Parallella Community

Hello,

I require 3.3V GPIO bank voltage levels, which means I need to reprogram the voltage regulators on the board to output a VDD_GPIO of 3.3 V. Is there a simple way to do this readily available?

The voltage regulator is set to its initial state through the boot procedure on the flash, which I can easily modify. Is there a simple way to change it in flash?

I2C on the Parallella can be used to program the chip while in operation. There is a project out there that does this for the Epiphany voltage level, and can even read all of the register values and confirm what the voltages are. This seems like a good starting point for changing the other voltage levels. Has someone done this before? Searches have not shown me any results on this. Link to the code: https://github.com/parallella/parallell ... management

Yes, changing GPIO voltage during run time works ine. Has been tested by us.
Has been used by patc on forums afaik.

Any sort of guide out there for doing it (or code ready to go)? If I don't have to make and debug my own code it would save me time.

What's wrong with the link that you found? Just compile and run it.
Andreas

The software is only for changing the voltage levels to the Epiphany chip, without modification it is not possible to change the other voltage levels. Correct me if I am wrong, though.

I made some simple modifications in order to set the voltage level to 3.3V so no biggy there, however I am still interested in whether or not someone knows how to change it in the boot image so this program does not have to be run.

For u-boot, the file to look at is on github.com/parallella
parallella-uboot/board/xilinx/zynq/board.c

Andreas

Thanks a lot! Will give this a try ASAP.