User manual

3.2 3.15 Test on digit output

The pins 1 to 8 on the connector J6 can output the digit voltage 0V and 3.3V, the default the

output 3.3v when reset the board.

1. Device introduce:

[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 the above, the out1 has corresponding the pin1, the outall has corresponding the pins for 1 to 8.

2. Set the only pin voltage:

[root@OMAP3EVM digital]# echo 1 > out3

[root@OMAP3EVM digital]# cat out3

3. Set the all pins voltage:

[root@OMAP3EVM digital]# echo aa > outall

[root@OMAP3EVM digital]# cat outall