RT1051 PWM Capture Counter Stop

coderick — Fri, 31 Oct 2025 00:45:47 GMT

您好，最近在做关于RT1051的FlexPWM捕获项目时，遇到了计时器无法正常启动的问题，将分频代码去掉或者设为1分频时，Counter可以正常运行，但是设置2分频或更高的分频时Counter就停止了，这是什么原因？

void Capture_config(void) { pwm_input_capture_param_t pwm_input_capture; gpio_pin_config_t PWM_pin_config; //初始化输入捕获管脚 IOMUXC_SetPinMux(PWM2_PWMA03_IOMUXC, 0U); //设置外部引脚的复用功能 IOMUXC_SetPinConfig(PWM2_PWMA03_IOMUXC, PWMC_INPUT_PAD_CONFIG_DATA); //设置引脚的 pad 属性 PWM_pin_config.direction = kGPIO_DigitalInput; PWM_pin_config.interruptMode = kGPIO_NoIntmode; GPIO_PinInit(PWM2_PWMA03_GPIO, PWM2_PWMA03_GPIO_PIN, &PWM_pin_config); //初始化输入捕获配置参数 pwm_input_capture.captureInputSel = false; pwm_input_capture.edge0 = kPWM_RisingEdge; //pwm_input_capture.edge1 = kPWM_FallingEdge; pwm_input_capture.enableOneShotCapture = false; //pwm_input_capture.edgeCompareValue = 10; //当captureInputSel为FALSE时，此处设值无意义 pwm_input_capture.fifoWatermark = 0; PWM_SetupInputCapture(PI_PWM_BASEADDR, kPWM_Module_3, kPWM_PwmA, &pwm_input_capture); //开启捕获中断 //set_IRQn_Priority(PWM2_3_IRQn,Group4_PreemptPriority_0, Group4_SubPriority_0);//设置中断优先级 //PWM_EnableInterrupts(PI_PWM_BASEADDR, kPWM_Module_3, kPWM_CaptureA0InterruptEnable| kPWM_CaptureA1InterruptEnable ); PWM_EnableInterrupts(PI_PWM_BASEADDR, kPWM_Module_3, kPWM_CaptureA0InterruptEnable ); EnableIRQ(PWM2_3_IRQn); } /** * @brief 初始化 PWM 配置参数 * @retval 无 */ void PWM_config(void) { pwm_config_t pwmConfig;//定义pwm 配置结构体 PWM_Deinit(PI_PWM_BASEADDR, kPWM_Module_3); /*设置AHB总线时钟和IP总线时钟*/ CLOCK_SetDiv(kCLOCK_IpgDiv, 0x3); /* Set IPG PODF to 3, divede by 4 */ /*设置pwm 错误输入为高电平，表示没有错误，只有当pwm 没有错误输入或者禁止错误检测才能正常输出pwm波*/ XBARA_Init(XBARA1); XBARA_SetSignalsConnection(XBARA1, kXBARA1_InputLogicHigh, kXBARA1_OutputFlexpwm1Fault0); XBARA_SetSignalsConnection(XBARA1, kXBARA1_InputLogicHigh, kXBARA1_OutputFlexpwm1Fault1); XBARA_SetSignalsConnection(XBARA1, kXBARA1_InputLogicHigh, kXBARA1_OutputFlexpwm1234Fault2); XBARA_SetSignalsConnection(XBARA1, kXBARA1_InputLogicHigh, kXBARA1_OutputFlexpwm1234Fault3); PWM_GetDefaultConfig(&pwmConfig); pwmConfig.reloadLogic = kPWM_ReloadPwmFullCycle; //新值在上一个pwm周期输出结束之后加载到缓冲寄存器中 pwmConfig.pairOperation = kPWM_Independent; // 工作在独立模式 pwmConfig.clockSource = kPWM_BusClock; pwmConfig.enableDebugMode = true; // 使能DebugMode pwmConfig.prescale = kPWM_Prescale_Divide_128; //1320000000/128/65535=16Hz=PWM最小频率 //初始化 PWM 并且判断初始化是否成功 if (PWM_Init(PI_PWM_BASEADDR, kPWM_Module_3, &pwmConfig) == kStatus_Fail) { PRINTF("PWM initialization failed\n"); } Capture_config(); PWM_SetPwmLdok(PI_PWM_BASEADDR,kPWM_Control_Module_3 , true); PWM_StartTimer(PI_PWM_BASEADDR, kPWM_Control_Module_3 ); }

Re: RT1051 PWM Capture Counter Stop

Gavin_Jia — Mon, 03 Nov 2025 07:18:09 GMT

Hi @coderick ,

Thanks for your interest in NXP MIMXRT series!

Did you set BOARD_PWM_BASEADDR->SM[3].VAL1 & INIT in your project? If VAL1 is still 0, it will cause a problem.

Best regards,
Gavin

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RT1051 PWM Capture Counter Stop

Re: RT1051 PWM Capture Counter Stop