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#include <stdlib.h>
#include <avr/io.h>
#include <util/delay.h>
#include "radio.h"
#include "uart.h"
#define SPI_DDR DDRB
#define SPI_PORT PORTB
#define SPI_SS_PIN PB2
#define SPI_SCK_PIN PB5
#define SPI_MISO_PIN PB4
#define SPI_MOSI_PIN PB3
#define NRF24_CE PB0
#define NRF24_CE_DDR DDRB
#define NRF24_CE_PORT DDRB
#define NRF24_POWER_ON_RST_DELAY 100
#define NRF24_REG_CONFIG 0x00
#define NRF24_REG_EN_AA 0x01
#define NRF24_REG_EN_RXADDR 0x02
#define NRF24_REG_SETUP_AW 0x03
#define NRF24_REG_SETUP_RETR 0x04
#define NRF24_REG_RF_CH 0x05
#define NRF24_REG_RF_SETUP 0x06
#define NRF24_REG_STATUS 0x07
#define NRF24_REG_OBSERVE_TX 0x08
#define NRF24_REG_RPD 0x09
#define NRF24_REG_RX_ADDR_P0 0x0A
#define NRF24_REG_RX_ADDR_P1 0x0B
#define NRF24_REG_RX_ADDR_P2 0x0C
#define NRF24_REG_RX_ADDR_P3 0x0D
#define NRF24_REG_RX_ADDR_P4 0x0E
#define NRF24_REG_RX_ADDR_P5 0x0F
#define NRF24_REG_TX_ADDR 0x10
#define NRF24_REG_RX_PW_P0 0x11
#define NRF24_REG_RX_PW_P1 0x12
#define NRF24_REG_RX_PW_P2 0x13
#define NRF24_REG_RX_PW_P3 0x14
#define NRF24_REG_RX_PW_P4 0x15
#define NRF24_REG_RX_PW_P5 0x16
#define NRF24_REG_FIFO_STATUS 0x17
#define NRF24_REG_DYNPD 0x1C
#define NRF24_REG_FEATURE 0x1D
#define NRF24_NOP 0xFF
#define NRF24_R_REGISTER 0x00
#define NRF24_W_REGISTER 0x20
#define NRF24_R_RX_PAYLOAD 0x60
#define NRF24_W_TX_PAYLOAD 0xA0
#define NRF24_FLUSH_TX 0xE1
#define NRF24_FLUSH_RX 0xE2
#define NRF24_MASK_RX_DR 6
#define NRF24_MASK_TX_DS 5
#define NRF24_MASK_MAX_RT 4
#define NRF24_PWR_UP 1
#define NRF24_PRIM_RX 0
#define NRF24_ERX_P1 1
#define NRF24_ERX_P0 0
static inline uint8_t read_reg(uint8_t reg)
{
SPI_PORT &= ~(1 << SPI_SS);
SPDR = NRF24_R_REGISTER | reg;
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 = NRF24_W_REGISTER | reg;
while (!(SPSR & (1 << SPIF)))
;
SPDR = val;
while (!(SPSR & (1 << SPIF)))
;
SPI_PORT |= (1 << SPI_SS);
}
void radio_send(const char *data, uint8_t n)
{
}
uint8_t radio_recv(char *buf, uint8_t n)
{
}
void radio_listen(void)
{
}
void radio_init(const struct radio_cfg *cfg)
{
uint8_t conf;
SPI_DDR |= (1 << SPI_SS) | (1 << S2PI_SCK) | (1 << SPI_MOSI);
SPI_PORT |= (1 << SPI_SS);
SPCR |= (1 << SPE) | (1 << MSTR);
NRF24_CE_DDR |= (1 << NRF24_CE);
NRF24_CE_PORT &= ~(1 << NRF24_CE);
_delay_ms(NRF24_POWER_ON_RST_DELAY);
// disable IRQs, set CRC encoding scheme to 2 bytes
conf = 0;
conf |= (1 << NRF24_MASK_RX_DR);
conf |= (1 << NRF24_MASK_TX_DS);
conf |= (1 << NRF24_MASK_MAX_RT);
conf |= (1 << NRF24_CRCO);
write_reg(NRF24_REG_CONFIG, conf);
// only use data pipe 0
conf = 0;
conf &= ~(1 << NRF24_ERX_P1);
conf |= (1 << NRF24_ERX_P0);
write_reg(NRF24_REG_EN_RXADDR, conf);
// set address width to 3 bytes
write_reg(NRF24_REG_SETUP_AW, 0x01);
conf = 0;
conf =
}
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