CMSIS-DAP  Version 1.00 - Beta
CMSIS-DAP Interface Firmware for CoreSight Debug Access Port
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DAP_JTAG_Transfer

Read/Write Single/Multiple Registers via JTAG. More...

Read/Write Single/Multiple Registers via JTAG.

Register access is a single 32-bit register Read or Write. Register address depends on the DPBANKSEL/APBANKSEL and A3..2. The command can execute several read/write operations on DP/AP registers. Response is in the same order as request but might be shorter in case of errors.

Transfer is aborted on the following errors:

Command to request the JTAG transfer.

BYTE | BYTE ******| BYTE **********| BYTE *************| WORD *********|
> 0x25 | JTAG Index | Transfer Count | Transfer Request | Transfer Data |
******|************|****************|+++++++++++++++++++|+++++++++++++++|

Respons to the JTAG dat transfer request.

BYTE | BYTE **********| BYTE *************| WORD *********|
< 0x25 | Transfer Count | Transfer Response | Transfer Data |
******|****************|*******************|+++++++++++++++|

Where