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" "JTAG Communication Failure" "JTAG Communication Failure" "JTAG Communication Failure" "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
Would you mind telling me that the transistor is NPN or PNP or the model number? Thanks ^^
It's a BC850C (NPN)