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#ifndef _SYSTICK_H_
#define _SYSTICK_H_
#include <inttypes.h>
#include "util.h"
/* To the ARM technical manual... there's nearly nothing on the systick
* timer in the stm32 manual */
#define SYSTICK_CSR *(volatile int*)0xE000E010 // Control and status register
#define SYSTICK_RELOAD *(volatile int*)0xE000E014 // Reload value register
#define SYSTICK_CNT *(volatile int*)0xE000E018 // Current value register
#define SYSTICK_CALIB *(volatile int*)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)SYSTICK_CNT;
}
#ifdef __cplusplus
} // extern "C"
#endif
#endif
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