About macfrenz

macfrenz · 2014-12-19

Posted on December 19, 2014 at 15:10I have a problem where USB OTG sometimes interferes with the ability to program the MCU though the mini USB port. Basically what happens is that when I try to program the MCU, the software on computer halts. When ...

macfrenz · 2014-12-25

Posted on December 25, 2014 at 11:00You're welcome > It seems that the value in the OPTCR is changed back to 0x00aaaae1 after reset or power-cycling.> That means it has to be done every time flash-programming is needed (eg. whenever you 'unlock').>...

macfrenz · 2014-12-23

Posted on December 23, 2014 at 17:05Look at the manual of the board, chapter 4.12, table 5. Pins which are connected only to P1 or P2 (and have their Free I/O column grayed) are free.

macfrenz · 2014-12-23

Posted on December 23, 2014 at 14:24> I tried writing the value 0x0FFFAAED to the OPTCR register to see if > that made any difference. So far I got an access error, so I probably > need to one of the a LOCK bits somewhere. (I already tried with bit ...

macfrenz · 2014-12-23

Posted on December 23, 2014 at 12:09> You're absolutely right, but I would still expect that OpenOCD didn't > complain about writing to RAM (which to my understanding, address > 0x10000000 is). 0x1000 0000 is CCM (core coupled memory) data ram. On F...

macfrenz · 2014-12-22

Posted on December 22, 2014 at 20:29Still it could be a faulty linker script, hence I suggested stripping everything unnecessary away from the linker script. The STM chip has some regions that aren't meant to be written by programmer, and the error ...

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