做外贸一般总浏览的网站,网络编程就是做网站么,wordpress批量修改字体大小,研发网站要多长时间两个习题 先了解下CPU上函数调用的过程: 一个程序取得函数地址#xff0c;先保护现场将局部变量及参数压栈#xff0c;再将调用函数的参数压栈#xff0c;然后跳转到函数位置#xff0c;将参数出栈#xff0c;执行代码#xff0c;结束后返回到调用位置#xff0c;再怖复…两个习题 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。 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
#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
#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() EA0 // 关中断
#define OS_EXIT_CRITICAL() EA1 // 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
#include ucos_ii.hOS_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)ptos8; // stack image high 8*stk (INT16U)ptos0xff; // stack image lower 8return ptos;
}添加一个源文件 os_cpu_asm.c 在里面加入三个函数定义
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
; .\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 OSCtxSwPUBLIC OSIntCtxSwPUBLIC OSStartHighRdy
; void OSStartHighRdy(void) {}RSEG ?PR?OSStartHighRdy?OS_CPU_ASM
OSStartHighRdy:; SOURCE LINE # 1RET
; END OF OSStartHighRdy; void OSIntCtxSw(void) {}RSEG ?PR?OSIntCtxSw?OS_CPU_ASM
OSIntCtxSw:; SOURCE LINE # 2RET
; END OF OSIntCtxSw; void OSCtxSw(void) {}RSEG ?PR?OSCtxSw?OS_CPU_ASM
OSCtxSw:; SOURCE LINE # 3RET
; END OF OSCtxSwEND
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
