I cant program my controller using st-link V2.

[SB1]

Hi,

    I am using stm32f103vc(100pin-LQFP) controller in my board while i try to program my board using st link v2 programmer it shows error message like "dev target held under reset".Programming pin connected as follows.

SWCLK--->PA14

SWDIO--->PA13

GND  --->GND

NRST  --->RESET OF CONTROLLER

Thanks&regards

senthilkumar.B

[Uwe Bonnes]

Is the target powered? Is reset eventually active?

[SB1]

yes...target board is powered.At initial stage reset is high without connecting programmer after connecting it reset pin is low.

[S.Ma]

Connect GND, VDD (of MCU), SWCLK and SWDIO.

The Vdd is monitored by ST Link to understand the SWD signal levels (1.8 ~ 3.6V)

If it is missing/GND, it is assumed the target is unpowered...

RESET command can be sent by SWD protocol most of the time.