This implements special handling for SYS_OPEN to catch requests for
":tt" which is reserved by ARM for console input/output. They're
mapped to the appropriate GDB file descriptors automatically.
An additional file handle offset is introduced because ARM doesn't
consider zero handle to be valid.
Signed-off-by: Paul Fertser <fercerpav@gmail.com>
Implement bare minimum necessary to support console IO.
This works with standard newlib builds and is based on the reference
documentation:
http://infocenter.arm.com/help/topic/com.arm.doc.dui0471c/CHDJHHDI.html
Tested using gcc-arm-none-eabi-4_7-2013q1-20130313 for both
stm32f1-based BMP and stm32f0 target.
Signed-off-by: Paul Fertser <fercerpav@gmail.com>
This patch introduces a new command, "connect_srst [enable|disable]"
which allows to enable special mode in which SRST would be pulled low
before the SWD scan till attaching to a target.
Since on Cortex-Mx the SRST signal doesn't gate JTAG and SWD, it's
possible to connect to a target while holding reset, ask it to stop at
reset vector and only then deassert reset, thus allowing to attach to
the kind of firmware that goes immediately to sleep or disables
debugging by other means early on start.
Tested on an STM32VLDiscovery board with STM32F100 configured to go to
STOP mode and executing WFI in the very beginning of main().
Signed-off-by: Paul Fertser <fercerpav@gmail.com>
USB UART seems to work fine at 115.2Kbps or 230.4Kbps, but starts to drop characters
as the data rate goes higher. This commit changes the usbuart ISR to fill a software
FIFO, and adds a low priority timer interrupt to run deferred processing to drain a
FIFO and send USB CDCACM packets, rather than calling the usb send within the UART
ISR.
Tested on native platform, up to 1.5MBps.
With gcc-arm-none-eabi-4_7-2013q1-20130313 and -O2 I get
text data bss dec hex filename
45744 304 2376 48424 bd28 blackmagic
With -Os the results are even more impressive:
text data bss dec hex filename
37900 304 2376 40580 9e84 blackmagic
Since -Os might lower the debugging speed, do not enable it yet in the
absence of real measurements.
Signed-off-by: Paul Fertser <fercerpav@gmail.com>
This reverts commit 32b909067b2a34f475a52585b965c195de87c172.
This CRC routine doesn't work. The bit order used by the
STM32 CRC unit is reveresed from what GDB uses.
This commit adds a variant of the Blackmagic Mini that uses only 0603
parts and standard connectors for better availability and easier manual
soldering.
Additionally, another voltage regulator has been used that is
cheaper, pin-compatible and has better characteristics.
The introduction of the double buffering broke USB flow control, causing
loss of data when a new packet arrived with the previous still present in
the double buffer.
With this patch the endpoint is kept in NAK until the double buffer is empty.
