STM32第7章.ppt

21天學(xué)嵌入式開發(fā) 第七講 嵌入式實(shí)時(shí)操作系統(tǒng)FreeRTOS 課程安排 嵌入式實(shí)時(shí)操作系統(tǒng)FreeRTOS簡(jiǎn)介嵌入式操作系統(tǒng)基本概念FreeRTOS的API模塊 嵌入式實(shí)時(shí)操作系統(tǒng)FreeRTOS簡(jiǎn)介 FreeRTOS是一個(gè)可移植的 開源的小型實(shí)時(shí)內(nèi)核 FreeRTOS支持的處理器架構(gòu)有如下幾種 ARM7 ARM9 Cortex M3AtmelAVR32AtmelAVRMicrochipPICMicroPIC18 PIC24 dsPICandPIC32MSP430ColdFireHCS12NEC16and32bitprocessorsXilinxVirtex4FPGA 嵌入式實(shí)時(shí)操作系統(tǒng)FreeRTOS簡(jiǎn)介 FreeRTOS的主要功能 優(yōu)先級(jí)調(diào)度 相同優(yōu)先級(jí)任務(wù)的輪轉(zhuǎn)調(diào)度 同時(shí)可設(shè)成可剝奪內(nèi)核或不可剝奪內(nèi)核任務(wù)可選擇是否共享堆棧 并且沒有任務(wù)數(shù)限制消息隊(duì)列 二值信號(hào)量 計(jì)數(shù)信號(hào)量 遞歸互斥體時(shí)間管理內(nèi)存管理 嵌入式操作系統(tǒng)基本概念 多任務(wù)調(diào)度上下文切換實(shí)時(shí)應(yīng)用和調(diào)度 FreeRTOS的API模塊 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模塊 任務(wù)創(chuàng)建和刪除 portBASE TYPExTaskCreate pdTASK CODEpvTaskCode constportCHAR constpcName unsignedportSHORTusStackDepth void pvParameters unsignedportBASE TYPEuxPriority xTaskHandle pvCreatedTask FreeRTOS的API模塊 任務(wù)控制vTaskDelayvTaskDelayUntiluxTaskPriorityGetvTaskPrioritySetvTaskSuspendvTaskResumevTaskResumeFromISRvTaskSetApplicationTagvxTaskCallApplicationTaskHoo