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/* *****************************************************************************
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Created: 12/18/09 02:37:37
* Copyright (c) 2009 Perry L. Hung. All rights reserved.
*
* ****************************************************************************/
/**
* @file systick.h
*
* @brief Various system timer definitions
*/
#ifndef _SYSTICK_H_
#define _SYSTICK_H_
#include "libmaple.h"
/* To the ARM technical manual... there's nearly nothing on the systick
* timer in the stm32 manual */
#define SYSTICK_CSR 0xE000E010 // Control and status register
#define SYSTICK_RELOAD 0xE000E014 // Reload value register
#define SYSTICK_CNT 0xE000E018 // Current value register
#define SYSTICK_CALIB 0xE000E01C // Calibration value register
#define SYSTICK_SRC_HCLK BIT(2) // Use core clock
#define SYSTICK_TICKINT BIT(1) // Interrupt on systick countdown
#define SYSTICK_ENABLE BIT(0) // Turn on the counter
/* We use the systick timer to tick once
* every millisecond */
#define MAPLE_RELOAD_VAL 72000
#ifdef __cplusplus
extern "C"{
#endif
void systick_init(void);
static inline uint32_t systick_get_count(void) {
return (uint32_t)*(volatile uint32*)SYSTICK_CNT;
}
#ifdef __cplusplus
} // extern "C"
#endif
#endif
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