Problem using ST-uPSD uLINK to debug in uVision3

johnfu · ‎2007-06-22

Posted on June 23, 2007 at 02:00

johnfu · ‎2011-05-17

Posted on May 17, 2011 at 11:50

Hi, I have just bought ST uPSD33xx series development kit (DK3300-ELCD, uPSD3334D). In the kit, a keil uLINK USB-JTAG is included. When I use uLINK to debug , uVision shows the following error message :

''JTAG Communication Failure''

''*** error 122: AGDI: memory read failed (D:0x80)''

I can program the development kit using uLINK (Must disconnect the uLINK after programming, otherwise, it will not work), but cannot enter debug mode.

I observe that pin 8 in the J-TAG port, which is connected to the reset pin of the MCU, is always low. While I use another JTAG device (Raisonance RLINK-ST USB-JTAG Adapter, which work perfectly), the pin 8 is low only during program, when idle or debugging, pin 8 is high.

So, may be this the reason why uLINK doesn't work? Does it mean that Keil uLINK is broken?

Thank.

Best regard.

John