59 lines
952 B
C++
59 lines
952 B
C++
|
/*
|
||
|
|
* spiFpga
|
||
|
|
* Copyright (C) 2012 by Florent Kermarrec <florent@enjoy-digital.fr>
|
||
|
|
* Copyright (C) 2011 by James Bowman <jamesb@excamera.com>
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "WProgram.h"
|
||
|
|
#include <avr/pgmspace.h>
|
||
|
|
#include <SPI.h>
|
||
|
|
#include <spiFpga.h>
|
||
|
|
|
||
|
|
SFClass SF;
|
||
|
|
|
||
|
|
void SFClass::begin()
|
||
|
|
{
|
||
|
|
pinMode(SS_PIN, OUTPUT);
|
||
|
|
SPI.begin();
|
||
|
|
SPI.setClockDivider(SPI_CLOCK_DIV2);
|
||
|
|
SPI.setBitOrder(MSBFIRST);
|
||
|
|
SPI.setDataMode(SPI_MODE0);
|
||
|
|
SPSR = (1 << SPI2X);
|
||
|
|
digitalWrite(SS_PIN, HIGH);
|
||
|
|
}
|
||
|
|
|
||
|
|
void SFClass::end() {
|
||
|
|
}
|
||
|
|
|
||
|
|
void SFClass::__start(unsigned int addr)
|
||
|
|
{
|
||
|
|
digitalWrite(SS_PIN, LOW);
|
||
|
|
SPI.transfer(highByte(addr));
|
||
|
|
SPI.transfer(lowByte(addr));
|
||
|
|
}
|
||
|
|
|
||
|
|
void SFClass::__wstart(unsigned int addr)
|
||
|
|
{
|
||
|
|
__start(0x8000|addr);
|
||
|
|
}
|
||
|
|
|
||
|
|
void SFClass::__end()
|
||
|
|
{
|
||
|
|
digitalWrite(SS_PIN, HIGH);
|
||
|
|
}
|
||
|
|
|
||
|
|
char SFClass::rd(unsigned int addr)
|
||
|
|
{
|
||
|
|
__start(addr);
|
||
|
|
char r = SPI.transfer(0);
|
||
|
|
__end();
|
||
|
|
return r;
|
||
|
|
}
|
||
|
|
|
||
|
|
void SFClass::wr(unsigned int addr, char v)
|
||
|
|
{
|
||
|
|
__wstart(addr);
|
||
|
|
SPI.transfer(v);
|
||
|
|
__end();
|
||
|
|
}
|