gadget-tester/systick.c

/* 
 * (c) danielinux 2019
 *
 *      GPLv.2
 *
 * See LICENSE for details
 */
#include "system.h"
#include "systick.h"
#include <stdint.h>
/*** SYSTICK ***/

#define SYSTICK_BASE (0xE000E010)
#define SYSTICK_CSR     (*(volatile uint32_t *)(SYSTICK_BASE + 0x00))
#define SYSTICK_RVR     (*(volatile uint32_t *)(SYSTICK_BASE + 0x04))
#define SYSTICK_CVR     (*(volatile uint32_t *)(SYSTICK_BASE + 0x08))
#define SYSTICK_CALIB   (*(volatile uint32_t *)(SYSTICK_BASE + 0x0C))

volatile unsigned int jiffies = 0;


void systick_enable(void)
{
    SYSTICK_RVR = ((cpu_freq / 1000) - 1);
    SYSTICK_CVR = 0;
    SYSTICK_CSR |= 0x07;
}

void systick_disable(void)
{
    SYSTICK_CSR &= ~1;
}

void isr_systick(void)
{
    ++jiffies;
}

uint32_t HAL_GetTick(void)
{
    return jiffies;
}