2025-01-07 12:51 PM - last edited on 2025-01-07 01:28 PM by Tesla DeLorean
@STOne-32 , @Peter BENSCH, @Tesla DeLorean
HI! I have my wiring below and I wonder what is wrong with it. Hope someone can give me some help!! my BOOT0 -> LOW, PDR_ON -> HIGH, BYPASS_REG -> LOW. And I have the following connections to the ST LINK:
NRST - SWDIO - SWCLK - TRACESWO.
Solved! Go to Solution.
2025-01-07 02:28 PM
Sounds like it's not powered up
VCAP should be 1.25V at viability
NRST should be pulled high internally to 3.3V or VDD
Make sure the PIN 1 is correctly orientated, bottom left corner with readable text on the IC, don't confuse with injection relief ports. Picture of the part on the board would be instructive.
BYPASS_REG : LOW
PDR_ON : HIGH
2025-01-07 01:23 PM
https://community.st.com/t5/stm32-mcus-products/boot-standalone-stm32f469iit6/td-p/758301
Please see my question/response at the end
Check part orientation
Check voltage present on VCAP pin, and capacitors
Check voltage observed on NRST pin
Provide a schematic, constrained to the STM32 if that's simpler, so we can better understand what you've built.
A large, clear and in-focus picture of the board with the part in-situ will also be illustrative.
The ST-LINK expects to see a target voltage on pin 1 or 2 of the standard JTAG 20-pin connector.
If you're getting connectivity issues in STM32 Cube Programmer, please show that whole screen, along with error message.
2025-01-07 02:08 PM
I Got this:
(I Have the same values at the pin and at the capacitor)
VCAP2 -> 360mV when I insert the probe, then it drops to 312mV.
VCAP1 -> 480mV.
NRST -> 396mV.
The total drawn read in the power supply is 0.07A.
I took closer pictures, and FYI, NRST goes from the switch (I was unsure what to do with it, so I put a switch to manipulate it.) to the ST-LINK. If any question seems odd, I apologize, this is my first time trying to design a PCB. I am a CS student and therefore I have never worked so close to the hardware before. Thank you!
2025-01-07 02:14 PM
2025-01-07 02:28 PM
Sounds like it's not powered up
VCAP should be 1.25V at viability
NRST should be pulled high internally to 3.3V or VDD
Make sure the PIN 1 is correctly orientated, bottom left corner with readable text on the IC, don't confuse with injection relief ports. Picture of the part on the board would be instructive.
BYPASS_REG : LOW
PDR_ON : HIGH
2025-01-07 02:33 PM
2025-01-07 02:33 PM
@Tesla DeLorean I have a little concern about the pin orientation. I know the dot marks the pin1, but I have 3 dots on the MCU, and therefore I assumed the pin 1 would be on the top left, as the top being oriented in a way that I can read the name of the chip. Did I do it upside down?
2025-01-07 02:37 PM
See image I posted above at same time you posted this.
Picture of yours would also be instructive as to what you've built..
2025-01-07 02:39 PM
> therefore I assumed the pin 1 would be on the top left, as the top being oriented in a way that I can read the name of the chip. Did I do it upside down?
You have it rotated incorrectly.
With the marking on the chip oriented normally from left to right, pin 1 is on the bottom left, as shown in the picture by @Tesla DeLorean .
2025-01-07 02:39 PM
Oh OMG, mine is upside down then! :face_with_tears_of_joy::face_with_tears_of_joy:
I will, solder it in the right place now. I will let you know how it goes, appreciate it!!!!