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- // -----------------------------------------------------------------------------
- // Abstract I2C sensor class (other sensor classes extend this class)
- // Copyright (C) 2017-2018 by Xose Pérez <xose dot perez at gmail dot com>
- // -----------------------------------------------------------------------------
-
- #if SENSOR_SUPPORT && ( I2C_SUPPORT || EMON_ANALOG_SUPPORT )
-
- #pragma once
-
- #include "BaseSensor.h"
-
- class I2CSensor : public BaseSensor {
-
- public:
-
- void setAddress(unsigned char address) {
- if (_address == address) return;
- _address = address;
- _dirty = true;
- }
-
- unsigned char getAddress() {
- return _address;
- }
-
- // Descriptive name of the slot # index
- String slot(unsigned char index) {
- return description();
- };
-
- // Address of the sensor (it could be the GPIO or I2C address)
- String address(unsigned char index) {
- char buffer[5];
- snprintf(buffer, sizeof(buffer), "0x%02X", _address);
- return String(buffer);
- }
-
- protected:
-
- // Specific for I2C sensors
- unsigned char _begin_i2c(unsigned char address, size_t size, unsigned char * addresses) {
-
- // Check if we should release a previously locked address
- if (_previous_address != address) {
- i2cReleaseLock(_previous_address);
- }
-
- // If we have already an address, check it is not locked
- if (address && !i2cGetLock(address)) {
- _error = SENSOR_ERROR_I2C;
-
- // If we don't have an address...
- } else {
-
- // Trigger auto-discover
- address = i2cFindAndLock(size, addresses);
-
- // If still nothing exit with error
- if (address == 0) _error = SENSOR_ERROR_I2C;
-
- }
-
- _previous_address = address;
- return address;
-
- }
-
- unsigned char _previous_address = 0;
- unsigned char _address = 0;
-
- };
-
- #endif // SENSOR_SUPPORT && I2C_SUPPORT
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