DLN_SPI_MASTER_SET_DELAY_AFTER_SS Command and Response

The DLN_SPI_MASTER_SET_DELAY_AFTER_SS command is used to set a delay duration between assertion of an SS line and first data frame.

DLN_SPI_MASTER_SET_DELAY_AFTER_SS Command

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 typedef struct
 {
    DLN_MSG_HEADER header;
    uint8_t port;
    uint32_t delayAfterSS;
 } __PACKED_ATTR DLN_SPI_MASTER_SET_DELAY_AFTER_SS_CMD;

Parameters:

header

Defines the DLN message header DLN_MSG_HEADER. The header contains several predefined fields and is used to identify and route messages. You must fill the following fields before sending the command:

Field	Description
size	The size of the message. Must be equal to the size of the DLN_SPI_MASTER_SET_DELAY_AFTER_SS_CMD structure.
msgId	Identifies the message. For the DLN_SPI_MASTER_SET_DELAY_AFTER_SS command it must be set to 0x0222. You can use the DLN_MSG_ID_SPI_MASTER_SET_DELAY_AFTER_SS constant.
echoCounter	Can be used to link a command to a response. The response will have the same echoCounter value. This field can be any numerical value from 0 to 0xFFFF (65536).
handle	A handle to the DLN-series adapter.

port

A number of the SPI master port to be configured.

delayAfterSS

The delay value in nanoseconds. In case a user specifies an unsupported value, it will be approximated as the closest lesser supported value. The DLN-series adapter will return the actual delay time in the response to this command.

In case a user sets a 0 ns delay, the actual delay will be equal to 1/2 of the clock frequency, specified using the DLN_SPI_MASTER_SET_FREQUENCY Command.

DLN_SPI_MASTER_SET_DELAY_AFTER_SS Response

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The adapter sends the DLN_SPI_MASTER_SET_DELAY_AFTER_SS response after the DLN_SPI_MASTER_SET_DELAY_AFTER_SS command execution. The result field informs a user if the delay between assertion of an SS line and first data transfer has been set successfully. The response also contains actual delay setting, in case a user has specified an incompatible value.

 typedef struct
 {
    DLN_MSG_HEADER header;
    DLN_RESULT result;
    uint32_t delayAfterSS;
 } __PACKED_ATTR DLN_SPI_MASTER_SET_DELAY_AFTER_SS_RSP;

Parameters:

header

Defines the DLN message header DLN_MSG_HEADER. The response header contains the following fields:

Field	Description
size	The size of the message. It is equal to the size of the DLN_SPI_MASTER_SET_DELAY_AFTER_SS_RSP structure.
msgId	Contains the message id. For the DLN_SPI_MASTER_SET_DELAY_AFTER_SS response it is set to 0x0222. The DLN_MSG_ID_SPI_MASTER_SET_DELAY_AFTER_SS constant can be used to check the message ID.
echoCounter	Links a command to a response. The echoCounter value is copied from the respective command header.
handle	A handle to the DLN-series adapter. You can use the handle field to determine the adapter that have sent the response.

result

Contains the result of the command execution. For DLN_SPI_MASTER_SET_DELAY_AFTER_SS command DLN-series adapter can return the following result values:

Return Code	Description
DLN_RES_SUCCESS	The delay setting has been successfully configured.

delayAfterSS

Actual set delay value in nanoseconds.

DLN_SPI_MASTER_SET_DELAY_AFTER_SS Command and Response