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急求！ TM4C123G6HPM PWM 脉宽输出中PC5引脚的问题。参照库中的接口，程序如下：

hong she
Prodigy 30 points

int main()

{

SysCtlClockSet(SYSCTL_SYSDIV_1 | SYSCTL_USE_OSC | SYSCTL_OSC_MAIN |
SYSCTL_XTAL_16MHZ);

SysCtlPWMClockSet(SYSCTL_PWMDIV_1);
SysCtlPeripheralEnable(SYSCTL_PERIPH_PWM0);
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOC);


GPIOPinConfigure(GPIO_PC5_M0PWM7);

GPIOPinTypePWM(GPIO_PORTC_BASE, GPIO_PIN_5);


PWMGenConfigure(PWM0_BASE, PWM_GEN_3, PWM_GEN_MODE_DOWN |
PWM_GEN_MODE_NO_SYNC);

PWMGenPeriodSet(PWM0_BASE, PWM_GEN_3, 100);
PWMPulseWidthSet(PWM0_BASE, PWM_OUT_3, 25);

PWMOutputState(PWM0_BASE, PWM_OUT_7_BIT, true);
PWMGenEnable(PWM0_BASE, PWM_GEN_3);

while(1)
{
}

}

程序运行后用示波器量相应的引脚，却没有想要的方波出现啊？求大神帮忙看看，什么原因。