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#include <stdio.h>
#include <stdlib.h>
#include <avr/io.h>
#include <util/delay.h>
#include "uart.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 NRF_CE PB1
#define NRF_CE_DDR DDRB
#define NRF_CE_PORT PORTB
#define NRF_IRQ PD7
#define NRF_RST_DELAY_MS 100
#define NRF_CE_PULSE_WIDTH_US 20
#define NRF_STATE_CHG_DELAY_US 130
static inline uint8_t read_reg(uint8_t reg)
{
SPI_PORT &= ~(1 << SPI_SS);
SPDR = reg & 0x1F;
while (!(SPSR & (1 << SPIF)))
;
SPDR = 0xFF;
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 & 0x1F) | 0x20;
while (!(SPSR & (1 << SPIF)))
;
SPDR = val;
while (!(SPSR & (1 << SPIF)))
;
SPI_PORT |= (1 << SPI_SS);
}
static inline void print_config(void)
{
char s[15];
uint8_t i, rv;
uart_write_line("NRF24L01 configuration:");
for (i = 0; i <= 0x17; i++) {
rv = read_reg(i);
sprintf(s, "\t0x%02X: 0x%02X", i, rv);
uart_write_line(s);
}
}
void radio_init(void)
{
SPI_DDR |= (1 << SPI_SS) | (1 << SPI_SCK) | (1 << SPI_MOSI);
SPI_PORT |= (1 << SPI_SS);
SPCR |= (1 << SPE) | (1 << MSTR);
NRF_CE_DDR |= (1 << NRF_CE);
NRF_CE_PORT &= ~(1 << NRF_CE);
_delay_ms(NRF_RST_DELAY_MS);
write_reg(0x00, 0b00001100); /* use 2-byte CRC code */
write_reg(0x03, 0b00000001); /* set address width to 3 bytes */
write_reg(0x04, 0b00000000); /* disable automatic retransmission */
write_reg(0x05, 0b01110011); /* use 2.515GHz channel */
write_reg(0x06, 0b00000110); /* set data rate to 1Mbps */
}
int main(void)
{
uart_init();
radio_init();
print_config();
return 0;
}
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