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1. 

   librae8226
   Member

   Hey guys,

   I am wondering if I can flash the maple_boot.bin(mini version) to mini board via serial port, using stm32loader.py.

   It prompts such information:
   ------------------------------------------------------------------------------------
   [librae@united ~]$ ./stm32loader.py -p/dev/ttyUSB0 -a0x08000000 -ewv ./mini_boot.bin
   Reading data from ../mini_boot.bin
   Can't init. Ensure that BOOT0 is enabled and reset device
   Traceback (most recent call last):
   File "./script/stm32loader.py", line 465, in <module>
   bootversion = cmd.cmdGet()
   File "./script/stm32loader.py", line 121, in cmdGet
   if self.cmdGeneric(0x00):
   File "./script/stm32loader.py", line 118, in cmdGeneric
   return self._wait_for_ask(hex(cmd))
   File "./script/stm32loader.py", line 69, in _wait_for_ask
   raise CmdException("No response to %s" % info)
   __main__.CmdException: No response to 0x0
   ------------------------------------------------------------------------------------
   Infact, I press BUT indeed. And I have also measured the BOOT0 pin, it's about 3.0V.
   BTW, use the same way to flash a maple board is just fine.

   Could anybody help? Or if mini version needs a special step to flash via serial?
   Thanks!

   Posted 4 years ago #
2. 

   poslathian
   LeafLabs

   You also need to ground the Boot1 pin. Then you should be all set.

   On maple Boot1 is already grounded.

   Posted 4 years ago #
3. 

   librae8226
   Member

   Thanks a lot :P
   I'll try that and then leave a reply here.

   Posted 4 years ago #
4. 

   librae8226
   Member

   Careless mistake...
   I've checked it with ST document.
   Thanks.

   Posted 4 years ago #
5. 

   rosendo
   Member

   I'm having the same problem, but even connecting Boot1 to Ground I can't solve it. I tried 2 different stm32loader.py (one with 16kb and other with 14kb).

   My board is also mini and I am having exactly the same error message. I am using an Arduino Duemilenove for the Serial communication. RX goes to TX and TX to RX. 3.3 goes to Vin and Ground goes to GND and BOOT1 (pin 2). Maybe my board is a different version? (I just bought it 15 days ago)

   I'm using Python 2.7 and installed py-serial 2.6. Also tried Python 2.5 and 3.2, combined with py-serial 2.5.

   Thanks for any suggestion....

   Posted 4 years ago #
6. 

   siy
   Member

   You can try to use this app: http://code.google.com/p/stm32flash/ instead of stm32loader.py. It works just great for me, while I was unable to make stm32loader.py work properly.

   Posted 4 years ago #
7. 

   mikep
   Member

   Hi rosendo,
   this may be unrelated, but the connection you mentioned "3.3 goes to Vin" seems wrong to me.
   Are you connecting the Arduino's 3.3V pin to Vin on the Mini? I think that won't work since the Maple Mini has an onboard voltage regulator and needs more than 3.3V on Vin to work. The Arduino 3.3V pin also can only deliver 50mA of current, which may not be enough for the Mini to properly program.
   I would only use 3 wires from the Arduino to the Mini: Rx, Tx, and Ground and power the mini over it's USB connection with a USB cable.
   Also, I think you need to take out the ATmega MCU from the Arduino board to use it as a programmer (you probably already know that, just wanted to mention it).

   Hope that helps,
   Mike

   Posted 4 years ago #
8. 

   rosendo
   Member

   I will change for a Linux computer to try siy method (something tells me that the problem is with Windows 7, or with me!).

   I tried everything suggested by mikep. I noticed that on 3.3 the LED was dimmer than when connected to USB, so I tried through USB and got the same results. I tried with and without Atmega. I hope I have more luck with Ubuntu in the next few hours.

   Probably my mistake is something very simple which I forgot to observe... They keep talking about this BOOT0, even though it is writen BOOT1 at the silk. I assume BOOT0 is the BUT button. Should I leave it pressed even during the flashing?

