Need I2S help

[damo76]

Hi there,

I'm just trying to start to code my project. I want to stream 48k 16 bit audio from one nrf52840 dongle to the other one. I only need one way transfer.

I have looked at every example I could find but still dont seem to get how to send the packets to the radio and over the wireless connection.

Is there anyone that can help get me started with some simple no frills code.

I'm using Segger and sdk v17.

I would be most grateful if someone could assist me here.  Once I get the streaming part working successfully I think I can work out how to do the other things I need but this I2S is very tricky it seems to know what to do. It needs to be a steady stream.

Kind regards,

Dam076

[ovrebekk]

Hi

The driver allows you to set one of the buffers to NULL in case you only need one directional data flow. 

If you look at the start of the nrfx_i2s_start(..) function you can see that is checks to make sure one of these buffers is set, otherwise it will trigger an error. Having both set is not a requirement:

nrfx_err_t nrfx_i2s_start(nrfx_i2s_buffers_t const * p_initial_buffers,
                          uint16_t                   buffer_size,
                          uint8_t                    flags)
{
    NRFX_ASSERT(p_initial_buffers != NULL);
    NRFX_ASSERT(p_initial_buffers->p_rx_buffer != NULL ||
                p_initial_buffers->p_tx_buffer != NULL);
    .
    .

Once you  have this running let me know, and I will do my best to guide you in integrating the rest. 

Best regards
Torbjørn

[damo76]

I did it using circular buffers. Happy to help anyone if they need assistance. The code is complicated. cheers

[ovrebekk]

Good to hear you got it working