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设计思路:
采用stm32f103r6为主控芯片,及led-green;时钟源为晶振为8M的系统内部时钟;使用的定时器为TIM2,并且使用PWM Generation CH1为PWM输出;
/*** TIM2和PWM配置 ***/ TIM_HandleTypeDef htim2; /* TIM2 init function */ void MX_TIM2_Init(void) { TIM_ClockConfigTypeDef sClockSourceConfig = {0}; TIM_MasterConfigTypeDef sMasterConfig = {0}; TIM_OC_InitTypeDef sConfigOC = {0}; htim2.Instance = TIM2; htim2.Init.Prescaler = 8000-1; htim2.Init.CounterMode = TIM_COUNTERMODE_UP; htim2.Init.Period = 100-1; htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1; htim2.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE; if (HAL_TIM_Base_Init(&htim2) != HAL_OK) { Error_Handler(); } sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL; if (HAL_TIM_ConfigClockSource(&htim2, &sClockSourceConfig) != HAL_OK) { Error_Handler(); } if (HAL_TIM_PWM_Init(&htim2) != HAL_OK) { Error_Handler(); } sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET; sMasterConfig.MasterSlaveModeTIM_MASTERSLAVEMODE_DISABLE; if (HAL_TIMEx_MasterConfigSynchronization(&htim2, &sMasterConfig) != HAL_OK) { Error_Handler(); } sConfigOC.OCMode = TIM_OCMODE_PWM1; sConfigOC.Pulse = 50; sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH; sConfigOC.OCFastMode = TIM_OCFAST_DISABLE; if (HAL_TIM_PWM_ConfigChannel(&htim2, &sConfigOC, TIM_CHANNEL_1) != HAL_OK) { Error_Handler(); } HAL_TIM_MspPostInit(&htim2); } /*** 开启PWM ***/ HAL_TIM_PWM_Start(&htim2, TIM_CHANNEL_1); 1 /*** 主函数 ***/ 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 */ ystemClock_Config(); /* USER CODE BEGIN SysInit */ /* USER CODE END SysInit */ /* Initialize all configured peripherals */ MX_GPIO_Init(); MX_TIM2_Init(); /* USER CODE BEGIN 2 */ HAL_TIM_PWM_Start(&htim2, TIM_CHANNEL_1); int i = 0; /* USER CODE END 2 */ /* Infinite loop */ /* USER CODE BEGIN WHILE */ while (1) { /* USER CODE END WHILE */ /* USER CODE BEGIN 3 */ for(i=0;i<=100;i++) { __HAL_TIM_SET_COMPARE(&htim2, TIM_CHANNEL_1, i); HAL_Delay(100); i+=9; } for(i=100;i>=0;i--) { __HAL_TIM_SET_COMPARE(&htim2, TIM_CHANNEL_1, i); HAL_Delay(100); i-=9; } } /* USER CODE END 3 */ } Keil仿真PWM引脚输出波形: |
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