task.c

这是基于arm的嵌入式操作系统基础性实验ADC实验

#define IN_TASK
#include   "config.h"
#include   "task.h"
#include   "spi.h"

OS_STK           TaskStartStk[TaskStkLengh];         /* Startup    task stack                         */                        
OS_STK           Task1Stk[TaskStkLengh];             /* Task #1    task stack                         */
OS_STK           Task2Stk[TaskStkLengh];             /* Task #2    task stack                         */
OS_STK           Task3Stk[TaskStkLengh]; 
OS_STK           Task4Stk[TaskStkLengh]; 

OS_EVENT        *AckMbox;                            /* Message mailboxes for Tasks #1 and #2         */
OS_EVENT        *TxMbox1;
OS_EVENT        *TxMboxSPI;
OS_EVENT        *AckMboxSPI;
OS_EVENT        *MainSem;                            //用于整个程序的信号量


uint32 LED1 = (1 << 18);	                    // P1.18控制LED1，高电平点亮
uint32 LED2 = (1 << 17);

void Task1	(void *pdata)
{
	char   *rxmsg;
	INT8U  err;
	char   txmsg=1; 
	pdata = pdata;
	TargetInit ();
    OSStatInit();
	while (1)
	{
		IO1SET = LED1;			              // LED1点亮
		OSTimeDlyHMSM(0, 0, 0, 100 ); 
		IO1CLR = LED1;			              // LED1熄灭
		OSTimeDlyHMSM(0, 0, 0, 100 ); 
		IO1SET = LED1;			              // LED1点亮
		OSTimeDlyHMSM(0, 0, 0, 100 ); 
		IO1CLR = LED1;			              // LED1熄灭
		OSTimeDlyHMSM(0, 0, 0, 100 ); 
		OSMboxPost(TxMbox1, (void *)&txmsg);       /* Send message to Task #2*/                                  
        rxmsg = (char *)OSMboxPend(AckMboxSPI, 0, &err);        /* Wait for acknowledgement from Task #2              */
   	    
	}
}

void Task2	(void *pdata)
{

    char   *rxmsg;
    
    INT8U  err;
    pdata = pdata;
	while (1)
	{
        OSSemPend(MainSem, 0, &err);
        rxmsg = (char *)OSMboxPend(TxMbox1, 0, &err);              /* Wait for message from Task #1 */

        IO1SET=((*rxmsg)<<17);                                    //控制P0.0~P0.7 
        txmsgSPI++;

        //OSMboxPost(AckMbox, (void *)1);
        OSMboxPost(TxMboxSPI, (void *)&txmsgSPI);
        
        OSTimeDlyHMSM(0, 0, 0, 500);                                    /* Wait 10 milsecond                 */
        IO1CLR=LED2;
        OSSemPost(MainSem);
    }
}


void Task3	(void *pdata)
{
  uint8 temp;
  INT8U  err;
  char   *rxmsgSPI;
  pdata = pdata;                                                  /* 避免编译警告 */

    //SPIInit(0x30);                                                   /* 目标板初始化 */
    PINSEL0 = (PINSEL0 & 0xffff00ff) | 0x1500;
    IO0DIR = HC595_CS;
    
    while (1)
    {
            OSSemPend(MainSem, 0, &err);
            OSMboxPost(AckMboxSPI, (void *)1);
            
            rxmsgSPI = (char *)OSMboxPend(TxMboxSPI, 0, &err);

            SPIStart();
            IO0CLR = HC595_CS;
            SPIRW(&temp, ~ShowTable[*rxmsgSPI]);
            IO0SET = HC595_CS;
            SPIEnd();

            OSTimeDlyHMSM(0, 0, 0, 300 );          /* Wait 1 second  */            
            OSSemPost(MainSem);
    }
}