feat: 添加TIM4心跳闪烁并更新文档

Core/Src/main.c

@@ -21,6 +21,7 @@
 #include "dma.h"
 #include "iwdg.h"
 #include "spi.h"
+#include "tim.h"
 #include "usart.h"
 #include "gpio.h"
 
@@ -67,6 +68,7 @@
 /* Private variables ---------------------------------------------------------*/
 
 /* USER CODE BEGIN PV */
+static volatile uint16_t g_led_blink_ticks = 0;
 
 /* USER CODE END PV */
 
@@ -75,6 +77,7 @@ void SystemClock_Config(void);
 /* USER CODE BEGIN PFP */
 static void CH390_HardwareReset(void);
 static void LED_Init(void);
+static void LED_StartBlink(void);
 static void App_Init(void);
 static void App_Poll(void);
 /* USER CODE END PFP */
@@ -109,6 +112,13 @@ static void LED_Init(void)
     HAL_GPIO_WritePin(LED_PORT, LED_PIN, GPIO_PIN_SET);
 }
 
+static void LED_StartBlink(void)
+{
+    if (HAL_TIM_Base_Start_IT(&htim4) != HAL_OK) {
+        Error_Handler();
+    }
+}
+
 /**
  * @brief LED 闪烁（用于指示系统运行状态）
  */
@@ -117,6 +127,17 @@ void LED_Toggle(void)
     HAL_GPIO_TogglePin(LED_PORT, LED_PIN);
 }
 
+void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
+{
+    if (htim->Instance == TIM4) {
+        g_led_blink_ticks++;
+        if (g_led_blink_ticks >= 1000u) {
+            g_led_blink_ticks = 0u;
+            LED_Toggle();
+        }
+    }
+}
+
 static void App_Init(void)
 {
     const device_config_t *cfg;
@@ -247,10 +268,12 @@ int main(void)
   MX_USART2_UART_Init();
   MX_USART3_UART_Init();
   MX_SPI1_Init();
+  MX_TIM4_Init();
   /* USER CODE BEGIN 2 */
   
   /* LED 初始化 */
   LED_Init();
+  LED_StartBlink();
   
   /* CH390 硬件复位 */
   CH390_HardwareReset();