Changes between Version 36 and Version 37 of expansion/gw16130

Timestamp:

07/06/2020 06:18:04 PM (4 years ago)

Author:

Tim Harvey

Comment:

additional comments about gpio configuration

expansion/gw16130

@@ -62 +62 @@
 [[Image(16130-block-diagram.png)]]
 
-
 The FTDI GPIO pins control the modem:
  * CBUS0: SAT_ON (input to modem; 10k pull-down)
@@ -68 +67 @@
  * CBUS2: SAT_SUPPLY_OUT (output from modem)
  * CBUS3: not connected
+
+By default the FTDI EEPROM is configured by gateworks such that all 4 of the CBUS pins are configured for IOMODE/GPIO mode which means that you need to enable CBUS0 gpio to enable the modem.
 
 '''Important''' Run the following to configure GPIO & enable the modem (requires a 4.20 kernel or newer) :
@@ -81 +82 @@
 echo in > /sys/class/gpio/gpio$((base+2))/direction
 }}}
+
+Note that exporting the gpio's above will fail if you have used something like {{{ftx_prog}}} (below) to re-configure the CBUS pins to a mode other than IOMODE/GPIO.
 
 === Procedure for kernels prior to Linux 4.20