On Mon, 18 May 2015 07:18:44 -0700, you wrote: >On Mon, 18 May 2015 08:23:14 +0100, Mike Harrison >wrote: >>An issue is you need to generate six SPI serial streams - with a fast de= vice that has pin mapping, >>you can use the SPI hardware and send data sequentially using 2 SPI ports= , mapping them to each of 3 >>sets of pins in turn to do each colour.=20 > >>From my understanding of SPI you would only need one SPI stream/port to >all of them in common, plus switching the select line of each device one >at a time. Isn't that right? No because it isn't actually SPI - I was using SPI in its very loosest sens= e of being a synchronous clock & data. The panels have a single clock & latch, and either 3 or 6 data lines depen= ding on panel size - 16 pixel high panels have 3, 32 pixel high panels have 6 as they feed the uppe= r and lower halves in parallel.=20 They always have 16 rows, with an onboard row decoder. =20 --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .