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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_IRQ PD7
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;
}
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);
// CE=0 for standby-i mode
DDRB |= (1 << NRF_CE);
PORTB &= ~(1 << NRF_CE);
_delay_ms(500);
}
int main(void)
{
char s[5];
uart_init();
radio_init();
for (int i = 0; i < 10; i++) {
uint8_t val = read_reg(0x00);
sprintf(s, "%x", val);
uart_write("CONFIG: ");
uart_write_line(s);
}
return 0;
}
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