7Semi_I2C_Interface.h

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#pragma once
#include "7Semi_Interface.h"
#include <Wire.h>
 
class I2C_Interface : public Interface_7Semi
{
public:
    TwoWire *i2c = nullptr;
    uint8_t address = 0;
 
    bool beginI2C(uint8_t addr, TwoWire &wire, uint32_t speed,
                  uint8_t sda = 255, uint8_t scl = 255)
    {
        address = addr;
        i2c = &wire;
 
#if defined(ESP32)
        if (sda != 255 && scl != 255)
            i2c->begin(sda, scl);
        else
            i2c->begin();
#else
        i2c->begin();
#endif
        // i2c->setClock(speed);
 
        // Probe device
        i2c->beginTransmission(address);
        return (i2c->endTransmission() == 0);
    }
 
    int8_t read(uint8_t reg, uint8_t *data, uint32_t len) override
    {
        if (!i2c)
            return -1;
        i2c->beginTransmission(address);
        i2c->write(reg );
 
        if (i2c->endTransmission(false) != 0)
            return -1;
 
        delay(1);
        
        if (len > 255)
            return -3;
        uint8_t received = i2c->requestFrom(address, (uint8_t)len);
        if (received != len)
            return -2;
 
        for (uint32_t i = 0; i < len; i++)
        {
            if (!i2c->available())
                return -4;
            data[i] = i2c->read();
        }
        // Serial.print("R-Reg: ");
        // Serial.print(reg, HEX);
        // Serial.print(" |Data: ");
        // for (int i = 0; i < len; i++)
        // {
        //     Serial.print(" ");
        //     Serial.print(data[i], HEX);
        // }
        // Serial.println();
 
        return 0;
    }
 
    bool beginSPI(uint8_t, SPIClass &, uint32_t,
              uint8_t, uint8_t, uint8_t) override
    {
        return false;
    }
 
    int8_t write(uint8_t reg, const uint8_t *data, uint32_t len) override
    {
        if (!i2c)
            return -1;
 
        i2c->beginTransmission(address);
        i2c->write(reg);
        for (uint32_t i = 0; i < len; i++)
            i2c->write(data[i]);
 
        uint8_t status = i2c->endTransmission();
      
        // Serial.print("W-Reg: ");
        // Serial.print(reg, HEX);
        // Serial.print(" |Data: ");
        // for (int i = 0; i < len; i++)
        // {
        //     Serial.print(" ");
        //     Serial.print(data[i], HEX);
        // }
        // Serial.println();
        return (status == 0) ? 0 : -status;
    }
};