Embest AM3517 Specifications download pdf (Page 48)

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4.3.15 Digital Output Test

Pins 1 to 8 on the connector J6 can output the digital voltages 0V and 3.3V,

the default output is 3.3v.

1. Device introduction:

[root@OMAP3EVM /]# cd /sys/class/misc/digital/

[root@OMAP3EVM digital]# ls

dev out2 out4 out6 out8 power uevent

out1 out3 out5 out7 outall subsystem

As above, out1 corresponds to the pin1; the outall corresponds to pins 1 to

2. Set only one pin voltage (pin3):

[root@OMAP3EVM digital]# echo 1 > out3

[root@OMAP3EVM digital]# cat out3

3. Set all pins voltage:

[root@OMAP3EVM digital]# echo aa > outall

[root@OMAP3EVM digital]# cat outall

4.4 Linux Image Update

The SOC8200 supports MMC/SD boot or NAND boot; different start-up

modes have different methods for updating the image. Here we will

introduce the image update process under different start-up modes.

4.4.1 Update the image on an SD card

Preparation

The first step is to format the SD card. The HP USB Disk Storage Format Tool

is recommended:

The software can be downloaded from:

 http://www.embest-tech.com/resource/download/HP-USB-Disk-S

torage-Format-Tool.rar

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Embest AM3517 Specifications Page 48