TMiletusRaspberrySPI
The SPI protocol (Serial peripheral interface) uses a 3-wire connection, a clock and the data-in and data-out signal. Other than this, it is similar to I²C, meaning, it also uses an address and reads and writes data serialized over this 2 data wires. Below is a list of available properties, methods and events for TMiletusRaspberrySPI.
Properties for TMiletusRaspberrySPI
| Property |
Description |
| PortNum: TMiletusRaspiSPIPortNum |
Select the SPI port. Possible values are spi0 and spi1 |
Methods for TMiletusRaspberrySPI
| Method |
Description |
| Open |
Open the connection |
| Close |
Close the connection |
| ReadTransfer(var ABuffer: TBytes; AWSize, ARSize: Integer) |
Read a buffer of data |
| WriteTransfer(ABuffer: TBytes; AWSize: Integer) |
Write a buffer of data |
| WriteTransfer(ACommand: SmallInt; ABuffer: TBytes; ADCPin: Integer = -1; ACSPin: Integer = -1) |
Write ACommand followed by ABuffer. If ADCPin and/or ACSPin is defined, the corresponding GPIO pin(s) will change to low/high: DC low -> CS low -> ACommand -> CS high -> DC high -> CS low -> ABuffer -> CS high. |
| WriteMemBuffer |
Write all data from TMiletusRaspberryMemoryBuffer through SPI. |
Events for TMiletusRaspberrySPI
| Event |
Description |
| OnOpen |
Event triggered when the connection is opened |
| OnClose |
Event triggered when the connection is closed |