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#include <avr/io.h>
#include "rfm.h"
#define SS_PIN PB2
#define SS_DDR DDRB
#define SS_PORT PORTB
#define SCK_PIN PB5
#define MOSI_PIN PB3
#define MISO_PIN PB4
#define SPI_DDR DDRB
#define READ_MASK 0x7F
#define WRITE_MASK 0x80
static inline void spi_init(void)
{
SS_DDR |= (1 << SS_PIN);
SS_PORT |= (1 << SS_PIN);
SPI_DDR = (1 << MOSI_PIN) | (1 << SCK_PIN);
SPCR = (1 << SPE) | (1 << MSTR) | (1 << SPR0);
}
static inline uint8_t spi_read(uint8_t addr)
{
SS_PORT |= (1 << SS_PIN);
SPDR = addr;
while (!(SPSR & (1 << SPIF)))
;
addr = SPDR;
SS_PORT &= ~(1 << SS_PIN);
return addr;
}
static inline void spi_write(uint8_t addr, uint8_t data)
{
SS_PORT |= (1 << SS_PIN);
SPDR = addr;
while (!(SPSR & (1 << SPIF)))
;
SPDR = data;
while (!(SPSR & (1 << SPIF)))
;
SS_PORT &= ~(1 << SS_PIN);
}
static inline void send_cmd(uint8_t addr, uint8_t val)
{
uint8_t ra, wa;
ra = addr | READ_MASK;
wa = addr | WRITE_MASK;
while (spi_read(ra) != val)
spi_write(wa, val);
}
void rfm_init(uint8_t addr)
{
spi_init();
// mode: standby + packet
send_cmd(0x01, 0x44);
// rx interrupt on DPIO0
send_cmd(0x25, 0x40);
send_cmd(0x26, 0x07);
// packet format: 8 bits + whitening + crc + addr filtering
send_cmd(0x37, 0x52);
send_cmd(0x38, 0x08);
send_cmd(0x38, addr);
// disable encryption
send_cmd(0x3D, 0x02);
}
void rfm_send(uint8_t addr, uint8_t data)
{
}
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