void eeprom_page_write(unsigned long addr, unsigned char* buf, unsigned char len)
{
spi_select(EEPROM_SS_PORT, EEPROM_SS_PIN);
_delay_us(10);
spi_write(EEPROM_WRITE); // byte write
// wyœlij adres 24-bitowy
spi_write( (addr >> 16) & 0xff);
spi_write( (addr >> 8) & 0xff);
spi_write( addr & 0xff);
// wyœlij bajty do zapisania
for (unsigned char i=0; i < len; i++)
spi_write(buf[i]);
spi_unselect(EEPROM_SS_PORT, EEPROM_SS_PIN);
//_delay_ms(2);_delay_ms(2);_delay_ms(2);_delay_ms(2); // Twc = 6ms
// czekaj na zakoñczenie operacji zapisu (Twc=6ms)
while ( (eeprom_status() & 0x01) ) // Write In Progress (WIP)
_delay_ms(1);
return;
}
/* flash_erase_all - erase all pages on flash memory */
void flash_erase_all()
{
while (eeprom_status() & 0x01) /* wait until write cycle done */
;
EE_CS = 0; /* enable SPI slave */
spi_write_then_read(EE_WREN); /* write-enable instruction */
EE_CS = 1; /* start erase operation */
EE_CS = 0; /* start erase operation */
spi_write_then_read(ERASE_ALL); /* read instruction */
EE_CS = 1; /* start erase operation */
while (eeprom_status() & 0x00) /* wait until erase done */
;
/* re-enable flash write operation */
EE_CS = 0; /* enable SPI slave */
spi_write_then_read(EE_WREN); /* write-enable instruction */
EE_CS = 1; /* start erase operation */
}
/* eeprom_read - read single byte from specified address
* @addr: target address
*/
char eeprom_read(unsigned int addr)
{
char byte = 0;
while (eeprom_status() & 0x01) /* wait until write cycle done */
;
EE_CS = 0; /* active eeprom */
spi_write_then_read(EE_READ); /* read instruction */
spi_write_then_read(addr >> 8); /* higher byte of addr */
spi_write_then_read(addr & 0xff); /* lower byte */
byte = spi_write_then_read(0); /* read data */
EE_CS = 1; /* inactive eeprom */
return byte;
}
/* eeprom_write - write a single byte to specified address
* @addr: target address
* @byte: writting byte of data
*/
void eeprom_write(unsigned int addr, char byte)
{
while (eeprom_status() & 0x01) /* wait until write cycle done */
;
EE_CS = 0; /* active eeprom */
spi_write_then_read(EE_WREN); /* write-enable instruction */
EE_CS = 1; /* inactive eeprom */
EE_CS = 0; /* active eeprom */
spi_write_then_read(EE_WRITE); /* write instruction */
spi_write_then_read(addr >> 8); /* higher byte of addr */
spi_write_then_read(addr & 0xff); /* lower byte */
spi_write_then_read(byte); /* write data */
EE_CS = 1; /* inactive eeprom */
EE_CS = 0; /* active eeprom */
spi_write_then_read(EE_WRDI); /* write-disable instruction */
EE_CS = 1; /* inactive eeprom */
}
void eeprom_chip_erase()
{
eeprom_enable_write(1);
spi_select(EEPROM_SS_PORT, EEPROM_SS_PIN);
_delay_us(10);
spi_write(EEPROM_CE); // chip erase
spi_unselect(EEPROM_SS_PORT, EEPROM_SS_PIN);
// czekaj na zakoñczenie operacji kasowania
while ( (eeprom_status() & 0x01) ) // Write In Progress (WIP)
_delay_ms(1);
eeprom_enable_write(1);
}
