#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <irq.h>
#include <uart.h>
#include <time.h>
#include <generated/csr.h>
#include <console.h>

#include "ahwflags.h"
#include "eeprom.h"

unsigned char eeprom_spi_xfer(unsigned char length, unsigned int mosi)
{
    eeprom_mosi_write(mosi);
    eeprom_length_write(length);
    eeprom_ctrl_write(CTRL_START);
    while(!(eeprom_status_read() & STATUS_DONE));
    return eeprom_miso_read();
}

void eeprom_write_enable(void)
{
    eeprom_spi_xfer(8, WREN<<16);
}

void eeprom_write_disable(void)
{
    eeprom_spi_xfer(8, WRDI<<16);
}

unsigned char eeprom_read_status(void)
{
    return eeprom_spi_xfer(16, RDSR<<16) & 0xff;
}

void eeprom_write_status(unsigned char data)
{
    eeprom_spi_xfer(16, (WRSR<<16) | (data << 8));
}


void eeprom_write(unsigned char adr, unsigned char data)
{
    eeprom_spi_xfer(24, (WRITE<<16) | (adr << 8) | data);
}

unsigned char eeprom_read(unsigned char adr)
{
    return eeprom_spi_xfer(24, (READ<<16) | (adr << 8)) & 0xff;
}