Generating PWM in 1 HZ frequency

[AJ369]

I referred sdk pwm example and I created a PWM1 using submodule 0 with channel B. My clock is IPG(150 MHZ) prescaled by 128 so clock equal to 1.1MHZ. I want to create 1 hz(1 sec ) PWM.

I got only 128 HZ maximum with my configuration. Kindly help me to solve this issue.

Configuration added below:-

Peripheral.c

pwm_config_t PWM1_SM0_config = {
.clockSource = kPWM_BusClock,
.prescale = kPWM_Prescale_Divide_128,
.pairOperation = kPWM_Independent,
.initializationControl = kPWM_Initialize_LocalSync,
.reloadLogic = kPWM_ReloadImmediate,
.reloadSelect = kPWM_LocalReload,
.reloadFrequency = kPWM_LoadEveryOportunity,
.forceTrigger = kPWM_Force_Local,
.enableDebugMode = false,
.enableWait = false
};

peripheral.h

#define PWM1_SM0_COUNTER_CLK_SOURCE_FREQ_HZ 1171875U
/* Definition of submodule 0 counter (PWM) frequency in Hertz */
#define PWM1_SM0_COUNTER_FREQ_HZ 1000U

Setting pwm:-

PWM_SetupPwm(peripheral, subModule, chnlParams, numOfChnls, mode, 1UL,
1171875U);

Need some support on this.

Thanks!

[_Leo_]

Hi Alan, 

What you can do is reduce the IPG_CLK_ROOT to 200 kHz and using a prescale of 4, with that you can get the frequency of 1 Hz in your PWM.

[AJ369]

Hi,

Sorry for the late reply. I tried based on your screen shot  but I faced some issue in clock settings.

can you pls help me on this.

When I try to make 600KHz AHB and 200KHZ IPG its showing some error.

I need one more details is it possible to configure pwm frequency to 0.5Hz

PWM_SetupPwm(PWM_Type *base,
pwm_submodule_t subModule,
const pwm_signal_param_t *chnlParams,
uint8_t numOfChnls,
pwm_mode_t mode,
uint32_t pwmFreq_Hz,
uint32_t srcClock_Hz);

Please support me on this.

Thanks!