myi2c.cpp

00001 #include "myi2c.h"
00002 
00003 PCF8563::PCF8563(PinName sda, PinName scl) : i2c (sda, scl)
00004 {
00005     i2c.frequency(PCF8563_FREQ);        //set the frequency
00006 }
00007 /*
00008  * read function from the TRC
00009  * read a value and return it
00010  */
00011 uint8_t PCF8563::read(int i2c_r, int address)
00012 {
00013     uint8_t value; //temp 8bit
00014     i2c.start();    //start
00015     i2c.write(i2c_r);  //write address
00016     i2c.write(address);
00017     i2c.start();    //restart
00018     i2c.write(address);  //read address
00019     value = i2c.read(0);
00020     i2c.stop();
00021 
00022     return value;   //returns var value of the method
00023 }
00024 uint8_t PCF8563::read(int i2c_w, int i2c_r, int address)
00025 {
00026     uint8_t value; //temp 8bit
00027     i2c.start();    //start
00028     i2c.write(i2c_w);  //write address
00029     i2c.write(address);
00030     i2c.start();    //restart
00031     i2c.write(i2c_r);  //read address
00032     value = i2c.read(0);
00033     i2c.stop();
00034     return value;
00035 }
00036 /* firtly you write the address from the rtc
00037  * secondly the register address
00038  * last but not leat your value
00039  */
00040 void PCF8563::write(int i2c_w, int address, int value)
00041 {
00042     i2c.start();    //start
00043     i2c.write(i2c_w);  //i2c write address
00044     i2c.write(address);
00045     i2c.write(value);
00046     i2c.stop(); //stop
00047 }
00048 /*
00049  * Binary Coded Decimal converter into decimal
00050  */
00051 uint8_t PCF8563::bcdToDec(uint8_t val)
00052 {
00053     return (10*((val>>4)& 0x0F)+(val & 0x0F));      //convert from bcd to dec
00054 }