Problems Setting Prescaler for PWM capture We are using a PWM input to capture a external frequency of a tacho. With the standard settings everything works fine but when i apply a prescaler during initialization pwmConfig.prescale = kPWM_Prescale_Divide_64; or by setting it via void PWM_SetClockMode the values of CVAL2 and CVAL3 are always 0x00 and the counter is not counting My signal has a frequency of 200Hz Re: Problems Setting Prescaler for PWM capture Hello, I've encountered the same issue, when configuring the any of the four PWM peripherals clock perscaler with values other than kPWM_Prescale_Divide_1 , the counter of the selected PWM peripheral doesn't work at all. I'm using the imxrt1062 processor and MCUXpresso IDE v11.9.1 I hope, you can support me as soon as possible. And, here is a snippet of my code where I configure and initialize the pwm peripherals. static void pwm_init(void) { pwm_config_t pwmConfig; pwm_input_capture_param_t captureConfig; pwm_fault_param_t faultConfig; /* Read the PWM default configuration */ PWM_GetDefaultConfig(&pwmConfig); pwmConfig.clockSource = kPWM_BusClock; pwmConfig.prescale = kPWM_Prescale_Divide_2; pwmConfig.pairOperation = kPWM_Independent; pwmConfig.initializationControl = kPWM_Initialize_LocalSync; pwmConfig.reloadLogic = kPWM_ReloadImmediate; pwmConfig.reloadSelect = kPWM_LocalReload; pwmConfig.reloadFrequency = kPWM_LoadEveryOportunity; pwmConfig.forceTrigger = kPWM_Force_LocalSync; pwmConfig.enableDebugMode = true; PWM_Init(PWM1_BASEADDR, kPWM_Module_3, &pwmConfig); PWM_Init(PWM2_BASEADDR, kPWM_Module_3, &pwmConfig); PWM_Init(PWM3_BASEADDR, kPWM_Module_1, &pwmConfig); PWM_Init(PWM4_BASEADDR, kPWM_Module_1, &pwmConfig); // fault configuration PWM_FaultDefaultConfig(&faultConfig); /* Sets up the PWM fault protection */ PWM_SetupFaults(PWM1_BASEADDR, kPWM_Fault_0, &faultConfig); PWM_SetupFaults(PWM1_BASEADDR, kPWM_Fault_1, &faultConfig); PWM_SetupFaults(PWM1_BASEADDR, kPWM_Fault_2, &faultConfig); PWM_SetupFaults(PWM1_BASEADDR, kPWM_Fault_3, &faultConfig); /* Set PWM fault disable mapping for submodule 0/1/2 */ PWM_SetupFaultDisableMap(PWM1_BASEADDR, kPWM_Module_0, kPWM_PwmA, kPWM_faultchannel_0, kPWM_FaultDisable_0 | kPWM_FaultDisable_1 | kPWM_FaultDisable_2 | kPWM_FaultDisable_3); PWM_SetupFaultDisableMap(PWM1_BASEADDR, kPWM_Module_1, kPWM_PwmA, kPWM_faultchannel_0, kPWM_FaultDisable_0 | kPWM_FaultDisable_1 | kPWM_FaultDisable_2 | kPWM_FaultDisable_3); PWM_SetupFaultDisableMap(PWM1_BASEADDR, kPWM_Module_2, kPWM_PwmA, kPWM_faultchannel_0, kPWM_FaultDisable_0 | kPWM_FaultDisable_1 | kPWM_FaultDisable_2 | kPWM_FaultDisable_3); PWM_SetupFaultDisableMap(PWM1_BASEADDR, kPWM_Module_3, kPWM_PwmA, kPWM_faultchannel_0, kPWM_FaultDisable_0 | kPWM_FaultDisable_1 | kPWM_FaultDisable_2 | kPWM_FaultDisable_3); /* Sets up the PWM fault protection */ PWM_SetupFaults(PWM2_BASEADDR, kPWM_Fault_0, &faultConfig); PWM_SetupFaults(PWM2_BASEADDR, kPWM_Fault_1, &faultConfig); PWM_SetupFaults(PWM2_BASEADDR, kPWM_Fault_2, &faultConfig); PWM_SetupFaults(PWM2_BASEADDR, kPWM_Fault_3, &faultConfig); /* Set