xushaoxiang
69 lines
1.7 KiB
C
69 lines
1.7 KiB
C
/*!
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* \file xc_drv_systick.c
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*
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* \brief Target xinchip systick driver implementation
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*
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* \copyright Revised BSD License, see section \ref LICENSE.
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*
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* \code
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*
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* _ __ _ ________ _
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* | |/ /(_)___ / ____/ /_ (_)___
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* | // / __ \/ / / __ \/ / __ \
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* / |/ / / / / /___/ / / / / /_/ /
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* /_/|_/_/_/ /_/\____/_/ /_/_/ .___/
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* /_/
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* (C) 2022-2025 XinChip
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*
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* \endcode
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*
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* \author ( XinChip ) Alex-J
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*
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* \author ( XinChip )
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*/
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/*-----------------------------------------------------------------------------------
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INCLUDE HEADE FILES
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------------------------------------------------------------------------------------*/
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#include "xc_drv_systick.h"
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#include "xc_drv_clock.h"
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/*------------------------------------------------------------------------------------
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Functions
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-------------------------------------------------------------------------------------*/
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void SysTick_Handler(void) { systick_callback(); }
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void delay_us(uint32_t nus)
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{
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if (nus == 0)
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return;
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uint32_t unit = xc_systick_unit_get();
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uint32_t temp;
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SysTick->CTRL = 0x00; // 关闭计数器
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SysTick->LOAD = unit * nus - unit + 1;
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SysTick->VAL = 0;
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SysTick->CTRL = 0x05;
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do {
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temp = SysTick->CTRL; // 读取当前倒计数值
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} while ((temp & 0x01) && (!(temp & (1 << 16))));
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}
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void delay_ms(uint32_t nms)
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{
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if (nms == 0) {
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return;
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}
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do {
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delay_us(1000);
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} while (--nms);
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}
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__WEAK void systick_callback(void) {}
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