各位好,由于硬件设计将PWM接在WTIME4的PD4/PD5接口,按照配置普通TIMER的PWM模式测试,发现寄存器的值有变化,但是使用示波器不能检测到PWM波形,请各位指点。
//PWM #define PWM0_PORT_CLK SYSCTL_PERIPH_GPIOB #define PWM0_TIMER_PERIPH_CLK SYSCTL_PERIPH_TIMER2 #define PWM0_TIMER_BASE TIMER2_BASE #define PWM0_PORT_BASE GPIO_PORTB_BASE #define PWM0_PORT_PIN GPIO_PIN_0 #define PWM0_TIMER_CHL TIMER_A #define PWM0_TIMER_PIN GPIO_PB0_T2CCP0 #define PWM12_PORT_CLK SYSCTL_PERIPH_GPIOD #define PWM12_TIMER_PERIPH_CLK SYSCTL_PERIPH_WTIMER4 #define PWM12_TIMER_BASE WTIMER4_BASE #define PWM12_PORT_BASE GPIO_PORTD_BASE #define PWM1_PORT_PIN GPIO_PIN_4 #define PWM2_PORT_PIN GPIO_PIN_5 #define PWM1_TIMER_CHL TIMER_A #define PWM2_TIMER_CHL TIMER_B #define PWM1_TIMER_PIN GPIO_PD4_WT4CCP0 #define PWM2_TIMER_PIN GPIO_PD5_WT4CCP1 void TimerPWMInit(uint32_t prescale,uint32_t loadValue) { SysCtlPeripheralEnable(PWM0_PORT_CLK); SysCtlPeripheralEnable(PWM12_PORT_CLK); SysCtlPeripheralEnable(PWM0_TIMER_PERIPH_CLK); SysCtlPeripheralEnable(PWM12_TIMER_PERIPH_CLK); //开启时钟 TimerConfigure(PWM0_TIMER_BASE,TIMER_CFG_SPLIT_PAIR | TIMER_CFG_A_PWM); TimerConfigure(PWM12_TIMER_BASE,TIMER_CFG_SPLIT_PAIR | TIMER_CFG_A_PWM | TIMER_CFG_B_PWM); TimerClockSourceSet(PWM0_TIMER_BASE,TIMER_CLOCK_SYSTEM); TimerClockSourceSet(PWM12_TIMER_BASE,TIMER_CLOCK_SYSTEM); TimerControlLevel(PWM0_TIMER_BASE,TIMER_A,true); TimerControlLevel(PWM12_TIMER_BASE,TIMER_BOTH,true); TimerPrescaleSet(PWM0_TIMER_BASE,TIMER_A,prescale); TimerPrescaleSet(PWM12_TIMER_BASE,TIMER_BOTH,prescale); GPIOPinConfigure(PWM0_TIMER_PIN); GPIOPinConfigure(PWM1_TIMER_PIN); GPIOPinConfigure(PWM2_TIMER_PIN); GPIOPinTypeTimer(PWM0_PORT_BASE,PWM0_PORT_PIN); GPIOPinTypeTimer(PWM12_PORT_BASE,PWM1_PORT_PIN); GPIOPinTypeTimer(PWM12_PORT_BASE,PWM2_PORT_PIN); TimerLoadSet(PWM0_TIMER_BASE,TIMER_A,loadValue); TimerLoadSet(PWM12_TIMER_BASE,TIMER_BOTH,loadValue); TimerEnable(PWM0_TIMER_BASE,TIMER_A); TimerEnable(PWM12_TIMER_BASE,TIMER_BOTH); }