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1.1 KiB
1.1 KiB
SPI master
- Can drive shift registers or communicate with any SPI based devices.
- Configurable speed, polarity and phase
- Up to 16 slave select signals
- Supports multicast (write to multiple slaves at once)
NOTE: To use Multicast with bi-directionally connected devices, the MISO pins should be connected through protection resistors to prevent a short circuit on signal collision.
Commands
QUERY (0)
Write and read some bytes.
The write and read sections can overlap if needed; some devices use this to report a status word while the command is being written. 0x00 is output on MOSI while collecting a response.
If the overlap is not desired (first write, then read), set the number of discarded bytes equal to the number of written bytes.
Request:
- u8 - slave number 0-16
- u16 - number of discarded MISO bytes before collecting the response
- u16 - response length (bytes)
- u8[] - bytes to write
Response:
- u8[] - received bytes
MULTICAST (1)
Request:
- u16 - slaves (packed)
- u8[] - bytes to write
Events
No events defined for this unit type.