Default I2S output to different GPIO pins?

[colonelwatch]

When I was building usb_sound_card from the pico-playground repo, I had to define a different set of GPIO pins in the CMakeLists.txt file because GP25 was not exposed on the Raspberry Pi Pico.

pico-extras/src/rp2_common/pico_audio_i2s/include/pico/audio_i2s.h

Lines 99 to 107 in f5c7be9

	#ifndef PICO_AUDIO_I2S_DATA_PIN
	//#warning PICO_AUDIO_I2S_DATA_PIN should be defined when using AUDIO_I2S
	#define PICO_AUDIO_I2S_DATA_PIN 27
	#endif
	#ifndef PICO_AUDIO_I2S_CLOCK_PIN_BASE
	//#warning PICO_AUDIO_I2S_CLOCK_PIN_BASE should be defined when using AUDIO_I2S
	#define PICO_AUDIO_I2S_CLOCK_PIN_BASE 25
	#endif

So, a default PICO_AUDIO_I2S_CLOCK_PIN_BASE of 25 doesn't sound great. Shouldn't this be a different pin? In my case, I set PICO_AUDIO_I2S_CLOCK_PIN_BASE to 26 and PICO_AUDIO_I2S_DATA_PIN to 28. This leaves the WS signal, which then is 27 because that is PICO_AUDIO_I2S_CLOCK_PIN_BASE+1. All of these pins are exposed on the Pico.

[kilograham]

fixed