Issues interfacing I2S MP34DT05 with nRF52840

RE: Issues interfacing I2S MP34DT05 with nRF52840

Simon — Tue, 25 May 2021 17:24:48 GMT

Sorry, I didn't realize until now that MP34DT05 outputs PDM data.

You should use the API modules\hal\nordic\nrfx\drivers\include\nrfx_pdm.h to receive PDM data, not the API modules\hal\nordic\nrfx\drivers\include\nrfx_i2s.h.

By the way, it seems like you're getting good help here: https://devzone.nordicsemi.com/f/nordic-q-a/75483/nrfx-based-pdm-to-pcm-implementation-i2s-example. Should we close this ticket?

RE: Issues interfacing I2S MP34DT05 with nRF52840

Simon — Tue, 18 May 2021 16:07:29 GMT

[quote user="Nikhil D&K"]First of all the return error code from I2S init function gives me NRF_SUCCESS but than also it executes the if loop and print Init error.[/quote]

I guess you mean NRFX_SUCCESS? This doesn't make sense to me. If you get an NRFX_SUCCESS, the line printk("I2S init error: %d\n", err_code); should not get printed. Can you modify nrfx_i2s_init() like I showed in my first answer, then open Termite and run the code, and copy the result into this ticket.

[quote user="Nikhil D&K"]When i open the declaration for, NRF_SUCCESS, the whole file is in light gray color as its not enabled.[/quote]

I guess you mean NRFX_SUCCESS here as well? I'm not sure why it's gray, maybe there is something wrong with the IDE or something? If the define NRFX_SUCCESS is not found you should get an error during the preprocessor phase and you would not be able to build the code.

RE: Issues interfacing I2S MP34DT05 with nRF52840

Simon — Wed, 12 May 2021 13:06:47 GMT

I guess it fails here:

nrfx_err_t err_code = nrfx_i2s_init(&config, data_handler); //I assume this fails
if (err_code != NRFX_SUCCESS)
{
	printk("I2S init error\n");                              //and this gets printed
	return err_code;
}

Could you modify the code in the following manner, to check what error code nrfx_i2s_init() returns:

nrfx_err_t err_code = nrfx_i2s_init(&config, data_handler); 
if (err_code != NRFX_SUCCESS)
{
	printk("I2S init error: %d\n", err_code); //Modify this: Print error code
	return err_code;
}

Check whether the error code is NRFX_ERROR_INVALID_STATE or NRFX_ERROR_INVALID_PARAM. Then take a look at the nrfx_i2s_init() function description what the error means.

Best regards,

Simon