/*
 * Copyright (C) 2023 Daniele Lacamera <root@danielinux.net>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "systick.h"
#include "task.h"
#include <stdint.h>
/*** SYSTICK ***/
volatile uint32_t SystemCoreClock = 216000000;

#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 = ((SystemCoreClock / 1000) - 1);
    SYSTICK_CVR = 0;
    SYSTICK_CSR |= 0x07;
}

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

void isr_systick(void)
{
    ++jiffies;
    trigger_event(EV_SYSTICK);
}

uint32_t HAL_GetTick(void)
{
    return jiffies;
}