實驗原理:
通過STM32的三個GPIO口來驅動LED燈的三個通道,設定GPIO為推輓輸出模式,採
用灌電流的方式與LED連線,輸出高電平LED滅,輸出低電平LED亮,通過通用定時器TIM3
實現500ms定時,每500ms變換一次LED顏色。
核心程式碼:
void MX_TIM3_Init(void) { TIM_ClockConfigTypeDef sClockSourceConfig; TIM_MasterConfigTypeDef sMasterConfig; htim3.Instance = TIM3; htim3.Init.Prescaler = 21599; htim3.Init.CounterMode = TIM_COUNTERMODE_UP; htim3.Init.Period = 4999; htim3.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1; htim3.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_ENABLE; if (HAL_TIM_Base_Init(&htim3) != HAL_OK) { _Error_Handler(__FILE__, __LINE__); } sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL; if (HAL_TIM_ConfigClockSource(&htim3, &sClockSourceConfig) != HAL_OK) { _Error_Handler(__FILE__, __LINE__); } sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET; sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE; if (HAL_TIMEx_MasterConfigSynchronization(&htim3, &sMasterConfig) != HAL_OK) { _Error_Handler(__FILE__, __LINE__); } }
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim) { static int counter = 0; if(counter % 3 == 0){ LED_RED_ON; LED_BLUE_OFF; LED_GREEN_OFF; }else if(counter % 3 == 1){ LED_RED_OFF; LED_BLUE_ON; LED_GREEN_OFF; }else if(counter % 3 == 2){ LED_RED_OFF; LED_BLUE_OFF; LED_GREEN_ON; } counter ++; }
原始碼下載連結:
連結:http://pan.baidu.com/s/1kVeflcj 密碼:z812
iCore4連結: