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#include <stdlib.h>
#include <avr/io.h>
#include <util/delay.h>
#include "radio.h"
#include "serial.h"
#define SPI_SS PB2
#define SPI_SCK PB5
#define SPI_MISO PB4
#define SPI_MOSI PB3
#define SPI_DDR DDRB
#define SPI_PORT PORTB
#define RF69_OPMODE_RX 0x10
#define RF69_OPMODE_TX 0x0C
#define RF69_OPMODE_STDBY 0x04
#define RF69_REG_OPMODE 0x01
#define RF69_REG_PALEVEL 0x11
#define RF69_REG_TESTPA1 0x5A
#define RF69_REG_TESTPA2 0x5C
#define RF69_REG_IRQFLAGS1 0x27
#define RF69_PALEVEL_PA1 0x40
#define RF69_PALEVEL_PA2 0x20
#define RF69_TESTPA1_BOOST 0x5D
#define RF69_TESTPA2_BOOST 0x7C
#define RF69_TESTPA1_NORMAL 0x55
#define RF69_TESTPA2_NORMAL 0x70
static int8_t power = 0;
static inline uint8_t read_reg(uint8_t reg)
{
SPI_PORT &= ~(1 << SPI_SS);
SPDR = reg & 0x7F;
while (!(SPSR & (1 << SPIF)))
;
SPDR = 0;
while (!(SPSR & (1 << SPIF)))
;
SPI_PORT |= (1 << SPI_SS);
return SPDR;
}
static inline void write_reg(uint8_t reg, uint8_t val)
{
SPI_PORT &= ~(1 << SPI_SS);
SPDR = reg | 0x80;
while (!(SPSR & (1 << SPIF)))
;
SPDR = val;
while (!(SPSR & (1 << SPIF)))
;
SPI_PORT |= (1 << SPI_SS);
}
static inline void set_mode(uint8_t mode)
{
static uint8_t prev_mode;
uint8_t opmode;
if (prev_mode != mode) {
if (mode == RF69_OPMODE_TX) {
if (power >= 18) {
write_reg(RF69_REG_TESTPA1, RF69_TESTPA1_BOOST);
write_reg(RF69_REG_TESTPA2, RF69_TESTPA2_BOOST);
}
} else {
if (power >= 18) {
write_reg(RF69_REG_TESTPA1, RF69_TESTPA1_NORMAL);
write_reg(RF69_REG_TESTPA2, RF69_TESTPA2_NORMAL);
}
}
opmode = read_reg(RF69_REG_OPMODE);
opmode &= ~0x1C;
opmode |= (mode & 0x1C);
write_reg(RF69_REG_OPMODE, opmode);
while (!(read_reg(RF69_REG_IRQFLAGS1) & 0x80))
;
prev_mode = mode;
}
}
void radio_set_tx_power(int8_t val)
{
uint8_t pa;
power = val;
if (power < -2)
power = -2;
if (power <= 13)
pa = (RF69_PALEVEL_PA1 | ((power + 18) & 0x1F));
else if (power >= 18)
pa = (RF69_PALEVEL_PA1 | RF69_PALEVEL_PA2 | ((power + 11) & 0x1F));
else
pa = (RF69_PALEVEL_PA1 | RF69_PALEVEL_PA2 | ((power + 14) & 0x1F));
write_reg(RF69_REG_PALEVEL, pa);
}
void radio_send(const char *data, uint8_t n)
{
uint8_t i;
set_mode(RF69_OPMODE_STDBY);
cli();
SPI_PORT &= ~(1 << SPI_SS);
SPDR = 0x00 | 0x80;
while (!(SPSR & (1 << SPIF)))
;
for (i = 0; i < n; i++) {
SPDR = data[i];
while (!(SPSR & (1 << SPIF)))
;
}
SPI_PORT |= (1 << SPI_SS);
sei();
set_mode(RF69_OPMODE_TX);
}
uint8_t radio_recv(char *buf, uint8_t n)
{
uint8_t read_len;
read_len = 0;
write_reg(0x01, 0x04);
while (!(read_reg(0x27) & 0x80))
;
SPI_PORT &= ~(1 << SPI_SS);
SPDR = 0x00 | 0x7F;
while (!(SPSR & (1 << SPIF)))
;
while (read_len < n) {
SPDR = 0;
while (!(SPSR & (1 << SPIF)))
;
buf[read_len++] = SPDR;
}
SPI_PORT |= (1 << SPI_SS);
return read_len;
}
void radio_listen(void)
{
write_reg(0x01, (read_reg(0x01) & 0xE3) | 0x10);
while (!(read_reg(0x27) & 0x80))
;
// todo: go to low power mode
}
void radio_init(const struct radio_cfg *cfg)
{
SPI_DDR |= (1 << SPI_SS) | (1 << SPI_SCK) | (1 << SPI_MOSI);
SPI_PORT |= (1 << SPI_SS);
SPCR |= (1 << SPE) | (1 << MSTR);
set_mode(RF69_OPMODE_STDBY);
// LNA, AFC and RXBW settings
write_reg(0x18, 0x88);
write_reg(0x19, 0x55);
write_reg(0x1A, 0x8B);
// DIO mappings: IRQ on DIO0
write_reg(0x25, 0x40);
write_reg(0x26, 0x07);
// RSSI threshold
write_reg(0x29, 0xE4);
// sync config
write_reg(0x2E, 0x80);
write_reg(0x2F, cfg->netid);
// packet config
write_reg(0x37, 0x10);
write_reg(0x38, cfg->payload_len);
write_reg(0x39, cfg->nodeid);
// fifo config
write_reg(0x3C, 0x8F);
// DAGC config
write_reg(0x6F, 0x30);
}
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