Commit 0f422f53 authored by Daniel Friesel's avatar Daniel Friesel
Browse files

add untested Arduino Nano SPI driver

parent 664c1b6c

include/arch/arduino-nano/driver/spi.h

0 → 100644
+18 −0
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#ifndef SPI_H

#define SPI_H



class SPI {

	private:

		SPI(const SPI &copy);



	public:

		SPI () {}

		signed char setup();

		signed char xmit(

				unsigned char tx_len, unsigned char *tx_buf,

				unsigned char rx_len, unsigned char *rx_buf);

};



extern SPI spi;



#endif

src/arch/arduino-nano-168/Makefile.inc

+4 −0
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@@ -37,6 +37,10 @@ else ifneq ($(findstring i2c,${arch_drivers}), ) 
	CXX_TARGETS += src/arch/arduino-nano/driver/i2c.cc

endif



ifneq ($(findstring spi,${arch_drivers}), )

	CXX_TARGETS += src/arch/arduino-nano/driver/spi.cc

endif



ifneq ($(findstring stdin,${arch_drivers}), )

	CXX_TARGETS += src/arch/arduino-nano/driver/stdin.cc

endif

src/arch/arduino-nano/Makefile.inc

+4 −0
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@@ -37,6 +37,10 @@ else ifneq ($(findstring i2c,${arch_drivers}), ) 
	CXX_TARGETS += src/arch/arduino-nano/driver/i2c.cc

endif



ifneq ($(findstring spi,${arch_drivers}), )

	CXX_TARGETS += src/arch/arduino-nano/driver/spi.cc

endif



ifneq ($(findstring stdin,${arch_drivers}), )

	CXX_TARGETS += src/arch/arduino-nano/driver/stdin.cc

endif

src/arch/arduino-nano/arch.cc

+6 −2
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@@ -105,12 +105,16 @@ void Arch::idle(void) 


void Arch::delay_us(unsigned int const us)

{

	_delay_us(us);

	for (unsigned int i = 0; i < us; i++) {

		_delay_us(1);

	}

}



void Arch::delay_ms(unsigned int const ms)

{

	_delay_ms(ms);

	for (unsigned int i = 0; i < ms; i++) {

		_delay_ms(1);

	}

}



Arch arch;

src/arch/arduino-nano/driver/spi.cc

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#include "driver/spi.h"

#include "driver/gpio.h"

#include "arch.h"

#include <avr/io.h>



signed char SPI::setup()

{

	// configure SS as output to avoid unintened switches to slave mode

	gpio.output(GPIO::pb2, 0);

	// up to 1 MHz SPI clock

#if F_CPU == 16000000UL

	SPCR = _BV(SPE) | _BV(MSTR) | _BV(SPR0);

#elif F_CPU == 8000000UL

	SPCR = _BV(SPE) | _BV(MSTR) | _BV(SPR0);

#else

	SPCR = _BV(SPE) | _BV(MSTR);

#endif

}



signed char SPI::xmit(

		unsigned char tx_len, unsigned char *tx_buf,

		unsigned char rx_len, unsigned char *rx_buf)

{

	unsigned char i;



	while ((i < tx_len) || (i < rx_len)) {

		if (i < tx_len) {

			SPDR = tx_buf[i];

		} else {

			SPDR = 0;

		}

		while (!(SPSR & _BV(SPIF))) ;

		if (i < rx_len) {

			rx_buf[i] = SPDR;

		}

		i++;

	}

	return 0;

}



SPI spi;