2022-08-25 14:18:18 +08:00
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#include "delay.h"
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static uint8_t UsNumber=0;
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static uint16_t MsNumber=0;
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void Delay_Init()
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{
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2022-08-25 15:47:12 +08:00
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RCC_ClocksTypeDef clocks;
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RCC_GetClocksFreq(&clocks); //??????
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2022-08-25 14:18:18 +08:00
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SysTick_CLKSourceConfig(SysTick_CLKSource_HCLK_Div8);
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2022-08-25 15:47:12 +08:00
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UsNumber=clocks.HCLK_Frequency/HSE_VALUE;
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MsNumber=(u16)UsNumber*1000;
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2022-08-25 14:18:18 +08:00
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}
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void Delay_Us(u32 nus)
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{
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u32 temp;
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SysTick->LOAD=nus*UsNumber;
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SysTick->VAL=0x00;
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SysTick->CTRL|=SysTick_CTRL_ENABLE_Msk ;
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do
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{
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temp=SysTick->CTRL;
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}while((temp&0x01)&&!(temp&(1<<16)));
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SysTick->CTRL&=~SysTick_CTRL_ENABLE_Msk;
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SysTick->VAL =0X00;
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}
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void Delay_Ms(u16 nms)
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{
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u32 temp;
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SysTick->LOAD=(u32)nms*MsNumber;
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SysTick->VAL =0x00;
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SysTick->CTRL|=SysTick_CTRL_ENABLE_Msk ;
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do
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{
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temp=SysTick->CTRL;
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}while((temp&0x01)&&!(temp&(1<<16)));
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SysTick->CTRL&=~SysTick_CTRL_ENABLE_Msk;
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SysTick->VAL =0X00;
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}
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