13.3.5.5 Data packet
The data packet carries just the data, either host sending data to target, or target sending
data to host. The data transfer direction is determined by the last command sent from the
host. The data packet is also wrapped within a framing packet, to ensure the correct
packet data is received.
The contents of a data packet are simply the data itself. There are no other fields, so that
the most data per packet can be transferred. Framing packets are responsible for ensuring
that the correct packet data is received.
13.3.5.6 Response packet
The responses are carried using the same command packet format wrapped with framing
packet data. Types of responses include:
• GenericResponse
• GetPropertyResponse
• ReadMemoryResponse
• FlashReadOnceResponse
• FlashReadResourceResponse
GenericResponse: After the Kinetis Flashloader has processed a command, the
flashloader will send a generic response with status and command tag information to the
host. The generic response is the last packet in the command protocol sequence. The
generic response packet contains the framing packet data and the command packet data
(with generic response tag = 0xA0) and a list of parameters (defined in the next section).
The parameter count field in the header is always set to 2, for status code and command
tag parameters.
Table 13-12. GenericResponse Parameters
Byte # Parameter Descripton
0 - 3 Status code The Status codes are errors encountered during the execution of a
command by the target (Kinetis Flashloader). If a command succeeds,
then a kStatus_Success code is returned. Table 13-47, Kinetis
Flashloader Status Error Codes, lists the status codes returned to the host
by the Kinetis Flashloader.
4 - 7 Command tag The Command tag parameter identifies the response to the command sent
by the host.
Functional Description
K22F Sub-Family Reference Manual, Rev. 4, 08/2016
306 NXP Semiconductors
To Next Page
Loading...
