我也来玩玩多线程（终结篇）-LPC1114

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我也来玩玩多线程（终结篇）-LPC1114 [复制链接]

前两个帖子里分别以不同的方式实现的LED的闪烁，今天再以信号量的方式来实现LED的闪烁。程序里一共用到了两个信号量，分别为io_sem和delay_sem，这两个信号量就类似一个互斥的变量，使得程序交替运行延时和IO反转的进程。下面上传源代码，同样附件里放工程文件。

#include "LPC11xx.h" /* LPC11xx Peripheral Registers */
#include "gpio.h"
#include "pt.h"
#include "pt-sem.h"

char flag = 0;
static struct pt_sem delay_sem,io_sem;

typedef unsigned char uint8;                  //defined for unsigned 8-bits integer variable
typedef signed   char int8;                   //defined for signed 8-bits integer variable
typedef unsigned int uint16;                 //defined for unsigned 16-bits integer variable
typedef signed   int int16;                  //defined for signed 16-bits integer variable
typedef unsigned long   uint32;                 //defined for unsigned 32-bits integer variable
typedef signed   long   int32;                  //defined for signed 32-bits integer variable
typedef float          fp32;                   //single precision floating point variable (32bits)
typedef double         fp64;                   //double precision floating point variable (64bits)

void Delay(uint16 dly);
void DelayMs(uint16 dly);
static PT_THREAD(togio_thread(struct pt *pt));//
static PT_THREAD(delay_thread(struct pt *pt));
static PT_THREAD(schedule_thread(struct pt *pt));
/*****************************************************************************
**   Main Function main()
******************************************************************************/
int main (void)
{
struct pt schedule_pt;
/* Basic chip initialization is taken care of in SystemInit() called
   * from the startup code. SystemInit() and chip settings are defined
   * in the CMSIS system_<part family>.c file.
   */
GPIOInit();
/* use port0_7 as output event*/
GPIOSetDir( PORT0, 7, 1 );
/* Initialize the protothread state variables with PT_INIT(). */
    PT_INIT(&schedule_pt);

while(PT_SCHEDULE(schedule_thread(&schedule_pt)) )
{
   ;
   };
return 0;
}
/*
*************************************************************************************************************
** Function name   : Delay
** Descriptions    : Delay
** Global variables:
** Input parameters:
** Returned value :
** Calling modules :
** Example     :
** Created by      : LiXiaohai
** Created date    : 2010-04-29
**-----------------------------------------------------------------------------------------------------------
** Modified by     :
** Modified date   :
**-----------------------------------------------------------------------------------------------------------
*************************************************************************************************************
*/
void DelayMs(uint16 dly)
{
while(dly--)
{
  Delay(2678);
}
}
/*
*************************************************************************************************************
** Function name   : void Delay(uint16 dly)
** Descriptions    : Delay
** Global variables:
** Input parameters:
** Returned value :
** Calling modules :
** Example     :
** Created by      : LiXiaohai
** Created date    : 2010-04-29
**-----------------------------------------------------------------------------------------------------------
** Modified by     :
** Modified date   :
**-----------------------------------------------------------------------------------------------------------
*************************************************************************************************************
*/
void Delay(uint16 dly)
{
while(dly--);
}
/**
* Declare the first protothread function-toggleIO protothread
*/
static PT_THREAD(togio_thread(struct pt *pt))
{
PT_BEGIN(pt);/*start of toggleIO protothread*/
PT_SEM_WAIT(pt,&delay_sem);
    flag = ~flag;
    GPIOSetValue(PORT0,7,flag);/*IO toggle*/
    PT_SEM_SIGNAL(pt,&io_sem);
    PT_END(pt);   /*declare the end of the toggleIO protothread*/
}
/**
* Declare the second protothread function-delay protothread
*/
static PT_THREAD(delay_thread(struct pt *pt))
{
PT_BEGIN(pt); /*start of delay protothread*/
PT_SEM_WAIT(pt,&io_sem);
DelayMs(500);/*delay 500ms*/
PT_SEM_SIGNAL(pt,&delay_sem);
PT_END(pt);    /*declare the end of the delay protothread*/
}
/**
* Declare the third protothread function-schedule protothread
*/
static PT_THREAD(schedule_thread(struct pt *pt))
{
static struct pt delay_pt, togio_pt;
PT_BEGIN(pt); /*start of delay protothread*/
PT_SEM_INIT(&io_sem,0);
PT_SEM_INIT(&delay_sem,1);
PT_INIT(&delay_pt);
PT_INIT(&togio_pt);
while(1)
{
  PT_WAIT_THREAD(pt,delay_thread(&delay_pt)&togio_thread(&togio_pt));
}
PT_END(pt);    /*declare the end of the delay protothread*/
}