os_core/os_cpu_c.c

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/***********************************
* Operation System Target File
* Function: Cpu dependent c language file 
*           for task stack initial
*
* File:   os_cpu_c.c
* Author: Book Chen
* Date: 2008.07.18
************************************
*/
#include "includes.h"

OS_STK *OSTaskStkInit(void (*Task)(void),void *pdata,OS_STK *ptos, INT16U opt){

    //pdata=pdata; // no do this...warning??? let it be.      
    opt=opt;
    ptos--;
    *ptos--=(OS_STK)Task;  // r15...pc
    *ptos--=(OS_STK)Task;  // r14...lr
    *ptos--=12;   //r12
    *ptos--=11;   //r11
    *ptos--=10;   //r10
    *ptos--=9;    //r9
    *ptos--=8;    //r8
    *ptos--=7;    //r7
    *ptos--=6;    //r6
    *ptos--=5;    //r5
    *ptos--=4;    //r4
    *ptos--=3;    //r3
    *ptos--=2;    //r2
    *ptos--=1;    //r1
    *ptos--=0;    //r0
    *ptos=0x1f;   // cpsr system mode, enable IRQ.FIQ    
    return ptos;
}

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