Raspberry Pi Forums

I know the Pi has an analog audio out. But is there an analog audio input option that isn't USB based?

I would like to get the lowest possible latency for a project that does realtime audio processing for a guitar processor.

John Anderson

I think this is going to be a big fat no, but I'll let someone more expert in the hardware side of things answer this.
Something might be possible over GPIO.

Yeah, if necessary to build your own audio I/O hooked to the GPIO I'd still need to come up with some driver software.

There is the P5 connector on the new board revision: see
http://www.raspberrypi.org/archives/1929

" Additional I/O Expansion

To utilise GPIO signals released by the removal of the version identification links, a new connector site P5 has been added. This carries the four GPIO signals [BCM2835/GPIO28 – BCM2835/GPIO31] named GPIO7 – GPIO10 respectively, along with +5V0, +3V3 and two 0V. Currently this connector is not populated.

This GPIO allocation provides access to one of:
* SDA0, SCL0 (Operating independently of P1 SDA1, SCL1); or
* PCM_CLK, PCM_FS, PCM_DIN, PCM_DOUT or I2S; or
* Four GPIO signals.

This connector is intended to be a suitable attachment point for third-party clock and audio codec boards,..... "

I too need audio input for a project, but haven't seen any expansion for P5 yet...

Thanks Paulie. Being a software guy I was hoping there was already an attachment available for this. Might have to beg some help from a hardware buddy.

John

fly135 wrote:I would like to get the lowest possible latency for a project that does realtime audio processing for a guitar processor.

What are you thinking of using software-wise?