uc/os-II 原理及应用(八) 系统裁减以及移植到51单片机上

两个习题

  1. 先了解下CPU上函数调用的过程:

    • 一个程序取得函数地址,先保护现场将局部变量及参数压栈,再将调用函数的参数压栈,然后跳转到函数位置,将参数出栈,执行代码,结束后返回到调用位置,再怖复现场。
    • 在多任务系统中,如果多个任务并发的调用一个函数,可能会产生干扰,简单的说是线程不安全。
      如果一个函数被多个任务并发的调用而不产生干扰(线程安全),就是可重入函数。
  2. 各个任务用来存储各自任务堆栈内容的空间是任务堆栈;各个任务在运行时使用的堆栈是系统堆栈。

    在任务切换时,系统堆栈的内容要到重新保存到被中止任务的堆栈空间,要运行的任务的堆栈内存复制到系统堆栈上来。

    任务没有在运行时任务堆栈空间的内容只是备份,所以是那些内容是任务堆栈映像。

移植记录

先使用Keil4 建立一个工程 ucosii_c51,建立两组User与uCOS-II,在User中加入main.c,在uCOS-II中加入uCOS-II的源码


的uCOS-II的目录下新建 os_cfg.h,os_cpu.h,app_cfg.h 三个头文件,把os_cfg_r.h的内容先复制到os_cfg.h中来

然后修改os_cfg.h来对uCOS-II系统进行裁减,先做到最小配置

c 复制代码
#ifndef __OS_CFG_H__
#define __OS_CFG_H__


                                       /* ---------------------- MISCELLANEOUS ----------------------- */
#define OS_APP_HOOKS_EN           0u   /* Application-defined hooks are called from the uC/OS-II hooks */
#define OS_ARG_CHK_EN             0u   /* Enable (1) or Disable (0) argument checking                  */
#define OS_CPU_HOOKS_EN           0u   /* uC/OS-II hooks are found in the processor port files         */

#define OS_DEBUG_EN               0u   /* Enable(1) debug variables                                    */

#define OS_EVENT_MULTI_EN         1u   /* Include code for OSEventPendMulti()                          */
#define OS_EVENT_NAME_EN          0u   /* Enable names for Sem, Mutex, Mbox and Q                      */

#define OS_LOWEST_PRIO           20u   /* Defines the lowest priority that can be assigned ...         */
                                       /* ... MUST NEVER be higher than 254!                           */

#define OS_MAX_EVENTS            10u   /* Max. number of event control blocks in your application      */
#define OS_MAX_FLAGS              5u   /* Max. number of Event Flag Groups    in your application      */
#define OS_MAX_MEM_PART           5u   /* Max. number of memory partitions                             */
#define OS_MAX_QS                 4u   /* Max. number of queue control blocks in your application      */
#define OS_MAX_TASKS             20u   /* Max. number of tasks in your application, MUST be >= 2       */

#define OS_SCHED_LOCK_EN          1u   /* Include code for OSSchedLock() and OSSchedUnlock()           */

#define OS_TICK_STEP_EN           1u   /* Enable tick stepping feature for uC/OS-View                  */
#define OS_TICKS_PER_SEC        100u   /* Set the number of ticks in one second                        */


                                       /* --------------------- TASK STACK SIZE ---------------------- */
#define OS_TASK_TMR_STK_SIZE    128u   /* Timer      task stack size (# of OS_STK wide entries)        */
#define OS_TASK_STAT_STK_SIZE   128u   /* Statistics task stack size (# of OS_STK wide entries)        */
#define OS_TASK_IDLE_STK_SIZE   128u   /* Idle       task stack size (# of OS_STK wide entries)        */


                                       /* --------------------- TASK MANAGEMENT ---------------------- */
#define OS_TASK_CHANGE_PRIO_EN    0u   /*     Include code for OSTaskChangePrio()                      */
#define OS_TASK_CREATE_EN         1u   /*     Include code for OSTaskCreate()                          */
#define OS_TASK_CREATE_EXT_EN     0u   /*     Include code for OSTaskCreateExt()                       */
#define OS_TASK_DEL_EN            1u   /*     Include code for OSTaskDel()                             */
#define OS_TASK_NAME_EN           0u   /*     Enable task names                                        */
#define OS_TASK_PROFILE_EN        1u   /*     Include variables in OS_TCB for profiling                */
#define OS_TASK_QUERY_EN          1u   /*     Include code for OSTaskQuery()                           */
#define OS_TASK_REG_TBL_SIZE      1u   /*     Size of task variables array (#of INT32U entries)        */
#define OS_TASK_STAT_EN           0u   /*     Enable (1) or Disable(0) the statistics task             */
#define OS_TASK_STAT_STK_CHK_EN   1u   /*     Check task stacks from statistic task                    */
#define OS_TASK_SUSPEND_EN        1u   /*     Include code for OSTaskSuspend() and OSTaskResume()      */
#define OS_TASK_SW_HOOK_EN        0u   /*     Include code for OSTaskSwHook()                          */


