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Cannot Connect to STM32F405RGT6 on Breakout (ST-Link V2)

Question asked by hon.bo_xuan on Dec 25, 2012
Latest reply on Dec 31, 2012 by Clive One
Hello all,

I created my own breakout board for the STM32F405RGT6, but I'm unable to connect to it via the ST Link V2. The error is "No Target Connected".

I've tested this with an external 8Mhz crystal (with load capacitors) and without. All other pins are simple broken out. I've successfully connected to the STM32F4 Discovery using the exact same method.

After some searching, I found that pulling the BOOT0 pin HIGH allows me to see if the device is working. Sending 0x7F at 9600bps 8E1 to USART3 returns inconsistent bytes (changes all the time). On all pins of USART1, there is no response. The same thing on the Discovery board returns the expected 0x79 (on the first try, something else on all others).

This is the first time I've developed a breakout for STM32 devices, and it is possible I've missed a connection required for it to work. So far, it is simply VDD, VSS, PH0, PH1, BOOT0 connected.

Any help will be appreciated! Thank you!