nuclei-sdk/application/baremetal/demo_timer/main.c

// See LICENSE for license details.
#include <stdio.h>
#include "nuclei_sdk_soc.h"

/* NOTE: Make sure the interrupt function name for time interrupt and software time interrupt are
 * irqc_mtip_handler and irqc_msip_handler */

static volatile uint32_t int0_cnt = 0;    /* mtip timer interrupt test counter */
static volatile uint32_t int1_cnt = 0;    /* msip timer interrupt test counter */
volatile unsigned int msip_trig_flag = 1; /* sw trigger mtimer sw interrupt flag */

#define LOOP_COUNT      5

/* TODO uncomment below to enable timer interrupt via reset timer load register
 * and not update timecmp register */
//#define TIMER_RELOAD

#define RELOAD_TICKS        SOC_TIMER_FREQ / 10

__INTERRUPT void irqc_mtip_handler(void)
{
    int0_cnt++;
    printf("MTimer IRQ handler %d\n\r", int0_cnt);

#ifdef TIMER_RELOAD
    SysTimer_SetLoadValue(0);
#else
    SysTick_Reload(RELOAD_TICKS);
#endif
}

__INTERRUPT void irqc_msip_handler(void)
{
    SysTimer_ClearSWIRQ();
    int1_cnt++;
    printf("MTimer SW IRQ handler %d\n\r", int1_cnt);
    msip_trig_flag = 1;
}

void setup_timer()
{
    printf("init timer and start\n\r");

#ifdef TIMER_RELOAD
    SysTimer_SetLoadValue(0);
    SysTimer_SetCompareValue(RELOAD_TICKS);
#else
    SysTick_Reload(RELOAD_TICKS);
#endif
}

#ifdef CFG_SIMULATION
#define RUN_LOOPS   2
#else
#define RUN_LOOPS   5
#endif

int main(void)
{
    uint32_t returnCode;

    setup_timer(); /* initialize timer */

    // TODO you can register new handler only when your vector table is RW
    // otherwise please make sure pass NULL, and use the correct interrupt handler name defined
    // in system_<Device>.c
    returnCode = IRQC_Register_IRQ(SysTimer_IRQn, NULL); /* register system timer interrupt */

    __enable_irq(); /* enable global interrupt */

    while (int0_cnt < RUN_LOOPS);
    IRQC_DisableIRQ(SysTimer_IRQn); /* Disable MTIP iterrupt */

    // TODO you can register new handler only when your vector table is RW
    returnCode = IRQC_Register_IRQ(SysTimerSW_IRQn, NULL); /* register system timer SW interrupt */

    do {
        if (msip_trig_flag == 1) {
            msip_trig_flag = 0;
            SysTimer_SetSWIRQ(); /* trigger timer sw interrupt */
            // WARN take care when you modify time load register, below function may fail
            delay_1ms(10);
        }
    } while (int1_cnt < RUN_LOOPS); /* check test end condition */

    printf("MTimer msip and mtip interrupt test finish and pass\r\n");

    if (returnCode != 0) { /* Check return code for errors */
        return -1;
    }

    return 0;
}