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/* *****************************************************************************
* The MIT License
*
* Copyright (c) 2010 Perry Hung.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
* ****************************************************************************/
/**
* @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 systick_get_count(void) {
return (uint32)*(volatile uint32*)SYSTICK_CNT;
}
#ifdef __cplusplus
} // extern "C"
#endif
#endif
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