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>
'mon traceswo' reports serial number and interface/endpoint no for libusb.
Interrupt priorities set so TIM3 for trace is highest priority.
Increased trace endpoint packet size to 64.
Buffer many trace packets into a single usb packet. Stall on overflow.
Fixed stop bit detection in TIM3 interrupt handler.
Richard Eoin Meadows
Gareth McMullin
Paul Fertser
Gareth McMullin