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RF69_avr.h
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RF69_avr.h
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#include <avr/interrupt.h>
#include <util/crc16.h>
// prog_uint8_t appears to be deprecated in avr libc, this resolves it for now
#define __PROG_TYPES_COMPAT__
#include <avr/pgmspace.h>
#define ROM_UINT8 const prog_uint8_t
#define ROM_READ_UINT8 pgm_read_byte
#define ROM_DATA PROGMEM
#define IRQ_ENABLE sei()
#if defined(__AVR_ATmega2560__) || defined(__AVR_ATmega1280__)
#define RFM_IRQ 2
#define SS_DDR DDRB
#define SS_PORT PORTB
#define SS_BIT 0
#define SPI_SS 53 // PB0, pin 19
#define SPI_MOSI 51 // PB2, pin 21
#define SPI_MISO 50 // PB3, pin 22
#define SPI_SCK 52 // PB1, pin 20
static void spiConfigPins () {
SS_PORT |= _BV(SS_BIT);
SS_DDR |= _BV(SS_BIT);
PORTB |= _BV(SPI_SS);
DDRB |= _BV(SPI_SS) | _BV(SPI_MOSI) | _BV(SPI_SCK);
}
#elif defined(__AVR_ATmega644P__)
#define RFM_IRQ 10
#define SS_DDR DDRB
#define SS_PORT PORTB
#define SS_BIT 4
#define SPI_SS 4
#define SPI_MOSI 5
#define SPI_MISO 6
#define SPI_SCK 7
static void spiConfigPins () {
SS_PORT |= _BV(SS_BIT);
SS_DDR |= _BV(SS_BIT);
PORTB |= _BV(SPI_SS);
DDRB |= _BV(SPI_SS) | _BV(SPI_MOSI) | _BV(SPI_SCK);
}
#elif defined(__AVR_ATtiny84__) || defined(__AVR_ATtiny44__)
#define RFM_IRQ 2
#define SS_DDR DDRB
#define SS_PORT PORTB
#define SS_BIT 1
#define SPI_SS 1 // PB1, pin 3
#define SPI_MISO 6 // PA6, pin 7
#define SPI_MOSI 5 // PA5, pin 8
#define SPI_SCK 4 // PA4, pin 9
static void spiConfigPins () {
SS_PORT |= _BV(SS_BIT);
SS_DDR |= _BV(SS_BIT);
PORTB |= _BV(SPI_SS);
DDRB |= _BV(SPI_SS);
PORTA |= _BV(SPI_SS);
DDRA |= _BV(SPI_MOSI) | _BV(SPI_SCK);
}
#elif defined(__AVR_ATmega32U4__) //Arduino Leonardo
#define RFM_IRQ 0 // PD0, INT0, Digital3
#define SS_DDR DDRB
#define SS_PORT PORTB
#define SS_BIT 6 // Dig10, PB6
#define SPI_SS 10 // PB6, pin 30, Digital10
#define SPI_MISO 14 // PB3, pin 11, Digital14
#define SPI_MOSI 16 // PB2, pin 10, Digital16
#define SPI_SCK 15 // PB1, pin 9, Digital15
static void spiConfigPins () {
SS_PORT |= _BV(SS_BIT);
SS_DDR |= _BV(SS_BIT);
PORTB |= _BV(SPI_SS);
DDRB |= _BV(SPI_SS) | _BV(SPI_MOSI) | _BV(SPI_SCK);
}
#elif defined(__AVR_ATmega1284P__) //Moteino mega
#define SS_DDR DDRB
#define SS_PORT PORTB
#define SS_BIT 4 // PB4 D4
#define SPI_SS 4 // PB4 D4
#define SPI_MOSI 5 // PB5 D5
#define SPI_MISO 6 // PB6 D6
#define SPI_SCK 7 // PB7 D7
static void spiConfigPins () {
SS_PORT |= _BV(SS_BIT);
SS_DDR |= _BV(SS_BIT);
PORTB |= _BV(SPI_SS);
DDRB |= _BV(SPI_SS) | _BV(SPI_MOSI) | _BV(SPI_SCK);
}
#else // ATmega168, ATmega328, etc.
// #define RFM_IRQ 2
#define SS_DDR DDRB
#define SS_PORT PORTB
#define SS_BIT 2 // for PORTB: 2 = d.10, 1 = d.9, 0 = d.8
#define SPI_SS 2 // PB0
#define SPI_MOSI 3 // PB1
#define SPI_MISO 4 // PB2
#define SPI_SCK 5 // PB3
static void spiConfigPins () {
SS_PORT |= _BV(SS_BIT);
SS_DDR |= _BV(SS_BIT);
PORTB |= _BV(SPI_SS);
DDRB |= _BV(SPI_SS) | _BV(SPI_MOSI) | _BV(SPI_SCK);
}
#endif
#ifndef EIMSK
#define EIMSK GIMSK // ATtiny
#endif
struct PreventInterrupt {
#if defined(__AVR_ATmega2560__) || defined(__AVR_ATmega1280__)
PreventInterrupt () { EIMSK &= ~ _BV(INT0 << 4); }
~PreventInterrupt () { EIMSK |= _BV(INT0 << 4); }
#else
PreventInterrupt () { EIMSK &= ~ _BV(INT0); }
~PreventInterrupt () { EIMSK |= _BV(INT0); }
#endif
};
static void spiInit (void) {
spiConfigPins();
#ifdef SPCR
SPCR = _BV(SPE) | _BV(MSTR);
SPSR |= _BV(SPI2X);
#else
USICR = _BV(USIWM0); // ATtiny
#endif
// pinMode(RFM_IRQ, INPUT);
// digitalWrite(RFM_IRQ, 1); // pull-up
}
static uint8_t spiTransferByte (uint8_t out) {
#ifdef SPDR
SPDR = out;
while (!(SPSR & _BV(SPIF)))
;
return SPDR;
#else
USIDR = out; // ATtiny
uint8_t v1 = _BV(USIWM0) | _BV(USITC);
uint8_t v2 = _BV(USIWM0) | _BV(USITC) | _BV(USICLK);
for (uint8_t i = 0; i < 8; ++i) {
USICR = v1;
USICR = v2;
}
return USIDR;
#endif
}
static uint8_t spiTransfer (uint8_t cmd, uint8_t val) {
SS_PORT &= ~ _BV(SS_BIT);
spiTransferByte(cmd);
uint8_t in = spiTransferByte(val);
SS_PORT |= _BV(SS_BIT);
return in;
}