1.0

Core/Src/can.c

@@ -39,7 +39,7 @@ void MX_CAN1_Init(void)
   /* USER CODE END CAN1_Init 1 */
   hcan1.Instance = CAN1;
   hcan1.Init.Prescaler = 21;
-  hcan1.Init.Mode = CAN_MODE_NORMAL;
+  hcan1.Init.Mode = CAN_MODE_LOOPBACK;
   hcan1.Init.SyncJumpWidth = CAN_SJW_1TQ;
   hcan1.Init.TimeSeg1 = CAN_BS1_6TQ;
   hcan1.Init.TimeSeg2 = CAN_BS2_1TQ;

Core/Src/main.c

@@ -69,7 +69,10 @@ void SystemClock_Config(void);
 extern USBD_HandleTypeDef hUsbDeviceFS; // 引入 USB 状态句柄
 
 int _write(int file, char *ptr, int len) {
-  HAL_UART_Transmit(&huart4, (uint8_t*)ptr, len, HAL_MAX_DELAY);
+  for (int i = 0; i < len; i++) {
+    HAL_UART_Transmit(&huart4, (uint8_t*)&ptr[i], 1, 1000);
+    HAL_Delay(1);  // 每个字符间隔 1ms
+  }
   return len;
 }
 /* USER CODE END 0 */
@@ -115,9 +118,9 @@ int main(void)
   MX_CAN1_Init();
   MX_UART4_Init();
   /* USER CODE BEGIN 2 */
-  // 1. 初始化 bxCAN 过滤器 (全通)
+// 1. 结构体一定要初始化为 0！
-  // 后面的 printf 就能看到了
+  CAN_FilterTypeDef canFilterConfig = {0};
-  CAN_FilterTypeDef canFilterConfig;
+
   canFilterConfig.FilterBank = 0;
   canFilterConfig.FilterMode = CAN_FILTERMODE_IDMASK;
   canFilterConfig.FilterScale = CAN_FILTERSCALE_32BIT;
@@ -127,16 +130,16 @@ int main(void)
   canFilterConfig.FilterMaskIdLow = 0x0000;
   canFilterConfig.FilterFIFOAssignment = CAN_RX_FIFO0;
   canFilterConfig.FilterActivation = ENABLE;
+
+  // 2. 加上这极其关键的一句，把 0-13 号过滤器分给 CAN1
   canFilterConfig.SlaveStartFilterBank = 14;
 
   HAL_StatusTypeDef fs = HAL_CAN_ConfigFilter(&hcan1, &canFilterConfig);
   HAL_StatusTypeDef ss = HAL_CAN_Start(&hcan1);
-
-  // 这句开启接收中断的函数极其重要，确认它还在！
   HAL_StatusTypeDef ns = HAL_CAN_ActivateNotification(&hcan1, CAN_IT_RX_FIFO0_MSG_PENDING);
 
-  // 💡 修改这里：必须加这一句！给你的电脑 3 秒钟时间去识别 USB 虚拟串口
+  HAL_Delay(1000);
-  HAL_Delay(3000);
+  printf("Filter: %d, Start: %d, Notify: %d\r\n", fs, ss, ns);
   /* USER CODE END 2 */
 
   /* Infinite loop */
@@ -154,6 +157,11 @@ int main(void)
     // ==========================================
     // 强制打印 2：原来的 CAN 接收处理逻辑
     // ==========================================
+    uint32_t fifo_pending = HAL_CAN_GetRxFifoFillLevel(&hcan1, CAN_RX_FIFO0);
+    if (fifo_pending > 0) {
+      printf("FIFO has %lu messages\r\n", fifo_pending);
+    }
+
     if (can_rx_flag == 1) {
       can_rx_flag = 0; // 赶紧先把标志位清零
 

FDR-Core.ioc

@@ -6,7 +6,8 @@ CAN1.BS1=CAN_BS1_6TQ
 CAN1.CalculateBaudRate=250000
 CAN1.CalculateTimeBit=4000
 CAN1.CalculateTimeQuantum=500.0
-CAN1.IPParameters=CalculateTimeQuantum,CalculateTimeBit,CalculateBaudRate,Prescaler,BS1
+CAN1.IPParameters=CalculateTimeQuantum,CalculateTimeBit,CalculateBaudRate,Prescaler,BS1,Mode
+CAN1.Mode=CAN_MODE_LOOPBACK
 CAN1.Prescaler=21
 File.Version=6
 GPIO.groupedBy=
@@ -192,7 +193,7 @@ ProjectManager.ToolChainLocation=
 ProjectManager.UAScriptAfterPath=
 ProjectManager.UAScriptBeforePath=
 ProjectManager.UnderRoot=false
-ProjectManager.functionlistsort=1-SystemClock_Config-RCC-false-HAL-false,2-MX_GPIO_Init-GPIO-false-HAL-true,3-MX_TIM1_Init-TIM1-false-HAL-true,4-MX_TIM2_Init-TIM2-false-HAL-true,5-MX_TIM3_Init-TIM3-false-HAL-true,6-MX_TIM4_Init-TIM4-false-HAL-true,7-MX_TIM5_Init-TIM5-false-HAL-true,8-MX_TIM8_Init-TIM8-false-HAL-true,9-MX_USB_DEVICE_Init-USB_DEVICE-false-HAL-false,10-MX_TIM9_Init-TIM9-false-HAL-true,11-MX_TIM6_Init-TIM6-false-HAL-true,12-MX_CAN1_Init-CAN1-false-HAL-true,13-MX_USART1_UART_Init-USART1-false-HAL-true
+ProjectManager.functionlistsort=1-SystemClock_Config-RCC-false-HAL-false,2-MX_GPIO_Init-GPIO-false-HAL-true,3-MX_TIM1_Init-TIM1-false-HAL-true,4-MX_TIM2_Init-TIM2-false-HAL-true,5-MX_TIM3_Init-TIM3-false-HAL-true,6-MX_TIM4_Init-TIM4-false-HAL-true,7-MX_TIM5_Init-TIM5-false-HAL-true,8-MX_TIM8_Init-TIM8-false-HAL-true,9-MX_USB_DEVICE_Init-USB_DEVICE-false-HAL-false,10-MX_TIM9_Init-TIM9-false-HAL-true,11-MX_TIM6_Init-TIM6-false-HAL-true,12-MX_CAN1_Init-CAN1-false-HAL-true,13-MX_UART4_Init-UART4-false-HAL-true
 RCC.48MHZClocksFreq_Value=48000000
 RCC.AHBFreq_Value=168000000
 RCC.APB1CLKDivider=RCC_HCLK_DIV4