topic Re: Suspended on enable clock for InputMux. in LPC Microcontrollers

Suspended on enable clock for InputMux.

CzyzyK — Wed, 09 Oct 2024 19:20:36 GMT

Hello.

I use LPC55s36 with unmodified i2s_dma_transfer example. From default pins i shorted JP3 1-2, JP53 1-2 and JP50 1-2, like the example says to do. Terminal says that it went throught all of the code and, theres no errors in terminal. Terminal:

Configure codec

Configure I2S

Setup looping playback of sine wave

But i can't hear anything in headphones. What could be the issue?

Re: Suspended on enable clock for InputMux.

Harry_Zhang — Fri, 11 Oct 2024 06:53:08 GMT

Hi @CzyzyK

You can observe the output effect through an oscilloscope.

According to the schematic, you can measure these three signals.

The above is the result of my test, you can refer to it.

Hang

Re: Suspended on enable clock for InputMux.

CzyzyK — Fri, 11 Oct 2024 20:47:58 GMT

@Harry_Zhang I checked it, there is no signal coming to jack.
I also tried flashing instead of debugging and still nothing.

Re: Suspended on enable clock for InputMux.

Harry_Zhang — Mon, 14 Oct 2024 03:16:58 GMT

Hi @CzyzyK

I checked the lpc55s36_i2s_dma_transfer demo readme.

Board settings
==============
Short JP50 1-2,JP53 1-2

But in your setting,

"From default pins i shorted JP3 1-2, JP53 1-2 and JP50 1-2, like the example says to do. "

Why shorted JP3 1-2?

Hang

Re: Suspended on enable clock for InputMux.

CzyzyK — Mon, 14 Oct 2024 16:38:12 GMT

Hi @Harry_Zhang , the description says to do so in import SKD examples. Removing shorting on JP3 1-2 didn't change anything.

Re: Suspended on enable clock for InputMux.

Harry_Zhang — Thu, 17 Oct 2024 03:12:38 GMT

Hi @CzyzyK

Thanks for your picture.

May I ask if you can measure the waveform?

Hang

Re: Suspended on enable clock for InputMux.

CzyzyK — Sun, 20 Oct 2024 15:50:49 GMT

Hi @Harry_Zhang , how i can measure those signals, i didn't find anything in manual.

Re: Suspended on enable clock for InputMux.

Harry_Zhang — Mon, 21 Oct 2024 07:06:57 GMT

Hi @CzyzyK

1. For CDC_I2S1_RX_BCLK_OnBoard signal, you can measure the J9 Pin16.

2. For CDC_FC7_I2S_TX_OnBoard signal, you can measure the J22 Pin2.

3. For CDC_I2S_WS_OnBoard signal, you can measure the J22 Pin4.

Hang

Re: Suspended on enable clock for InputMux.

CzyzyK — Tue, 22 Oct 2024 15:38:57 GMT

Hi @Harry_Zhang , I2S and RX is fine i think, but TX is diffrent.

I2S:

RX:

TX:

Re: Suspended on enable clock for InputMux.

Harry_Zhang — Mon, 28 Oct 2024 02:05:54 GMT

Hi @CzyzyK

RX_BCLK and TX are fine.

Regarding the WS signal, may I ask if you are testing J22 Pin4?

Hang

Re: Suspended on enable clock for InputMux.

CzyzyK — Mon, 28 Oct 2024 19:15:49 GMT

Hi, @Harry_Zhang I checked this ones TXD on pin 4, with is near RX pin.

Re: Suspended on enable clock for InputMux.

Harry_Zhang — Wed, 30 Oct 2024 10:17:00 GMT

Hi @CzyzyK

The pin measured is correct.

Hang

Re: Suspended on enable clock for InputMux.

CzyzyK — Wed, 30 Oct 2024 16:36:24 GMT

Hi @Harry_Zhang
So what could be wrong?

Re: Suspended on enable clock for InputMux.

Harry_Zhang — Thu, 31 Oct 2024 10:03:06 GMT

Hi @CzyzyK

BH19 should be connected to BH20, but the board defaults to BH20 and BH21. You can try testing point BH20 to see the waveform.

Hang