TI中文支持网下面是我写的程序，时间好像不对，请大佬们帮忙看看，我想测频率（方波+正弦）
main.c
#include "ALL.h"
#include "MY_timer.h"
char s[50];
extern double freq,temp;
int main(void)
{
ROM_FPULazyStackingEnable();
ROM_SysCtlClockSet( SYSCTL_SYSDIV_4 | SYSCTL_USE_PLL | SYSCTL_XTAL_16MHZ | SYSCTL_OSC_MAIN);
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOF);
ROM_GPIOPinTypeGPIOOutput(GPIO_PORTF_BASE, GPIO_PIN_1);
ROM_GPIOPinTypeGPIOOutput(GPIO_PORTF_BASE, GPIO_PIN_2);
ROM_GPIOPinTypeGPIOOutput(GPIO_PORTF_BASE, GPIO_PIN_3);
ConfigureUART_0(115200,1);
Uartx_printf(UART0_BASE,"Hello, world!\n");
TIMER0_init(0xffff);
while(1)
{
sprintf(s,"freq:%.4f\r\n",freq);
Uartx_printf(UART0_BASE,s);
delay_ms(40);
}
}
MY_timer.c
#include "ALL.h"
//GPTM
#include "timer.h"
#include "MY_timer.h"
#include <math.h>
double time,freq;
void TIMER0_interrupt(void)
{
u32 str;// u8 flag=0;
// u32 t[12],i=0; str=ROM_TimerIntStatus(WTIMER0_BASE,true);//屏蔽中断状态 if(str==TIMER_CAPA_EVENT)
{
GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_2, GPIO_PIN_2);
time=TimerValueGet(WTIMER0_BASE,TIMER_A) ;
freq=1000000.0/time;
// t[i]=ROM_TimerValueGet64(WTIMER0_BASE);
// i++;
// time=labs(t[1]-t[0]);
// if(i==2) i=0;
// flag++;
// if(flag==3) f=40000000.0/time;
}
ROM_TimerIntClear(WTIMER0_BASE, TIMER_CAPA_EVENT);}
void TIMER0_init(uint32_t freq)
{
uint32_t Load;
Load=SysCtlClockGet()/freq – 1;
if(Load<=0xffffffff)
{
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_WTIMER0);
ROM_TimerLoadSet(WTIMER0_BASE,TIMER_A,Load);
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOC); ROM_GPIOPinTypeGPIOInput(GPIO_PORTC_BASE, GPIO_PIN_4);
ROM_GPIOPinConfigure(GPIO_PC4_WT0CCP0); //#define GPIO_PC4_WT0CCP0 0x00021007
ROM_GPIOPinTypeTimer(GPIO_PORTC_BASE, GPIO_PIN_4);
ROM_TimerConfigure(WTIMER0_BASE,TIMER_CFG_A_CAP_TIME_UP|TIMER_CFG_SPLIT_PAIR);//计时捕获模式，上升沿捕获
ROM_TimerControlEvent(WTIMER0_BASE,TIMER_A,TIMER_EVENT_POS_EDGE);
ROM_TimerIntEnable(WTIMER0_BASE,TIMER_CAPA_EVENT); //定时器A捕获事件触发中断
IntRegister(INT_WTIMER0A ,TIMER0_interrupt);//注册中断函数
IntEnable(INT_WTIMER0A); //使能TIMER0A
IntMasterEnable(); //master interrupt enable API for all interrupts ROM_TimerEnable(WTIMER0_BASE, TIMER_A); //TIMER0A开始计数，当计数值等于TimerLoadSet，触发中断
}
}
Susan Yang：
请问您现在具体使用的是哪个型号呢？
user6024197：
回复 Susan Yang:
TM4C123GH6PMI
