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ruijing
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| eeprom |
 Posted: Sun Mar 09, 2008 10:03 pm |
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hi i using PIC18F452 or PIC18F4520
i can write to the eeprom but power off the thing i write in is gone and is clear to FF can u help me. pls thk |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Sun Mar 09, 2008 11:04 pm |
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Are you doing this on real hardware, or this being done on a simulator
such as Proteus ?
If it's real hardware then post a short test program that shows the
problem. Also post your compiler version.
Here is an example program of how to save a value to eeprom
when you push a button. Then when the PIC is powered up again,
the program will read the last value that was saved in eeprom
and start the count at the place where it left off:
http://www.ccsinfo.com/forum/viewtopic.php?t=22109&start=17
Note:
That example is for a 16F877. Note that the #rom address for
embedded eeprom data is different for an 18F452. It's 0xF00000.
Example:
http://www.ccsinfo.com/forum/viewtopic.php?t=25522&start=5
Last edited by PCM programmer on Sun Mar 09, 2008 11:21 pm; edited 1 time in total |
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ruijing
Guest
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| reply |
| Posted: Sun Mar 09, 2008 11:17 pm |
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Yes i do it with real hardware and i use PCW C compiler IDE
| Code: |
#include "18F452.h" // 18F4520.h
#device ICD=true // Able in-circuit programmer
#fuses HS,NOWDT,NOLVP,WDT128,NOPUT,NOBROWNOUT,NOPROTECT,NOWRTD,CPD
#use delay(clock=20000000) // 20 MHz
#use rs232(parity=N,BITS=8,xmit=PIN_C6,rcv=PIN_C7)
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "reg18F452.h"
//#define buffer_size 255
static char answer,ans;
static char answer2[5]={"test"};
static char answer3[5]={"baud"};
static char num;
static char num2;
static int8 key,key1,x,y;
static char RxMessage[20];
static char RxMessage2[5];
static int8 next_in,check,count,next_out;
static char baudrate;
#define ADDR 0x50
byte done=0;
void ide()
{
output_low(PIN_A0); //switch 1
output_low(PIN_A1); //switch 1
output_low(PIN_A2); //switch 2
output_low(PIN_A3); //switch 2
output_low(PIN_E0); //switch 3
output_low(PIN_A5); //switch 3
output_low(PIN_B2); //switch 4
output_low(PIN_B3); //switch 4
}
void switch2()
{
switch (num2)
{
case '1':
output_low(PIN_E0);
output_low(PIN_A5);
output_low(PIN_B2);
output_low(PIN_B3);
output_low(PIN_A2);
output_low(PIN_A3); // for RFout 1
printf("\r\nRFout 1\r\n");
break;
case '2':
output_low(PIN_E0);
output_low(PIN_A5);
output_low(PIN_B2);
output_low(PIN_B3);
output_high(PIN_A2);
output_low(PIN_A3); // for RFout 2
printf("\r\nRFout 2\r\n");
break;
case '3':
output_low(PIN_E0);
output_low(PIN_A5);
output_low(PIN_B2);
output_low(PIN_B3);
output_low(PIN_A2);
output_high(PIN_A3); // for RFout 3
printf("\r\nRFout 3\r\n");
break;
case '4':
output_low(PIN_E0);
output_low(PIN_A5);
output_low(PIN_B2);
output_low(PIN_B3);
output_high(PIN_A2);
output_high(PIN_A3); // for RFout 4
printf("\r\nRFout 4\r\n");
break;
}
}
void switch3()
{
switch (num2)
{
case '1':
output_low(PIN_B2);
output_low(PIN_B3);
output_low(PIN_A2);
output_low(PIN_A3);
output_low(PIN_E0);
output_low(PIN_A5); // for RFout 5
printf("\r\nRFout 5\r\n");
break;
case '2':
output_low(PIN_B2);
output_low(PIN_B3);
output_low(PIN_A2);
output_low(PIN_A3);
output_high(PIN_E0);
output_low(PIN_A5); // for RFout 6
printf("\r\nRFout 6\r\n");
break;
case '3':
output_low(PIN_B2);
output_low(PIN_B3);
output_low(PIN_A2);
output_low(PIN_A3);
output_low(PIN_E0);
output_high(PIN_A5); // for RFout 7
printf("\r\nRFout 7\r\n");
