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Error in Using ST-LINK/V2 to program an external STM32 application

Question asked by nguyen.nhan.002 on Mar 17, 2014
Latest reply on Apr 1, 2014 by Clive One

I trying to use ST-LINK/V2 in STM32F4 discovery board to program an external application in SWD mode.
I connected Pin GND, Pin 3.3V, Pin SWCLK, Pin SWDIO from external board to ST-LINK/V2 and remove connection from ST-LINK/V2 to CM4 chip in STM32F4 discovery board. 
I use Keil ARM and in CORTEX-M DRIVER SETUP window, tool can recognize ARM CORE SIGHT SW-DP. But when I load, tool flag : "no taget connected"...
Please, help me. Are there any note at external board, I put BOOT 0 and BOOT 1 on external boad to 0V.