TM4C123G PF0管脚输出PWM问题

#include <stdbool.h>

#include <stdint.h>

#include "inc/hw_ints.h"

#include "inc/hw_memmap.h"

#include "driverlib/gpio.h"

#include "driverlib/interrupt.h"

#include "driverlib/pin_map.h"

#include "driverlib/pwm.h"

#include "driverlib/sysctl.h"

#include "driverlib/uart.h"

#include "utils/uartstdio.h"

//*****************************************************************************

//主程序

int

main(void)

{

    //

    // 设置系统时钟16M

   SysCtlClockSet(SYSCTL_SYSDIV_1 | SYSCTL_USE_OSC | SYSCTL_OSC_MAIN |

                   SYSCTL_XTAL_16MHZ);

    //

    // PWM不分频

    //

   SysCtlPWMClockSet(SYSCTL_PWMDIV_1);

    //使能M1PWM外设

   SysCtlPeripheralEnable(SYSCTL_PERIPH_PWM1);

    //使能M1PWM用到的PF，和RESET对应的PB

   SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOF);

   SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOB);//使能B端口，PB2、PB3分别对应RESET_AB,RESET_CD

   GPIOPinTypeGPIOOutput(GPIO_PORTB_BASE, GPIO_PIN_2|GPIO_PIN_3);//配置2,3管脚为输出

    //配置PF0，PF1分别为M1PWM4，M1PWM5

   GPIOPinConfigure(GPIO_PF0_M1PWM4);

   GPIOPinConfigure(GPIO_PF1_M1PWM5);

    // 配置PF0，PF1为PWM的输出管脚

   GPIOPinTypePWM(GPIO_PORTF_BASE, GPIO_PIN_0|GPIO_PIN_1);

    //

    // Configure the PWM1 to count down without synchronization.

    //配置GEN2递减计数模式不同步模式

   PWMGenConfigure(PWM1_BASE, PWM_GEN_2,

                    PWM_GEN_MODE_DOWN | PWM_GEN_MODE_NO_SYNC);

    //

    // Set the PWM period to 250Hz.  To calculate the appropriate parameter

    // use the following equation: N = (1 / f) * SysClk.  Where N is the

    // function parameter, f is the desired frequency, and SysClk is the

    // system clock frequency.

    // In this case you get: (1 / 250Hz) * 16MHz = 64000 cycles.  Note that

    // the maximum period you can set is 2^16.

    //设置PWM周期

   PWMGenPeriodSet(PWM1_BASE, PWM_GEN_2,100);

    //

    // For this example the PWM0 duty cycle will be variable.  The duty cycle

    // will start at 0.1% (0.01 * 64000 cycles = 640 cycles) and will increase

    // to 75% (0.5 * 64000 cycles = 32000 cycles).  After a duty cycle of 75%

    // is reached, it is reset to 0.1%.  This dynamic adjustment of the pulse

    // width is done in the PWM0 load interrupt, which increases the duty

    // cycle by 0.1% everytime the reload interrupt is received.

    //设置PWM占空比

   PWMPulseWidthSet(PWM1_BASE, PWM_OUT_4, 100/2);

   PWMPulseWidthSet(PWM1_BASE, PWM_OUT_5, 100/2);

    //使能PWM输出状态

   PWMOutputState(PWM1_BASE, PWM_OUT_4_BIT| PWM_OUT_5_BIT, true);

   GPIOPinWrite(GPIO_PORTB_BASE, GPIO_PIN_2, 0x1<<2);//H2管脚置高  对应RESETAB

   GPIOPinWrite(GPIO_PORTB_BASE, GPIO_PIN_3, 0x1<<3);//H3管脚置高 对应RESETCD

    //

    // 使能PWM发生器

   PWMGenEnable(PWM1_BASE, PWM_GEN_2);

    //循环等待响应

   while(1)

    {

    }

}

PF1能输出PWM，PF0不能输出PWM

zhetao xu：

回复 Ken Wang:

Hi Ken,

    谢谢你的答复。