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stm32f405 minimal wiring

Question asked by Angelo Dureghello on Mar 11, 2014
Latest reply on Mar 13, 2014 by Angelo Dureghello
i was trying to program stm32f405 through openpcd and a dcl5 parallel cable / interface that worked fine for other cortex cpu's.

Until now i can't program successfully the device, so i am wandering what are the minimal connections needed:

I connected:

All VDD (+3.3)

AS Jtag i connected only:
JTCK -> pin 76
JTDI -> pin 77
JTDO -> pin 89
JTMS -> pin 72

VDDA and VREF+ are connected to +3.3

connected 2 x 2,2u caps.

NRST is held high through RC circuit.

then i dindn't connected any external crystal,

all the rest is left unconnected.

Am i missing something important for a simple first flash programming  ?

many thanks