STM CircleOS forum / STM32F4-Discovery JTAG?

marggl0r · 2012-03-19 00:25:21

Hello,

I'm working with the STM32F4-Discovery Board and the atollic TrueStudio Lite and I'm a absolutely Newbie with that.

When I was excercising with de GPIO's i configured all Port Pins of GPIOA as outputs, and wrote this to the flash.

Since then I can't communicate with the board, maybe because the JTAG/SWD Port ist using the GPIOA Pins. But in the Reference Manual I found this:

The JTAG pins are in input pull-up/pull-down after reset:
● PA15: JTDI in pull-up
● PA14: JTCK in pull-down
● PA13: JTMS in pull-up
● PB4: NJTRST in pull-up

Can someone tell my what I can do now?
Marcel

marggl0r · 2012-03-20 09:33:32

Now I have a Solution:

To start into the Boot Loader, put a 270R resistor between 5V and BOOT0 pin on the discovery board and push RST button. Then erase the flash or load the new build. Reset with BOOT0 Pin unattached.

# 1 2012-03-19 00:25:21 STM32F4-Discovery JTAG?

STM32F4-Discovery JTAG?

# 2 2012-03-20 09:33:32 STM32F4-Discovery JTAG?

Re: STM32F4-Discovery JTAG?

Board footer