4-3 Renesas GPIO definition
Reference to the below Renesas GPIO document we mentioned in 4-1
r01us0488ej0109-rz-g_GPIO_UME.pdf
RZ/G2L can support up to 123 general-purpose I/O pins from 49 ports ( Page 8. Table )
Formula :
Page 14. in the above document:
For example: P42_4
id of P42_4 = 42 * 8 + 4 + 120 = 460.
It is used to export a GPIO pin in userspace.
Table 4-1 Example GPIO device nodes of RZ/G2L ( Page 16. in the above document)
Test :
cd /sys/class/gpio
echo 460 > export
ls -al
A new folder will be shown,
P42_4
Check the description about P42_4 in the above document,
Continue the below testing,
echo 1 > value ( error )
cat direction
in
echo “out” > direction
cat direction
out
echo 1 > value
cat value
echo 0 > value
cat value
Carrier Board
Now we want to find out the pin corresponding. Check the document of the carrier board.
Check the item
"Documentation"/ "Manual - Development Tools"/
"RZ SMARC Series Carrier Board User's Manual:Hardware"
in the below Renesas document,