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#include <usi_spi.h>
#include <mcu/mcu_def.h>
inline void usi_spi_init(enum spiMode mode) {
if (mode == USI_SPI_MODE_MASTER) {
// Set USCK and DO as output
DDR_USI |= _BV(DD_USCK) | _BV(DD_DO);
// Set DI pull up resistor
PORT_USI |= _BV(PORT_DI);
USICR |= _BV(USIWM0) | _BV(USICS1) | _BV(USICLK);
} else {
// Set DO as output
DDR_USI |= _BV(DD_DO);
// Set USCK and DI pull up resistor
PORT_USI |= _BV(PORT_USCK) | _BV(PORT_DI);
USICR |= _BV(USIWM0) | _BV(USICS1) | _BV(USIOIE);
}
}
inline int8_t usi_spi_busy(void) {
if (interface == SPI_INTERFACE_USI)
return USISR & 0x0F;
}
inline void usi_spi_join(void) {
while (spi_busy(interface));
}
inline uint8_t usi_spi_send(uint8_t data) {
while (spi_busy(interface));
return spi_transfer(interface, data);
}
inline uint8_t usi_spi_transfer(uint8_t data) {
// TODO rewrite and this for noninterupt
if (interface == SPI_INTERFACE_USI) {
_spi_usi_busy = 1;
USISR |= _BV(USIOIF);
USIDR = d;
do {
USICR |= _BV(USITC);
} while (!(USISR & _BV(USIOIF)));
return USIDR;
}
}
inline void usi_spi_expose(uint8_t data) {
if (interface == SPI_INTERFACE_USI)
USIDR = data;
}
////// Interrupts ////////////////////////////////
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