|
Problem |
Reason |
Solution |
|
Signature Bytes read as 0x00 0x00 0x00 |
ISP Frequency is to high. |
Lower ISP freq under the board settings |
|
Not able to communicate with device through debugWIRE |
RESET pullup resistor to small |
Remove or increase the pull-up value to 10K ohm or more. |
|
Not able to communicate with device through debugWIRE |
Decoupling Capasitor destroys communication on RESET line |
Remove Decoupling capasitor on reset line during debugWIRE emulation |
|
debugWIRE communication fails when using STK500 |
RESET line strongly tied to VCC |
Remove RESET jumper on STK500 to allow AVR Dragon to control the line. |
|
After successfully enabling the DWEN fuse, AVR Dragon is not able to enter debug mode |
RESET line strongly tied to VCC |
Remove RESET jumper on STK500 to allow AVR Dragon to control the line. |
|
Target voltage is read as 0V for on-board targets |
AVR Dragon get no reference voltage to the target voltage sensing. Target voltage is sensed from either pin 2 on ISP header or pin 4 on the JTAG header. |
In order to get reference voltage to the level converters of AVR Dragon, connect Pin 2 or 4 or 6 on the VCC header to pin 2 on ISP header or pin 4 on the JTAG header. Note that VCC pins on AVR Dragon are set to 5V and this procedure should therefore not be used for off-board targets. |
|
Target voltage is read as 0V for off-board targets. |
AVR Dragon get no reference voltage to the target voltage sensing. Target voltage is sensed from either pin 2 on ISP header or pin 4 on the JTAG header. |
Connect the target voltage from the target board to pin 2 on ISP header or pin 4 on the JTAG header. |
|
Not able to set ISP frequency |
AVR Dragon is not reading any target voltage. |
See above |
|
ISP/PP/HVSP programming fails |
AVR Dragon is not reading any target voltage |
See above |
|
Not able to connect to AVR Dragon, and status led is yellow |
AVR Dragon firmware upgrade failed, or firmware is corrupt. |
Go to the menu "Tools->Upgrade AVR Dragon" to perform a manual upgrade. |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|