dwelch67 / Stm32f4d
Programming Languages
Got my STM32F4DISCOVERY board today from digikey. I didnt know there was a cortex-m with an fpu so I wanted to try it out. Cost about $20, they are giving these things away you might as well get one.
http://www.st.com/internet/evalboard/product/252419.jsp
Under the Design support tab you will want to download the users manual
UM1472: STM32F4DISCOVERY STM32F4 high-performance discovery board
It contains the schematic so we can figure out where the leds and other stuff are on the board.
It uses the STM32F407VGT6 part
http://www.st.com/internet/mcu/product/252140.jsp
You are definitely going to need the reference manual under the Design Support tab.
RM0090: STM32F405xx, STM32F407xx, STM32F415xx and STM32F417xx advanced ARM-based 32-bit MCUs
You are also going to want the TRM for the ARM cortex-m4f core
http://infocenter.arm.com/help/topic/com.arm.doc.ddi0439c/DDI0439C_cortex_m4_r0p1_trm.pdf
I derived a command line loader from
https://github.com/texane/stlink
which is a gdbserver for the various stm32 stlink boards. Mine is limited to this board. You only need the mini-b usb plugged in to use the stlink interface, powers the board and communicates with the stlink interface.
Another way to load is to remove the zero ohm resistor on solder bridge SB18. SB18 as shipped shorts boot0 to ground. With boot0 high the normal embedded bootloader runs on the stm32f4. It happens to be a dfu based usb bootloader. You will need the micro-b usb connected as well. this util works on ubuntu:
http://gitorious.org/~tormod/unofficial-clones/dfuse-dfu-util
Power cycle or reset the microcontroller with boot0 floating wait a few seconds then
dfu-util -d 0483:df11 -c 1 -i 0 -a 0 -s 0x08000000 -D myprogram.bin
After loading, short boot0 to ground and reset again to run your program from flash. Open boot0 and press reset to try again.
If you leave boot0 tied to ground, it is as if SB18 were connected and you can use the stlink interface.
I decided to separate/isolate the stm32f4 discovery samples from the stm32 value line discovery samples so now this is in its own repo
UPDATE: openocd supports the stlink interface. I have tried this stm32f4 discovery and the stm32f0 discovery boards so far (both stlink version 2). You do not need to desolder the boot0 solder bridge. On the stm32f0 at this time it does not write the flash, I dont know if that is also the case for the stm32f4, dfu-util does make flash writing very easy.
http://openocd.sourceforge.net/
If you svn the latest you will need to run the bootstrap command below otherwise start with the configure command. You may wish to change the --prefix. I have an openocd install that has a different interface installed, and dont want to confuse you by mixing them so I am building an placing in directory then adding that path before using openocd. I downloaded the 0.6.0 tarball and started with the configure line.
./bootstrap ./configure --prefix=/stlink --enable-maintainer-mode --enable-stlink make sudo make install
then before using I
PATH=/stlink/bin:$PATH
(TODO: provide stm32f4discovery.cfg, for now get it from tcl/boards directory in openocd sources)
To load a program in sram and run it the simplest way to do it is to have one terminal in the directory that contains your binary file (elf format), this way you dont have to type in a path, then with openocd in your path
openocd -f stm32f0discovery.cfg
it will connect and mention some breakpoints and such.
In another terminal, doesnt matter what directory it is in,
telnet localhost 4444
This should connect to the other and you should see both screens reflect the connection. IF THE CONNECTION WORKS then
halt load_image blinker01.gcc.thumb.elf resume 0x20000000
If you happen to be running as root in that telnet window and the telnet doesnt connect and you type halt without thinking, you turn off your computer, a bit annoying...
I have focuses my stm32 examples in a different repo, stm32_samples. Guess I didnt pull this one in yet. Need to find where I put these boards, I have so many different ones now.