LiteOS学习第六篇——任务堆栈初始化

来源：互联网发布：大数据调查问卷模板编辑：程序博客网时间：2024/05/01 16:24

函数：

LITE_OS_SEC_TEXT_INIT VOID *osTskStackInit(UINT32 uwTaskID, UINT32 uwStackSize, VOID *pTopStack)
{
UINT32 uwIdx;
TSK_CONTEXT_S *pstContext;

/*initialize the task stack, write magic num to stack top*/
for (uwIdx = 1; uwIdx < (uwStackSize/sizeof(UINT32)); uwIdx++)
{
*((UINT32 *)pTopStack + uwIdx) = OS_TASK_STACK_INIT;
}
*((UINT32 *)(pTopStack)) = OS_TASK_MAGIC_WORD;

pstContext = (TSK_CONTEXT_S *)(((UINT32)pTopStack + uwStackSize) - sizeof(TSK_CONTEXT_S));
#if 0
pstContext->S16 = 0xAA000010;
pstContext->S17 = 0xAA000011;
pstContext->S18 = 0xAA000012;
pstContext->S19 = 0xAA000013;
pstContext->S20 = 0xAA000014;
pstContext->S21 = 0xAA000015;
pstContext->S22 = 0xAA000016;
pstContext->S23 = 0xAA000017;
pstContext->S24 = 0xAA000018;
pstContext->S25 = 0xAA000019;
pstContext->S26 = 0xAA00001A;
pstContext->S27 = 0xAA00001B;
pstContext->S28 = 0xAA00001C;
pstContext->S29 = 0xAA00001D;
pstContext->S30 = 0xAA00001E;
pstContext->S31 = 0xAA00001F;
#endif
pstContext->uwR4 = 0x04040404L;
pstContext->uwR5 = 0x05050505L;
pstContext->uwR6 = 0x06060606L;
pstContext->uwR7 = 0x07070707L;
pstContext->uwR8 = 0x08080808L;
pstContext->uwR9 = 0x09090909L;
pstContext->uwR10 = 0x10101010L;
pstContext->uwR11 = 0x11111111L;
pstContext->uwPriMask = 0;
pstContext->uwR0 = uwTaskID;
pstContext->uwR1 = 0x01010101L;
pstContext->uwR2 = 0x02020202L;
pstContext->uwR3 = 0x03030303L;
pstContext->uwR12 = 0x12121212L;
pstContext->uwLR = (UINT32)osTaskExit;
pstContext->uwPC = (UINT32)osTaskEntry;
pstContext->uwxPSR = 0x01000000L;
#if 0
pstContext->S0 = 0xAA000000;
pstContext->S1 = 0xAA000001;
pstContext->S2 = 0xAA000002;
pstContext->S3 = 0xAA000003;
pstContext->S4 = 0xAA000004;
pstContext->S5 = 0xAA000005;
pstContext->S6 = 0xAA000006;
pstContext->S7 = 0xAA000007;
pstContext->S8 = 0xAA000008;
pstContext->S9 = 0xAA000009;
pstContext->S10 = 0xAA00000A;
pstContext->S11 = 0xAA00000B;
pstContext->S12 = 0xAA00000C;
pstContext->S13 = 0xAA00000D;
pstContext->S14 = 0xAA00000E;
pstContext->S15 = 0xAA00000F;
pstContext->FPSCR = 0x00000000;
pstContext->NO_NAME = 0xAA000011;
#endif
return (VOID *)pstContext;

}

针对cotex M0 内核xPSR，PC，LR，R12，R3-R0被自动保存到栈中的，R11-R4如果需要保存，只能手工保存

xPSR的初始值要保证第24为为1才不会异常

PC赋任务入口函数地址

LR赋任务退出函数地址

R0赋形式参数

PriMask 赋0 //这里为什么赋0？

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