Question
No device found on target with external ST-Link to Nucleo-F070RB
Good afternoon
Before doing a final PCB design I wanted to test external ST-Link connectivity to the F070 on my Nucleo-F070RB board..
So therefore I:
- Removed SB12 and SB15 (disconnect nRST and SWO)
- Removed jumpers on CN2
- Attached external ST-Link
- ST-Link Pin 4 -> GND
- ST-Link SWDCLK Pin9 to CN2 Pin 2
- ST-Link SWD Pin 7 to CN2 Pin 4
Selected "Run->Configurations" and selected the external ST-Link by its serial number...
When I hit "Run" it tells me always that no device could be found...
On PA13/PA14 I see with a scope that something is happening....
Interestingly when I connect the internal ST-Link just with SCLK and SWD from CN2 to CN4 I can reprogram the F070RB MCU...
So is something wrong with my external ST-Link programmer?
Hooked up a Segger J-Link....had to set clock to 1000kHz...but he recognized the chip and could flash it....though it complained about flash being blocked for reading...