main.c内容如下：
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#include "stdio.h"#define OS_EXCEPT_STK_SIZE 1024#define TASK_1_STK_SIZE 1024#define TASK_2_STK_SIZE 1024typedef unsigned int OS_STK;typedef void (*OS_TASK)(void);typedef struct OS_TCB{ OS_STK *StkAddr;}OS_TCB,*OS_TCBP;OS_TCBP g_OS_Tcb_CurP; OS_TCBP g_OS_Tcb_HighRdyP;static OS_STK OS_CPU_ExceptStk[OS_EXCEPT_STK_SIZE];OS_STK *g_OS_CPU_ExceptStkBase;static OS_TCB TCB_1;static OS_TCB TCB_2;static OS_STK TASK_1_STK[TASK_1_STK_SIZE];static OS_STK TASK_2_STK[TASK_2_STK_SIZE];extern void OSStart_Asm(void);extern void OSCtxSw(void);void Task_Switch(){ if(g_OS_Tcb_CurP == &TCB_1) g_OS_Tcb_HighRdyP=&TCB_2; else g_OS_Tcb_HighRdyP=&TCB_1; OSCtxSw();}void task_1(){ printf("Task 1 Running!!!\n"); Task_Switch(); printf("Task 1 Running!!!\n"); Task_Switch();}void task_2(){ printf("Task 2 Running!!!\n"); Task_Switch(); printf("Task 2 Running!!!\n"); Task_Switch();}void Task_End(void){ printf("Task End\n"); while(1) {}}void Task_Create(OS_TCB *tcb,OS_TASK task,OS_STK *stk){ OS_STK *p_stk; p_stk = stk; p_stk = (OS_STK *)((OS_STK)(p_stk) & 0xFFFFFFF8u); *(--p_stk) = (OS_STK)0x01000000uL; //xPSR *(--p_stk) = (OS_STK)task; // Entry Point *(--p_stk) = (OS_STK)Task_End; // R14 (LR) *(--p_stk) = (OS_STK)0x12121212uL; // R12 *(--p_stk) = (OS_STK)0x03030303uL; // R3 *(--p_stk) = (OS_STK)0x02020202uL; // R2 *(--p_stk) = (OS_STK)0x01010101uL; // R1 *(--p_stk) = (OS_STK)0x00000000u; // R0 *(--p_stk) = (OS_STK)0x11111111uL; // R11 *(--p_stk) = (OS_STK)0x10101010uL; // R10 *(--p_stk) = (OS_STK)0x09090909uL; // R9 *(--p_stk) = (OS_STK)0x08080808uL; // R8 *(--p_stk) = (OS_STK)0x07070707uL; // R7 *(--p_stk) = (OS_STK)0x06060606uL; // R6 *(--p_stk) = (OS_STK)0x05050505uL; // R5 *(--p_stk) = (OS_STK)0x04040404uL; // R4 tcb->StkAddr=p_stk;}int main(){ g_OS_CPU_ExceptStkBase = OS_CPU_ExceptStk + OS_EXCEPT_STK_SIZE - 1; Task_Create(&TCB_1,task_1,&TASK_1_STK[TASK_1_STK_SIZE-1]); Task_Create(&TCB_2,task_2,&TASK_2_STK[TASK_1_STK_SIZE-1]); g_OS_Tcb_HighRdyP=&TCB_1; OSStart_Asm(); return 0;} |
