Setup — Preparing the STM32F429I-DISCO Board for eCos Development
Typically, since the STM32F429I-DISCO motherboard has a built-in ST-LINK/V2 interface providing hardware debug support, eCos applications are loaded and run via the debugger arm-eabi-gdb or via the Eclipse IDE. The debugger then communicates with the “GDB server” provided by the relevant host ST-LINK/V2 support tool being used (e.g. OpenOCD).
Normally for release applications the
type would be used, with the application programmed into the on-chip
flash for execution when the board boots. It is still possible to use
the hardware debugging support to debug such flash-based ROM
applications, and this may be the desired approach if the application
is too large for execution from SRAM, or where all of the SRAM and
SDRAM is required for application run-time use.
Since the stand-alone STM32F429I-DISCO motherboard has limited I/O there is no support for either RedBoot or GDB stubs by default.
Nevertheless, it is still possible to program a GDB stub or
ROM image into on-chip Flash and download
and debug via a serial UART, if pins for the UART are available. In
that case, eCos applications are configured for
startup and then downloaded and run on the board via the
debugger arm-eabi-gdb, or via the Eclipse IDE. By
default for serial communications, all versions run with 8 bits, no
parity, and 1 stop bit at 115200 baud. This rate can be changed in the
eCos configuration used for building the
Programming ROM images
Since the STM32F429I-DISCO board has a built-in ST-LINK/V2 SWD
interface, if the
CN4 jumpers are closed then the
micro USB host connection (CN1) and suitable host software (e.g. The
OpenOCD package openocd tool) can be used to
program the flash. Normally a default openocd
session provides a comand-line via
4444. Consult the OpenOCD documentation for
more details if a non-default openocd configuration
is being used.
With a telnet connection established to the openocd any binary data can easily be written to the on-chip flash. e.g.
telnet localhost 4444Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. Open On-Chip Debugger >
flash write_image test.bin 0x08000000wrote 32518 bytes from file test.bin in 1.073942s (29.569 KiB/s)
To create a binary for flash programming the arm-eabi-objcopy command is used. This converts the, ELF format, linked application into a raw binary. For example:
arm-eabi-objcopy -O binary
|2021-04-29||eCosPro Non-Commercial Public License|