问答

请教一下各位，关于小华MCU，timerA的PWM输出，使用IO口为PC15，配置功能如下：但是目前从示博器来看输出波形一直保持不变，但是从打印来看，定时器是已经启动开始计数了。 void timer_init(uint16_t CompareValue) { /* MCU Peripheral registers write unprotected. */ LL_PERIPH_WE(LL_PERIPH_GPIO | LL_PERIPH_FCG | LL_PERIPH_PWC_CLK_RMU); stc_tmra_init_t stcTmraInit; stc_tmra_pwm_init_t stcPwmInit; /************************gpio config***************************/ stc_gpio_init_t stcGpioInit; (void)GPIO_StructInit(&stcGpioInit); stcGpioInit.u16PinDir = PIN_DIR_OUT; stcGpioInit.u16PinOutputType = PIN_OUT_TYPE_CMOS; //CMOS正常输出 (void)GPIO_Init(ENCODER_OUT_PORT, ENCODER_OUT_PIN, &stcGpioInit); /* 1. Enable TimerA peripheral clock. */ FCG_Fcg2PeriphClockCmd(FCG2_PERIPH_TMRA_4, ENABLE); /* 2. Set a default initialization value for stcTmraInit. */ (void)TMRA_StructInit(&stcTmraInit); /* 3. Modifies the initialization values depends on the application. */ stcTmraInit.sw_count.u16CountMode = TMRA_MD_SAWTOOTH; //锯齿波计数模式 stcTmraInit.sw_count.u16CountDir = TMRA_DIR_UP; //向上计数 stcTmraInit.u32PeriodValue = 10000U-1U; //自动重装载值 (void)TMRA_Init(CM_TMRA_4, &stcTmraInit); /* 4. Set the comparison reference value. */ (void)TMRA_PWM_StructInit(&stcPwmInit); stcPwmInit.u32CompareValue = 5000U-1; //20/40 50%占空比 GPIO_SetFunc(ENCODER_OUT_PORT, ENCODER_OUT_PIN, GPIO_FUNC_4); (void)TMRA_PWM_Init(CM_TMRA_4, TMRA_CH6, &stcPwmInit); TMRA_PWM_OutputCmd(CM_TMRA_4, TMRA_CH6, ENABLE); /*(void)TMRA_PWM_StructInit(&stcPwmInit); stcPwmInit.u32CompareValue = 20U-1; //20/40 50%占空比 GPIO_SetFunc(ENCODER_IN_PORT, ENCODER_IN_PIN, GPIO_FUNC_4); (void)TMRA_PWM_Init(CM_TMRA_4, TMRA_CH5, &stcPwmInit); TMRA_PWM_OutputCmd(CM_TMRA_4, TMRA_CH5, ENABLE);*/ /* MCU Peripheral registers write protected. */ LL_PERIPH_WP(LL_PERIPH_GPIO | LL_PERIPH_FCG | LL_PERIPH_PWC_CLK_RMU); /* Starts TimerA. */ TMRA_Start(CM_TMRA_4); }