Use I2S play sound

RE: Use I2S play sound

john.liu — Tue, 31 Mar 2020 15:41:36 GMT

Thank you!

Question 1:

I have subcontracted transmit.But But it's all noise.

I setting :

MCKFREQ=I2S_CONFIG_MCKFREQ_MCKFREQ_32MDIV63

RATIO=I2S_CONFIG_RATIO_RATIO_32X

SWIDTH=I2S_CONFIG_SWIDTH_SWIDTH_16BIT

CHANNELS=I2S_CONFIG_CHANNELS_CHANNELS_LEFT

This sound file comes from https://github.com/NordicPlayground/nRF52-teensy-sgtl5000-audio/tree/master/Convert%20Audio%20Sample

Question 2:

I want setting EVENTS_TXPTRUPD interrupt.What should I do?I didn't find the interrupt interface.

Please help me analyze the source code.thank you.

devzone.nordicsemi.com/.../i2s.rar

RE: Use I2S play sound

Jørgen Holmefjord — Mon, 30 Mar 2020 16:04:43 GMT

You need to split up the data in multiple smaller buffers. The buffer pointers in the I2S peripheral is double-buffered, and you will receive events when the buffers are swapped. See Transmitting and receiving and EasyDMA for more details.

If you need to store the data in flash, you can copy it into the RAM buffer when you want to use it.

RE: Use I2S play sound

john.liu — Mon, 30 Mar 2020 14:47:14 GMT

Thank you!

I want to transmit 260760bytes,What shall I do?

RE: Use I2S play sound

Turbo J — Sat, 28 Mar 2020 21:36:08 GMT

Simple explanation:

int16_t sine_table[]= {} will be put into RAM.

const uint8_t output[260760] = {} will be put into FLASH.

EasyDMA does not support reading from FLASH, that is why the second example won't work properly.