1: /* I2C test program that writes & reads data to an I2C EEPROM device. */

     2: 

     3: #include <pic.h>

     4: #include "delay.h"

     5: #include "i2c.h"

     6: 

     7: #define ROM 0xA0        /* I2C EEPROM */

     8: 

     9: void flashled(void) {           /* flash a led on RB0 */

    10:         while(1) {

    11:             RB0 = 1;

    12:             DelayMs(200);

    13:             RB0 = 0;

    14:             DelayMs(200);

    15:         }

    16: }

    17: 

    18: 

    19: void WriteByte(unsigned char addr, unsigned char byte) {

    20:         i2c_WriteTo(ROM);

    21:         if (i2c_PutByte(addr)==I2C_ERROR)

    22:             flashled();

    23:         if (i2c_PutByte(byte)==I2C_ERROR)

    24:             flashled();

    25: }

    26: 

    27: int ReadByte(unsigned char addr) {

    28:         i2c_WriteTo(ROM);

    29:         if (i2c_PutByte(addr)==I2C_ERROR)

    30:             flashled();

    31:         i2c_ReadFrom(ROM);

    32:         return i2c_GetByte(I2C_LAST);

    33: }

    34: 

    35: void main(void) {

    36: unsigned char count,val;

    37: 

    38: TRISB=0;        /* use a led on RB0 - set as output */

    39: PORTB=0;

    40: RB0=0;

    41: 

    42: /* initialize i2c */

    43: #ifdef I2C_MODULE

    44:     SSPMode(MASTER_MODE);

    45:     SSPEN = 1;

    46:     CKP = 1;

    47: #else

    48:     SCL_DIR = I2C_OUTPUT;

    49:     SDA_DIR = I2C_OUTPUT;

    50:     SDA = 0;

    51:     SCL = 0;

    52: #endif

    53: 

    54: 

    55: while(1) {

    56:     for(count=0; count < 10; ++count) {

    57:         WriteByte(count,count);           /* write to I2C EEPROM */

    58:         val = ReadByte(count);            /* read back value */

    59:         if (val != count)                 /* verify */

    60:             flashled();

    61:     }

    62:     DelayMs(200);

    63: }

    64: }

    65: 

    66: