DAP_Info

Get Information about CMSIS-DAP Debug Unit.

The DAP_Info Command provides configuration information about the Debug Unit itself and the capabilities.

DAP_Info Command:

| BYTE | BYTE |
> 0x00 | ID   |
|******|******|

• ID: Request Identifier to obtain information in the Response:
  • 0x01 = Get the Vendor Name (string).
  • 0x02 = Get the Product Name (string).
  • 0x03 = Get the Serial Number (string).
  • 0x04 = Get the CMSIS-DAP Protocol Version (string).
  • 0x05 = Get the Target Device Vendor (string).
  • 0x06 = Get the Target Device Name (string).
  • 0x07 = Get the Target Board Vendor (string).
  • 0x08 = Get the Target Board Name (string).
  • 0x09 = Get the Product Firmware Version (string, vendor-specific format).
  • 0xF0 = Get information about the Capabilities (BYTE) of the Debug Unit (see below for details).
  • 0xF1 = Get the Test Domain Timer parameter information (see below for details).
  • 0xFB = Get the UART Receive Buffer Size (WORD).
  • 0xFC = Get the UART Transmit Buffer Size (WORD).
  • 0xFD = Get the SWO Trace Buffer Size (WORD).
  • 0xFE = Get the maximum Packet Count (BYTE).
  • 0xFF = Get the maximum Packet Size (SHORT).

DAP_Info Response:

| BYTE | BYTE | BYTE |
< 0x00 | Len  | Info |
|******|******|++++++|

• Len: Info length in bytes.
• Info:
  • a string encoded as UTF-8. Len is the string length including the \x00 terminator. Len = 0 indicates no information, and is distinct from an empty string indicated by Len = 1.
  • a BYTE value (indicated with Len = 1).
  • a SHORT value (indicated with Len = 2).
  • a WORD value (indicated with Len = 4).

Note

An unrecognized ID returns no value (indicated by Len = 0).

The ID for Vendor Name, Product Name, and Serial Number may return no string (indicated by Len = 0). In this case the USB Device Information is used to obtain Vendor Name, Product Name, and Serial Number.

The value of CMSIS-DAP Protocol Version must be one of the versions from the CMSIS-DAP revision history, such as "2.1.0".

Target Device Vendor, Target Device Name, Target Board Vendor and Target Board Name are only available on On-Board Debug Units with known Target. Refer to TARGET_FIXED for more information. Strings should match the listed attribute values from the corresponding CMSIS Board Support Pack. If the Target is not known no string is returned (indicated by Len = 0).

Target Device Vendor should match the Dvendor attribute value (excluding the colon and vendor code suffix when present) of the mountedDevice.

Target Device Name should match the Dname attribute value of the mountedDevice.

Target Board Vendor should match the vendor attribute value (excluding the colon and vendor code suffix when present).

Target Board Name should match the name attribute value.

Product Firmware Version may return no string (indicated by Len = 0).

---

DAP_Info Response (for ID=0xF0):

The ID=0xF0 Capabilities obtains information about the available interface to the Device. The reply consists of one or two Info bytes with bits that indicate the features of the Debug Unit. The features indicate the command scope of the CMSIS-DAP firmware. If certain features are not available, the debugger should not call the related commands as the may not be implemented. Commands that are not implemented reply with 0xFF instead of repeating the command byte.

| BYTE | BYTE | BYTE *| BYTE  |
< 0x00 | Len  | Info0 | Info1 |
|******|******|*******|*******|

• Len: 1 = Info0 present, 2 = Info0, Info1 present.

Available transfer protocols to target:

• Info0 - Bit 0: 1 = SWD Serial Wire Debug communication is implemented (0 = SWD Commands not implemented).
• Info0 - Bit 1: 1 = JTAG communication is implemented (0 = JTAG Commands not implemented).

Serial Wire Trace (SWO) support:

• Info0 - Bit 2: 1 = SWO UART - UART Serial Wire Output is implemented (0 = not implemented).
• Info0 - Bit 3: 1 = SWO Manchester - Manchester Serial Wire Output is implemented (0 = not implemented).

Command extensions for transfer protocol:

• Info0 - Bit 4: 1 = Atomic Commands - Atomic Commands support is implemented (0 = Atomic Commands not implemented).

Time synchronisation via Test Domain Timer:

• Info0 - Bit 5: 1 = Test Domain Timer - debug unit support for Test Domain Timer is implemented (0 = not implemented).

SWO Streaming Trace support:

• Info0 - Bit 6: 1 = SWO Streaming Trace is implemented (0 = not implemented).

UART Communication Port support:

• Info0 - Bit 7: 1 = UART Communication Port is implemented (0 = not implemented).

UART Communication via USB COM Port support:

• Info1 - Bit 0: 1 = USB COM Port is implemented (0 = not implemented).

---

DAP_Info Response (for ID=0xF1):

The ID=0xF1 Test Domain Timer obtains the parameter information about an optional 32-bit Test Domain Timer that may be used for various time measurements.

| BYTE | BYTE | WORD *****|
< 0x00 | 0x08 | Frequency |
|******|******|***********|

• Frequency: Input frequency of the Test Domain Timer which indicates the resolution of the 32-bit TD_TimeStamp values.