0
edits
Changes
no edit summary
= 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>
= Compile and run program =
Download [http://labs.isee.biz/index.php/File:Uart-test-2-beta1.tar.bz2 program source] and extract it. There Before compiling the program, there are some interesting things to configure, before compiling the program. Open program and seek next lines:
<pre>//Define Array char size
#define SIZE 30
#define GPIO1 158
#define GPIO2 162</pre>
Constant SIZE: it determines the max number of char than can be sent<br> chars sended.
Constant DEBUG: it can break program infinite loop part, it can be useful to debug some errors, : 0 (infinite loop) or positive number determine determines loop max entrances .
Constant WAIT: it configurea 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 =