6.1.1 SPI_Config Command and its Response

The SPI_Config command (0x20) configures the SPI peripheral with the specified clock speed, SPI mode, chip-select and its active state, and the delays between chip-select assertion and the first data byte between the data bytes, and between the last data byte and de-assertion of the chip-select.

Note: An additional internal delay of approximately 6 μs (±2 μs) is always present, independent of the configured delay value. The total delay equals the configured Delay plus approximately 6 μs. This variance must be considered for timing-sensitive applications.

This command is sent through Endpoint 0x06 (OUT). The response is read through Endpoint 0x86 (IN).

Table 6-2. `SPI_Config` - Command
Byte Index	Command		Description
0	`0x20`	Command code	Configures the SPI module
1	`0x30` `0x20` `0x32` `0x22` `0x34` `0x24` `0x26`	Speed: 12 MHz 6 MHz 3 MHz 1.5 MHz 750 kHz 375 kHz 187.5 kHz	SPI clock speed
2	`0x44` `0x45` `0x46` `0x47`	Mode: 0 1 2 3	SPI mode
3	`0x00` `0x01` `0x40` `0x41` `0x80` `0x81` `0xC0` `0xC1`	CS-ActStat: CS0 active low CS0 active high CS1 active low CS1 aActive high CS2 active low CS2 active high CS3 active low CS3 active high	Chip-select and its assertion state
4-5	`0x0000` `0x000A` `0x0014` `…` `0x03E8` `…` `0x1388`	Delay: 0 μs 10 μs 20 μs ... 1000 μs ... 5000 μs	Delay between: Chip-select assertion and the first data byte Between each data byte The last data byte and chip-select de-assertion.

Table 6-3. `SPI_Config` - Response
Byte Index	Response		Description
0	`0x20`	Return command code	Returns whether the `SPI_Config` command code was accepted
1	`0x20`	Accepted - success	The command is accepted
	`0x60`	Rejected – wrong parameters	The command is rejected because the parameters are invalid
	`0x64`	Rejected – SPI is busy	The command is rejected because the SPI module is busy
	`0x6C`	Rejected – wrong CS pin	The command is rejected because the selected chip-select pin is not configured as a CS function. Configure the corresponding I/O pin as a chip-select pin and resend the command.