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Firmware debugger via rs-232

 
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future



Joined: 14 May 2004
Posts: 330

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Firmware debugger via rs-232
PostPosted: Fri Jun 04, 2004 6:56 am     Reply with quote

Is there a way to debug firmware using a rs-232 connection to the circuit?

See www.mecanique.co.uk/code-studio/ their solution adds a header to the firmware to add the debug functionality. I´m looking for something like this, but for C.

You have a pic with a bootloader, then you load the header+firmware and use the built-in debugger to run step by step.
AllanL5



Joined: 05 Apr 2004
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PostPosted: Thu Jun 17, 2004 2:15 pm     Reply with quote

The way MBasic does this is to insert a debug call between every Basic token. I don't know how the Code Studio gets the debug information -- there's a slightly cryptic note that it uses "HSERIN/HSEROUT to send the debug information" which makes me think Code Studio does something similar.

If you wanted to debug 'C' code this way, you would need to develop a pre-processor which would insert a 'debug_pause()' entry or something between each 'real' line of 'C' code. Then compile with the 'debug_pause()' lines enabled.

'debug_pause()' should send some data to your monitoring program, and wait for you to give it a carriage return or something from your monitoring program. This way, you can debug over the same serial connection you program with.

The ICD hardware solutions do this in hardware -- since the ICD controls the clocking of the hardware. Simulators (like MPLAB 6.10 on have) let you do this in software -- but then you can't monitor the hardware pins to verify the rest of the circuit works.
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