STM32F429VIT6 Connection Bare Metal

[AShah.12]

Hello, I am working on the project from scratch. I would like to know what are the minimum connections I will need for the STM32F429VIT6 in order to program? I have segger J-Link which I will be using. so far I have connect SWCLK (Pin 76), SWDIO (Pin 72), TDI (Pin 77), NJTRST (pin 90), and Vref 3.3V (Pin 75) and VSS (GND) (Pin 74). Is that the bare minimum connection I will need to connect the board and start programming? I did check the Datasheet, Ref manual and programming guide but I am not 100% sure. I am getting an error.

[TDK]

SWD requires SWDIO+SWCLK+GND. J-Link supports SWD, I'd try that.

[AScha.3]

yes, i do same, just using stlink2 .

minimum to connect is: SWDIO+SWCLK+GND - as tdk said.

+ RST , if using it by j-link.

and all power pins vss, vdd, vdda must be used, with some cer.caps.

ah..

+ in debug config. -> select SWD + "software system reset" ! ( <- for stlink )

[AShah.12]

Hello TDK and AScha.3 I tried the SWD setting and connected SWDIO+SWCLK+GND but still no luck. can you please guide what are the minimum connections like VDD, VSS, Vcap1, Vcap2, etc?

Please see the attached pinouts. I am having a hunch that I am not biasing properly. Because the error message says "Could not connect to target. Please check power, connection and settings.".

[TDK]

If it’s a custom board, sounds like a layout issue or wrong part orientation. Post schematic if you can.
Don’t read too much into the generic error messages.

[AShah.12]

There is no custom board it is pretty much like extension board for LQFP100 pinouts. pretty much like breadboard. Do I need to connect all the VDD and VSS of the board to +3.3V and GND? I want to know what are the minimum pinouts I have to connect in order to bias properly? I used 100nf caps for Vcap1 and Vcap2 and connected to the ground.

[Tesla DeLorean]

VCAP1 VCAP2 need bulk capacitance, so likely 2u2 each, or bonded together with one 4u7

Aren't there power/wiring diagrams in the Data Sheet?

[AScha.3]

>like VDD, VSS, Vcap1, Vcap2, .. all of these, and correct cer.caps on vdd, vcapx .

i told you: ALL power pins !

+

boot0 to GND

, on RST a 10..100nf cap

+

see as reference : the circuit of a discovery board.

[AShah.12]

Hello AScha,

Yes I did follow your guidance and was able to connect boot0 to GND and also RST to 100nf cap and ground it. Still not working.

[TDK]

Sure sounds like a custom board to me.

There are a variety of sources to get this info. Datasheet, ST board schematic, or the stm32f4 hardware guide.

https://www.st.com/resource/en/application_note/dm00115714-getting-started-with-stm32f4xxxx-mcu-hardware-development-stmicroelectronics.pdf

[Tesla DeLorean]

Sounds like tacking flying wires to a handful of pins to me.

[AScha.3]

[TDK]

Caps should be placed next to the chip, not on a breadboard many inches away. What you're doing might work, if you get the connections right, but using a nucleo board seems like a better option.

[AShah.12]

Got it. Nucleo and discovery works great. But not with STM32F429VIT6 . I want to try this board because one of my project I cannot fit the entire board and I just want bare minimum. ​

[AScha.3]

with these long leads connecting vcc, gnd and the cer.caps -> no chance.

you have a chance to get it running, when you

• connect all gnd together with short wires direct soldered to the (bottom) pin headers pads.
• same for all vdd, vdda
• also vcap
• and cer.caps (maybe 4.7 uf) to vdd-gnd and vcap-gnd (also here, at pin header pads)
• and the rst 100nF also here