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Known Issues

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J.B. Langston edited this page May 20, 2018 · 11 revisions

REV1 Board

  • The position of the CTS and VCC pin are swapped on the serial connectors. This doesn't affect anything unless you try to power the board from the serial connector by jumpering JP1 or JP2. It can be fixed by crossing the CTS and VCC wires running from the FTDI adapter to the Serial connector on the board, or simply leaving JP1 and JP2 unpopulated and powering the board from an external supply via the RC2014 bus.
  • The position of SPIA0 and SPIA1 on the 74HCT139N are swapped. This has been fixed in software by swapping the definitions for SD_SEL and AUX1_SEL in defines.h. The originally intended addresses will be used if CORRECT_SPIADDR is defined; otherwise the addresses will be swapped so they match those on the REV1 board.
  • The DTR trace near the edge of the board runs too close to the Serial 1 pads. On some boards, the solder mask near the ground pin does not cover the DTR trace, so a solder bridge can short them together. This can prevent the AVR from automatically resetting when programmed by avrdude and can damage the serial to USB adapter. This issue occurred on two of the three OSH Park-manufactured boards that I received. Other boards built by Seeed Studio using the same design files did not exhibit this problem. The problem can be fixed by cutting the Serial 1 DTR trace on either side of the GND pad and soldering a bodge wire from the DTR pad of the Serial 1 connector to the DTR pad of C7.

REV2 Board

The known defects in the REV1 board have been corrected in the updated KiCad design files as of May 2018, but the new design is untested. If you have either positive or negative experiences using the new design files, please let me know. The original design is available under the REV1 tag and all known defects can be worked around using the techniques described above.

All Boards

  • It is possible for the serial connection to provide enough leakage current to keep the SD card powered and therefore it may not be reset properly on power up. If the main RC2014 power switch is turned off while the serial adapter remains connected, the SD card may not work when the RC2014 is turned back on. To fix this, either momentarily disconnect the serial adapter to remove all power to the board, or eject and reinsert the SD card to remove power and reset it.
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