FTDI LibFT4222 - Figure 3.10 Slave Sends Transfer Request (no ACK); Figure 3.8 Slave Sends Transfer Request; Figure 3.9 SPI Master Transfer Request (no ACK); SPI Slave Init

Application Note
AN_329 User Guide For LibFT4222
Version 1.5
Document Reference No.: FT_001060 Clearance No.: FTDI#406
36
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The encapsulation of header is done by support-lib.
Figure 3.8 Slave sends transfer request
 SPI_SLAVE_NO_ACK
This option is to reduce the complication of SPI_SLAVE_WITH PROTOCOL.
It removes the ACK response from the Slave.
Figure 3.9 SPI Master Transfer Request (NO ACK)
Figure 3.10 Slave sends transfer request (NO ACK)
 SPI_SLAVE_NO_PROTOCOL
This option provides no protocol for SPI Slave function, and it is configured and initialized with the
API FT4222_SPISlave_InitEx.
In this SPI Slave operational mode, the Sync Word “0x5A” is not inserted. And there is no
additional process in support-lib.
Users can design own protocol(s) to communicate with a SPI master.
3.4.1 SPI Slave Init
FT4222_STATUS FT4222_SPISlave_Init(FT_HANDLE ftHandle)