我在目标板上已经试验也好了，测量频率从0.1hz到50kHz。且精度较高！
下面是我的最终代码：
void TIM2_IRQHandler(void)
{
static u16 Capture_Value1 = 0; /* value of the TIM2 capture */
u16 Capture_Value2 = 0;
static u16 Overflow_Counter = 0;
u16 TIM2_SR=0;
static u8 flag=0;
u8 i=0;
u16 Auto_Reload_REG;
Auto_Reload_REG = TIM2->ARR ;
TIM2_SR = TIM2->SR;
if((TIM2_SR & 0x0003) == (u16)0x0003)
{
TIM2->SR &= ~((u16)0x0003);
if(flag != 1 )
{
Capture_Value1 = TIM2->CCR1;
flag = 1;
}
else
{
Capture_Value2 = TIM2->CCR1;
if(Capture_Value2 >= Capture_Value1)
{
Channel1_Frequency = 360000000/((Overflow_Counter+1) * (Auto_Reload_REG+1) - (Capture_Value2 - Capture_Value1));
Capture_Value1 = Capture_Value2;
Overflow_Counter = 0;
}
else
{
Channel1_Frequency = 360000000/(Overflow_Counter * (Auto_Reload_REG+1) + (Capture_Value1 - Capture_Value2));
Capture_Value1 = Capture_Value2;
Overflow_Counter = 1;
}
}
}
else if(TIM2_SR & 0x0002)
{
TIM2->SR &= ~((u16)0x0002);
if(flag != 1 )
{
Capture_Value1 = TIM2->CCR1;
flag = 1;
}
else
{
Capture_Value2 = TIM2->CCR1;
if(Capture_Value2 >= Capture_Value1)
{
Channel1_Frequency = 360000000/(Overflow_Counter * (Auto_Reload_REG+1) - (Capture_Value2 - Capture_Value1));
Capture_Value1 = Capture_Value2;
Overflow_Counter = 0;
}
else
{
Channel1_Frequency = 360000000/(Overflow_Counter * (Auto_Reload_REG+1) + (Capture_Value1 - Capture_Value2));
Capture_Value1 = Capture_Value2;
Overflow_Counter = 0;
}
}
}
else if( TIM2_SR & 0x0001 )
{
TIM2->SR &= ~((u16)0x0001);
Overflow_Counter++;
}
} |
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