gadget-kspconsole/systick.c

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2023-11-27 15:13:55 +01:00
/*
* 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;
}