README
======
This README discusses issues unique to NuttX configurations for the
maple board from LeafLabs (http://leaflabs.com).
Microprocessor: 32-bit ARM Cortex M3 at 72MHz STM32F103RBT6 (STM32F103CBT6 for mini version)
Memory: 120 KB Flash and 20 KB SRAM
I/O Pins Out: 43 (34 for mini version)
ADCs: 9 (at 12-bit resolution)
Peripherals: 4 timers, 2 I2Cs, 2 SPI ports, 3 USARTs
Other: Sleep, stop, and standby modes; serial wire debug and JTAG interfaces
Please see below link for a list of maple devices and documentations.
http://leaflabs.com/devices
http://leaflabs.com/docs
This config supports Maple and Maple Mini.
Contents
========
- Development Environment
- DFU
Development Environment
=======================
Either Linux (recommended), Mac or Cygwin on Windows can be used for the development environment.
The source has been built only using the GNU toolchain (see below). Other
toolchains will likely cause problems. Testing was performed using the Cygwin
environment because the Raisonance R-Link emulatator and some RIDE7 development tools
were used and those tools works only under Windows.
DFU
===
The linker files in these projects can be configured to indicate that you
will be loading code using STMicro built-in USB Device Firmware Upgrade (DFU)
loader or via some JTAG emulator. You can specify the DFU bootloader by
adding the following line:
CONFIG_STM32_DFU=y
to your .config file. Most of the configurations in this directory are set
up to use the DFU loader.
If CONFIG_STM32_DFU is defined, the code will not be positioned at the beginning
of FLASH (0x08000000) but will be offset to 0x08005000. This offset is needed
to make space for the DFU loader and 0x08005000 is where the DFU loader expects
to find new applications at boot time. If you need to change that origin for some
other bootloader, you will need to edit the file(s) ld.script.dfu for each
configuration. In LeafLabs case, we are using maple bootloader:
http://leaflabs.com/docs/bootloader.html
For Linux or Mac:
----------------
While on Linux or Mac, we can use dfu-util to upload nuttx binary.
1. Make sure we have installed dfu-util. (From yum, apt-get or build from source.)
2. Start the DFU loader (bootloader) on the maple board. You do this by
resetting the board while holding the "Key" button. Windows should
recognize that the DFU loader has been installed.
3. Flash the nuttx.bin to the board use dfu-util. Here's an example:
$ dfu-util -a1 -d 1eaf:0003 -D nuttx.bin -R
For anything not clear, we can refer to LeafLabs official document:
http://leaflabs.com/docs/unix-toolchain.html
For Windows:
-----------
The DFU SE PC-based software is available from the STMicro website,
http://www.st.com. General usage instructions:
1. Connect the maple board to your computer using a USB
cable.
2. Start the DFU loader on the maple board. You do this by
resetting the board while holding the "Key" button. Windows should
recognize that the DFU loader has been installed.
3. Run the DFU SE program to load nuttx.bin into FLASH.
What if the DFU loader is not in FLASH? The loader code is available
inside of the Demo dirctory of the USBLib ZIP file that can be downloaded
from the STMicro Website. You can build it using RIDE (or other toolchains);
you will need a JTAG emulator to burn it into FLASH the first time.
In order to use STMicro's built-in DFU loader, you will have to get
the NuttX binary into a special format with a .dfu extension. The
DFU SE PC_based software installation includes a file "DFU File Manager"
conversion program that a file in Intel Hex format to the special DFU
format. When you successfully build NuttX, you will find a file called
nutt.hex in the top-level directory. That is the file that you should
provide to the DFU File Manager. You will end up with a file called
nuttx.dfu that you can use with the STMicro DFU SE program.
