RT1051 PWM Capture Counter Stop

[coderick]

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 );
}

[Gavin_Jia · Accepted solution]

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