LPC MicrocontrollersのトピックRe: LPC5536 PMW register update issue

LPC5536 PMW register update issue

jimmyli — Mon, 19 Jun 2023 05:36:47 GMT

Hi,

We are developing a project by LPC3336, a question shown below.

Hope you can help to check and fix.

1>LPC5536 PMW0 SM0 configuration

2>Question

"Immediate" can't take effect soon when set LDOK ( LDMOD is set to 1), we can't find the reason.

Thanks very much.

Re: LPC5536 PMW register update issue

Alice_Yang — Mon, 19 Jun 2023 09:01:31 GMT

Hello @jimmyli

1) Please check register SM0CTRL, whether set LDMOD to 1.

2)Test with SDK demo "PWM", default configuration is

/* Use full cycle reload */
pwmConfig.reloadLogic = kPWM_ReloadPwmFullCycle;

change it to " kPWM_ReloadImmediate", check whether "Immediate" take effect, also can compare the difference between two configurations.

Alice

Re: LPC5536 PMW register update issue

jimmyli — Mon, 19 Jun 2023 23:51:07 GMT

Hi Alice,

Thanks very much.

I will try again.

Re: LPC5536 PMW register update issue

明省徐 — Tue, 20 Jun 2023 09:16:50 GMT

Hi, Alice_Yang:

I Test with SDK demo "PWM", default configuration,change reloadLogic to kPWM_ReloadImmediate.

/* Use kPWM_ReloadImmediate reload */
pwmConfig.reloadLogic = kPWM_ReloadImmediate;

And check LDMOD is 1.

But when i change pwm duty, the duty is not change Immediate.

My test code is as follows:(pwm frequent is 10khz)

Config change:
pwmConfig.reloadLogic = kPWM_ReloadImmediate;
/* PWM A & PWM B form a complementary PWM pair */
pwmConfig.pairOperation = kPWM_ComplementaryPwmA;
pwmConfig.enableDebugMode = true;

infinite loop：

while (1U)
{
/* Delay at least 100 PWM periods. */
SDK_DelayAtLeastUs((1000000U / APP_DEFAULT_PWM_FREQUENCE) * 100, SDK_DEVICE_MAXIMUM_CPU_CLOCK_FREQUENCY);

Test_IO_Val_Set(1);

if(test_AC_duty == 100){
test_AC_duty = 0;
PWM_UpdatePwmDutycycle(BOARD_PWM_BASEADDR, kPWM_Module_0, kPWM_PwmA, kPWM_SignedCenterAligned, test_AC_duty);
PWM_SetPwmLdok(BOARD_PWM_BASEADDR, kPWM_Control_Module_0, true);
}
else{
test_AC_duty = 100;
PWM_UpdatePwmDutycycle(BOARD_PWM_BASEADDR, kPWM_Module_0, kPWM_PwmA, kPWM_SignedCenterAligned, test_AC_duty);
PWM_SetPwmLdok(BOARD_PWM_BASEADDR, kPWM_Control_Module_0, true);
}

Test_IO_Val_Set(0);

}

Re: LPC5536 PMW register update issue

jimmyli — Sun, 25 Jun 2023 05:42:08 GMT

Hi Alice,

Per replyed by xu mingsheng, I can't find another way to fix this problem.

Can you help to check again ?

This problem will impact the PWM out from LPC5536, and lead to the project be pending.

Thanks very much.

Re: LPC5536 PMW register update issue

Alice_Yang — Sun, 25 Jun 2023 09:06:09 GMT

Hello @明省徐

Could you please send the whole project, thanks.

Alice

Re: LPC5536 PMW register update issue

Alice_Yang — Sun, 25 Jun 2023 09:07:53 GMT

Hello @jimmyli

What about the result picture on your side? Is the same with 明省徐 ?

Alice

Re: LPC5536 PMW register update issue

明省徐 — Sun, 25 Jun 2023 10:29:03 GMT

Hi, Alice_Yang:

this is the project.

Re: LPC5536 PMW register update issue

Alice_Yang — Tue, 27 Jun 2023 06:17:51 GMT

Hello,

I tested on my side, when set

pwmConfig.reloadLogic = kPWM_ReloadImmediate;

The reload value can take effect immediately.

I used the project you send to me, and just change gpio on my side. Full speed run can not analysis it,

use breakpoint and step debug.

1) Set a breakpoint at

2) After run at here, click step over:

3)Click Run, check signal:

Yellow: GPIO

Green: PWM.

Also you can change "pwmConfig.reloadLogic " to other configurations, observe result.

Alice

Re: LPC5536 PMW register update issue

明省徐 — Tue, 27 Jun 2023 12:23:22 GMT

Hello,Alice_Yang：

I followed your steps, but the results were not as expected and were the same as the pictures I uploaded when I asked questions.

The mcu I tested is LPC5536, Can you share what your MCU is?

Re: LPC5536 PMW register update issue

明省徐 — Wed, 28 Jun 2023 09:22:03 GMT

Hi,Alice_Yang:

I test again in EVK board,but result is not except. result show in picture, Also use the project.