CH32V307_FreeRTOS_Hello/src/freertos_helper.c

#include "FreeRTOS.h"
#include "task.h"

#include "ch32v30x.h"
#include "system_ch32v30x.h"

/**
 * @brief Initialize SysTick interrupt.
 * 
 */
void vPortSetupTimerInterrupt(void) {
    /* Configure SysTick and interrupts. */
    SysTick->SR = 0UL;
    SysTick->CTLR = 0UL;
    SysTick->CNT = 0UL;

    NVIC_EnableIRQ(SysTicK_IRQn);

    SysTick->CMP = (uint64_t)((SystemCoreClock / (configTICK_RATE_HZ * 8)) - 1);
    SysTick->CTLR = 0x1A; /* COUNTDOWN | AUTO RELOAD | HCLK/8 | INT */
    SysTick->CTLR |= 0x20; /* INIT */

    SysTick->CTLR |= 0x01; /* EN */
}