nRF52 with WM8960 CODEC

[Sunil vignesh]

Hi,

I am trying to interface WM8960 CODEC with nRF52832 using (I2S and I2C) .

Problem I am having is with TWI scanner  and also sending data to the know i2c address . have error code of 1

but as same board . testing with Arduino uno and STM32 boards . the twi scanning gives me result 0x1a (7 bit address)

i am not know why nRF doesn't read the CODEC module address

[Jørgen Holmefjord]

Hi,

Have you checked the connections to the I2C device is correct, and that it is powered correctly? Which GPIOs are you using for SCL/SDA?

What is the supply voltage of the I2C device? Arduino uno and STM32 may support 5V level when interfacing I2C devices, but nRF52832 may not support this when running at 3V supply or lower.

Can you provide a logic trace of the TWI bus?

Best regards,
Jørgen

[Sunil vignesh]

Anything i have missed Jørgen

[Jørgen Holmefjord]

I'm not sure why you added a shift in the address, but if I revert your code back to "err_code = nrf_drv_twi_rx(&m_twi, address, &sample_data, sizeof(sample_data))", I'm able to correctly detect another I2C sensor.

If you are not able to detect your sensor with this code, there is either something wrong with the sensor/connections/logic levels/etc, or in your project configuration.

[Sunil vignesh]

Yes, Usually I tried without shift address but no response in the twi line

i have checked with reference of STM code where the same codec board gets scanned and also able to bring up the codec module.

I can say that CODEC board works perfect . we can check the logic trace

what about project configuration . i am using the default TWI SCANNER project configuration

[Sunil vignesh]

Hi,

I have checked with the logic analyzer i got result like this

I hope you will have the software

https://www.saleae.com/downloads/

Session 0.zip

[Jørgen Holmefjord]

I looked at the logic trace, and it seems to correctly setup a read on address 0x1A, which should be the address of the WM8960. However, there is no ACK from the slave, which is why you can't detect it from the code.

If you are sure that this is the correct address, you may want to remove the other addresses, and check only this address with a scope, to look at the voltage levels, etc. You may also want to compare the scope image from the nRF with scope images from the working communication on the Arduino/STM32.

[Sunil vignesh]

Hi Jørgen,

I have tested and in twi scanner it is not responding. and If i tried to write the data with the given format the i2c line works.

Have you work with this WM8960 CODEC module

I am trying to connect I2S line to tap audio from MIC and transmit to speaker.

Previously i worked with I2S for NEOPIXEL where i have connect only the SDIN pin

But here i found

WS,I2S_CLK, SDIN, SDOUT

in WM8960 i found WS,CLK, TXSDA, RXSDA.

I am confusing with pin connection to tap audio signal and also i need to generate audio to the speaker so. as like NEOPIXEL i just need to connect only SDIN to the TXSDA ?

[Jørgen Holmefjord]

I have not worked with WM8960 before, so I can't comment on how to use this apart from interfacing from the nRF52. You should contact the manufacturer of the device regarding how to use it.

If it supports both recording audio from mic and playing audio on speaker, you need to connect both SDIN and SDOUT pins.

I2S is not intended for use with NEOPIXEL, it is just possible to make the I2S peripheral output signals that can control the NEOPIXEL by connecting the SDOUT pin. When using I2S for audio, WS (LRCK), CLK, and SD pin is required.

[Sunil vignesh]

Hi Jørgen,

Thank you for the reply. I understand that. I have some other query related to nrf i2s protocol and their transmission with easy DMA . also created new query here

possible can you give me the example for I2s audio play back example or link

[Jørgen Holmefjord]

Hi,

You can find the I2S Loopback Example. To use it for sending audio to speaker, simply replace the data with the audio data, remove the rx buffer (.p_rx_buffer = NULL) and remove the check of received data.

Best regards,
Jørgen

[Sunil vignesh]

Is there a limit for the buffer

Is it possible to send array[50000];

because i am having the wave data file that is 4,00,000 of data in array

if i want to split and send max limit for i2s send is 65535 isn't it.

[Jørgen Holmefjord]

The I2S peripheral in nRF52832/833/840 have a MAXCNT register width of 14-bits, which means you can send up to 16383 32-bit words in one transfer.