06

EMBEDDED PROGRAMMING

This week, I am supposed to learn embedded programming this week, but I spent time designing and fabricatin the board and have not made it work.

I first continued to fabricate the board I designed two weeks ago. After changing the mill end, the milling machine worked as expcted this time. However, after soldering the parts, I found out the LED keeps lighting after plugging in and I cannot programm the bootloader into it. It gives a very general error message of "invalid response during transfer" and I cannot find out the reasons.

Therefore, I decide to redesign the board and try again. I learned more about the knowledge about electronic design by reading more datasheets and looking others' designed boards. Having Miana checked the schematics, I proceeded to route the board and fabricate it. However, this time the board is not responsing at all. I tried to debug with multi-meter but didn't figure out the problem. I will continue to work on this during this week.

Comingback! To reduce the stesp I need to debug, I decide to adopt a PDB design that ensured to work from examples provided and slightly modify that. I found SVG-PCB is very suitable for this purpose and thus learned to use that. But again, I cannot bootloader the board. Thanks to Quentin and Miana, I found the problem turned out to be the mimacthed pins. Then by matching the pins with seperated wires, I eventually can program the board with the free-DAP I made. I also found that on my Mac, the edbg doesn't work, but Open OCD works pretty well.