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Diffstat (limited to 'FanController/fan_controller/hw/eeprom.c')
| -rw-r--r-- | FanController/fan_controller/hw/eeprom.c | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/FanController/fan_controller/hw/eeprom.c b/FanController/fan_controller/hw/eeprom.c new file mode 100644 index 0000000..dcad85c --- /dev/null +++ b/FanController/fan_controller/hw/eeprom.c @@ -0,0 +1,120 @@ +/* Autor: Ján Sučan <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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