From 7306bfcbe1009b45192ff5592c5141aab44cd99b Mon Sep 17 00:00:00 2001 From: dakkar Date: Fri, 30 Mar 2018 20:05:41 +0100 Subject: timing tests --- trasmitter/README.rst.txt | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'trasmitter/README.rst.txt') diff --git a/trasmitter/README.rst.txt b/trasmitter/README.rst.txt index 4b9e310..d2fd957 100644 --- a/trasmitter/README.rst.txt +++ b/trasmitter/README.rst.txt @@ -38,3 +38,12 @@ sysfs interface`_, seem to be fast enough for our purposes. See the ``sender-chip.pl`` test program. +The timing via the sysfs interface is awful. + +It looks like we can drive the pins (not the XIO ones) via +memory-mapped registers: the sunxi-tools ``pio.c`` has most of the +code needed. + +We could write a C program to just send the signal train. Look at +``clock.c`` for a way to handle fast / real-time scheduling and +delays. -- cgit v1.2.3