novski Posted December 30, 2013 Report Share Posted December 30, 2013 R11 belongs to CAN bus J18 its R9 that dosn't hurt if already soldered. And SA is SD on the schematic http://ucapps.de/mbhp/mbhp_core_lpc17.pdf this is the corrected text to copy: A second IIC port, which can also be used as an additional MIDI IN/OUT port (MIDI IN4/OUT4) if enabled in MIOS32 (add "#define MIOS32_UART_NUM 4" to the mios32_config.h file). MIDI IN4 will be available on the J4B.SC. If a 6N138 based optocoupler circuit should be connected, replace the 2.2k pull-up R10 by 1k, or add a second 2.2k in parallel to get 1.1k effectively. MIDI OUT4 will be available on the J4B.SD pin, it isn't required to remove R9 if already soldered - it doesn't hurt. I hope this is helpful and correct. best regards novski Quote Link to comment Share on other sites More sharing options...
TK. Posted December 30, 2013 Report Share Posted December 30, 2013 Thanks, fixed! :) Best Regards, Thorsten. Quote Link to comment Share on other sites More sharing options...
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