.. zephyr:code-sample:: cmsis-dap
:name: CMSIS-DAP
Implement a custom CMSIS-DAP controller using SWDP interface driver.
Overview
********
This sample app demonstrates use of a SWDP interface driver and CMSIS DAP
controller through USB Bulk interface.
Requirements
************
This sample supports multiple hardware configurations:
The simplest configuration would be to connect `SWDIO` to `dio`, `SWDCLK` to `clk`
and optionally `nRESET` to `reset`. The optional `noe` pin is used to enable the port,
e.g. if the SWD connections are multiplexed.
Building and Running
********************
In order for our debug adapter to be recognized by pyOCD we need to change
Zephyr's VID/PID to IDs known to pyOCD, this is up to the user.
The following commands build and flash DAP sample.
.. zephyr-app-commands::
:zephyr-app: samples/subsys/dap
:board: nrf52840dk_nrf52840
:goals: flash
:compact:
Connect HIC to the target and try some pyOCD commands, for example:
.. code-block:: console
pyocd commander -t nrf52840
0029527 W Board ID FE5D is not recognized [mbed_board]
Connected to NRF52840 [Sleeping]: FE5D244DFE1F33DB
pyocd> read32 0x20004f18 32
20004f18: 20001160 2000244c 00000000 0000e407 | ..` .$L........|
20004f28: ffffffff ffffffff 00000000 aaaaaaaa |................|
pyocd> halt
Successfully halted device
pyocd> reg
general registers:
lr: 0x00009cdd r7: 0x00000000 (0)
pc: 0x000033ca r8: 0x00000000 (0)
r0: 0x00000000 (0) r9: 0x00000000 (0)
r1: 0x20002854 (536881236) r10: 0x00000000 (0)
r2: 0x20000be4 (536873956) r11: 0x00000000 (0)
r3: 0x00000000 (0) r12: 0x00000000 (0)
r4: 0x200017e8 (536877032) sp: 0x20002898
r5: 0x20001867 (536877159) xpsr: 0x61000000 (1627389952)
r6: 0x00000000 (0)
159f7dbbb1