SYSCTL_XTAL_6MHZ);
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOB); //使能PWM2和PWM3输出所在GPIO SysCtlPeripheralEnable(SYSCTL_PERIPH_PWM); //使能PWM模块 SysCtlPWMClockSet(SYSCTL_PWMDIV_1); //PWM时钟配置：不分频
GPIOPinTypePWM(GPIO_PORTB_BASE, (GPIO_PIN_0 | GPIO_PIN_1)); //PB0和PB1配置为PWM功能
PWMGenConfigure(PWM_BASE, PWM_GEN_1, //配置PWM发生器1：加减计数 PWM_GEN_MODE_UP_DOWN | PWM_GEN_MODE_NO_SYNC);
PWMGenPeriodSet(PWM_BASE, PWM_GEN_1, 6000); //设置PWM发生器1的周期 PWMPulseWidthSet(PWM_BASE, PWM_OUT_2, 4200); //设置PWM2输出的脉冲宽度 PWMPulseWidthSet(PWM_BASE, PWM_OUT_3, 2100); // 设置PWM3输出的脉冲宽度 PWMOutputState(PWM_BASE, (PWM_OUT_2_BIT | PWM_OUT_3_BIT), true); //使能PWM2和PWM3的输出
PWMGenEnable(PWM_BASE, PWM_GEN_1); // 使能PWM发生器1， 开始产生PWM方波 for (;;) { } }
