SPI Delays
Sometimes slave devices need additional time to process data. In order to provide this time, DLN-series adapters can insert delays at different data transmission stages:
Delay between data frames;
Delay after slave selection;
Delay between slave selections.
All of the delays are set in nanoseconds (ns) and are configured only once. The defined delay values are the same for all SS lines of the port.
Delay between data frames
In case a slave device is not fast enough to process continuously incoming data, you can configure the DLN adapter to insert delays between each two consecutive frames. This gives the slave device additional time to process the data from the previous frame. Once enabled, the delay is inserted after each frame.
The default value of the delay between frames is 0ns. The delay value is adjusted using the DlnSpiMasterSetDelayBetweenFrames() function. The current delay between frames value can be retrieved by calling the DlnSpiMasterGetDelayBetweenFrames() function.
Delay after slave selection
When an SPI slave device needs additional time for initialization, you can configure delay after slave selection (SS). When enabled, the delay is introduces after SS line assertion and before transmission of the first data bit.
The default value of the delay after slave selection is 0ns. To adjust the delay value, use the DlnSpiMasterSetDelayAfterSS() function. To retrieve the current delay value, call the DlnSpiMasterGetDelayAfterSS() function.
Delay between slave selections
Delay between slave selections is inserted after one SS line release and before assertion of another SS line.
The default value of the delay between slave selections is 62ns. The delay value is adjusted using the DlnSpiMasterSetDelayBetweenSS() function, and can be retrieved using the DlnSpiMasterGetDelayBetweenSS() function.