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/* Autor: Ján Suèan <jan@jansucan.sk>
*
* Zdrojove kody, ich casti a subory z nich vzniknute priamo alebo nepriamo
* (objektove subory, Intel Hex, ...) prosim nepouzivajte komercne, ani ako
* sucast komercnych diel. Vsetky ostatne pripady pouzitia su dovolene.
*
* Please don't use the source codes, their parts and files created from them
* directly or indirectly, (object files, Intel Hex files, ...) for commercial
* purposes, not even as a part of commercial products. All other use cases
* are allowed.
*/
#include <avr/io.h>
#include <fan_controller/hw/eeprom.h>
#include <fan_controller/error.h>
/** Velkost pamate EEPROM v bajtoch */
#define EEPROM_SIZE_IN_BYTES 512U // bajtov
static void eeprom_write_byte(uint16_t address, uint8_t byte);
static void eeprom_read_byte(uint16_t address, uint8_t *const byte);
static void eeprom_wait_until_ready(void);
static void eeprom_check_address_and_size(uint16_t address, uint16_t op_size);
/**
* @brief Zapis dat z EEPROM.
*
* @param address Adresa kam sa bude zapisovat.
* @param data Ukazovatel na buffer, odkial sa budu brat bajty pre zapis do EEPROM.
* @param data_size Pocet bajtov co sa budu zapisovat.
*/
void
eeprom_write(uint16_t address, const uint8_t * const data, uint16_t data_size)
{
eeprom_check_address_and_size(address, data_size);
for (uint16_t i = 0; i < data_size; i++) {
eeprom_write_byte(address, data[i]);
++address;
}
}
/**
* @brief Precitanie dat z EEPROM.
*
* @param address Adresa odkial sa bude citat.
* @param data Ukazovatel na buffer, kde sa precitane bajty ulozia.
* @param data_size Pocet bajtov co sa budu citat.
*/
void
eeprom_read(uint16_t address, uint8_t * const data, uint16_t data_size)
{
eeprom_check_address_and_size(address, data_size);
for (uint16_t i = 0; i < data_size; i++) {
eeprom_read_byte(address, &(data[i]));
++address;
}
}
/**
* @brief Zapis bajtu z EEPROM.
*
* @param address Adresa kam sa bude zapisovat.
* @param byte Bajt pre zapis na adresu @p address.
*/
void
eeprom_write_byte(uint16_t address, uint8_t byte)
{
eeprom_wait_until_ready();
EEAR = address;
EEDR = byte;
EECR |= (1 << EEMWE);
EECR |= (1 << EEWE);
}
/**
* @brief Precitanie bajtu z EEPROM.
*
* @param address Adresa odkial sa bude citat.
* @param byte Ukazovatel na bajt, kde bude ulozena precitana hodnota.
*/
void
eeprom_read_byte(uint16_t address, uint8_t *const byte)
{
eeprom_wait_until_ready();
EEAR = address;
EECR |= (1<<EERE);
*byte = EEDR;
}
/**
* @brief Pocka, az bude pamat EEPROM pripravena na dalsiu operaciu.
*
* Blokujuca funkcia.
*/
void
eeprom_wait_until_ready(void)
{
while ((EECR & (1 << EEWE)) != 0) {
;
}
}
/**
* @brief Skontroluje ci sa velkost dat @p op_size vojde do EEPROM od adresy @p address.
*
* Ak sa data nezmestia, vyvola chybu.
*
* @param address Adresa v EEPROM.
* @param op_size Pocet bajtov dat.
*/
void
eeprom_check_address_and_size(uint16_t address, uint16_t op_size)
{
if ((address >= EEPROM_SIZE_IN_BYTES) || ((address + op_size) > EEPROM_SIZE_IN_BYTES)) {
error();
}
}
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