| 想用TIMER0来测量高电平的持续时间，现在能读出TIMERA上升沿的定时器数值，却读不出来TIMERB下降沿定时器数值，，求大家帮帮我，，谢谢大家了 楼主程序 #include <stdint.h> #include <stdbool.h> #include "inc/tm4c123gh6pm.h" #include "inc/hw_memmap.h" #include "inc/hw_types.h" #include "driverlib/pin_map.h" #include "driverlib/sysctl.h" #include "driverlib/interrupt.h" #include "driverlib/gpio.h" #include "driverlib/timer.h" #define GPIO_PB6_T0CCP0 0x00011807 float time,time1; int main(void) { SysCtlClockSet(SYSCTL_SYSDIV_5|SYSCTL_USE_PLL|SYSCTL_XTAL_16MHZ|SYSCTL_OSC_MAIN); //5分频，使用PLL，外部晶振16M，system时钟源选择 main osc。系统时钟40MHZ SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER0); //使能TIMER0 32位(TIMER0A16位+TIMER0B16位) SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOF); // SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOB); //使能GPIOF和GPIOC外设 // GPIOPinTypeGPIOOutput(GPIO_PORTF_BASE, GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_3); GPIOPinTypeGPIOInput(GPIO_PORTB_BASE, GPIO_PIN_6); GPIOPinConfigure(GPIO_PB6_T0CCP0); //#define GPIO_PC4_WT0CCP0 0x00021007 GPIOPinTypeTimer(GPIO_PORTB_BASE, GPIO_PIN_6); TimerConfigure(TIMER0_BASE,TIMER_CFG_A_CAP_TIME_UP|TIMER_CFG_SPLIT_PAIR);//计时捕获模式，上升沿捕获 TimerConfigure(TIMER0_BASE,TIMER_CFG_B_CAP_TIME_UP|TIMER_CFG_SPLIT_PAIR); TimerControlEvent(TIMER0_BASE,TIMER_A,TIMER_EVENT_POS_EDGE); TimerControlEvent(TIMER0_BASE,TIMER_B,TIMER_EVENT_NEG_EDGE); IntEnable(INT_TIMER0A); IntEnable(INT_TIMER0B); //使能TIMER0A TimerIntEnable(TIMER0_BASE, TIMER_CAPA_EVENT); TimerIntEnable(TIMER0_BASE, TIMER_CAPB_EVENT); IntMasterEnable(); //master interrupt enable API for all interrupts TimerEnable(TIMER0_BASE, TIMER_BOTH); while(1) { } } void Timer0IntHandler(void) { TimerIntClear(TIMER0_BASE,TIMER_CAPA_EVENT); time=TimerValueGet(TIMER0_BASE,TIMER_A) ; } void Timer1IntHandler(void) { TimerIntClear(TIMER0_BASE,TIMER_CAPB_EVENT); time1=TimerValueGet(TIMER0_BASE,TIMER_B) ; } |
