40 lines
805 B
C++
40 lines
805 B
C++
#include "spi.h"
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SPI::SPI(void)
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{
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}
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void SPI::init(void) const volatile
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{
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// Konfiguriere SPI DDRs
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DDRB |= _BV(SLSL) | _BV(MOSI) | _BV(SCLK);
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DDRB &= ~_BV(MISO);
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// Konfiguriere DMUX DDRs
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DDRD |= _BV(DMUX1) | _BV(DMUX2) | _BV(DMUX3);
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// aktiviere SPI, Master Modus, SPI Modus 0
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// F_SPI = F_CPU / 2 (prescaler 2)
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SPCR = _BV(SPE) | _BV(MSTR);
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SPSR = _BV(SPI2X);
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// waehle keinen SPI Slave aus
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setAdr(SPIADR::NONE);
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}
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void SPI::setAdr(uint8_t adr) const volatile
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{
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PORTD &= ~(_BV(DMUX1) | _BV(DMUX2) | _BV(DMUX3));
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PORTD |= (adr & 0x01) ? _BV(DMUX1) : 0;
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PORTD |= (adr & 0x02) ? _BV(DMUX2) : 0;
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PORTD |= (adr & 0x04) ? _BV(DMUX3) : 0;
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}
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uint8_t SPI::pushByte(uint8_t b) const volatile
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{
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SPDR = b;
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while(!(SPSR & _BV(SPIF)));
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return SPDR;
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}
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