Class _usia_spimaster_swclk: software clocked SPI master over USI

A class _usia_spimaster_swclk object is an SPI master clocked by software implemented on top of the USI interface.

Clocking is handle by HWA when hw(write,...) is executed.

Note

This needs to be rewritten.

Actions

configure:

#define SPI          spimaster0_swclk
 
hw( configure, SPI );

read:

#define SPI          spimaster0_swclk
 
uint8_t byte = hw( read, SPI );

write: send one byte.

hw( write, spimaster0_swclk, 'A' );