Hi all, I'm looking for someone to develop some HW and SW as a consultancy job for my employer, Huawei German Research Center, Munich. What we need is 16 channels of analog audio output (16 bit is OK, 24 preferred, 48 kHz sample rate) from a Raspberry 3B+ using the GPIO interface, using any of I2S, I2C or SPI or whatever seems best. You job would be to design the entire electronics, probably consisting of an FPGA and a number of D/A converters, the PCB, and all required SW. The SW would be the FPGA code, and an ALSA driver or any other solution allowing to use the interface from user space. It seems (see <https://github.com/hzeller/rpi-gpio-dma-demo>) that more than enough bandwidth is available using the GPIO pins. Strangely enough it also seems that using a CPU offers much better performance than using DMA. For driving the interface you can use one CPU of the Rpi up to 100%. Anyone interested please get in contact with me off-list. Ciao, -- FA