STM32第7章.ppt

21天学嵌入式开发 第七讲 嵌入式实时操作系统FreeRTOS 课程安排 嵌入式实时操作系统FreeRTOS简介嵌入式操作系统基本概念FreeRTOS的API模块 嵌入式实时操作系统FreeRTOS简介 FreeRTOS是一个可移植的 开源的小型实时内核 FreeRTOS支持的处理器架构有如下几种 ARM7 ARM9 Cortex M3AtmelAVR32AtmelAVRMicrochipPICMicroPIC18 PIC24 dsPICandPIC32MSP430ColdFireHCS12NEC16and32bitprocessorsXilinxVirtex4FPGA 嵌入式实时操作系统FreeRTOS简介 FreeRTOS的主要功能 优先级调度 相同优先级任务的轮转调度 同时可设成可剥夺内核或不可剥夺内核任务可选择是否共享堆栈 并且没有任务数限制消息队列 二值信号量 计数信号量 递归互斥体时间管理内存管理 嵌入式操作系统基本概念 多任务调度上下文切换实时应用和调度 FreeRTOS的API模块 定制FreeRTOSConfig h ifndefFREERTOS CONFIG H defineFREERTOS CONFIG H include something h defineconfigUSE PREEMPTION1 defineconfigUSE IDLE HOOK0 defineconfigUSE TICK HOOK0 defineconfigCPU CLOCK HZ58982400 defineconfigTICK RATE HZ250 defineconfigMAX PRIORITIES5 defineconfigMINIMAL STACK SIZE128 defineconfigTOTAL HEAP SIZE10240 defineconfigMAX TASK NAME LEN16 defineconfigUSE TRACE FACILITY0 defineconfigUSE 16 BIT TICKS0 defineconfigIDLE SHOULD YIELD1 defineconfigUSE MUTEXES0 defineconfigUSE RECURSIVE MUTEXES0 defineconfigUSE COUNTING SEMAPHORES0 defineconfigUSE ALTERNATIVE API0 defineconfigCHECK FOR STACK OVERFLOW0 defineconfigQUEUE REGISTRY SIZE10 defineINCLUDE vTaskPrioritySet1 defineINCLUDE uxTaskPriorityGet1 defineINCLUDE vTaskDelete1 defineINCLUDE vTaskCleanUpResources0 defineINCLUDE vTaskSuspend1 defineINCLUDE vResumeFromISR1 defineINCLUDE vTaskDelayUntil1 defineINCLUDE vTaskDelay1 defineINCLUDE xTaskGetSchedulerState1 defineINCLUDE xTaskGetCurrentTaskHandle1 defineINCLUDE uxTaskGetStackHighWaterMark0 defineconfigUSE CO ROUTINES0 defineconfigMAX CO ROUTINE PRIORITIES1 defineconfigKERNEL INTERRUPT PRIORITY dependentofprocessor defineconfigMAX SYSCALL INTERRUPT PRIORITY dependentonprocessorandapplication endif FREERTOS CONFIG H FreeRTOS的API模块 任务创建和删除 portBASE TYPExTaskCreate pdTASK CODEpvTaskCode constportCHAR constpcName unsignedportSHORTusStackDepth void pvParameters unsignedportBASE TYPEuxPriority xTaskHandle pvCreatedTask FreeRTOS的API模块 任务控制vTaskDelayvTaskDelayUntiluxTaskPriorityGetvTaskPrioritySetvTaskSuspendvTaskResumevTaskResumeFromISRvTaskSetApplicationTagvxTaskCallApplicationTaskHoo