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#pragma once
#include "stm32.h"
#include "nvic.h"
typedef enum {
//! Specifies a one-shot timer. After notification timer is discarded.
modeOneShot = 1,
//! Specifies a repeating timer.
modeRepeating = 2,
//! Specifies a persisten start / stop timer.
modeTimeout = 3,
modeStarted = 0x40
} bl_timer_modes_t;
typedef uint8_t bl_timer_id;
typedef uint32_t time_ms_t;
typedef volatile time_ms_t* time_ref_t;
typedef uint32_t time_hrt_cycles_t;
typedef void (*bl_timer_ontimeout)(bl_timer_id id, void *context);
typedef struct {
void *context;
bl_timer_ontimeout cb;
} bl_timer_cb_t;
extern bl_timer_cb_t null_cb;
void timer_init(void);
bl_timer_id timer_allocate(bl_timer_modes_t mode, time_ms_t msfromnow, bl_timer_cb_t *fc);
void timer_free(bl_timer_id id);
void timer_start(bl_timer_id id);
void timer_restart(bl_timer_id id, time_ms_t ms);
void timer_stop(bl_timer_id id);
int timer_expired(bl_timer_id id);
time_ms_t timer_tic(void);
time_ref_t timer_ref(bl_timer_id id);
static inline int timer_ref_expired(time_ref_t ref)
{
return *ref == 0;
}
#define TIMER_HRT_CYCLES_PER_US (STM32_HCLK_FREQUENCY/1000000)
#define TIMER_HRT_CYCLES_PER_MS (STM32_HCLK_FREQUENCY/1000)
static inline time_hrt_cycles_t timer_hrt_read(void)
{
return getreg32(NVIC_SYSTICK_CURRENT);
}
static inline time_hrt_cycles_t timer_hrt_max(void)
{
return getreg32(NVIC_SYSTICK_RELOAD) + 1;
}
static inline time_hrt_cycles_t timer_hrt_elapsed(time_hrt_cycles_t begin, time_hrt_cycles_t end)
{
/* It is a down count from NVIC_SYSTICK_RELOAD */
time_hrt_cycles_t elapsed = begin - end;
time_hrt_cycles_t reload = timer_hrt_max();
/* Did it wrap */
if (elapsed > reload) {
elapsed += reload;
}
return elapsed;
}
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