PWM fault disable mapping for submodule 0/1/2 */ PWM_SetupFaultDisableMap(PWM2_BASEADDR, kPWM_Module_0, kPWM_PwmA, kPWM_faultchannel_0, kPWM_FaultDisable_0 | kPWM_FaultDisable_1 | kPWM_FaultDisable_2 | kPWM_FaultDisable_3); PWM_SetupFaultDisableMap(PWM2_BASEADDR, kPWM_Module_1, kPWM_PwmA, kPWM_faultchannel_0, kPWM_FaultDisable_0 | kPWM_FaultDisable_1 | kPWM_FaultDisable_2 | kPWM_FaultDisable_3); PWM_SetupFaultDisableMap(PWM2_BASEADDR, kPWM_Module_2, kPWM_PwmA, kPWM_faultchannel_0, kPWM_FaultDisable_0 | kPWM_FaultDisable_1 | kPWM_FaultDisable_2 | kPWM_FaultDisable_3); PWM_SetupFaultDisableMap(PWM2_BASEADDR, kPWM_Module_3, kPWM_PwmA, kPWM_faultchannel_0, kPWM_FaultDisable_0 | kPWM_FaultDisable_1 | kPWM_FaultDisable_2 | kPWM_FaultDisable_3); /* Sets up the PWM fault protection */ PWM_SetupFaults(PWM3_BASEADDR, kPWM_Fault_0, &faultConfig); PWM_SetupFaults(PWM3_BASEADDR, kPWM_Fault_1, &faultConfig); PWM_SetupFaults(PWM3_BASEADDR, kPWM_Fault_2, &faultConfig); PWM_SetupFaults(PWM3_BASEADDR, kPWM_Fault_3, &faultConfig); /* Set PWM fault disable mapping for submodule 0/1/2 */ PWM_SetupFaultDisableMap(PWM3_BASEADDR, kPWM_Module_0, kPWM_PwmA, kPWM_faultchannel_0, kPWM_FaultDisable_0 | kPWM_FaultDisable_1 | kPWM_FaultDisable_2 | kPWM_FaultDisable_3); PWM_SetupFaultDisableMap(PWM3_BASEADDR, kPWM_Module_1, kPWM_PwmA, kPWM_faultchannel_0, kPWM_FaultDisable_0 | kPWM_FaultDisable_1 | kPWM_FaultDisable_2 | kPWM_FaultDisable_3); PWM_SetupFaultDisableMap(PWM3_BASEADDR, kPWM_Module_2, kPWM_PwmA, kPWM_faultchannel_0, kPWM_FaultDisable_0 | kPWM_FaultDisable_1 | kPWM_FaultDisable_2 | kPWM_FaultDisable_3); PWM_SetupFaultDisableMap(PWM3_BASEADDR, kPWM_Module_3, kPWM_PwmA, kPWM_faultchannel_0, kPWM_FaultDisable_0 | kPWM_FaultDisable_1 | kPWM_FaultDisable_2 | kPWM_FaultDisable_3); /* Sets up the PWM fault protection */ PWM_SetupFaults(PWM4_BASEADDR, kPWM_Fault_0, &faultConfig); PWM_SetupFaults(PWM4_BASEADDR, kPWM_Fault_1, &faultConfig); PWM_SetupFaults(PWM4_BASEADDR, kPWM_Fault_2, &faultConfig); PWM_SetupFaults(PWM4_BASEADDR, kPWM_Fault_3, &faultConfig); /* Set PWM fault disable mapping for submodule 0/1/2 */ PWM_SetupFaultDisableMap(PWM4_BASEADDR, kPWM_Module_0, kPWM_PwmA, kPWM_faultchannel_0, kPWM_FaultDisable_0 | kPWM_FaultDisable_1 | kPWM_FaultDisable_2 | kPWM_FaultDisable_3); PWM_SetupFaultDisableMap(PWM4_BASEADDR, kPWM_Module_1, kPWM_PwmA, kPWM_faultchannel_0, kPWM_FaultDisable_0 | kPWM_FaultDisable_1 | kPWM_FaultDisable_2 | kPWM_FaultDisable_3); PWM_SetupFaultDisableMap(PWM4_BASEADDR, kPWM_Module_2, kPWM_PwmA, kPWM_faultchannel_0, kPWM_FaultDisable_0 | kPWM_FaultDisable_1 | kPWM_FaultDisable_2 | kPWM_FaultDisable_3); PWM_SetupFaultDisableMap(PWM4_BASEADDR, kPWM_Module_3, kPWM_PwmA, kPWM_faultchannel_0, kPWM_FaultDisable_0 | kPWM_FaultDisable_1 | kPWM_FaultDisable_2 | kPWM_FaultDisable_3); /* Configure the capture input of the PWM for one shot polling */ captureConfig.captureInputSel = true; captureConfig.edge0 = kPWM_RiseAndFallEdge; captureConfig.edge1 = kPWM_Disable; captureConfig.enableOneShotCapture = false; captureConfig.edgeCompareValue = 1; PWM_SetupInputCapture(PWM1_BASEADDR, kPWM_Module_3, kPWM_PwmA, &captureConfig); PWM_SetupInputCapture(PWM2_BASEADDR, kPWM_Module_3, kPWM_PwmA, &captureConfig); PWM_SetupInputCapture(PWM3_BASEADDR, kPWM_Module_1, kPWM_PwmA, &captureConfig); PWM_SetupInputCapture(PWM4_BASEADDR, kPWM_Module_1, kPWM_PwmA, &captureConfig); PWM_SetPwmLdok(PWM1_BASEADDR, kPWM_Control_Module_3, true); PWM_SetPwmLdok(PWM2_BASEADDR, kPWM_Control_Module_3, true); PWM_SetPwmLdok(PWM3_BASEADDR, kPWM_Control_Module_1, true); PWM_SetPwmLdok(PWM4_BASEADDR, kPWM_Control_Module_1, true); PWM_StartTimer(PWM1_BASEADDR, kPWM_Control_Module_3); PWM_StartTimer(PWM2_BASEADDR, kPWM_Control_Module_3); PWM_StartTimer(PWM3_BASEADDR, kPWM_Control_Module_1); PWM_StartTimer(PWM4_BASEADDR, kPWM_Control_Module_1); } Problems Setting the Prescaler for PWM capture Hi, I have the same problem as the owner, when I remove the crossover code or set it to 1 crossover frequency, the Counter works fine, but when I set it to 2 crossover frequency or higher the Counter stops, what is the reason for this? 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: Problems Setting Prescaler for PWM capture Hello @mexp2,
First of all, we apologize for the delay to answer you.
Just for double check, could you please tell us where are you placing the kPWM_Prescale_Divide_128? It might be good if you could write the pwmConfig.prescale=kPWM_Prescale_Divide_128; after pwmConfig.pairOperation=kPWM_Independent; and before PWM_Init(). Also, which clock source are you using?
Finally, could you please try to use other values of the prescaler below 64?
Best regards, Raul. Re: Problems Setting Prescaler for PWM capture We use the imxRT1062 with the SDK v 2.13.0 /* Read the PWM default configuration */
PWM_GetDefaultConfig(&pwmConfig);
pwmConfig.reloadLogic = kPWM_ReloadImmediate;
pwmConfig.pairOperation = kPWM_Independent;
pwmConfig.enableDebugMode = true;
/* Init the pwm */
if( PWM_Init(TACHOPUMP_PERIPHERAL, TACHOPUMP_CHANNEL, &pwmConfig) == kStatus_Fail)
{
PRINTF("Can't initialize PWM\n");
return;
}
/* Configure the capture input of the PWM for one shot polling */
pwm_input_capture_param_t captureConfig;
captureConfig.captureInputSel = false;
captureConfig.edge0 = kPWM_RisingEdge;
captureConfig.edge1 = kPWM_RisingEdge;
captureConfig.enableOneShotCapture = true;
PWM_SetupInputCapture(TACHOPUMP_PERIPHERAL, TACHOPUMP_CHANNEL, TACHOPUMP_SIGNAL, &captureConfig);
PWM_SetPwmLdok(TACHOPUMP_PERIPHERAL, timerBitmask, true);
PWM_StartTimer(TACHOPUMP_PERIPHERAL, timerBitmask); with this code everything works as expected, but if i add a prescaler in the configuration pwmConfig.prescale = kPWM_Prescale_Divide_128; the counter is not counting anymore Re: Problems Setting Prescaler for PWM capture Hi @mexp2 ,
I hope you are doing well.
Please specify which i.MX Processor is used to debug further.
Thanks & Regards, Sanket Parekh
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