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46 lines
675 B
C
46 lines
675 B
C
#include <stdint.h>
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#include <avr/io.h>
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#include "board.h"
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#include "spi.h"
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void spi_begin(void)
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{
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CLR(nSS);
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}
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uint8_t spi_io(uint8_t v)
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{
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// while (!(UCSR1A & 1 << UDRE1));
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UDR1 = v;
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while (!(UCSR1A & 1 << RXC1));
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return UDR1;
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}
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void spi_end(void)
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{
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// while (!(UCSR1A & 1 << TXC1));
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SET(nSS);
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}
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void spi_init(void)
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{
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SET(nSS);
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OUT(SCLK);
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OUT(MOSI);
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OUT(nSS);
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IN(MISO);
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UBRR1 = 0; /* set bit rate to zero to begin */
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UCSR1C = 1 << UMSEL11 | 1 << UMSEL10;
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/* set MSPI, MSB first, SPI data mode 0 */
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UCSR1B = 1 << RXEN1 | 1 << TXEN1;
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/* enable receiver and transmitter */
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UBRR1 = 0; /* reconfirm the bit rate */
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}
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