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= Overview =
<section begin=overview />
This How-To is meant to be a starting point for people to learn use UART for IGEP devices as quickly and easily as possible. In this howHow-toTo, we use [http://labs.isee.biz/index.php/Pre-installed_software_on_IGEP_Processor_Boards IGEP Firmware] and a program that use UART peripherals. This program How-To was tested in: *[[IGEP firmware Yocto|IGEP firmware Yocto]] with and [[Linux_Kernel_2.6.37.y|Kernel 2.6.37.y]]with IGEPv2.
<section end=overview />
= Preparing IGEP =
IGEP Uart devices have the following names in Kernel [[Linux Kernel 2.6.35.y|2.6.35.y]]:
*UART1: /dev/ttyS0
*UART2: /dev/ttyS1
*UART3: /dev/ttyS2
*UART4: /dev/ttyS3
IGEP Uart devices have the following names in Kernel [[Linux Kernel 2.6.37.y|2.6.37.y]]:
*UART1: /dev/ttyO0
*UART2: /dev/ttyO1
*UART3: /dev/ttyO2
*UART4: /dev/ttyO3
=== Configure UART1 and UART3 in IGEP with RS232 levels on J960 connector ===
;console=ttyO</pre>
==== Edit inittab file ====
Getty program uses /dev/ttyO2 in IGEP Firmware, disable it modifying /devetc/inittab file:
*Comment next line:
<pre> #S:2345:respawn:/sbin/getty 115200 ttyO2</pre>
#define GPIO1 158
#define GPIO2 162</pre>
Constant SIZE: it determines the max number of chars sended<br> .
Constant DEBUG: it can break program infinite loop part, useful to debug some errors: 0 (infinite loop) or positive number determines loop max entrances .
Constant WAIT: it configures select max timein seconds.
Constants GPIO1 and GPIO2: they configure GPIOs used for debug via oscilloscope. Default By default, 158 and 162 values are free not used in IGEPv2 J990 connector. make sure that if youuse other GPIO configure Configure [[Mux configuration|mux]] properly,<br> if you use other GPIOs.
= Testing UART =