10-pin debug connector and STLINK-V3-ISOL - not reliable?
I am using STLINK V3 with the ISOL board, and using the supplied 10-core cable, going to this connector in my 32F417 target
https://peter-ftp.co.uk/screenshots/202105072011602908.jpg
On the target connector, I have pins 3,5,7,9 grounded.
Pins 2,4,6,10 go to CPU pins PA13,PA14,PB3,PB4.
It works, but reliably only for code download. If I try to run SWV ITM data console, that also works but very soon I get a loss of comms. I am running at 8MHz; the ISOL debugger can go up to about 15MHz before it fails. I tried it at 1MHz but the same happened.
The wires to the CPU are pretty short - 5cm max.
I would be grateful for any ideas.
Console output:
------ Switching context -----
Target connection mode: Default
Reading ROM table for AP 0 @0xe00fffd0
Hardware watchpoint supported by the target
Failed to set com freq, status 0
COM frequency = 8000 kHz
ST-LINK Firmware version : V3J7M2B4S1
Device ID: 0x413
PC: 0x8025688
ST-LINK detects target voltage = 3.25 V
ST-LINK device status: HALT_MODE
ST-LINK device initialization OK
SWV_SetStatus(true): stop_reply_pending == 0
handle_vCont_c, continue thread
ST-LINK device status: RUN_MODE
ST-LINK device status: HALT_MODE
SWV_SetStatus(false): stop_reply_pending == 1
TraceCaptureStart and SWV event set to APP_FALSE (0)
NVIC_DFSR_REG = 0x0000000A
SWV_SetStatus(true): stop_reply_pending == 0
handle_vCont_c, continue thread
ST-LINK device status: RUN_MODE
ST-LINK device status: Failed to get status, Target not responding, retrying... 19
Target is not responding, retrying...
ST-LINK device status: Failed to get status, Target not responding, retrying... 19
Target is not responding, retrying...
ST-LINK device status: Failed to get status, Target not responding, retrying... 19
Target is not responding, retrying...