/*
* Initialises the max3421e host shield. Initialises the SPI bus and sets the required pin directions.
* Must be called before powerOn.
*/
void max3421e_init()
{
spi_begin();
#if defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
// Set MAX_INT and MAX_GPX pins to input mode.
DDRH &= ~(0x40 | 0x20);
// Set SPI !SS pint to output mode.
DDRB |= 0x10;
// Set RESET pin to output
DDRH |= 0x10;
#elif defined(__AVR_ATmega168__) || defined(__AVR_ATmega328P__)
// Set MAX_INT and MAX_GPX pins to input mode.
DDRB &= ~0x3;
// Set RESET pin to output
DDRD |= 0x80;
// Set SS pin to output
DDRB |= 0x4;
#endif
// Sparkfun botched their first attempt at cloning Oleg's max3421e shield and reversed the GPX and RESET pins.
// This hack is in place to make MicroBridge work with those shields. (see http://www.sparkfun.com/products/9628)
#ifdef SFHACK
#if defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
// Set MAX_GPX pin to input mode.
DDRH &= ~0x10;
// Set RESET pin to output
DDRH |= 0x20;
#elif defined(__AVR_ATmega168__) || defined(__AVR_ATmega328P__)
// Set GPX pin to input
DDRD &= ~0x80;
// Set RESET pin to output
DDRB |= 0x1;
#endif
#endif
// Pull SPI !SS high
MAX_SS(1);
// Reset
MAX_RESET(1);
}
/*
* Initialises the max3421e host shield. Initialises the SPI bus and sets the required pin directions.
* Must be called before powerOn.
*/
void max3421e_init()
{
SPI.begin();
#ifndef __AVR_ATmega2560__
pinMode(PIN_MAX_INT, INPUT);
pinMode(PIN_MAX_GPX, INPUT);
pinMode(PIN_MAX_SS, OUTPUT);
pinMode(PIN_MAX_RESET, OUTPUT);
#endif
#ifdef __AVR_ATmega2560__
pinMode(PIN_MAX_SS, OUTPUT);
DDRE &= ~ 0x40; // MAX_INT as input
DDRJ &= ~ 0x08; //MAX_GPX as input
DDRJ |= 0x04; //MAX_RESET as output
#endif
/*
#if defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
// Set MAX_INT and MAX_GPX pins to input mode.
DDRH &= ~(0x40 | 0x20);
// Set SPI !SS pint to output mode.
DDRB |= 0x10;
// Set RESET pin to output
DDRH |= 0x10;
#elif defined(__AVR_ATmega168__) || defined(__AVR_ATmega328P__)
// Set MAX_INT and MAX_GPX pins to input mode.
DDRB &= ~0x3;
// Set RESET pin to output
DDRD |= 0x80;
// Set SS pin to output
DDRB |= 0x4;
#endif
*/
// Pull SPI !SS high
MAX_SS(1);
// Reset
MAX_RESET(1);
}