What is CMSIS-DAP?

CMSIS-DAP is an open source debug interface released by ARM. So far there are several ports of CMSIS-DAP available:

• CMSIS-DAP on Freescale's FRDM boards (KL05/KL25/K20/K64), by ARM/mbed, aka OpenSDA MK20 DAP
• CMSIS-DAP on NXP micro (LPC1768/LPC11U24/LPC11U35/LPC11U37), by ARM/mbed, aka LPC DAP
• CMSIS-DAP on STM micro (STM32F103C8/CB), by X893, aka F103 DAP

I revised F103 DAP with hardware modification to follow mikroBUS specification. As a result, the debugger platform CAN BE reused with mikroBUS shields. Its feature includes but does not limited to:

• simplejtag project for JTAG operation
• JTAG interface for FPGA/CPLD
• JTAG interface for legacy ARM7/9/11 (openOCD)
• Virtual instructments
• Wearable electronics
• AVR/Arduino ICSP port
• Microchip ICSP port
• Production programmer with converter socket
• maple/Arduino compatible application board

Why another CMSIS-DAP interface?

I have released an MK20 based CMSIS-DAP interface before. However, STM32F103 is very popular in ARM communities, so there are many open source hardware projects available for STM32 platform. So I modified the X893's design and meet demands from the market.

As a result, I have two CMSIS-DAP interfaces now. One for F103, the other for MK20, with same features but with different 3rd party open source projects running on them.

Features

• Driver-less USB HID connection
• Additional USB CDC virtual serial port connection
• Cortex Debug Access Port (DAP) command set
• Support ARM cortex-M0/M0+/M3/M4/M4F/A7 microcontrollers from different manufacturers.
• Support JTAG (Joint Test Action Group) and SWD (Serial Wire Debug) interfaces
• mikroBUS interface for expansion.
• Support main stream IDE including Keil uVision, IAR Workbench, CoIDE GCC

Verified Microcontrollers

We have verified the following microcontrollers with this CMSIS-DAP debugger for debugging and programming.

• STM32F103Cx (Cortex-M3)
• LPC1343 (Cortex-M3)
• LPC1114 (Cortex-M0)
• LPC812 (Cortex-M0+)
• MKL25Z128 (Cortex-M0+)
• MKL05Z64 (Cortex-M0+)
• MK20DX50 (Cortex-M4F)

Hardware Design

The hardware design in EAGLE 5.11.0 will be put on github.

USB mini cable and 100mil 10pin JTAG/SWD cable are included in the package.

The first batch of 10 boards are manually soldered. Keep tuned if you are expecting better soldered versions. It will not last long, since I will sent out some free boards to its original designer and my friends.

The SWD/JTAG pin header is 100mil (aka 2.54mm) pitch. If you want 50mil (1.27mm) pitch header, you can order a JTAGSWD converter from my store.

Known Limitation There is a fly wire around LDO due to a bug of EGALE. I had to manually fix it.

Firmware Design

The source and binary code, which is a branch of X893 master will be forked on github.

Technical Support

The project is an open source project. As a result, the user has to be aware of that they has to find technical support in communities and source code.

Additionally, the user should have Keil uVision Pro to build the source code into binary.

Open Source Projects

Other commercial tools such as JLINK from segger have powerful software suite to leaverage its JTAG probe. Now CMSIS-DAP has comparable software as well. Besides debugging in Keil/IAR/Eclipse/CoIDE，we can use open source projects like PyOCD to have GDB debug and scripting capabilities.

Due to limitation of license, pyOCD can not reveal its flash algorithm, but its team promises there will be a step by step tutorial to allow user to write its own algorithm. Keep tuned.

Additionally CoFlash also support CMSIS-DAP as an universial programmer for Cortex-M. You can add new micros algorithm for flash programming.