SPI (Serial Peripheral Interface)

API

Includes

#include "spi.ceu"

Code Abstractions

SPI_Transaction

Sets up an SPI transaction with the given parameters.

code/await SPI_Transaction (var u32 freq, var u8 bit_order, var u8 mode, var int? cs, var int? csn) -> NEVER;

Parameters:

• u32: transmission frequency
• u8: byte order (SPI_LSBFIRST, SPI_MSBFIRST)
• u8: mode of operation (SPI_MODE0, SPI_MODE1, SPI_MODE2, SPI_MODE3)
• int?: chip select cs pin (active high)
• int?: chip select csn pin (active low)

The chip select pins are optional, but at most one may be set.

Return:

• NEVER: never returns

SPI transactions cannot be concurrent and must be serialized accordingly.

SPI_Transfer

Transmits and receives a vector of bytes.

code/await SPI_Transfer (var&[] byte buf) -> none;

Parameters:

• &[] byte: reference to single buffer to transfer and receive in place

Return:

• none

Transfers must be always enclosed in transactions.

SPI_Transfer_8

Transmits and receives a byte.

code/await SPI_Transfer_8 (var byte? v) -> byte;

Parameters:

• byte?: value to transmit to the peripheral (default: don't care)

Return:

• byte: value received from the peripheral

Transfers must be always enclosed in transactions.

Examples

TODO