                                       /* ----------------------- EVENT FLAGS ------------------------ */
#define OS_FLAG_EN                0u   /* Enable (1) or Disable (0) code generation for EVENT FLAGS    */
#define OS_FLAG_ACCEPT_EN         1u   /*     Include code for OSFlagAccept()                          */
#define OS_FLAG_DEL_EN            1u   /*     Include code for OSFlagDel()                             */
#define OS_FLAG_NAME_EN           1u   /*     Enable names for event flag group                        */
#define OS_FLAG_QUERY_EN          1u   /*     Include code for OSFlagQuery()                           */
#define OS_FLAG_WAIT_CLR_EN       1u   /* Include code for Wait on Clear EVENT FLAGS                   */
#define OS_FLAGS_NBITS           16u   /* Size in #bits of OS_FLAGS data type (8, 16 or 32)            */


                                       /* -------------------- MESSAGE MAILBOXES --------------------- */
#define OS_MBOX_EN                0u   /* Enable (1) or Disable (0) code generation for MAILBOXES      */
#define OS_MBOX_ACCEPT_EN         1u   /*     Include code for OSMboxAccept()                          */
#define OS_MBOX_DEL_EN            1u   /*     Include code for OSMboxDel()                             */
#define OS_MBOX_PEND_ABORT_EN     1u   /*     Include code for OSMboxPendAbort()                       */
#define OS_MBOX_POST_EN           1u   /*     Include code for OSMboxPost()                            */
#define OS_MBOX_POST_OPT_EN       1u   /*     Include code for OSMboxPostOpt()                         */
#define OS_MBOX_QUERY_EN          1u   /*     Include code for OSMboxQuery()                           */


                                       /* --------------------- MEMORY MANAGEMENT -------------------- */
#define OS_MEM_EN                 0u   /* Enable (1) or Disable (0) code generation for MEMORY MANAGER */
#define OS_MEM_NAME_EN            1u   /*     Enable memory partition names                            */
#define OS_MEM_QUERY_EN           1u   /*     Include code for OSMemQuery()                            */


                                       /* ---------------- MUTUAL EXCLUSION SEMAPHORES --------------- */
#define OS_MUTEX_EN               0u   /* Enable (1) or Disable (0) code generation for MUTEX          */
#define OS_MUTEX_ACCEPT_EN        1u   /*     Include code for OSMutexAccept()                         */
#define OS_MUTEX_DEL_EN           1u   /*     Include code for OSMutexDel()                            */
#define OS_MUTEX_QUERY_EN         1u   /*     Include code for OSMutexQuery()                          */


                                       /* ---------------------- MESSAGE QUEUES ---------------------- */
#define OS_Q_EN                   0u   /* Enable (1) or Disable (0) code generation for QUEUES         */
#define OS_Q_ACCEPT_EN            1u   /*     Include code for OSQAccept()                             */
#define OS_Q_DEL_EN               1u   /*     Include code for OSQDel()                                */
#define OS_Q_FLUSH_EN             1u   /*     Include code for OSQFlush()                              */
#define OS_Q_PEND_ABORT_EN        1u   /*     Include code for OSQPendAbort()                          */
#define OS_Q_POST_EN              1u   /*     Include code for OSQPost()                               */
#define OS_Q_POST_FRONT_EN        1u   /*     Include code for OSQPostFront()                          */
#define OS_Q_POST_OPT_EN          1u   /*     Include code for OSQPostOpt()                            */
#define OS_Q_QUERY_EN             1u   /*     Include code for OSQQuery()                              */


                                       /* ------------------------ SEMAPHORES ------------------------ */
#define OS_SEM_EN                 0u   /* Enable (1) or Disable (0) code generation for SEMAPHORES     */
#define OS_SEM_ACCEPT_EN          1u   /*    Include code for OSSemAccept()                            */
#define OS_SEM_DEL_EN             1u   /*    Include code for OSSemDel()                               */
#define OS_SEM_PEND_ABORT_EN      1u   /*    Include code for OSSemPendAbort()                         */
#define OS_SEM_QUERY_EN           1u   /*    Include code for OSSemQuery()                             */
#define OS_SEM_SET_EN             1u   /*    Include code for OSSemSet()                               */


                                       /* --------------------- TIME MANAGEMENT ---------------------- */
#define OS_TIME_DLY_HMSM_EN       1u   /*     Include code for OSTimeDlyHMSM()                         */
#define OS_TIME_DLY_RESUME_EN     1u   /*     Include code for OSTimeDlyResume()                       */
#define OS_TIME_GET_SET_EN        1u   /*     Include code for OSTimeGet() and OSTimeSet()             */
#define OS_TIME_TICK_HOOK_EN      1u   /*     Include code for OSTimeTickHook()                        */


                                       /* --------------------- TIMER MANAGEMENT --------------------- */
#define OS_TMR_EN                 0u   /* Enable (1) or Disable (0) code generation for TIMERS         */
#define OS_TMR_CFG_MAX           16u   /*     Maximum number of timers                                 */
#define OS_TMR_CFG_NAME_EN        1u   /*     Determine timer names                                    */
#define OS_TMR_CFG_WHEEL_SIZE     8u   /*     Size of timer wheel (#Spokes)                            */
#define OS_TMR_CFG_TICKS_PER_SEC 10u   /*     Rate at which timer management task runs (Hz)            */

