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/*
* Copyright (c) 2006-2024, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2024-01-01 RTT the first version, generic i.MX RT DWT driver
*/
#ifndef DRV_DWT_H__
#define DRV_DWT_H__
#include <rtthread.h>
#include <stdint.h>
#ifdef BSP_USING_DWT
#ifdef __cplusplus
extern "C" {
#endif
/**
* Initialize the DWT cycle counter.
* Enables the CoreDebug trace and sets CYCCNTENA in DWT_CTRL.
* Must be called before using any other dwt_* functions.
*
* @return RT_EOK on success, -RT_ERROR if DWT is not available.
*/
rt_err_t dwt_init(void);
/**
* Read the current DWT cycle counter value.
*
* @return 32-bit free-running cycle count. Wraps around after 2^32 cycles.
*/
rt_uint32_t dwt_get_cycles(void);
/**
* Convert a DWT cycle count difference to microseconds.
* Uses the CMSIS SystemCoreClock variable for the conversion.
*
* @param cycles number of cycles to convert
* @return elapsed time in microseconds
*/
rt_uint32_t dwt_cycles_to_us(rt_uint32_t cycles);
/**
* Busy-wait delay using the DWT cycle counter.
* dwt_init() must have been called before using this function.
*
* @param us delay duration in microseconds
*/
void dwt_delay_us(rt_uint32_t us);
#ifdef __cplusplus
}
#endif
#endif /* BSP_USING_DWT */
#endif /* DRV_DWT_H__ */
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