LibTeleinfo/examples/ESP8266_WifInfo/config.cpp

// **********************************************************************************
// ESP8266 Teleinfo WEB Server configuration Include file
// **********************************************************************************
// Creative Commons Attrib Share-Alike License
// You are free to use/extend this library but please abide with the CC-BY-SA license:
// Attribution-NonCommercial-ShareAlike 4.0 International License
// http://creativecommons.org/licenses/by-nc-sa/4.0/
//
// For any explanation about teleinfo ou use , see my blog
// http://hallard.me/category/tinfo
//
// This program works with the Wifinfo board
// see schematic here https://github.com/hallard/teleinfo/tree/master/Wifinfo
//
// Written by Charles-Henri Hallard (http://hallard.me)
//
// History : V1.00 2015-06-14 - First release
//
// All text above must be included in any redistribution.
//
// **********************************************************************************
#include "./config.h" 

// Configuration structure for whole program
_Config config;


uint16_t crc16Update(uint16_t crc, uint8_t a)
{
  int i;
  crc ^= a;
  for (i = 0; i < 8; ++i)  {
    if (crc & 1)
      crc = (crc >> 1) ^ 0xA001;
    else
      crc = (crc >> 1);
  }
  return crc;
}

/* ======================================================================
Function: eeprom_dump
Purpose : dump eeprom value to serial 
Input 	: -
Output	: -
Comments: -
====================================================================== */
void eepromDump(uint8_t bytesPerRow) 
{
  uint16_t i,b;
  char buf[10];
  uint16_t j=0 ;
  
  // default to 16 bytes per row
  if (bytesPerRow==0)
    bytesPerRow=16;

  Debugln();
    
  // loop thru EEP address
  for (i = 0; i <= sizeof(_Config); i++) {
    // First byte of the row ?
    if (j==0) {
			// Display Address
      Debug(buf);
      Debugf("%04X : ", i);
    }

    // write byte in hex form
    Debugf("%02X ", EEPROM.read(i));

		// Last byte of the row ?
    // start a new line
    if (++j >= bytesPerRow) {
			j=0;
      Debugln();
		}
  }
}

/* ======================================================================
Function: readConfig
Purpose : fill config structure with data located into eeprom
Input 	: -
Output	: true if config found and crc ok, false otherwise
Comments: -
====================================================================== */
bool readConfig (void) 
{
	uint16_t crc = ~0;
	uint8_t * pconfig = (uint8_t *) &config ;
	uint8_t data ;

	// For whole size of config structure
	for (uint8_t i = 0; i < sizeof(_Config); ++i) {
		// read data
		data = EEPROM.read(i);
		
		// save into struct
		*pconfig++ = data ;
		
		// calc CRC
		crc = crc16Update(crc, data);
	}
	
	// CRC Error ?
	if (crc != 0) {
		// Clear config
		memset(&config, 0, sizeof( _Config ));
		return false;
	}
	
	return true ;
}

/* ======================================================================
Function: saveConfig
Purpose : save config structure values into eeprom
Input 	: -
Output	: true if saved and readback ok
Comments: once saved, config is read again to check the CRC
====================================================================== */
bool saveConfig (void) 
{
  uint8_t * pconfig ;
  bool ret_code;

  // Init pointer 
  pconfig = (uint8_t *) &config ;
	
	// Init CRC
  config.crc = ~0;

	// For whole size of config structure, pre-calculate CRC
  for (uint8_t i = 0; i < sizeof (_Config) - 2; ++i)
    config.crc = crc16Update(config.crc, *pconfig++);

	// Re init pointer 
  pconfig = (uint8_t *) &config ;

	// For whole size of config structure, write to EEP
  for (byte i = 0; i < sizeof(_Config); ++i) 
	    EEPROM.write(i, *pconfig++);

  // Physically save
  EEPROM.commit();
  
  // Read Again to see if saved ok
  ret_code = readConfig();
  
  Debug(F("Write config"));
  
  if (ret_code)
    Debugln(F("OK!"));
  else
    Debugln(F("Error!"));
  
  // return result
  return (ret_code);
}

/* ======================================================================
Function: showConfig
Purpose : display configuration
Input 	: -
Output	: -
Comments: -
====================================================================== */
void showConfig() 
{
 
}