#endif
	 	   	  		 			 	    		   		 		 	 	 			 	    		   	 			 	  	 		 				 		  			 		 					 	  	  		      		  	   		      		  	 		 	      		   		 		  	 		 	      		  		  		  
 		 			 	    		   		 		 	 	 			 	    		   	 			 	  	 		 				 		  			 		 					 	  	  		      		  	   		      		  	 		 	      		   		 		  	 		 	      		  		  		  

在os_cpu.h 中定义一些必要的数据类型及CPU相关配置

c 复制代码
#ifndef __OS_CPU_H__
#define __OS_CPU_H__

#include <REGX52.H>


#define OS_STK_GROWTH	    1u				   // 栈增长方向

#define OS_CRITICAL_METHOD  0u				   // 不安全模式下

#define OS_ENTER_CRITICAL() EA=0			   // 关中断
#define OS_EXIT_CRITICAL()  EA=1			   // 开中断

#define OS_TASK_SW()        OSCtxSw()


typedef unsigned char     BOOLEAN;
typedef unsigned char     INT8U;
typedef signed char       INT8S;
typedef unsigned int      INT16U;
typedef signed int        INT16S;
typedef unsigned long int INT32U;
typedef signed long int   INT32S;
typedef float 			  FP32;
typedef double            FP64;

typedef INT8U             OS_STK;


#endif

添加一个源文件os_cpu_c.c

在里面实现任务堆栈初始化函数OSTaskStkInit

c 复制代码
#include <ucos_ii.h>

OS_STK *OSTaskStkInit(void (*task)(void *p_arg),
                      void *p_arg,
                      OS_STK *ptos,
                      INT16U opt)
{
	(void)(task);
	(void)(p_arg);
	(void)(opt);
    OS_STK* stk = ptos;
    *stk++ = 15;                 	// user stack length
	*stk++ = (INT16U)task & 0xff; 	// task ptr lower 8
	*stk++ = (INT16U)task >> 8;   	// task ptr high 8
	*stk++ = 0xD0;               	// PSW define at regx52.h
	*stk++ = 0xE0;               	// ACC define at regx52.h
	*stk++ = 0xF0;               	// B define at regx52.h
	*stk++ = 0x82;               	// DPL define at regx52.h
	*stk++ = 0x83;               	// DPH define at regx52.h
	*stk++ = (INT16U)p_arg & 0xff;  // arg ptr lower 8
	*stk++ = (INT16U)p_arg >> 8;    // arg ptr high 8
	*stk++ = (INT16U)ptos>>8;     // stack image high 8
	*stk++ = (INT16U)ptos&0xff;       // stack image lower 8
    return ptos;
}

添加一个源文件 os_cpu_asm.c

在里面加入三个函数定义

c 复制代码
void OSStartHighRdy(void) {}
void OSIntCtxSw(void) {}
void OSCtxSw(void) {}

然后点开options配置下面这样

然后translate

就生成了os_cpu_asm.SRC,改后缀为.s 就是汇编源文件,把os_cpu_asm.s 加入到工程来

asm 复制代码
; .\os_cpu_asm.SRC generated from: uCOS-II\Source\os_cpu_asm.c
; COMPILER INVOKED BY:
;        E:\Keil\C51\BIN\C51.EXE uCOS-II\Source\os_cpu_asm.c BROWSE INCDIR(.\uCOS-II\Source;.\User) DEBUG OBJECTEXTEND CODE PRINT(.\os_cpu_asm.lst) SRC(.\os_cpu_asm.SRC)


NAME	OS_CPU_ASM

?PR?OSStartHighRdy?OS_CPU_ASM            SEGMENT CODE 
?PR?OSIntCtxSw?OS_CPU_ASM                SEGMENT CODE 
?PR?OSCtxSw?OS_CPU_ASM                   SEGMENT CODE 
	PUBLIC	OSCtxSw
	PUBLIC	OSIntCtxSw
	PUBLIC	OSStartHighRdy
; void OSStartHighRdy(void) {}

	RSEG  ?PR?OSStartHighRdy?OS_CPU_ASM
OSStartHighRdy:
			; SOURCE LINE # 1
	RET  	
; END OF OSStartHighRdy

; void OSIntCtxSw(void) {}

	RSEG  ?PR?OSIntCtxSw?OS_CPU_ASM
OSIntCtxSw:
			; SOURCE LINE # 2
	RET  	
; END OF OSIntCtxSw

; void OSCtxSw(void) {}
	RSEG  ?PR?OSCtxSw?OS_CPU_ASM
OSCtxSw:
			; SOURCE LINE # 3
	RET  	
; END OF OSCtxSw

	END

现在编译一下,出现了 error C249: 'DATA': SEGMENT TOO LARGE,可以试着把编译内存模式改为大型


下期继续

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