接前一天将所有工程拷贝到建立的另外一个文件夹LED中在Inc文件夹中建立led.h文件在Src文件夹中建立led.c。用keil打开工程点击下图中的图标新建一个USER分类将刚刚创建的led.c添加进入。打开led.c将gpio.c中初始化部分复制粘贴到led.c并稍作修改修改完后led.c中的代码如下#include led.h void LED_Init(void) { GPIO_InitTypeDef GPIO_InitStruct {0}; /* GPIO Ports Clock Enable */ __HAL_RCC_GPIOC_CLK_ENABLE(); __HAL_RCC_GPIOF_CLK_ENABLE(); __HAL_RCC_GPIOD_CLK_ENABLE(); /*Configure GPIO pin Output Level */ HAL_GPIO_WritePin(GPIOC, GPIO_PIN_13|GPIO_PIN_14|GPIO_PIN_15|GPIO_PIN_8 |GPIO_PIN_9|GPIO_PIN_10|GPIO_PIN_11|GPIO_PIN_12, GPIO_PIN_SET); /*Configure GPIO pin Output Level */ HAL_GPIO_WritePin(GPIOD, GPIO_PIN_2, GPIO_PIN_RESET); /*Configure GPIO pins : PC13 PC14 PC15 PC8 PC9 PC10 PC11 PC12 */ GPIO_InitStruct.Pin GPIO_PIN_13|GPIO_PIN_14|GPIO_PIN_15|GPIO_PIN_8 |GPIO_PIN_9|GPIO_PIN_10|GPIO_PIN_11|GPIO_PIN_12; GPIO_InitStruct.Mode GPIO_MODE_OUTPUT_PP; GPIO_InitStruct.Pull GPIO_NOPULL; GPIO_InitStruct.Speed GPIO_SPEED_FREQ_LOW; HAL_GPIO_Init(GPIOC, GPIO_InitStruct); /*Configure GPIO pin : PD2 */ GPIO_InitStruct.Pin GPIO_PIN_2; GPIO_InitStruct.Mode GPIO_MODE_OUTPUT_PP; GPIO_InitStruct.Pull GPIO_NOPULL; GPIO_InitStruct.Speed GPIO_SPEED_FREQ_LOW; HAL_GPIO_Init(GPIOD, GPIO_InitStruct); }led.h中代码如下需要在最后多加几个空格行不然编译会有警告。#include main.h void LED_Init(void);然后将Inc文件夹中gpio.h文件和Src文件夹中gpio.c两个文件删除main.c中原来的MX_GPIO_Init();修改为LED_Init();头文件包含修改为#include main.h#include led.h代码如下已做部分删减删除了一些不需要的注释#include main.h #include led.h void SystemClock_Config(void); int main(void) { /* USER CODE BEGIN 1 */ /* USER CODE END 1 */ /* MCU Configuration--------------------------------------------------------*/ /* Reset of all peripherals, Initializes the Flash interface and the Systick. */ HAL_Init(); /* USER CODE BEGIN Init */ /* USER CODE END Init */ /* Configure the system clock */ SystemClock_Config(); /* USER CODE BEGIN SysInit */ /* USER CODE END SysInit */ /* Initialize all configured peripherals */ LED_Init(); /* USER CODE BEGIN 2 */ /* USER CODE END 2 */ /* Infinite loop */ /* USER CODE BEGIN WHILE */ while (1) { /* USER CODE END WHILE */ /* USER CODE BEGIN 3 */ HAL_GPIO_WritePin(GPIOC, GPIO_PIN_13|GPIO_PIN_14|GPIO_PIN_15|GPIO_PIN_8 |GPIO_PIN_9|GPIO_PIN_10|GPIO_PIN_11|GPIO_PIN_12, GPIO_PIN_RESET); HAL_GPIO_WritePin(GPIOD, GPIO_PIN_2, GPIO_PIN_SET); HAL_GPIO_WritePin(GPIOD, GPIO_PIN_2, GPIO_PIN_RESET); HAL_Delay(500); HAL_GPIO_WritePin(GPIOC, GPIO_PIN_13|GPIO_PIN_14|GPIO_PIN_15|GPIO_PIN_8 |GPIO_PIN_9|GPIO_PIN_10|GPIO_PIN_11|GPIO_PIN_12, GPIO_PIN_SET); HAL_GPIO_WritePin(GPIOD, GPIO_PIN_2, GPIO_PIN_SET); HAL_GPIO_WritePin(GPIOD, GPIO_PIN_2, GPIO_PIN_RESET); HAL_Delay(500); } /* USER CODE END 3 */ } /** * brief System Clock Configuration * retval None */ void SystemClock_Config(void) { RCC_OscInitTypeDef RCC_OscInitStruct {0}; RCC_ClkInitTypeDef RCC_ClkInitStruct {0}; /** Configure the main internal regulator output voltage */ HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE1); /** Initializes