pin = GPIO_PIN_11;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
HAL_GPIO_Init(GPIOE, &GPIO_InitStruct);
}
void Error_Handler(void)
{
__disable_irq();
while (1)
{
}
}
#ifdef  USE_FULL_ASSERT
void assert_failed(uint8_t *file, uint32_t line)
{

}
#endif 

Answer 1

查看HAL_CAN_GetRxMessage函数内部，所有八个数据数组字节始终初始化：

aData[0] = (uint8_t)((CAN_RDL0R_DATA0 & hcan->Instance->sFIFOMailBox[RxFifo].RDLR) >> CAN_RDL0R_DATA0_Pos);
aData[1] = (uint8_t)((CAN_RDL0R_DATA1 & hcan->Instance->sFIFOMailBox[RxFifo].RDLR) >> CAN_RDL0R_DATA1_Pos);
aData[2] = (uint8_t)((CAN_RDL0R_DATA2 & hcan->Instance->sFIFOMailBox[RxFifo].RDLR) >> CAN_RDL0R_DATA2_Pos);
aData[3] = (uint8_t)((CAN_RDL0R_DATA3 & hcan->Instance->sFIFOMailBox[RxFifo].RDLR) >> CAN_RDL0R_DATA3_Pos);
aData[4] = (uint8_t)((CAN_RDH0R_DATA4 & hcan->Instance->sFIFOMailBox[RxFifo].RDHR) >> CAN_RDH0R_DATA4_Pos);
aData[5] = (uint8_t)((CAN_RDH0R_DATA5 & hcan->Instance->sFIFOMailBox[RxFifo].RDHR) >> CAN_RDH0R_DATA5_Pos);
aData[6] = (uint8_t)((CAN_RDH0R_DATA6 & hcan->Instance->sFIFOMailBox[RxFifo].RDHR) >> CAN_RDH0R_DATA6_Pos);
aData[7] = (uint8_t)((CAN_RDH0R_DATA7 & hcan->Instance->sFIFOMailBox[RxFifo].RDHR) >> CAN_RDH0R_DATA7_Pos);

然而，您的data数组只有两个字节长。HAL_CAN_GetRxMessage覆盖其他变量。这可能不是你的问题，但这是一个明显的错误，最终会咬到你。

请注意，编译后，变量的顺序可能与源中的不同。你可能会认为data_received被高估了，但事实并非如此。要找出变量的实际顺序，可以查看映射文件。