Single endpoint for cyfxusbi2sdmamode

[LuTa_4642501]

Hi,

How I can reconfigure cyfxusbi2sdmamode.c to receive both left and right channels into endpoint 1 from the host?

A wave file in the host has LEFT_CHANNEL | RIGHT CHANNEL | LEFT_CHANNEL | RIGHT CHANNEL  | LEFT_CHANNEL | RIGHT CHANNEL ... layout, which is called interleaved data. How to send this to a single endpoint and DMA copies to the bus?

Where I can find more information about how this DMA-> I2S works?

- For the I2S bus, with 16 bits, 2 channels and 48000 sample rate I need to send 192000 bytes per second.

How the DMA handles data? It has a buffer of which size? What's the speed of data consumption?

Thanks

Lucas

[YashwantK_46 · Accepted solution]

Hello Lucas,

Please refer to section 8.8 Integrated Interchip Sound Interface of the FX3_TRM.pdf document available in the SDK path: C:\Program Files (x86)\Cypress\EZ-USB FX3 SDK\1.3\doc\firmware\FX3_TRM.pdf.

The above section mentions about the working of the I2S block of FX3 and all the respective conditions and interface definitions.

Also, on Page no. 194 of the above-mentioned document, mentions the following about MONO channel(highlighted in Yellow):

This means that both the endpoints need to be present and must have data for the hardware I2C transceiver to start working(highlighted in Blue).

Regards,
Yashwant