break;
case '4':
output_low(PIN_B2);
output_low(PIN_B3);
output_low(PIN_A2);
output_low(PIN_A3);
output_high(PIN_E0);
output_high(PIN_A5); // for RFout 8
printf("\r\nRFout 8\r\n");
break;
}
}
void switch4()
{
switch (num2)
{
case '1':
output_low(PIN_E0);
output_low(PIN_A5);
output_low(PIN_A2);
output_low(PIN_A3);
output_low(PIN_B2);
output_low(PIN_B3); // for RFout 9
printf("\r\nRFout 9\r\n");
break;
case '2':
output_low(PIN_E0);
output_low(PIN_A5);
output_low(PIN_A2);
output_low(PIN_A3);
output_high(PIN_B2);
output_low(PIN_B3); // for RFout 10
printf("\r\nRFout 10\r\n");
break;
case '3':
output_low(PIN_E0);
output_low(PIN_A5);
output_low(PIN_A2);
output_low(PIN_A3);
output_low(PIN_B2);
output_high(PIN_B3); // for RFout 11
printf("\r\nRFout 11\r\n");
break;
case '4':
output_low(PIN_E0);
output_low(PIN_A5);
output_low(PIN_A2);
output_low(PIN_A3);
output_high(PIN_B2);
output_high(PIN_B3); // for RFout 12
printf("\r\nRFout 12\r\n");
break;
}sleep();
}
void switch1()
{
if(key==1)
{
switch (num)
{
case '1': //switch 1
ide();
break;
case '2': output_high(PIN_A0); //switch 1
output_low(PIN_A1); //switch 1
switch2();
break;
case '3': output_low(PIN_A0); //switch 1
output_high(PIN_A1); //switch 1
switch3();
break;
case '4': output_high(PIN_A0); //switch 1
output_high(PIN_A1); //switch 1
switch4();
break;
default: break; // off all antenna
}
key=0;
sleep();
}
}
#INT_EXT
void keyinput()
{
start_of_program:
output_high(PIN_B4);
printf("first 1,2,3,4\r\n");
for(next_in=0;next_in<=20;next_in++)
{
while(!kbhit());
answer=getch();
RxMessage[next_in]=answer;
if(next_in>=1 & next_in<=4)
{
if(RxMessage[next_in]!=answer2[next_in-1] && RxMessage[next_in]!=answer3[next_in-1])
{
printf("\r\n error");
goto start_of_program;
}
}
if(next_in==5)
{
check=0;
for(x=1;x<=4;x++)
{
if(RxMessage[x]!=answer2[x-1])
{
}else
{
check=1;
}
}
for(y=1;y<=4;y++)
{
if (check==1)
{
}else if(RxMessage[y]!=answer3[y-1] )
{
printf("\r\n error");
goto start_of_program;
}
else
{
check=2;
}
}
}
if(next_in>5 && RxMessage[next_in]=='\n' )
{
goto next_run;
}
}
next_run:
printf("\r\n");
for(next_out=1;next_out<=next_in;next_out++)
putc(RxMessage[next_out]);
come_here:
printf("\r\nContinue (Y,N)?\r\n");
do {
ans=getch();
}while(ans!='y' && ans!='n');
if (ans=='y')
{
num=Rxmessage[6];
done=Rxmessage[6];
num2=Rxmessage[8];
if(check==2)
{
switch( num )
{
case '0' : set_uart_speed(9600);
write_eeprom(ADDR,done); break;
case '1' : set_uart_speed(19200);
write_eeprom(ADDR,done); break;
case '2' : set_uart_speed(38400);
write_eeprom(ADDR,done); break;
case '3' : set_uart_speed(57600);
write_eeprom(ADDR,done); break;
}
}else if(check==1)
{
key=1;
}
}
output_low(PIN_B4);
}
void main(void)
{
enable_interrupts(INT_EXT);
enable_interrupts(GLOBAL);
baudrate=(char)read_eeprom(ADDR);
if(baudrate>=0 && baudrate<=3 )
{
switch(baudrate)
{
case '0' : set_uart_speed(9600); break;
case '1' : set_uart_speed(19200); break;
case '2' : set_uart_speed(38400); break;
case '3' : set_uart_speed(57600); break;
}
}
else
set_uart_speed(9600);
for(;;)
{
switch1();
}
} |
thk |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Sun Mar 09, 2008 11:22 pm |
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That's a lot of code. I was editing my post while you were doing
your post. I added a link to a sample program. Look at that first. |
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ruijing
Guest
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| rely |
| Posted: Mon Mar 10, 2008 12:30 am |
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| PCM programmer wrote: | That's a lot of code. I was editing my post while you were doing
your post. I added a link to a sample program. Look at that first. |
still cannot |
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