Changes between Version 16 and Version 17 of expansion/gw16130

Timestamp:

04/29/2019 07:49:18 PM (5 years ago)

Author:

Ryan Erbstoesser

Comment:

update example and clarify CBUS

expansion/gw16130

@@ -53 +53 @@
 An FTDI FT231XQ USB to UART Chip is used to communicate with the Iridium Satcom modem via its serial UART.
 
+
 The FTDI GPIO pins control the modem:
  * CBUS0: SAT_ON (input to modem; 10k pull-down)
@@ -59 +60 @@
  * CBUS3: not connected
 
-Configure GPIO:
+'''Important''' Run the following to configure GPIO & enable the modem (only works with 4.20 kernel or newer. Note that Newport is on 4.14) :
 {{{
 base=$(for i in $(ls -1d /sys/class/gpio/gpiochip*); do [ "ftdi-cbus" = "$(cat $i/label)" ] && cat $i/base; done)
@@ -76 +77 @@
 
 In a Linux system the UART mapping is dynamic. See the following for examples on determining the correct port mapping. Note these commands only work if there is a single FTDI device in the system. 
+
+If there is only a single FTDI device in the system, it typically will enumerate as /dev/ttyUSB0
 
 AT Commands via picocom: (only works if there is one ftdi device being used in the system)
@@ -99 +102 @@
  * Send message on Modem (to destination configured in modem admin where modem is registered)
 {{{
-AT&K0
-AT+SBDWT=Hello World
-AT+SBDIX
+AT&K0 # Prepare
+AT+SBDWT=Hello World #enter message as string
+AT+SBDIX # Send message
++SBDIX: 0, 4, 0, 0, 0, 0 #Response saying it was successful
 }}}
+  * To read more about the SBDIX response, read through one of the [https://www.google.com/search?q=iridium+9603+at+commands AT Command Documents]
+Troubleshooting:
+ * If no AT commands are working, verify the modem is enabled using the FTDI CBUS GPIOs. 
+
 
 == Mechanicals ==