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#include <stdlib.h>
#define I2C_EEPROM_ADDR 0x50
class Storage {
private:
uint8_t num_anims;
uint8_t first_free_page;
uint8_t i2c_start_write(void);
uint8_t i2c_start_read(void);
void i2c_stop(void);
uint8_t i2c_send(uint8_t len, uint8_t *data);
uint8_t i2c_receive(uint8_t len, uint8_t *data);
uint8_t i2c_read(uint8_t addrhi, uint8_t addrlo, uint8_t len, uint8_t *data);
uint8_t i2c_write(uint8_t addrhi, uint8_t addrlo, uint8_t len, uint8_t *data);
enum I2CStatus : uint8_t {
I2C_OK,
I2C_START_ERR,
I2C_ADDR_ERR,
I2C_ERR
};
public:
Storage() { num_anims = 0; first_free_page = 0;};
/**
* Enable the storage hardware: Configures the internal I2C
* module and reads the number of stored patterns from the
* EEPROM.
*/
void enable();
/**
* Prepares the storage for a complete overwrite by setting the
* number of stored animations to zero. The next save operation
* will get pattern id 0 and overwrite the first stored pattern.
*
* This function does not delete patterns from the EEPROM. However,
* it does reset the pattern counter, thus making all saved patterns
* unavailable to the load and numPatterns functions.
*/
void reset();
/**
* Checks whether the EEPROM contains animathion data.
*
* @return true if the EEPROm contains valid-looking data
*/
bool hasData();
/**
* Accessor for the number of saved patterns on the EEPROM.
* Only returns valid data if hasData() returned true.
*
* @return number of patterns
*/
uint8_t numPatterns() { return num_anims; };
/**
* Load pattern from EEPROM.
*
* @param idx pattern index (starting with 0)
* @param data pointer to data structure for the pattern. Must be
* at least 260 bytes
*/
void load(uint8_t idx, uint8_t *data);
/**
* Save (possibly partial) pattern on the EEPROM. 32 bytes of
* dattern data will be read and stored, regardless of the
* pattern header.
*
* @param data pattern data. Must be at least 32 bytes
*/
void save(uint8_t *data);
/**
* Continue saving a pattern on the EEPROM. Appends 32 bytes of
* pattern data after the most recently written block of data
* (i.e., to the pattern which is currently being saved).
*
* @param data pattern data. Must be at least 32 bytes
*/
void append(uint8_t *data);
};
extern Storage storage;
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