main.c

来自「ARM公司ATC培训的所有练习源码」· C语言 代码 · 共 58 行

#include "nvic.h"
#include "uart.h"
#include "timer.h"
#include <stdio.h>
#include "cortexm3.h"

#include "pseudo_intrinsics.h"

#define REGION_128K 0x20
#define REGION_256K 0x22
#define REGION_512K 0x24
#define REGION_1M   0x26

int main(void)
{
    volatile int delay=0;

    int SYSm;
    
    NVIC_init();
    UART_init();
    SysTick_init();

    /* Change Thread mode to unprivileged
     * but continue using main stack pointer */
    SYSm = __MRS_control();
    SYSm |= 1;
    __MSR_control(SYSm);

#if defined SVCHANDLER
    //Call svc here
#else
    printf("Hello world! Retargeted M3 library\n\r");
#endif
//	scanf("%s",input);

    /* Loop forever */
    while( 1 )
    {
#if defined SYSTICK_INTERRUPT
#if defined SVCHANDLER
        //call svc here
#else
        printf("Foreground loop printing long message that should not be interrupted otherwise the interleaved foreground and background messages won't make any sense at all\n\r");
#endif /* SVCHANDLER */

        delay=1000000;
        while(--delay > 0)
        {
        }

        /* Sleep and wait for SysTick (or something else) to interrupt */
        __WFI();
#endif
    }
    return 1;
}