/**
* \brief Erase bytes from all EEPROM pages.
*
* This function erases bytes from all EEPROM pages, so that every location
* written to in the page buffer reads 0xFF.
*/
void nvm_eeprom_erase_bytes_in_all_pages(void)
{
// Wait until NVM is ready
nvm_wait_until_ready();
// Issue EEPROM Erase All command
nvm_issue_command(NVM_CMD_ERASE_EEPROM_gc);
}
/**
* \brief Read a fuse byte.
*
* This function reads and returns the value of a given fuse byte.
*
* \param fuse Fuse byte to read.
*
* \return Byte value of fuse.
*/
uint8_t nvm_fuses_read(enum fuse_byte_t fuse)
{
// Wait until NVM is ready
nvm_wait_until_ready();
// Set address
NVM.ADDR0 = fuse;
// Issue READ_FUSES command
nvm_issue_command(NVM_CMD_READ_FUSES_gc);
return NVM.DATA0;
}
/**
* \brief Read one byte from EEPROM using IO mapping.
*
* This function reads one byte from EEPROM using IO-mapped access.
* If memory mapped EEPROM is enabled, this function will not work.
*
* \param addr EEPROM address, between 0 and EEPROM_SIZE
*
* \return Byte value read from EEPROM.
*/
uint8_t nvm_eeprom_read_byte(eeprom_addr_t addr)
{
Assert(addr <= EEPROM_SIZE);
/* Wait until NVM is ready */
nvm_wait_until_ready();
/* Set address to read from */
NVM.ADDR2 = 0x00;
NVM.ADDR1 = (addr >> 8) & 0xFF;
NVM.ADDR0 = addr & 0xFF;
/* Issue EEPROM Read command */
nvm_issue_command(NVM_CMD_READ_EEPROM_gc);
return NVM.DATA0;
}
/**
* \brief Erase bytes from EEPROM page.
*
* This function erases bytes from one EEPROM page, so that every location
* written to in the page buffer reads 0xFF.
*
* \param page_addr EEPROM Page address, between 0 and EEPROM_SIZE/EEPROM_PAGE_SIZE
*/
void nvm_eeprom_erase_bytes_in_page(uint8_t page_addr)
{
// Wait until NVM is ready
nvm_wait_until_ready();
// Calculate page address
uint16_t address = (uint16_t)(page_addr * EEPROM_PAGE_SIZE);
Assert(address <= EEPROM_SIZE);
// Set address
NVM.ADDR2 = 0x00;
NVM.ADDR1 = (address >> 8) & 0xFF;
NVM.ADDR0 = address & 0xFF;
// Issue EEPROM Erase command
nvm_issue_command(NVM_CMD_ERASE_EEPROM_PAGE_gc);
}
