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[OpenOCD-user] OpenOCD using FT232H board
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From: wieniawski <wie...@ou...> - 2024-04-28 03:36:39
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<span>hi,
</span>
</div><div><span><br></span></div><div><span>I am trying to using OpenOCD using a FT232H board. (BTW, I am successfully using JLINK as the hardware adapter to connect to target STM32F407 board, so my software env and target board is OK).</span></div><div><span><br></span></div><div><span>and my command is</span></div><div><span>```bash</span></div><div><span>openocd -s d:/un-setup/OpenOCD/share/openocd/scripts/ -f interface/ftdi
</span><span style="line-height: 1.6;">/ft232h-module-swd.cfg -f target/stm32f4x.cfg</span></div><div><span>```</span></div><div><span><br></span></div><div><span>However, it turns out an error:</span></div><div><span>Error: Error connecting DP: cannot read IDR.</span></div><div><span><br></span></div><div><span>I guess that is due to an bus connection error between my FT232H board and target STM32F407 board.</span></div><div><span><br></span></div><div><span>I noticed that there are several lines in swd.cfg file:</span></div><div><span># Adafruit FT232H JTAG SWD
</span></div><div><span># Name Pin Name Func Func
</span></div><div><span># D0 J1-3 ADBUS0 TCK SWDCLK
</span></div><div><span># D1 J1-4 ADBUS1 TDO/DI SWDIO
</span></div><div><span># D2 J1-5 ADBUS2 TDI/DO SWDIO</span></div><div><span><br></span></div><div><span>Where, there are to SWDIO pin defined. And I tried both of these two pins connected to target MCU, same error happens.</span></div><div><span><br></span></div><div><span>Then I realized that SWDIO is a bi-direction pin. So I tried to uncomment there 2 lines in swd.cfg file</span></div><div><span>#ftdi layout_signal TDO -data 0x0002 -oe 0x0002
</span></div><div><span>#ftdi layout_signal TDI -data 0x0004</span></div><div><span><br></span></div><div><span>However, it came out same error again.</span></div><div><span><br></span></div><div><span>So I am guessing:</span></div><div><span><br></span></div><div><span>Do I need to short FT232H AD1 and AD2 together?</span></div><div>Or is there any extra short circuit like using TDO as the output enable signal to TDI?</div><div><br></div><div>Thx,</div><div><br></div><div><br></div>
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<br>
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