Changes between Version 35 and Version 36 of expansion/gw16130

Timestamp:

07/06/2020 06:14:29 PM (4 years ago)

Author:

Tim Harvey

Comment:

updated ftx-prog instructions

expansion/gw16130

@@ -82 +82 @@
 }}}
 
-=== Procedure for 4.20 kernel or prior ===
-Because support for controlling the FTDI GPIOs was introduced in Kernel 4.20, a program (ftx_prog) can be used to control GPIO via the EEPROM on the FTDI chip on earlier kernels. 
+=== Procedure for kernels prior to Linux 4.20
+Because support for controlling the FTDI GPIOs was introduced in Kernel 4.20, a program (ftx_prog) can be used to configure the FTDI io-pins in the EEPROM on the FTDI chip on earlier kernels. Configuring CBUS0 as 'drive-1' makes it always output a logic high enabling the modem and removes the need (and ability) to manipulate the gpio to turn the modem on/off.
 
 This is an open source program located here: https://github.com/richardeoin/ftx-prog
 
-The following commands are used to control the GPIO:
-{{{
-sudo ./ftx_prog --cbus 3 Keep_Awake #prevent suspend mode
-sudo ./ftx_prog --load-vcp true #force the loading of the virtual com port
-sudo ./ftx_prog --cbus 0 Drive_1 #drive GPIO 0 high to enable modem
-sudo ./ftx_prog --dump #print FTDI EEPROM Configuration
+Building:
+{{{#!bash
+sudo apt-get install git build-essential gcc make libftdi-dev
+git clone https://github.com/richardeoin/ftx-prog.git
+cd ftx-prog
+make
+}}}
+
+The following commands are used to re-configure the CBUS0 pin to keep the modem always enabled:
+{{{#!bash
+sudo ./ftx_prog --cbus 0 Drive_1 # configure CBUS0 as always output high
+}}}
+
+And if you want to re-configure it to change it back to a GPIO (in which case you will need a Linux 4.20 kernel or newer or a userspace application to configure the ftdi-cbus gpio):
+{{{#!bash
+sudo ./ftx_prog --cbus 0 GPIO # configure CBUS0 as GPIO
 }}}