X-Git-Url: http://git.rot13.org/?p=trilby-hat-fpga;a=blobdiff_plain;f=README.md;h=3be04553e92b4d7266980c7e974aba53313d8e8e;hp=9faaed2872c0eca01ec6f56e5237ef1107050ade;hb=302c67c98a30def10b8b8845c6f820d9e8da130b;hpb=581839170af0aeffd0334b3eb19334b05f2e1013

diff --git a/README.md b/README.md
index 9faaed2..3be0455 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,31 @@
-# Trilby HAT ECP5 45k FPGA
+# Trilby HAT ECP5 FPGA SDR for Raspberry Pi
+
+http://www.kinetic.co.uk/Trilby.php
+
+This is my attempt at using open source tools to generate bitstream
 
 Run `make prog` to load the example to the board.
 
+
+## enable RTC
+
+Add to config.txt:
+
+```
+dtoverlay=i2c-rtc,ds1307
+```
+
+or execute in shell:
+
+```
+echo ds1307 0x68 > /sys/class/i2c-adapter/i2c-1/new_device
+```
+
+
+## read HAT ID eeprom
+
+Add to config.txt:
+
+```
+dtoverlay=i2c-gpio,i2c_gpio_sda=0,i2c_gpio_scl=1,bus=4
+```