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arm:stm32f103c8t6 [2014/04/14 21:09] – [USB bootloader] redoxarm:stm32f103c8t6 [2014/04/14 21:54] – [Links] redox
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 There's a 8Mhz quartz (with PLL, the chip can run at 72Mhz), a 32.768kHz quartz (for the RTC), and that's pretty much all, but for only 10 bucks... It's okay =) There's a 8Mhz quartz (with PLL, the chip can run at 72Mhz), a 32.768kHz quartz (for the RTC), and that's pretty much all, but for only 10 bucks... It's okay =)
  
 +I have found a schematic that looks okay
 +{{ :arm:stm32f103c8t6:schematic.png?direct&200 |Board schematic}}
  
 ## Bootloader ## Bootloader
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 I haven't found many bootloaders that could work without an external switch, ... So I settled on a modified version of the [[https://github.com/leaflabs/maple-bootloader|Maple bootloader]]. Another one would have been [[http://feaser.com/openblt/doku.php|OpenBLT]] but the PC software seems Windows-only so... \>_< I haven't found many bootloaders that could work without an external switch, ... So I settled on a modified version of the [[https://github.com/leaflabs/maple-bootloader|Maple bootloader]]. Another one would have been [[http://feaser.com/openblt/doku.php|OpenBLT]] but the PC software seems Windows-only so... \>_<
  
-The Maple Bootloader provides DFU access. You can program to RAM or Flash. I won't go into details about DFU... On Archlinux, install the __df-utils__ package from the AUR, and then it's just "simple".+The Maple Bootloader provides DFU access. You can program to RAM or Flash. I won't go into details about DFU... On Archlinux, install the __dfu-utils__ package from the AUR, and then it's just "simple".
  
 <code>[redox@RedoXPS ~/STM32F103_Demo]$ dfu-util -d 1337:1eaf -a 1 -D ./main.bin -R <code>[redox@RedoXPS ~/STM32F103_Demo]$ dfu-util -d 1337:1eaf -a 1 -D ./main.bin -R
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 Some changes have been made: Some changes have been made:
  
 +* USB VID/PID have been changed
 * LED moved to PA0 * LED moved to PA0
 * LED timings changed * LED timings changed
 * Button removed * Button removed
 * Bootloader timeout also changed * Bootloader timeout also changed
-* It now used a little bit less than 16Kio; the user-program flash definition has to be changed accordingly...+* It now used a little bit less than 16Kio; the user-program flash definition has to be changed accordingly: it should start at 0x08004000 instead of 0x08000000 
 + 
 +__Note:__ With DFU, don't forget to "prepare" your bin file before use: 
 +    dfu-suffix -a ./main.bin -v 1337 -p 1eaf -d 0001
  
 The latest source is: {{:arm:stm32f103c8t6:maple-based-bootloader_20140414_2306.tar.gz|}} The latest source is: {{:arm:stm32f103c8t6:maple-based-bootloader_20140414_2306.tar.gz|}}
 +
 +
  
 ## Demo ## Demo
 +
 +Trying to figure out the bootloaders didn't let me much time, and I didn't have any real application, so I just set up a quick demo, two leds flashing on PA0 and PA1.
 +
 +The latest source is: {{:arm:stm32f103c8t6:stm32f103_demo_20140414_2316.tar.gz|}} made for the USB bootloader
 +
 +Since the last time I worked with ARM µC, I had a deeper look into RTOS, so I thought I would quickly try one. I settled on [[http://www.chibios.org/dokuwiki/doku.php|ChibiOS]], since it's opensource, actively maintained, and I like its name.
 +
 +Going though the forums, I also noted its little brother [[http://code.google.com/p/rtoslibs/|Nil RTOS]], and a different one [[http://www.ethernut.de/index.html|Ethernut]] I might try someday...
 +
 +Here's a quick demo (two LEDs, different rate): {{:arm:stm32f103c8t6:demo_armcm3-stm32f103_20140414_2325.tar.gz|}}. 
 +
 +Download ChibiOS 2.6.3 and extract this archive in the board folder, then cd in it, and _make_ (prepared for the Serial bootloader), and then flash.
  
 ## Links ## Links
 +
 +* [[http://www.st.com/web/catalog/mmc/FM141/SC1169/SS1031/LN1565/PF164476|STM32F103 product page]]
 +* {{:arm:stm32f103c8t6:stm32f103x8_xb.pdf|STM32F103x8 Datasheet}} (from STmicro, rehosted here)
 +* [[http://www.cs.indiana.edu/~geobrown/book.pdf‎|STM32Book]]
 +* [[http://tech.munts.com/MCU/Frameworks/ARM/stm32f1/]]
 +* [[http://www.fussylogic.co.uk/blog/?p=1238]]
 +* [[http://www.emcu.it/STM32.html]]
 +* [[http://www.olliw.eu/2013/stm32-this-and-that/]]
 +* [[http://darauble.wordpress.com/2014/01/09/hello-arm-ir-truputukas-teorijos/]] Not in english...