boredofchoosingnames

Hi Marcel & Yogi, Firstly, apologies Yogi for the slow reply. I meant to reply to say the USB OTG cable is a bit of a red herring. I have the same issue with any cable and the computer. Marcel, well done, you have found the answer I think. With your lead I did a search and found the link below: http://searchingforbit.blogspot.co.uk/2012/03/stm32f4discovery-eval-board-with.html So this guy is commenting on the problem for a completely unrelated application. I have had a moment to try this tonight and I find that with a USB cable on CN5 plugged in to my laptop and if i short SB10, the board boots into the MidiOS and I can get sound out of the Goom with the Ctrlr app (on a Win7 laptop). I don't have a core board, but I would imagine that if you either solder a jumper on the board as the link above (which I think I will), solder across the link or you solder a push-to-contact switch on that jumper you will be able to boot the board at will (without the second USB cable). I would note, that for me at least, if you boot the board without the second USB cable & jumper SB10 the LED LD1 will flash rather than turn on solid. The board will still boot properly and LD4 pulses as it should. Thanks again Marcel, you just made this a bit more fun and now I can start to play a bit more with this board. I might have a go at a core board too. If I was a cynic, I would suggest that ST saw how much fun people were having, and decided to make things more difficult for everyone. Best regards.

Hi Yogi Thanks for the pointers, I'll let you know how I get on. I've been too busy to touch this, hopefully the weekend will allow. My tablet use is with a USB on the go cable so the tablet acts as a host. So in theory it should run the goom off CN5 no problem. I can't get the board to run off a laptop with only CN5 either (normal cables). I have to briefly connect to CN1 (with the jumper place) and on removal of CN1 it will run off CN5 only. Roll on the weekend.

Hi All, I hope this is considered the correct part of the forum for this. I am a novice midi to MIDI and a general tinkerer. Not much of a musician either.... I saw the Goom Synth build on the STM32F4 and thought it looked like good cheap fun. I have managed to procure the board, install MIOS32 and upload the synth "project.hex" without too much stress. I don't have a good way of playing the synth (no keyboard ATM) so long term I wanted to try using an old Motorola Xoom as a touch interface, similar to "ttfshtt" or "AVLG". Currently I have managed to connect to the tablet using the Cntrlr interface created by "Synthy" (for which I am very grateful) on both Win7 & Ubuntu Studio. All the above was done with two USB cables attached which is a bit of a pain, so I tried the PA9 to 5V trick. Although the board appears to power up, I don't get the pulsing LED LD4, and LD1 (Com) flashes instead of being solid red. By accident I have just discovered that if I plug in CN1 temporarily whilst CN5 and the jumper are in place, I can get the board to boot. Interestingly, it is more complex than just getting power on the CN1. If I plug the board into USB power block whilst connected to my laptop on CN5, it won't boot. I needs a laptop USB to trigger the board (hope that makes sense). Has anyone experienced this and have a cure? it is a pain at the moment, and I would like to try playing with MIDI commander on either my Samsung Galaxy, or Motorola Xoom as a control interface. (currently I have managed to at least see the Goom in MIDI commander with my Galaxy and a USB OTG cable). The board I bought from Farnell is the "STM32F407G-DISC1" which seems to be an updated (but I can't tell how) version of the STM32F407. Any thoughts appreciated.