STM32F429 Discovery - No target connected

[marcsglover]

Posted on January 21, 2014 at 23:03

Hi, I've been using the STM32F429 disco for a month or so and never had any problems. I connected my disco board via usb to my pc today and I keep getting the ''No target connected'' message when I try to download compiled code to the board. I've checked the debug settings and no SW link device is found and similarly in the ST-LINK Utility I cannot get the disco board to connect. The program that I downloaded onto the board a couple of days ago still runs with no problems.

Please could someone help me with problem as I've never come across this before? Cheers :) #stm32f429 #discovery #st-link

[Tesla DeLorean]

Posted on January 21, 2014 at 23:55

Jumper the BOOT0 pin to the VDD pin next to it, and reset the board. If this allows you to erase and modify the code loaded, then it is likely that the code you have running is blocking access via SWD. This could be for any number of reasons, including modifying the GPIO pins related to SWD, DMA, WFI loops, or low power modes.

[marcsglover]

Posted on January 22, 2014 at 00:25

Hi, thanks for the quick reply. I have tried this and produces the same result; still no core-sight device connected :\

[marcsglover]

Posted on January 22, 2014 at 00:48

Think I might have figured out why it has done this... I configured PA7 as an analog input for ADC1 conversion (since free GPIO ADC pins are sparse on this disco board). Do you think this could be the problem since this pin has something to do with SW on CN3? How would I solve this... re-flash firmware? Cheers 

[marcsglover]

Posted on January 22, 2014 at 01:04

Don't know how but the board is magically working again?!?! Thanks for your help :)

[Tesla DeLorean]

Posted on January 22, 2014 at 02:57

PA7, not so much, got to watch PA13(SWDIO)/PA14(SWCLK), and a lesser extent PB3 (SWO) but that might be behind a solder bridge.

Yes the ADC options here are a mess, the board pretty much sucks up all usable pins for LCD and SDRAM.