   Posted 4 years ago #
9. 

   mikep
   Member

   Hi rose do,
   One more thing came to mind: You did not mention which RX and TX pins you are using on the Maple Mini!
   The built-in flash loader uses USART1, so on the Maple Mini this would be pins 25 and 26 ( http://leaflabs.com/wp-content/uploads/2010/02/maplemini-r21.png ).
   Maybe you used pin 0 and 1?
   Also it seems you should power the Mini from USB as I mentioned before, since if the LED is dimmer it probably wasn't getting enough power.
   Mike

   Posted 4 years ago #
10. 

    rosendo
    Member

    I tried from Ubuntu and got the same error. I even tried the stm32flash suggested by siy, but still failed. Now I am thinking about trying a different arduino...

    I am using 25 and 26 (RX1 and TX1), where the RX1 goes to arduino pin 1 (TX) and TX1 goes to pin 0 (RX). Thanks for the help guys... I will try to find another arduino to keep trying.

    Posted 4 years ago #
11. 

    siy
    Member

    Perhaps it worth to use some other USB<->USART converter, there are a number of different ones available from various sources - from computer shops to ebay. For initial flashing of my boards I'm using very simple converter built on CP2102 and it works just great. I took scheme right from the datasheet, but in first version of my converter only three pins were broken out - RX/TX/GND. Later I've added 3.3V output and this made things even simpler - no need to use additional power source for flashed board (CP2102 on-chip voltage regulator capable to source up to 100ma, which is enough for my boards and, I think, for Maple Mini too). Despite small QFN package this IC is quite simple to solder it manually.

    Posted 4 years ago #
12. 

    gbulmer
    Moderator

    rosendo - have you got access to test equipment, for example an oscilloscope? You might be able to measure the voltages across the USART connections with it.

    IIRC, the FTDI FT232RL chip on the Arduino Duemilanove is set up to drive at 5Volts, which might be causing some problems. You might be able to confirm this with an oscilloscope (e.g by cat'ing a file to the Arduino's USB device with the ATmega pulled out).

    The 5V out from the FTDI FT232RL can be solved with a pair of resistors as a voltage divider, to divide down 5V to 3.3V. This might help. I think the Maple mini should be able to drive the FTDI. It should work because the FTDI FT232R spec says the switching voltage is 1.5V, but there might be something else going on. You should be able to see USART data coming back from Maple with an oscilloscope, and hence get an idea that the whole round-trip is doing something.

    I strongly agree with siy. Try a different USB<->USART if you can, to remove a possible cause of problems.

    I have used an ordinary FTDI 3.3V USB to USART cable to program STM32F1xx, along with the Python loader, and it works fine, though it is expensive compared to some other options. I decided saving a couple of hours faffing around more than paid for the FTDI cable.

    Posted 4 years ago #
13. 

    rosendo
    Member

    I decided to go for a FTDI 3.3V, as you guys suggested. It will arrive in a couple of days, so I will keep you guys posted! Thanks a lot for the help!

    Posted 4 years ago #
14. 

    rosendo
    Member

    Yes! And that was the problem! I bought something looking like an USB stick with an FTDI 3.3V and some place to solder RXD,TXD,GND and VCC cables. The procedure worked really well (sorry siy, I didn't need your stm32flash program.

    But something happened that made me really nervous. First I used the stm32loader.py from maple-bootloader/blob/master/flash ( https://github.com/leaflabs/maple-bootloader/blob/master/flash/stm32loader.py ) and this one didn't work at all. I tried to upload the example "Blink" after flashing and it failed while waiting for DFU.

    Then, I took the one from libmaple/master/support/ ( https://raw.github.com/leaflabs/libmaple/master/support/stm32loader.py ) and this one worked fine.

    Anyway... Thanks for the help guys!

    Posted 4 years ago #
15. 

    siy
    Member

    I'm glad that you have solved this issue. And no, stm32flash is not mine, I just found it while fighting with similar issue with my own board. I had much more "unknown" things that time - new for me MCU, new DIY just soldered board, new just soldered USB<->UART bridge, new flashing procedure (in fact, very convenient comparing to AVR MCU which I had used before), and so on and so forth. After a number of failed attempts with different versions of stm32loader.py, I was googling for something helpful and then found stm32flash site. In few minutes after compiling it I had board which appeared in USB devices list and couple minutes later it was blinking with LED after flashing compiled sketch. If I'll have chance to meet author of stm32flash in person I put him a box of beer :)

    Posted 4 years ago #

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