Now, to use the HSI clock, specify an internal clock frequency in the
"clocks" config section, like this...
clocks = { internal = 16000000, cpu = 84000000 }
Don't specify an external frequency as well as the internal frequency.
The board as supplied does not provide any external clock to the F4.
It could supply an 8MHz clock from the STLINK part but, by default, it
isn't configured to do that.
So just use the HSI instead of the HSE - it won't be good for USB or fast
CAN bit rates but should be fine for bit banging, etc.
The Nucleo boards are like the Discovery boards in that they come with an
attached STLINK-V2 programmer. The MCU's UART2 is routed through the
programmer's USB connection and it appears as a VCP device on the host.
So far, this has only been tested to the extent that the elua shell and
lua prompt appear to be functioning as expected.
This should really be more than one commit, but here it goes anyway:
- added STM32F4 CDC UART support. For some reason, it seems to work only
on the OTG_FS interface, the OTG_HS interface enumerates it, but
doesn't seem to send/receive any data.
- removed the "platform interface" functions for CDC UART. That was
never really a platform interface, just a couple of functions reading
and writing data from/to a CDC UART. Now each backend takes care of this
as a special case in its platform_uart_xxx functions.
- added buffering support for CDC UARTs
- added uart.CDC to the uart module, so the CDC uart can be used directly
from Lua.
- stm32f4discovery now defaults to using the CDC, since it doesn't have
a dedicated UART connector.
- added STM32-P407 board from Olimex (no ext SRAM yet)
- added documentation for the new configurator parameters
Signed-off-by: Bogdan Marinescu <bogdan.marinescu@gmail.com>
- build_release.lua changed to use the new build system
- checked for proper compilation of all known configurations (boards/known/)
- fixed various small issues in the builder/utils library
- added 'disp_mode=minimal'
- (mostly) finished configurator docs
- arch_overview conterted to AsciiDoc and updated
- 'adc' parameters updates in all configuration files
- added 'config_only' option to the build system
