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STM32 STM32F4DISCOVERY arm eval board and Linux

Picked up this eval board at the last Embedded Systems Conference, and finally starting to work with it. The chip is a 168MHz ARM Cortex M4 with 12-bit A/D and D/A's . The eval board includes an accelerometer, microphone, and separate audio D/A chip, among other things. Pricing is really interesting. Here are Digikey quantity-1 prices:
STM32F407VGT6     $16.00
STM32F103C8T6    $ 5.71
(The F407 is the main ARM chip, and the F103 is a smaller ARM chip used as a programming interface). So the eval board is actually cheaper than the chips on it.

The F407 chip has a built-in program loader using either the serial port or the USB port. Both are supported by Linux tools, so I'm ignoring the F103-based programming port and using the F407's USB port.

Connections: I have USB cables from my Linux box to both the F103's mini-USB connector at the top and the F407's micro-USB connector at the bottom. The mini-usb is just used to supply power to the board, and isn't necessary if an external supply is used.

The programming tool is dfu-util, from . I downloaded and built the latest version from the git repository. To test it, I used the miniblink example program from the libopencm3 package at . libopencm3 uses the summon-arm toolchain, so I downloaded and built that as well so the example would compile easily. (This also means I now have 5 different versions of GNU GCC for ARM on my system: summon-arm (linaro-based), 2 from CodeSourcery, one from openembedded, and a built-from-scratch GCC. One of these days I'll simplify that).

To program, I connect a jumper between the 3V and boot0 pins on connector P2. After hitting the black reset button, lsusb shows USB devices connected as:
Bus 001 Device 011: ID 0483:df11 SGS Thomson Microelectronics STM Device in DFU Mode
Bus 001 Device 012: ID 0483:3748 SGS Thomson Microelectronics ST-LINK/V2
To use it without being root, I also added the line:
SYSFS{idVendor}=="0483", SYSFS{idProduct}=="df11", MODE="666" GROUP="plugdev" SYMLINK+="usb/stm32_dfu"
to plugdev (in Debian, I just created a new file in the /etc/udev/rules.d directory with this single line in it. Locations may be slightly different in other Linux distributions).
With that done, the command:
dfu-util  --device 0483:df11 --alt 0 \
        --dfuse-address 0x08000000 \
        --download /miniblink.bin
works. I removed the jumper and hit reset again, and a single LED blinks, as expected.

So that's "Hello, World" for the STM32F4DISCOVERY. Now I can start doing real work with it.

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