#include	<pic.h>
#include  <conio.h>
#include  <stdio.h>

#include "i2cmsu.h"


#define DATA_EEMEM_PROTECT_DISABLE 0x0100
#define XT_OSC 0x0001
#define DISABLE_DEBUG 0x0800

#define CP0		0x1010
#define CP1		0x2020

/* CP0,CP1  code protect off*/
/* other bits zero which means WDT disabled
   Low Voltage prm disabled, brownout disabled
   power up timer enabled */

__CONFIG((CP1 | CP0) | DATA_EEMEM_PROTECT_DISABLE  | XT_OSC | DISABLE_DEBUG);



#define bitset(var,bitno) ((var) |= (1 << (bitno)))
#define bitclr(var,bitno) ((var) &= ~(1 << (bitno)))
#define bittst(var,bitno) (var & (1 << (bitno)))


// Either dump previously written text from ROM to interface, or capture bytes 
// from serial port and dump to memory.
// do the writes one block at a time
// capture to 64 byte buffer before writing


char buf[64];

#define ROM 0xA0        /* I2C EEPROM */

bank1 unsigned char received_char;
bank1 unsigned char got_char_flag;

/* return 8 bit char from Recieve port */
/* interrupt driven version */
unsigned char getch ()
{

  /* while (!RCIF) */
  /* while (!bittst(PIR1,5));*/  /* check RCIF bit */
  while (!got_char_flag);
  got_char_flag = 0;
  return(received_char);
}

/* send 8 bit char to Recieve port */
void putch (c)
     char c;

{
  /* wait until transmit reg empty */
  /* while (!TXIF) */
  while (!bittst(PIR1,4));  /* check RCIF bit */
  TXREG = c;
}

void pcrlf ()
{
  putch(0x0a);
  putch(0x0d);
}

/* interrupt service routine */
void interrupt
pic_isr(void)
{

  /* see if this interrupt was generated by a receive character */
  if (bittst(PIR1,5)) {  /* check RCIF bit */
      received_char = RCREG;  /* reading this register clears interrupt bit */
      got_char_flag = 1;
  }
}


// i2c clock freq = Fosc/4(SSPAD+1)
// 100000(SSPPAD+1) = 3686400/4
//  SSPAD = 8.2, use 8, will be close to 100 Khz

bank1 char i;
bank1 char inchar;

main(void)
{

  
  /* setup Async communication */
  bitclr(TXSTA, 6); /* 8-bit transmit */
  bitset(TXSTA, 5); /* transmit enable*/
  bitclr(TXSTA, 4); /* async mode */
  bitset(TXSTA, 2); /* high speed mode */

  SPBRG = 95;  /* 9600 in high baud rate mode, crystal = 14.7456 Mhz */


  bitset(TRISC, 7); /* serial port enable */
  bitset(TRISC, 6); /* serial port enable */
  bitset(RCSTA, 7); /* serial port enable */
  bitclr(RCSTA, 6); /* 8-bit reception */

  bitset(RCSTA, 4); /* enable recieve */
  
  /* enable I2C */
  
  SSPCON = 0x28;  //Master mode

  //  SSPADD = 8;  // close to 100 Khz rate on i2c bus for 3.6864 Mhz
  //SSPADD = 16;  // try 50 Khz, verified to work
  //SSPADD = 1;  // over 400Khz  for 3.6864 Mhz, verified to work
  SSPADD = 8;  // about 400Khz  for 14.7456 Mhz, verified to work

  // slew control does not seem to matter much 
  //bitset(SSPSTAT,7); //disable slew rate control for 100 Khz
  bitset(SSPCON,5);  //SSPEN = 1;
  bitset(SSPCON,4);  //CKP = 1;
  bitset(TRISC,3);
  bitset(TRISC,4);  // SDA, SCL pins are inputs

  /* enable interrupts */
  bitset(PIE1, 5);  /* enable receive interrupt, RCIE */
  bitset(INTCON,6); /* enable peripheral interrupts, PEIE */
  bitset(INTCON,7); /* enable global interrupts, GIE */


  printf("Enter 'w'(write), or 'r' (read): ");
  pcrlf ();
  inchar=getch();
  if (inchar == 'w') {
    pcrlf ();
    printf("Capturing next 64 bytes for write to memory");
    pcrlf ();
    for (i=0;i<64;i++) {
      buf[i] = getch();
    }
    printf("Block write to memory");
    pcrlf ();
    for (i=0;i<64;i++) {
      printf("Write at %d, val: %x (%c) \n",i,buf[i], buf[i]);
      pcrlf ();
    }
    block_mem_write(ROM,0,buf);
    printf("Mem Write complete");
    pcrlf ();
  } else if (inchar == 'r') {
    printf("###Reading first 64 memory locations, via a block read");
    pcrlf ();
    block_mem_read(ROM,0,buf);
    for (i=0;i<64;i++) {
     printf("Read %d, val: %x (%c) \n",i,buf[i], buf[i]);
      pcrlf ();
    }
    pcrlf ();
    printf("###Mem Read complete");
    pcrlf ();
  }
      
  while(1);

}





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