Topic : running without usb connection

Forum : Other families

Original Post
Post Information Post
October 14, 2009 - 10:09pm

I am using the EM6819 development kit with V3.3 of the Reva board and V1.2 of the EM6819 daughterboard. I have programmed the NVM in the microcontroller, and it runs fine while connected to the PC and the Ride program through the USB cable. I would like to run the program on the eval board without it being connected to the computer.

I am providing a separate power supply through the power jack, and I have the source-select jumper set to "JACK." The "User Guide for the EM6819-based Daughter Board" says that in order to run without debug mode, I should jumper pins 1 and 3 together on the connector in the RLink area of the board, but when I try that, VCC on the board drops to nearly 0, and the "Power" LED goes off. If I don't connect that jumper, then the Power LED is on, but the board does not do anything. Is there anything else I need to do to make it run in a stand-alone mode? It seems that the RLink part of the schematics are not included in the documentation, which makes it difficult to debug this on my own.


Post Information Post
October 15, 2009 - 10:08am


What I am doing with Reva 3.3 is:
- For debug
Setting jumper USB---REGin
Setting jumper VDD--REGout for debug
Plugging USB cable

- To use as stand alone
Unplugging USB cable
Setting jumper REGin---JACK
Plugging 5V Alim on Jack
And the program runs by itself

I guess this is what you are doing and I do not see anything else to do.
I have noted that is sometime possible to set a jumper uncorrectly.
I mean jumper looks like it is set but the contact is not etablished.
May be you can check this because if you dont pay attention it is not easy to see.