Changes between Version 2 and Version 3 of ventana/DigitalIO

Timestamp:

09/27/2018 10:27:25 PM (6 years ago)

Author:

Tim Harvey

Comment:

clarify pin function mapping

ventana/DigitalIO

@@ -1 +1 @@
 [[PageOutline]]
 
-= Ventana Digital IO and I2C
-The intent of this page is to provide information about Ventana single board computers off-board digital IO signals including I2C
+= Ventana Digital IO
+The intent of this page is to provide information about Ventana single board computers general purpose off-board digital IO signals including GPIO, I2C, and PWM
 
 
 [=#dio]
-= DIO and I2C Mapping
-Ventana baseboards provide 4 digital IO signals to a connector. The IMX6 has 7 GPIO blocks having 32 GPIO's each which get mapped to gpio0 - through gpio 223. The various ventana product hardware manuals contain a table of what pins on the Digital IO connector routes to what IMX6 GPIO. In some cases these signals can be pinmux'd internally to one of four IMX6 PWM's.
+= DIO and pin function Mapping
+Ventana baseboards provide 4 digital IO signals to a connector. The IMX6 has 7 GPIO blocks having 32 GPIO's each which typically get mapped to gpio0 - through gpio 223 in the Linux kernel. Note that this mapping is not gaurunteed to stay the same across kernel versions - you can look at the debugfs {{{/sys/kernel/debug/gpio}}} file to see where the IMX6 GPIO controller is mapped.
+
+The various ventana product hardware manuals contain a table of what pins on the Digital IO connector routes to what IMX6 GPIO. In some cases these signals can be pinmux'd internally to one of four IMX6 PWM's or in other cases to an I2C controller.
 
 Ventana GPIO Mapping: