The backend uses a new USB device stack and bulk endpoints. Only a
single instance of the backend function is currently supported. Both DAP
packet processing and the new backend are prepared to support multiple
instances, but require a user interface and minor modifications.
New backen has similar functionality to what is provided by the function
in the sample samples/subsys/dap.
Signed-off-by: Johann Fischer <johann.fischer@nordicsemi.no>
We need a way to update the value configured by option
CMSIS_DAP_PACKET_SIZE at runtime. For example, the USB backend may have
different values depending on the speed at which the device is being
enumerated.
Signed-off-by: Johann Fischer <johann.fischer@nordicsemi.no>
Add CMSIS-DAP compatible controller which is a handler between
the host interface and SWD driver. The controller follows CMSIS-DAP
reference implementation. It expects a request buffer from the host
interface, splits it to simple transfers and forwards to the DP driver,
and finally returns a response buffer to the host.
Interface to the host can be implemented with USB HID device support.
Controller implements only SW-DP support and is tested
with pyOCD and ADIv5.x.
Signed-off-by: Johann Fischer <j.fischer@phytec.de>
