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#include "stm32f10x.h"
#include "delay.h"
#include "12864.h"
#include "stdio.h"
#include "usart.h"
#include "sys.h"
u8 TIM3CH1_CAPTURE_STA=0; //輸入捕獲狀態
//[7]:捕獲兩個上升沿
//[6]:捕獲到第一個上升沿
//[5:0]:溢出計時器
u32 TIM3CH1_CAPTURE_VAL; //輸入捕獲值
void TIM2_PWMconf(u16 arr,u16 psc);
void TIM3_Cap_Init(u16 arr,u16 psc);
void MY_GPIO(void);
/***********************main***************************
函數:main
描述：
******************************************************/
u8 flag,flag2;
int main(void)
{
u32 temp=0,freqdisplay=0;
double freq,temp1;
GPIO_InitTypeDef mygpio;
delay_init();
NVIC_Configuration();
uart_init(9600);
Lcd12864_init();
lcd_clr();
MY_GPIO();
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
mygpio.GPIO_Mode=GPIO_Mode_Out_PP;
mygpio.GPIO_Pin=GPIO_Pin_0;
mygpio.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOA,&mygpio);
Display();
TIM2_PWMconf(899,5555); //不分頻。PWM頻率=72000/(899+1)=80Khz
TIM3_Cap_Init(0xffff,72-1); //以1Mhz的頻率計數
while(1)
{
//delay_ms(10);
if(TIM3CH1_CAPTURE_STA&0X80) //成功捕獲到了一次上升沿
{
temp1=TIM3CH1_CAPTURE_STA&0X3F;
printf("周期0:%f us\r\n",temp1);
//freq=temp1;
temp1*=65536; //溢出時間總和
//printf("周期1:%f us\r\n",temp1);
//temp1+=2.5;
temp1+=TIM3CH1_CAPTURE_VAL; //得到總的高電平時間
//printf("周期2:%d us\r\n",TIM3CH1_CAPTURE_VAL);
//printf("周期3:%f us\r\n",temp1);
//temp1*=1000;
temp=temp1;
freq=1000000.0/temp;
addr_choose(2,0);
Write_data_12864(0x30+temp/100000);
Write_data_12864(0x30+temp%100000/10000);
Write_data_12864(0x30+temp%10000/1000);
Write_data_12864(0x2e);
Write_data_12864(0x30+temp%1000/100);
Write_data_12864(0x30+temp%100/10);
// Write_data_12864(0x30+temp%10000/1000);
// Write_data_12864(0x30+temp%100/10);
Write_data_12864(0x30+temp%10);
//printf("頻率:%f us\r\n",freq); //打印總的高點平時間
// freqdisplay=freq;
// addr_choose(4,0);
// Write_data_12864(0x30+freqdisplay/100000);
// Write_data_12864(0x30+freqdisplay%100000/10000);
// Write_data_12864(0x30+freqdisplay%10000/1000);
// Write_data_12864(0x2e);
// Write_data_12864(0x30+freqdisplay%1000/100);
// Write_data_12864(0x30+freqdisplay%100/10);
// Write_data_12864(0x30+freqdisplay%10);
freqdisplay=freq*1000;
addr_choose(4,0);
Write_data_12864(0x30+freqdisplay/100000000);
Write_data_12864(0x30+freqdisplay%100000000/10000000);
Write_data_12864(0x30+freqdisplay%10000000/1000000);
Write_data_12864(0x2e);
Write_data_12864(0x30+freqdisplay%1000000/100000);
Write_data_12864(0x30+freqdisplay%100000/10000);
Write_data_12864(0x30+freqdisplay%10000/1000);
Write_data_12864(0x30+freqdisplay%1000/100);
Write_data_12864(0x30+freqdisplay%100/10);
Write_data_12864(0x30+freqdisplay%10);
TIM3CH1_CAPTURE_STA=0; //開啟下一次捕獲
}
}
}
void MY_GPIO(void)
{
GPIO_InitTypeDef MY_GPIO;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);
MY_GPIO.GPIO_Pin=GPIO_Pin_1|GPIO_Pin_0;
MY_GPIO.GPIO_Mode=GPIO_Mode_Out_PP;
