Extend README.md for FT232R and Limitations of PL2303

diff --git a/README.md b/README.md
index a5f6e77..d680929 100644 (file)
--- a/README.md
+++ b/README.md
@@ -1,9 +1,10 @@
-# PL2303 and CP2103 Userspace GPIO control tools
+# PL2303, CP2103 and FT232R Userspace GPIO control tools
 
 This is a set of small tools for linux userspace that allows you to interact
-with GPIO lines on PL2303HX and CP2103 devices. 
+with GPIO lines on PL2303HX, CP2103 and FT232R devices.
 PL2303: It has only been tested on PL2303HXA, but may work for other revisions. 
 CP2103: It has only been tested on CP2103, but may work for other revisions/versions.
+FT232R: It has only been tested on FT232R, but may work also for other revisions/versions.
 
 Since no common GPIO driver for those exists at the time of writing in
 the linux kernel - this should serve as a placeholder till upstream guys 
@@ -29,10 +30,10 @@ To automagically install and reload rules run
 sudo make install-rules
 ```
 
-and replug your pl2303/cp2103 dongles. You should no longer need root
+and replug your pl2303/cp2103/ft232r dongles. You should no longer need root
 permissions to access gpio in them. 
 
-## Do I have to close minicom / rmmod pl2303 to use this tool ? 
+## Do I have to close minicom / rmmod pl2303 or rmmod ftdi_sio to use this tool ?
 
 Nope. Just run it in a separate terminal whenever you need it
 
@@ -93,11 +94,47 @@ Examples:
         ./pl2303gpio --gpio=1 --out 1
         ./pl2303gpio --gpio=0 --out 0 --gpio=1 --in
 
+Notes:
+       pl2302gpio actually do *not* support for gpio>=2.
+       Witout notice gpio=0 is used in this case!
+
 All arguments are executed from left to right, you can add 
 delays using --sleep v option. e.g. 
         ./pl2303gpio --gpio=0 --out 0 --sleep 1000 --gpio=0 --out 1
 ```
 
+FT232R
+```
+FT232R userspace GPIO control tool
+(c) Peter Henn 2017, License: GPLv3
+Usage: ./ft232rgpio [action1] [action2] ...
+Options are:
+         --product=blah    - Use device with this 'product' string
+         --serial=blah     - Use device with this 'serial' string
+         --manuf=blah      - Use device with this 'manufacturer' string
+         -g/--gpio  n      - select GPIO, n=0, 1
+         -i/--in           - configure GPIO as input
+         -o/--out v        - configure GPIO as output with value v
+         -r/--read v       - Read current GPIO value
+
+         -s/--sleep v      - Delay for v ms
+
+Examples:
+        ./ft232rgpio --gpio=1 --out 1
+        ./ft232rgpio --gpio=0 --out 0 --gpio=1 --in
+
+Notes:
+       Changing the so called CBUS GPIO lines of the FT232R chip
+       requires prior a correct programming of the embedded EEPROM
+       of this chip. Ft232rgpio is tested only for gpio outputs
+       and altering only one GPIO line!
+
+All arguments are executed from left to right, you can add
+delays using --sleep v option. e.g.
+        ./ft232rgpio --gpio=0 --out 0 --sleep 1000 --gpio=0 --out 1
+```
+
+
 ## Limitations
 cp2303 code misses magic required for 'input' mode of GPIO lines. 
 
@@ -126,4 +163,4 @@ don't need udev rules on a mac.
 
 ## License
 
-GPLv3. I'm too lazy to copy all the text here. Google for it.
\ No newline at end of file
+GPLv3. I'm too lazy to copy all the text here. Google for it.