the RCC Oscillators according to the specified parameters * in the RCC_OscInitTypeDef structure. */ 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 RCC_PLLM_DIV3; RCC_OscInitStruct.PLL.PLLN 20; RCC_OscInitStruct.PLL.PLLP RCC_PLLP_DIV2; RCC_OscInitStruct.PLL.PLLQ RCC_PLLQ_DIV2; RCC_OscInitStruct.PLL.PLLR RCC_PLLR_DIV2; if (HAL_RCC_OscConfig(RCC_OscInitStruct) ! HAL_OK) { Error_Handler(); } /** Initializes the CPU, AHB and APB buses clocks */ 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_DIV1; RCC_ClkInitStruct.APB2CLKDivider RCC_HCLK_DIV1; if (HAL_RCC_ClockConfig(RCC_ClkInitStruct, FLASH_LATENCY_2) ! HAL_OK) { Error_Handler(); } } /* USER CODE BEGIN 4 */ /* USER CODE END 4 */ /** * brief This function is executed in case of error occurrence. * retval None */ void Error_Handler(void) { /* USER CODE BEGIN Error_Handler_Debug */ /* User can add his own implementation to report the HAL error return state */ __disable_irq(); while (1) { } /* USER CODE END Error_Handler_Debug */ } #ifdef USE_FULL_ASSERT /** * brief Reports the name of the source file and the source line number * where the assert_param error has occurred. * param file: pointer to the source file name * param line: assert_param error line source number * retval None */ void assert_failed(uint8_t *file, uint32_t line) { /* USER CODE BEGIN 6 */ /* User can add his own implementation to report the file name and line number, ex: printf(Wrong parameters value: file %s on line %d\r\n, file, line) */ /* USER CODE END 6 */ } #endif /* USE_FULL_ASSERT */ /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/编译后无错误无警告下面开始在led.c中编写led的控制函数方便快速点亮需要的灯。函数内容如下第一行将需要点亮的led对应的IO口置为低电平第二行将不需要点亮的led对应的IO口置为高电平然后三四两行进行锁存。void led_display(unsigned char led) { HAL_GPIO_WritePin(GPIOC, led8, GPIO_PIN_RESET); HAL_GPIO_WritePin(GPIOC, (~led)8, GPIO_PIN_SET); HAL_GPIO_WritePin(GPIOD, GPIO_PIN_2, GPIO_PIN_SET); HAL_GPIO_WritePin(GPIOD, GPIO_PIN_2, GPIO_PIN_RESET); }在led.h中添加void led_display(unsigned char led);#include main.h void LED_Init(void); void led_display(unsigned char led);最后在main.c的while(1)中使用刚刚编写好的函数实现点灯的效果。int main(void) { /* USER CODE BEGIN 1 */ /* USER CODE END 1 */ /* MCU Configuration--------------------------------------------------------*/ /* Reset of all peripherals, Initializes the Flash interface and the Systick. */ HAL_Init(); /* USER CODE BEGIN Init */ /* USER CODE END Init */ /* Configure the system clock */ SystemClock_Config(); /* USER CODE BEGIN SysInit */ /* USER CODE END SysInit */ /* Initialize all configured peripherals */ LED_Init(); /* USER CODE BEGIN 2 */ /* USER CODE END 2 */ /* Infinite loop */ /* USER CODE BEGIN WHILE */ while (1) { /* USER CODE END WHILE */ /* USER CODE BEGIN 3 */ led_display(0x88); HAL_Delay(500); led_display(0x44); HAL_Delay(500); led_display(0x00); HAL_Delay(500); } /* USER CODE END 3 */ }