54 lines
1.5 KiB
C
54 lines
1.5 KiB
C
/*
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* Copyright (C) 2023 Daniele Lacamera <root@danielinux.net>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "systick.h"
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#include "task.h"
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#include <stdint.h>
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/*** SYSTICK ***/
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volatile uint32_t SystemCoreClock = 216000000;
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#define SYSTICK_BASE (0xE000E010)
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#define SYSTICK_CSR (*(volatile uint32_t *)(SYSTICK_BASE + 0x00))
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#define SYSTICK_RVR (*(volatile uint32_t *)(SYSTICK_BASE + 0x04))
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#define SYSTICK_CVR (*(volatile uint32_t *)(SYSTICK_BASE + 0x08))
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#define SYSTICK_CALIB (*(volatile uint32_t *)(SYSTICK_BASE + 0x0C))
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volatile unsigned int jiffies = 0;
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void systick_enable(void)
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{
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SYSTICK_RVR = ((SystemCoreClock / 1000) - 1);
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SYSTICK_CVR = 0;
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SYSTICK_CSR |= 0x07;
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}
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void systick_disable(void)
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{
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SYSTICK_CSR &= ~1;
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}
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void isr_systick(void)
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{
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++jiffies;
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trigger_event(EV_SYSTICK);
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}
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uint32_t HAL_GetTick(void)
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{
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return jiffies;
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}
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