32F429IDISCOVERY Pinout / Free IO

[sultanof]

Posted on April 16, 2014 at 10:11

Hello

The

http://www.st.com/web/catalog/tools/FM116/SC959/SS1532/PF259090

has a few Free I/O Pins. Is there a list of alternate functions of those pins? It's not mentioned in the corresponding documentation DocID025175 Rev 1 I'm trying to evaluate whether the few I/O Pins are suitable for me or not. Regards Chriostoph

[nawfal3]

Posted on April 16, 2014 at 22:28

Is there any schematics (resistors, capacitors, Crystal....) showing a reference to connect a separate µC (STM32F429ZI or similar)?

[Tesla DeLorean]

Posted on April 16, 2014 at 23:26

[DEAD LINK /public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/Flat.aspx?RootFolder=/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/Minimum%20circuit%20for%20bare%20STM32%20F2%20lqfp64&FolderCTID=0x01200200770978C69A1141439FE559EB459D7580009C4E14902C3CDE46A77F0FFD06506F5B&currentviews=116]https://my.st.com/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/Flat.aspx?RootFolder=%2Fpublic%2FSTe2ecommunities%2Fmcu%2FLists%2Fcortex_mx_stm32%2FMinimum%20circuit%20for%20bare%20STM32%20F2%20lqfp64&FolderCTID=0x01200200770978C69A1141439FE559EB459D7580009C4E14902C3CDE46A77F0FFD06506F5B¤tviews=116

Pretty sure the

http://www.st.com/st-web-ui/static/active/en/resource/technical/document/datasheet/DM00071990.pdf

addresses some of the required connectivity, capacitors, etc

[nawfal3]

Posted on April 17, 2014 at 17:29

I tried to connect a separate µC (STM32F429ZIT_LQFP144) as shown in the document attached…

The problem is that when I connect the power source (3V) to the voltage line and I measure it, it gives low voltage (+/-0.2V)….It looks like I have some short circuit.

Can someone tell me if the pins connections are OK?

________________ Attachments : PINS.png : https://st--c.eu10.content.force.com/sfc/dist/version/download/?oid=00Db0000000YtG6&ids=0680X000006I05c&d=%2Fa%2F0X0000000bTM%2FXRhuK6YJoFHiKPyBGm0m_mjUXAskzc2K2PDhIEdUdVU&asPdf=false

[Tesla DeLorean]

Posted on April 17, 2014 at 17:43

The VCAP pins only need 2.2uF

The NRST pin should definitely not be connected to the supply. What's up with the 10K + 100nF? VSS (107) not VCC PDR_ON (143) connect to VDD Your design offers not method to test signs-of-life, you'd perhaps want to attach a CMOS Serial (not RS232 levels) connection to PA9/PA10 so you can use a terminal or Flash Loader Demonstrator Would probably add a 1uF on the supply

[nawfal3]

Posted on April 17, 2014 at 18:33

I've done the changes that you recommended...But I'm still getting small voltage.

It may be caused by some bridges formed during the soldering. Concerning the the external crystals are they mandatory?

[nawfal3]

Posted on April 17, 2014 at 18:48 Concerning the method to test it. I am planning to do a blinky led test

[Tesla DeLorean]

Posted on April 17, 2014 at 19:58

I've done the changes that you recommended...But I'm still getting small voltage. It may be caused by some bridges formed during the soldering.Concerning the the external crystals are they mandatory?

I can't speak to your solder skills, make sure you have the part correctly orientated. VCAP pins should be at 1.25V You do not need external crystals, and they will not start if you have them attached. The part starts up from the internal 16 MHz HSI. To get the blinky example working you'd still need a method to inject code, Serial, USB, or JTAG/SWD

[nawfal3]

Posted on April 17, 2014 at 20:16

Concerning the soldering, I used the university Equipment (Microscope to check...); but I'll go back tomorrow to recheck.

When I'll get the voltage problem solved I'll connect to the chip by SWD via the ST link of my STM32F429I-disco

[nawfal3]

Posted on April 21, 2014 at 20:47 As I connect the PDR_ON to Vdd it causes a short circuit.

[nawfal3]

Posted on April 21, 2014 at 21:10 I'm using a LQFP144 package