On Fri, 6 Sep 2013 08:25:20 +0100 Peter Maydell <peter.mayd...@linaro.org> wrote:
> On 6 September 2013 07:54, Antony Pavlov <antonynpav...@gmail.com> wrote: > > On Thu, 5 Sep 2013 19:17:50 +0100 > > Peter Maydell <peter.mayd...@linaro.org> wrote: > >> Does this UART really not have a FIFO? > > > > There is no public documentation on Digic chips. > > Only Canon's engineers know something about Digic's FIFO (if it exists :). > > You can deduce its existence though -- does the > UART let you feed two or three characters to it > at faster than whatever the serial line speed is > before it sets the "stop sending me bits" status > bit, or does it stop after the first? No, I can't :) How can I check this mysterious "stop sending me bits" status bit? Do you mean the UART hardware flow control pin? I can't use hardware flow control as I have only 3-wire UART on the camera. Moreover I have to enable hardware flow control in software, but I have no information how to do it. > If the real firmware uses this for anything remotely > serious (ie for more than trivial and default-disabled > debug info) it probably does have a FIFO. However, > let's assume it doesn't for now. > > -- PMM -- -- Best regards, Antony Pavlov
