First, let me introduce EEPROM 24LC256, which is an electrically erasable read-only memory EEPROM produced by PIC, with a capacity of 256KB and supports a 2-wire serial interface, that is, an I2C interface (if you don’t know I2C, go online to make up your homework), and its device address is 0X1010A2A1A0. A2A1A0 is configurable, and it is connected to GND on the board, so its device address is 0X50.
If we look at the device connections on the board, we can see that it is connected to I2C1 and has a pull-up resistor.
The function we implemented is to write a character to the EEPROM and then read it out. If they are equal, LED1 will light up, and if they are not equal, LED1 will go out.
OpenI2C1( I2C_EN, BRG_VAL ); // Initialization
mPORTBClearBits(BIT_10); //LED1=0
mPORTBSetPinsDigitalOut(BIT_10);
write_24lc256(0x0440,0x12);
delay(10000);
temp=read_24lc256(0x0440);
if(temp==0x12)
mPORTBSetBits(BIT_10);//LED1=1
else
mPORTBClearBits(BIT_10); //LED1=0
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