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jelodavid
Joined: 03 Apr 2005
Posts: 22
Location: Laguna Philippines
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| Storing long string on serial EEPROM |
 Posted: Fri Aug 08, 2008 11:42 pm |
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| Hello! I'm PIC C newbie programmer. Could you give me an example program on Serial EEPROM (24LC08) that will store long string of text on it then can be retrieve or display on LCD. I'll be using PIC16F876 or PIC16F877 mcu. Many thanks in advance.... |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Sun Aug 10, 2008 1:39 pm |
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| Quote: |
Could you give me an example program on Serial EEPROM (24LC08) that will store long string of text on it then can be retrieve or display on LCD. |
Here is a simple program that does those things.
| Code: | #include <16F877.H>
#fuses XT,NOWDT,NOPROTECT,BROWNOUT,PUT,NOLVP
#use delay (clock=4000000)
//#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)
#include "flex_lcd.c"
#define EEPROM_SDA PIN_C4
#define EEPROM_SCL PIN_C3
#include <24256.c>
char const line1[]= {"Hello World"};
//=================================
void main()
{
int8 i;
int8 buffer[17];
lcd_init();
// Write "Hello World" to external eeprom chip.
for(i = 0; i < sizeof(line1); i++)
write_ext_eeprom(i, line1[i]);
// Read characters from the external eeprom chip
// and write them into a RAM buffer.
for(i = 0; i < sizeof(line1); i++)
buffer[i] = read_ext_eeprom(i);
// Display the message on the LCD.
printf(lcd_putc, buffer);
while(1);
} |
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jelodavid
Joined: 03 Apr 2005
Posts: 22
Location: Laguna Philippines
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| Posted: Mon Aug 11, 2008 6:16 am |
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Thanks a lot! |
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souravkumarkar
Joined: 31 Dec 2011
Posts: 5
Location: Baripada
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| received data from pc & write in eeprom |
| Posted: Sat Dec 31, 2011 2:03 pm |
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sir,
i m try many time but result is zero . |
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temtronic
Joined: 01 Jul 2010
Posts: 9226
Location: Greensville,Ontario
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| Posted: Sat Dec 31, 2011 2:18 pm |
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| Do you have the correct value pullup resistors on the I2C lines? |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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incubator
Joined: 14 Jan 2012
Posts: 1
Location: California
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| Posted: Fri Mar 09, 2012 9:54 pm |
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The code has a little mistake, put this on the begining of the main code:
//================
init_ext_eeprom(); // Call before the other functions are used
//================== |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Sat Mar 10, 2012 9:07 pm |
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That routine just consists of these two lines, which set SCL and SDA to
be input pins:
| Code: |
void init_ext_eeprom()
{
output_float(EEPROM_SCL);
output_float(EEPROM_SDA);
}
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The PIC sets all i/o pins to be inputs during power-on reset. So it really
isn't necessary to call that function. It's just doing something that has
already been done anyway by the hardware. |
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