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Updated Board STM32F745 Discovery (markdown)

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Dave Hylands 2015-10-28 10:24:42 -07:00
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Board-STM32F745-Discovery.md

@ -1,7 +1,7 @@
Cortex M7 STM32F746G
* Home - http://www.st.com/stm32f7-discovery
* [STM32F7 Discovery Home Page](http://www.st.com/stm32f7-discovery)
* [STM32F746xx Datasheet](http://www.st.com/st-web-ui/static/active/en/resource/technical/document/data_brief/DM00037955.pdf)
* [STM32F74xxx Reference Manual]
* [STM32F74xxx Reference Manual](http://www.st.com/web/en/resource/technical/document/reference_manual/DM00124865.pdf)
* [Board User Manual](http://www.st.com/st-web-ui/static/active/en/resource/technical/document/user_manual/DM00190424.pdf)
###Features###
@ -32,8 +32,30 @@ The board doesn't provide a convenient way to enter DFU mode. There are several
DFU mode is available on the USB FS connector (CN13)
* You can short the pads where R42 would be installed (it isn't installed by default) and press the reset button. You should now be able see the board when using ```dfu-util -l```
* I chose to install a switch between the MCU side of R42 and 3.3v (see picture below).
* You can install the initial micropython image using the STLINK interface, and then use pyb.bootloader() to enter DFU mode from the REPL.
* You can install the initial micropython image using the STLINK interface, and then use pyb.bootloader() to enter DFU mode from the REPL. See the [[Building st-flash|Building-st-flash]] page for some instructions on how to build st-flash.
Here is a link to a photo of [my modified STM32F7 Disocvery Board](https://www.dropbox.com/s/bbypmt8tennczh7/STM32F7-Discovery.jpg?dl=0)
The white wire connects to R42. CN13 has a USB cable plugged into it. The FTDI board is plugged into D0 (RX) and D1 (TX).
The red wire connects to 3.3v on R39.
###REPL###
UART1 from the STM32F7 is connected to the stlink MCU, and until USB-serial is working, the software is configured to have a REPL on UART1. The stlink MCU acts as a USB serial dongle.
I use the following file (which I call 49-stm32.rules):
```
# 0483:5740 - STM32F4/F7 Dsicovery in USB Serial Mode
ATTRS{idVendor}=="0483", ATTRS{idProduct}=="5740", ENV{ID_MM_DEVICE_IGNORE}="1"
ATTRS{idVendor}=="0483", ATTRS{idProduct}=="5740", ENV{MTP_NO_PROBE}="1"
SUBSYSTEMS=="usb", ATTRS{idVendor}=="0483", ATTRS{idProduct}=="5740", MODE:="0666"
KERNEL=="ttyACM*", ATTRS{idVendor}=="0483", ATTRS{idProduct}=="5740", MODE:="0666"
# 0483:df11 - STM32F4/F7 Discovery in DFU mode
SUBSYSTEMS=="usb", ATTRS{idVendor}=="0483", ATTRS{idProduct}=="df11", MODE:="0666"
```
and install it using:
```
sudo cp 49-stm32.rules /etc/udev/rules.d
sudo udevadm control --reload-rules
sudo udevadm trigger
```
That covers off DFU mode and the USB-serial link from CN14 (labelled USB ST-LINK, mini B connector). CN13 (labelled USB_FS, micro B connector) goes directly to the F7.