void USART_SPI::begin() {
UBRR(UCSRA) = 0; //Disable USART
volatile uint8_t* DDR = (volatile uint8_t*) pgm_read_word(UART_SCK_DDR + UART_module);
*DDR |= pgm_read_byte(UART_SCK_MASK + UART_module); //set XCK PIN mode to OUTPUT
UCSRC(UCSRA) = _BV(UMSEL01) | _BV(UMSEL00); //UCPHAn=0 UCPOLn=0 for mode0
UCSRB(UCSRA) = _BV(TXEN0) | _BV(RXEN0); //Enable USART
}
#define AVR_SD2_RX_VECT USART1_RX_vect
#define AVR_SD2_TX_VECT USART1_UDRE_vect
#else
#error "Cannot find USART to use for SD2"
#endif
#endif /* AVR_SERIAL_USE_USART1 */
/*===========================================================================*/
/* Driver local variables and types. */
/*===========================================================================*/
/**
* @brief Driver default configuration.
*/
static const SerialConfig default_config = {
UBRR(SERIAL_DEFAULT_BITRATE),
USART_CHAR_SIZE_8
};
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
static void set_error(uint8_t sra, SerialDriver *sdp) {
eventflags_t sts = 0;
uint8_t dor = 0;
uint8_t upe = 0;
uint8_t fe = 0;
#if AVR_SERIAL_USE_USART0
if (&SD1 == sdp) {
