AutoAnalogAudio Library - Updated with I2S support for nRF54L15 devices
Bringing audio to the nRF54L15
I was able to dabble little over the weekend, and ended up connecting an I2S amp and microphone to a nRF54L15 device. Getting it working was a little confusing at first, but the datasheet provided enough info to figure out the compatibility differences between nRF52840 and nRF54L15 devices. It was just a matter of making a few small changes.
One of the most glaring differences is with the main data pointer (NRF_I2S->RXTXD.MAXCNT). With the nRF52840 it counts by the number of 32-bit words, where the nRF54L15 counts individual bytes, so the main data handling functions needed to be modified.
The other glaring difference is the pin layouts, but I've used the same physical layout as the 52840. That is, the physical spots on the board are the same, but the underlying pin and port numbers have changed.
Per the AutoAnalogAudio library, these are how the pins are laid out by GPIO Pin / Port numbers:
I2S_PIN_MCK = 4;
I2S_PORT_MCK = 1;
I2S_PIN_SCK = 5;
I2S_PORT_SCK = 1;
I2S_PIN_LRCK = 7;
I2S_PORT_LRCK = 1;
I2S_PIN_SDOUT = 11;
I2S_PORT_SDOUT = 1;
I2S_PIN_SDIN = 10;
I2S_PORT_SDIN = 1;
The changes have been pushed to the master branch as of this writing, and I will clean up the code, possibly add support for the PWM and SAADC features, and do a release soon. For now users can clone from the master branch or install from ZIP.