How to run a program?

kebap · ‎2005-05-10

Posted on May 11, 2005 at 04:31

kebap · ‎2011-05-17

Posted on May 17, 2011 at 12:06

Hello!

We have a problem with our uPSD3254a.

We have load a demo-program(initialize a display and put out a character)

with PSDsoft Express to our microcontroller,but the LCD doesn't display anything.

Does a start condition for the microcontroller exist?

What have we to do, to run the microcontroller.

Regards preines

rk1 · ‎2011-05-17

Posted on May 17, 2011 at 12:06

hi,

no, there is no ''start condition''. but make sure to configure/trigger or disable the watchdog.

if you want to know if the microcontroller is running, configure 1 pin as output and toggle it in an endless loop, and then look at the pin (i.e. with an oscilloscope).

thomasthanner9 · ‎2011-05-17

Posted on May 17, 2011 at 12:06

Hello,

there are actually two conditions that can stop a uPSD from running. First is the Watchdog as already mentioned by rk__. Second is the pullup at the USB_D- pin. This pullup is required even on non USB-devices. Maybe that is what is missing from your design?