1、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-M3 Atmel AVR32 Atmel AVR Microchip PICMicro PIC18 , PIC24 , dsPIC and PIC32 MSP430 ColdFire HCS12 NEC 16 and 32 bit processors
2、Xilinx Virtex4 FPGA,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,#ifndef FREERTOS_CONFIG_H #define FREERTOS_CONFIG_H #include “something.h“ #define c
3、onfigUSE_PREEMPTION 1 #define configUSE_IDLE_HOOK 0 #define configUSE_TICK_HOOK 0 #define configCPU_CLOCK_HZ 58982400 #define configTICK_RATE_HZ 250 #define configMAX_PRIORITIES 5 #define configMINIMAL_STACK_SIZE 128 #define configTOTAL_HEAP_SIZE 10240 #define configMAX_TASK_NAME_LEN 16 #define conf
4、igUSE_TRACE_FACILITY 0 #define configUSE_16_BIT_TICKS 0 #define configIDLE_SHOULD_YIELD 1 #define configUSE_MUTEXES 0 #define configUSE_RECURSIVE_MUTEXES 0 #define configUSE_COUNTING_SEMAPHORES 0 #define configUSE_ALTERNATIVE_API 0 #define configCHECK_FOR_STACK_OVERFLOW 0,#define configQUEUE_REGISTR
5、Y_SIZE 10 #define INCLUDE_vTaskPrioritySet 1 #define INCLUDE_uxTaskPriorityGet 1 #define INCLUDE_vTaskDelete 1 #define INCLUDE_vTaskCleanUpResources 0 #define INCLUDE_vTaskSuspend 1 #define INCLUDE_vResumeFromISR 1 #define INCLUDE_vTaskDelayUntil 1 #define INCLUDE_vTaskDelay 1 #define INCLUDE_xTaskG
6、etSchedulerState 1 #define INCLUDE_xTaskGetCurrentTaskHandle 1 #define INCLUDE_uxTaskGetStackHighWaterMark 0 #define configUSE_CO_ROUTINES 0 #define configMAX_CO_ROUTINE_PRIORITIES 1 #define configKERNEL_INTERRUPT_PRIORITY dependent of processor #define configMAX_SYSCALL_INTERRUPT_PRIORITY dependent
7、 on processor and application #endif /* FREERTOS_CONFIG_H */,FreeRTOS的API模块,任务创建和删除,portBASE_TYPE xTaskCreate( pdTASK_CODE pvTaskCode, const portCHAR * const pcName, unsigned portSHORT usStackDepth, void *pvParameters, unsigned portBASE_TYPE uxPriority, xTaskHandle *pvCreatedTask );,FreeRTOS的API模块,任务控制 vTaskDelay vTaskDelayUntil uxTaskPriorityGet vTaskPrioritySet vTaskSuspend vTaskResume vTaskResumeFromISR vTaskSetApplicationTag vxTaskCallApplicationTaskHook,FreeRTOS的API模块,内核控制 vTaskStartScheduler TaskEndScheduler vTaskSuspendAll,FreeRTOS移植,参阅后面的章节,性格决定命运, 专注成就人生, 源智天下,
