采用SmallRTOS为STM32F4开发板编写Led跑马灯示例

2019-07-21 03:59发布

开发环境：IAR Embedded Workbench / Keil
SmallRTOS版本：V1.00
开发板：STM32F4

功能简介：采用微型嵌入式实时操作系统SmallRTOS创建控制任务CtrlTask，led任务Led1Task、Led2Task及相关同步信号量Led1SemHandle、Led2SemHandle等，由控制任务CtrlTask通过时间休眠的方式SRTaskuSleep控制Led灯的闪烁间隔，并通过Led1SemHandle、Led2SemHandle等信号量同步led任务Led1Task、Led2Task，实现led跑马灯的实验；

相关代码如下所示：
[mw_shl_code=c,true]/***************************************************************************************************** SmallRTOS - Copyright (C) 2012～2015 SmallRTOS.ORG http://www.SmallRTOS.org - Documentation, latest information, license and contact details. http://www.SmallRTOS.com - Commercial support, development, porting, licensing and training services. http://www.SmallRTOS.net - Forum, question and ask. ******************************************************************************************************/ /* Hardware and starter kit includes. */ #include "iar_stm32f407zg_sk.h" #include "stm32f4xx.h" #include "stm32f4xx_conf.h" //SmallRTOS #include "SmallRTOS.h" SRTASK_HANDLE Led1TaskHandle = NULL; SRTASK_HANDLE Led2TaskHandle = NULL; SRTASK_HANDLE CtrlTaskHandle = NULL; SRSEMAPHORE_HANDLE Led1SemHandle = NULL; SRSEMAPHORE_HANDLE Led2SemHandle = NULL; static void Led1Task( void *pvParameters ); static void Led2Task( void *pvParameters ); static void CtrlTask( void *pvParameters ); static void prvSetupHardware( void ); int main() { prvSetupHardware(); // 创建同步信号量 Led1SemHandle = SRCreateSemaphore("Led1"); Led2SemHandle = SRCreateSemaphore("Led2"); // 创建任务 Led1TaskHandle = SRCreateTask(Led1Task, NULL, SRLOWEAST_PRIORITY+1,256,"Led1Task",eTaskStateReady); Led2TaskHandle = SRCreateTask(Led2Task, NULL, SRLOWEAST_PRIORITY+1,256,"Led2Task",eTaskStateReady); CtrlTaskHandle = SRCreateTask(CtrlTask, NULL, SRLOWEAST_PRIORITY+1, 256, "CtrlTask",eTaskStateReady); // Start the scheduler. SRTaskStartScheduler(); //if everything is ok, can't reach here for( ;; ); return 0; } void vParTestInitialise( void ) { /* Initialise all four LEDs that are built onto the starter kit. */ STM_EVAL_LEDInit( LED1 ); STM_EVAL_LEDInit( LED2 ); } static void prvSetupHardware( void ) { /* Setup STM32 system (clock, PLL and Flash configuration) */ SystemInit(); /* Ensure all priority bits are assigned as preemption priority bits. */ NVIC_PriorityGroupConfig( NVIC_PriorityGroup_4 ); /* Setup the LED outputs. */ vParTestInitialise(); /* Configure the button input. This configures the interrupt to use the lowest interrupt priority, so it is ok to use the ISR safe SmallRTOS API from the button interrupt handler. */ STM_EVAL_PBInit( BUTTON_USER, BUTTON_MODE_EXTI ); } static void CtrlTask( void *pvParameters ) { for(;;) { SRTaskuSleep(0, 500);//休眠500毫秒 SRSemaphorePost(Led1SemHandle); SRTaskuSleep(0, 500);//休眠500毫秒 SRSemaphorePost(Led2SemHandle); } } static void Led1Task( void *pvParameters ) { for(;;) { SRSemaphorePend(Led1SemHandle, SRPEND_MAX_TICKS); STM_EVAL_LEDToggle( LED1 ); } } static void Led2Task( void *pvParameters ) { for(;;) { SRSemaphorePend(Led2SemHandle, SRPEND_MAX_TICKS); STM_EVAL_LEDToggle( LED2 ); } } [/mw_shl_code]

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