MY_GPIO.GPIO_Speed= GPIO_Speed_50MHz;
GPIO_Init(GPIOB,&MY_GPIO);
}
void TIM2_PWMconf(u16 arr,u16 psc)
{
GPIO_InitTypeDef mygpio;
TIM_TimeBaseInitTypeDef mytimebase;
TIM_OCInitTypeDef mytimeOC;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE); //使能定時器2時鐘
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE); //使能AFIO復用功能模塊時鐘
mygpio.GPIO_Mode=GPIO_Mode_AF_PP;//復用輸出
mygpio.GPIO_Pin=GPIO_Pin_1;//CH2
mygpio.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOA,&mygpio);
//初始化TIM2
mytimebase.TIM_CounterMode=TIM_CounterMode_Up;//向上計數
mytimebase.TIM_Period=arr;
mytimebase.TIM_Prescaler=psc;
mytimebase.TIM_ClockDivision=TIM_CKD_DIV1;
TIM_TimeBaseInit(TIM2,&mytimebase);
//初始化TIM2 Channel2 PWM模式
mytimeOC.TIM_OCMode=TIM_OCMode_PWM1;//pwm1 模式
mytimeOC.TIM_OCPolarity=TIM_OCPolarity_High;//輸出極性高
mytimeOC.TIM_OutputState=TIM_OutputState_Enable; //比較輸出使能
TIM_OC2Init(TIM2,&mytimeOC);// TIM2 OC2初始化
TIM_OC2PreloadConfig(TIM2, TIM_OCPreload_Enable); //使能TIM2在CCR2上的預裝載寄存器
TIM_Cmd(TIM2,ENABLE);//使能TIM2
TIM_SetCompare2(TIM2,450);//CCR2值
}
void TIM3_Cap_Init(u16 arr,u16 psc)
{
GPIO_InitTypeDef mygpio;
TIM_TimeBaseInitTypeDef mytimebase;
TIM_ICInitTypeDef myic;
NVIC_InitTypeDef mynvic;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //使能定時器3時鐘
mygpio.GPIO_Mode=GPIO_Mode_IPD; //設置成下拉輸入空閑時電平
mygpio.GPIO_Pin=GPIO_Pin_6;
GPIO_Init (GPIOA,&mygpio);
GPIO_ResetBits(GPIOA,GPIO_Pin_6);
//初始化定時器3 TIM3
mytimebase.TIM_Period=arr;
mytimebase.TIM_Prescaler=psc;
mytimebase.TIM_CounterMode=TIM_CounterMode_Up;
mytimebase.TIM_ClockDivision=TIM_CKD_DIV1;
TIM_TimeBaseInit(TIM3,&mytimebase);
//初始化TIM3 輸入捕獲參數
myic.TIM_Channel=TIM_Channel_1;
myic.TIM_ICPolarity=TIM_ICPolarity_Rising;
myic.TIM_ICSelection=TIM_ICSelection_DirectTI;
myic.TIM_ICPrescaler=TIM_ICPSC_DIV1;
myic.TIM_ICFilter=0x00;
TIM_ICInit(TIM3,&myic);
//中斷分組初始化
mynvic.NVIC_IRQChannel=TIM3_IRQn ;
mynvic.NVIC_IRQChannelPreemptionPriority=2;
mynvic.NVIC_IRQChannelSubPriority=0;
mynvic.NVIC_IRQChannelCmd=ENABLE;
NVIC_Init(&mynvic);
TIM_ITConfig(TIM3,TIM_IT_CC1|TIM_IT_Update,ENABLE);
TIM_Cmd(TIM3,ENABLE);
}
void TIM3_IRQHandler(void)
{
if((TIM3CH1_CAPTURE_STA&0X80)==0)//還未成功捕獲
{
if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET)
{
if(TIM3CH1_CAPTURE_STA&0X40)//已經捕獲到高電平了
{
if((TIM3CH1_CAPTURE_STA&0X3F)==0X3F)//高電平太長了
{
TIM3CH1_CAPTURE_STA|=0X80;//標記成功捕獲了一次
TIM3CH1_CAPTURE_VAL=0XFFFF;
}
else
TIM3CH1_CAPTURE_STA++;
}
}
if (TIM_GetITStatus(TIM3, TIM_IT_CC1) != RESET)//捕獲1發生捕獲事件
{
if(TIM3CH1_CAPTURE_STA&0X40) //捕獲到一個上升沿
{
TIM3CH1_CAPTURE_STA|=0X80; //標記成功捕獲到一次上升沿
TIM3CH1_CAPTURE_VAL=TIM_GetCounter(TIM3);
}
else //還未開始,第一次捕獲上升沿
{
TIM3CH1_CAPTURE_STA=0; //清空
TIM3CH1_CAPTURE_VAL=0;
TIM_SetCounter(TIM3,0);
TIM3CH1_CAPTURE_STA|=0X40; //標記捕獲到了上升沿
}
}
}
TIM_ClearITPendingBit(TIM3, TIM_IT_CC1|TIM_IT_Update); //清除中斷標志位
}

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