Hello.
I need some information about where to get some samples of a I2C
implementation for a 16f877 PIC with 32Kbit EEPROM model 24AA32A also
from Microchip.
Any comments or suggestions are welcome, until now, I haven't been
able to get it working, the PIC gets rebooted every time I execute the
routines.
I attach some of my code, I'm sorry, but's it's not well commented.
The functions are Serial*.
This is the main code which executes the functions, to be printed on a LCD:
for (i=0; i<16; i++)
{
for (j=0; j<40; j++)
{
result = (SerialRead(i,j)%112)+16;
PaintChar(result, j+1,i+1, MODE_EXOR);
}
}
Any ideas, people??
Thanks.
--
Néstor
+34 687 96 74 81
nesto...@gmail.com
#include "temete4.h"
#include "temete2.h"
void cmd(BYTE parameter)
{
WaitReady();
Save(CMD, parameter);
}
void dt2(BYTE h, BYTE l)
{
WaitReady();
Save(DATA, l);
WaitReady();
Save(DATA,h);
}
void dt1(BYTE inData)
{
WaitReady();
Save(DATA, inData);
}
void Save(bool param, BYTE data_) // SALVADATO
{
RD5 = param; //
TRISB = 0; // Output
PORTB = data_; //
RD7 = 0; // WR
RD6 = 1; // RD
RD4 = 0; // CE
Pause();
RD7 = 1; // WR
}
void PauseLong()
{
unsigned int i;
for ( i=0; i<=65000; i++ )
{
}
}
void PauseQuarterSecond()
{
BYTE i;
for ( i=0; i<=2; i++ )
{
PauseLong();
}
}
void Beep(BYTE mode)
{
unsigned int i;
char j;
BYTE cond;
TRISA0 = 0;
cond = 0;
j = 7;
while(j >= 0)
{
if (mode & (1 << j)) // Long beep
{
if (!cond)
{
for ( i=0; i<= 65000; i++ );
cond = 1;
}
for ( i=0; i<= 15000; i++ );
RA0 = 1;
for ( i=0; i<= 50000; i++ );
RA0 = 0;
}
else if (cond)
{
for ( i=0; i<= 15000; i++ );
RA0 = 1;
for ( i=0; i<= 10000; i++ );
RA0 = 0;
}
j--;
}
}
void BeepError(BYTE mode)
{
Beep(mode);
while(1);
}
void Pause()
{
BYTE i;
for ( i=0; i<=4; i++ )
{
}
}
void Sleep(BYTE steps)
{
BYTE i;
for (i=0; i<steps; i++)
{}
}
void WaitReady(void) /* LEER */
{
//BYTE accum;
BYTE byte0, byte1;
byte0 = 0;
byte1 = 0;
while(!(byte0 && byte1))
{
RD4 = 1; /* CE */
TRISB = 0x03; /* Input */
RD5 = 1; /* CMD */
RD7 = 1; /* WR */
RD6 = 0; /* RD */
RD4 = 0; /* CE */
Pause(); /* Pause */
byte0 = RB0;
byte1 = RB1;
RD6 = 1; /* RD */
RD4 = 1; /* CE */
}
}
void SerialStart()
{
TRISA = 0x02;
RA4 = 1;
RA3 = 1;
Sleep(100);
RA4 = 0;
Sleep(100);
RA3 = 0;
Sleep(100);
}
void SerialStop()
{
TRISA = 0x02;
RA3 = 0;
RA4 = 0;
Sleep(100);
RA3 = 1;
Sleep(100);
RA4 = 1;
Sleep(100);
}
void SerialByteSend(BYTE outData)
{
unsigned int i;
TRISA = 0x02;
RA4 = 0;
for (i=0; i<8; i++)
{
RA4 = (outData >> (7-i))&1;
Sleep(100);
RA3 = 1;
Sleep(200);
RA3 = 0;
Sleep(100);
}
RA4 = 0;
TRISA = 0x0a;
Sleep(100);
RA3 = 1;
Sleep(200);
RA3 = 0;
Sleep(100);
}
BYTE SerialByteRecv()
{
BYTE inData = 0x00;
BYTE i;
TRISA = 0x0a;
for (i=0; i<8; i++)
{
Sleep(100);
RA3 = 1;
Sleep(100);
if (RA4 == 1)
{
inData += (128>>i);
}
Sleep(100);
RA3 = 0;
Sleep(100);
}
TRISA = 0x02;
RA4 = 1;
Sleep(100);
RA3 = 1;
Sleep(200);
RA3 = 0;
Sleep(100);
RA4 = 0;
return inData;
}
void Borrar()
{
unsigned int hh,ll;
dt2(0,0);
cmd(ADPSET);
cmd(AWRON);
for (ll=0; ll<=255; ll++)
{
for (hh=0; hh<=45; hh++)
dt1(0x0); // 0x0: ' '
}
cmd(AWROFF);
}
void Paint(BYTE pattern[8], BYTE x, BYTE y)
{
BYTE i;
unsigned int pos;
pos = (((y-1)*40*8)+x-1)+640;
for (i=0; i<8; i++)
{
dt2((BYTE)(pos / 256),(BYTE)(pos % 256));
cmd(ADPSET);
dt1(pattern[i]);
cmd(0xc4);
pos = pos + 40;
}
}
/* Define processor and include header file. */
#ifndef TEMETE4_H
#define TEMETE4_H
#define A_OUTPUTS 0x02 /* value used to setup TRISA */
#define B_OUTPUTS 0x00 /* value used to setup TRISB */
#define C_OUTPUTS 0x08 /* value used to setup TRISC */
#define D_OUTPUTS 0x00 /* value used to setup TRISD */
#define E_OUTPUTS 0x00 /* value used to setup TRISE */
#define TXHOME 0x40
#define TXAREA 0x41
#define GRHOME 0x42
#define GRAREA 0x43
#define OFFSET 0x22
#define ADPSET 0x24
#define AWRON 0xB0
#define AWROFF 0xB2
#define CMDP 0x01
#define DP 0x00
#define DISP_GR_ON_TXT_ON 0x9c
#define MODE_OR 0x80
#define MODE_EXOR 0x81
#define MODE_AND 0x82
#define ALIGN_LEFT 0
#define ALIGN_RIGHT 1
#define ALIGN_CENTER 2
#define BEEP_START 1
#define BEEP_END 2
#define ERROR_LINEEND 3
#define ERROR_TEXTLENGTH 4
#define ERROR_TEXTPOS 5
#define ERROR_LOGO 6
#define DATA FALSE
#define CMD TRUE
#define __16f877
#include "pic/pic16f877.h"
typedef enum { FALSE, TRUE } bool;
typedef enum t_style{NORMAL, INVERTED} TStyle;
typedef unsigned char BYTE;
void cmd(BYTE parameter);
void Save(bool param, BYTE data_);
void dt2(BYTE h, BYTE l);
void dt1(BYTE inData);
void PauseLong();
void PauseQuarterSecond();
void Beep(BYTE mode);
void BeepError(BYTE mode);
void Pause();
void Sleep(BYTE steps);
void WaitReady(void); /* LEER */
void SerialStart();
void SerialStop();
void SerialByteSend(BYTE data);
BYTE SerialByteRecv();
BYTE SerialRead(BYTE addrH, BYTE addrL);
void Borrar();
void Paint(BYTE pattern[8], BYTE x, BYTE y);
#endif
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