os_cpu.h
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/************************ (C) COPYLEFT 2010 Leafgrass *************************
* File Name : os_cpu_c.c
* Author : Librae
* Date : 06/10/2010
* Description : μCOS-II在STM32上的移植代码C语言部分，
* 包括任务堆栈初始化代码和钩子函数等
******************************************************************************/
#ifndef __OS_CPU_H__
#define __OS_CPU_H__
#ifdef OS_CPU_GLOBALS
#define OS_CPU_EXT
#else
#define OS_CPU_EXT extern
#endif
/******************************************************************************
* 定义与编译器无关的数据类型
******************************************************************************/
typedef unsigned char BOOLEAN;
typedef unsigned char INT8U; /* Unsigned 8 bit quantity */
typedef signed char INT8S; /* Signed 8 bit quantity */
typedef unsigned short INT16U; /* Unsigned 16 bit quantity */
typedef signed short INT16S; /* Signed 16 bit quantity */
typedef unsigned int INT32U; /* Unsigned 32 bit quantity */
typedef signed int INT32S; /* Signed 32 bit quantity */
typedef float FP32; /* Single precision floating point*/
typedef double FP64; /* Double precision floating point*/
//STM32是32位位宽的,这里OS_STK和OS_CPU_SR都应该为32位数据类型
typedef unsigned int OS_STK; /* Each stack entry is 32-bit wide*/
typedef unsigned int OS_CPU_SR; /* Define size of CPU status register*/
/*
*******************************************************************************
* Cortex M3
* Critical Section Management
*******************************************************************************
*/
/*
*******************************************************************************
* ARM Miscellaneous
*******************************************************************************
*/
//定义栈的增长方向.
//CM3中,栈是由高地址向低地址增长的,所以OS_STK_GROWTH设置为1
#define OS_STK_GROWTH 1 /* Stack grows from HIGH to LOW memory on ARM */
//任务切换宏,由汇编实现.
#define OS_TASK_SW() OSCtxSw()
/*
*******************************************************************************
* PROTOTYPES
* (see OS_CPU_A.ASM)
*******************************************************************************
*/
//OS_CRITICAL_METHOD = 1 :直接使用处理器的开关中断指令来实现宏
//OS_CRITICAL_METHOD = 2 :利用堆栈保存和恢复CPU的状态
//OS_CRITICAL_METHOD = 3 :利用编译器扩展功能获得程序状态字，保存在局部变量cpu_sr
#define OS_CRITICAL_METHOD 3 //进入临界段的方法
#if OS_CRITICAL_METHOD == 3
#define OS_ENTER_CRITICAL() {cpu_sr = OS_CPU_SR_Save();}
#define OS_EXIT_CRITICAL() {OS_CPU_SR_Restore(cpu_sr);}
#endif
void OSCtxSw(void);
void OSIntCtxSw(void);
void OSStartHighRdy(void);
void OSPendSV(void);
#if OS_CRITICAL_METHOD == 3u /* See OS_CPU_A.ASM */
OS_CPU_SR OS_CPU_SR_Save(void);
void OS_CPU_SR_Restore(OS_CPU_SR cpu_sr);
#endif
OS_CPU_EXT INT32U OSInterrputSum;
#endif
/************************ (C) COPYLEFT 2010 Leafgrass ************************/