LPC822 - Problems with debug wire connection

[lpcware]

Content originally posted in LPCWare by ledi007 on Thu Feb 04 09:13:29 MST 2016
Hi guys,

i have a problem with debugging the LPC822 (TSSOP20).
The controller is (it is a brand new controller) connectet to the LPC-Link board which i want to use as debugger.
I had connected the wires as in the pictures.

LPC-Link................. to ...................LPC822
3V3V ..............................................VDD (Pin 15)
GNDX.............................................GND (Pin 16)
JTAG_TMS_SWDIOX....................SWDIO (Pin 8)
JTAG_TCLK_SWCLKX..................SWCLK (Pin 7)
JTAG_RESETX..............................RESET (Pin 5)  (with an 10k pull-up to 3,3V)

[u]As i want to debug (with LPCXpresso) an example code i get the failure messenges in the console:[/u]

LPCXpresso Debug Driver v8.0 (Nov 17 2015 10:46:09 - crt_emu_cm3_gen build 305)
Debug bus check after stop (MemAP 0x4770031) FAILS - Em(01). Cannot find selected MEM-AP (check target power)
Debug bus check after stop (MemAP 0x4770031) FAILS - Em(01). Cannot find selected MEM-AP (check target power)
Debug bus check after stop (MemAP 0x4770031) FAILS - Em(01). Cannot find selected MEM-AP (check target power)
Failed on connect: Ep(01). Target marked as not debuggable.
Connected&Reset. Was: NotConnected. CpuID: 00000000. Info: HID64HS12
Error 0: OK
Last sticky error: 0x0 AIndex: 0
No debug bus (MemAp) selected
DAP Speed test unexecuted or failed
Debug protocol: SWD Frequency 3000 KHz. RTCK: Disabled. Vector catch: Enabled.
(100) Target Connection Failed


Can anybody help me, whats wrong?

[lpcware]

Content originally posted in LPCWare by ledi007 on Fri Feb 05 02:20:30 MST 2016
Hello,

now, seems it works :)

In addition, i had connect the SWO from LPC-Link with the controllers TDO pin.
but i am struggling with the meaning of the connection SWO to TDO!

Can anybody explain, why it works with SWO :quest:
And when do i need the ISP entry :quest:
In addition a picture of the connections i had done.

[lpcware]

Content originally posted in LPCWare by vtw.433e on Thu Feb 04 23:39:06 MST 2016
Looks like sort of error you get if your target is not correctly powered.

[lpcware]

Content originally posted in LPCWare by lpcxpresso-support on Thu Feb 04 10:40:38 MST 2016

With regard to your connections, nothing looks out of place. Please review these FAQs on LPCWare:

Design Considerations for Debug

Regaining debug access to target MCU

Thanks and regards,
LPCXpresso Support