TM4 timer

bing wu1

Prodigy 201 points

我用TM4的timer来测脉宽，发现用timerccp0可以准确测量，然后换成ccp1就发现不行了，求教ccp0和ccp1的区别

9 年多前

0 bing wu1 9 年多前

Prodigy 201 points

#include <stdbool.h>
#include "inc/hw_types.h"
#include "PulseWidth.h"

uint32_t Fre_TimerOutCount1=0;
uint32_t fre_temp_tick1=0;
int Fre_Frequece_Index1 = 0;
float Fre_Cur_Frequency1 = 0.000000;
float fre1[FREQUENCY_AVARAGE_NUM1] = { 0.0 };

uint32_t CapTimer_Fre_Ori1=0;

void Init_WTimer2_Pluse() {
// 启用WTIMER2模块
SysCtlPeripheralEnable (SYSCTL_PERIPH_WTIMER2);
SysCtlPeripheralEnable (SYSCTL_PERIPH_GPIOD);// 启用GPIO_M作为脉冲捕捉脚

GPIOPinConfigure (GPIO_PD0_WT2CCP0);
GPIOPinTypeTimer (GPIO_PORTD_BASE, GPIO_PIN_0);

//GPIOPadConfigSet (GPIO_PORTD_BASE, GPIO_PIN_0, GPIO_STRENGTH_2MA, GPIO_PIN_TYPE_STD_WPU);
TimerConfigure (WTIMER2_BASE, // 配置使用WTimer2的TimerA模块为边沿触发减计数模式
TIMER_CFG_SPLIT_PAIR | TIMER_CFG_A_CAP_TIME | TIMER_CFG_B_PERIODIC);
TimerControlEvent (WTIMER2_BASE, TIMER_BOTH, TIMER_EVENT_BOTH_EDGES);// 使用双边沿触发

TimerLoadSet (WTIMER2_BASE, TIMER_A, 0xFFFFFFFF);
TimerLoadSet (WTIMER2_BASE, TIMER_B, 0xFFFFFFFF);

TimerIntRegister(WTIMER2_BASE, TIMER_A, Int_WTimer2A_Handler);
TimerIntRegister(WTIMER2_BASE, TIMER_B, Int_WTimer2B_Handler);

IntMasterEnable ();
TimerIntEnable (WTIMER2_BASE, TIMER_CAPA_EVENT | TIMER_TIMB_TIMEOUT);
IntEnable (INT_WTIMER2A | INT_WTIMER2B);
TimerEnable (WTIMER2_BASE, TIMER_BOTH);
}

void Int_WTimer2A_Handler(void)
{
extern float Dis1;
uint32_t CapTimer_Fre1 = 0;
uint8_t flag1=1;
if(GPIOPinRead(GPIO_PORTD_BASE,GPIO_PIN_0))
{
if(flag1)
{
TimerIntClear (WTIMER2_BASE, TimerIntStatus (WTIMER2_BASE, false));
CapTimer_Fre1 = TimerValueGet(WTIMER2_BASE, TIMER_B);
CapTimer_Fre_Ori1 = CapTimer_Fre1;
Fre_TimerOutCount1 = 0;
}
else
{
TimerIntClear (WTIMER2_BASE, TimerIntStatus (WTIMER2_BASE, false));
CapTimer_Fre1 = TimerValueGet(WTIMER2_BASE, TIMER_B);
CapTimer_Fre_Ori1 = CapTimer_Fre1;
Fre_TimerOutCount1 = 0;
flag1=1;
}

}
else
{
if(flag1)
{
TimerIntClear (WTIMER2_BASE, TimerIntStatus (WTIMER2_BASE, false));
TimerEnable (WTIMER1_BASE, TIMER_A);
CapTimer_Fre1 = TimerValueGet(WTIMER2_BASE, TIMER_B);
if (Fre_TimerOutCount1 >= 1) fre_temp_tick1 = CapTimer_Fre_Ori1
+ ((Fre_TimerOutCount1 - 1) << 32 )+ (TIMER_TOTAL_COUNTNUM1 - CapTimer_Fre1);
else
fre_temp_tick1 = CapTimer_Fre_Ori1 - CapTimer_Fre1;

Dis1=340*fre_temp_tick1/1000000;
flag1=0;
}
else
{
TimerIntClear (WTIMER2_BASE, TimerIntStatus (WTIMER2_BASE, false));
}
}

}

void Int_WTimer2B_Handler(void)
{
TimerIntClear (WTIMER2_BASE,TimerIntStatus (WTIMER2_BASE, true));
TimerEnable (WTIMER2_BASE, TIMER_B);
Fre_TimerOutCount1++;
}

这个是32位ccp0代码可行，直接把寄存器和端口改了，ccp1就不行了