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will
Joined: 28 May 2012
Posts: 24
Location: france
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| eeprom 18f252 |
 Posted: Fri Jun 08, 2012 10:55 am |
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hello, I'm going a robot who saves his career.
I was in a foul or write eeprom read here?
I am willing to put the full code but it is long.
thank you in advance
| Code: | void fonction_memory() {
for(i=0;i<=255;++i)
{
variable=donnee[i];
write_eeprom(i, variable2);
donnee[i]=donnee[i]>>8;
variable=donnee[i];
i=i+1;
write_eeprom(i, variable);
}
}
void fonction_repeat() {
for(i=0;i<=255;++i)
{
variable=read_eeprom(i);
donnee[i]=variable;
i=i+1;
variable2=read_eeprom(i);
variable2=variable2<<8;
donnee[i]=donnee[i]||variable2;
}
}
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Fri Jun 08, 2012 6:36 pm |
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I don't know exactly what you are trying to do. But I think you want to
write 16-bit values to internal eeprom.
Look at this driver file, included with the CCS compiler:
| Quote: |
c:\program files\picc\drivers\internal_eeprom.c
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It has functions to read and write a 16-bit unsigned integer to eeprom:
| Code: |
write_int16_eeprom()
read_int16_eeprom()
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Ttelmah
Joined: 11 Mar 2010
Posts: 19540
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| Posted: Sat Jun 09, 2012 1:04 am |
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One little comment on the loops. If 'i' is an in8 (default 'int' size), then the loops will never terminate.
When an int8 counts, it wraps at the end. So:
254
255
0
1
2
etc..
This will always be <=255......
Best Wishes |
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will
Joined: 28 May 2012
Posts: 24
Location: france
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| Posted: Sat Jun 09, 2012 2:47 am |
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| yes I try to put 16 bits in the eeprom. I put the complete code. This is a remote controlled robot using infrared (RC5). |
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will
Joined: 28 May 2012
Posts: 24
Location: france
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| Posted: Thu Jun 14, 2012 1:53 pm |
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| hello I can not exit the loop, how to proceed, thank you |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Thu Jun 14, 2012 1:59 pm |
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| Quote: | | hello I can not exit the loop, how to proceed, thank you |
Ttelmah told you:
| Quote: | | If 'i' is an in8 (default 'int' size), then the loops will never terminate. |
So, what is the next larger data type than 'int8' ? What is the next size ?
Look in the CCS manual and answer that question. Then change your
declaration of 'i' to the next larger size.
http://www.ccsinfo.com/downloads/ccs_c_manual.pdf
Look in this section:
| Quote: | | Basic and Special types |
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Gabriel
Joined: 03 Aug 2009
Posts: 1067
Location: Panama
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| Posted: Thu Jun 14, 2012 2:27 pm |
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this was funny....
_________________
CCS PCM 5.078 & CCS PCH 5.093 |
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will
Joined: 28 May 2012
Posts: 24
Location: france
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| Posted: Fri Jun 15, 2012 7:51 am |
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[quote="PCM programmer"][quote]
Ttelmah told you:
| Quote: | | If 'i' is an in8 (default 'int' size), then the loops will never terminate. |
yes I know, I did see his message but 'i' is long! So I do not see or come to the problem.
watching:
int mot_commande[] = {0, 0, 0, 0};
long donnee[128], i=0;
char variable;
long variable2;
int mot_effectue = 10;
int vitesse = 5;
long time=0;
thank |
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Gabriel
Joined: 03 Aug 2009
Posts: 1067
Location: Panama
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| Posted: Fri Jun 15, 2012 8:19 am |
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Edit**nevermind...
try printing out the value of "i" to serial... see what its doing.
_________________
CCS PCM 5.078 & CCS PCH 5.093 |
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will
Joined: 28 May 2012
Posts: 24
Location: france
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| Posted: Wed Jun 20, 2012 7:04 am |
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hello
Sorry I can not display it.
Yet I have always not solved my problem.
I have two dc motors that I control via infrared (RC5) I have two push buttons, one to store, the other to play again. I stored the data length and direction in the eeprom but I can not do it. if someone can help me as impossible.
| Code: |
int mot_commande[] = {0, 0, 0, 0}; // {MOT_D_AV, MOT_D_AR, MOT_G_AV, MOT_G_AR} [0, 10]
long donnee[128], i=0;
char variable;
long variable2;
int mot_effectue = 10; // [0, 10]
int vitesse = 5;
long time=0;
void fonction_memory() {
for(i=0;i<=255;++i)
{
variable=donnee[i];
write_eeprom(i, variable2);
donnee[i]=donnee[i]>>8;
variable=donnee[i];
i=i+1;
write_eeprom(i, variable);
}
}
void fonction_repeat() {
for(i=0;i<=255;++i)
{
variable=read_eeprom(i);
donnee[i]=variable;
i=i+1;
variable2=read_eeprom(i);
variable2=variable2<<8;
donnee[i]=donnee[i]||variable2;
}
}
void fonction_decode() {
for(i=0;i<=255;++i)
{
variable=donnee[i];
variable=variable&&7;
switch(variable) {
case 1:
mot_avancer();
delay_ms(500);
break;
case 2:
mot_reculer();
delay_ms(500);
break;
case 3:
mot_arreter();
delay_ms(500);
break;
case 4:
mot_rotation_gauche();
delay_ms(500);
break;
case 5:
mot_rotation_droite();
delay_ms(500);
break;
case 6:
mot_virage_gauche();
delay_ms(500);
break;
case 7:
mot_virage_droite();
delay_ms(500);
break;
default:
break;
}
variable2=donnee[i];
variable2=variable2>>3;
time=0;
while(time!=variable2);
}
}
//////PROGRAMMME
while (input(REC_IR) == 1) // Attend bit de START
{
if(input(PIN_C7))
{
fonction_memory();
output_high(LED_VERTE);
}
if(input(PIN_C5))
{
fonction_repeat();
fonction_decode();
}
}
switch(commande) {
case CODEIR_AV:
mot_avancer();
donnee[i]=donnee[i]+1; //// ICI
delay_ms(500);
break;
case CODEIR_AR:
mot_reculer();
donnee[i]=donnee[i]+2; ////ICI
delay_ms(500);
break;
case CODEIR_ST:
mot_arreter();
time=time<<3;
donnee[i]=donnee[i]||time; ///// TIME
time=0;
i++;
delay_ms(500);
break;
case CODEIR_RG:
mot_rotation_gauche();
donnee[i]=donnee[i]+4; /// ICI
delay_ms(500);
break;
case CODEIR_RD:
mot_rotation_droite();
donnee[i]=donnee[i]+5; ///ICI
delay_ms(500);
break;
case CODEIR_VG:
mot_virage_gauche();
donnee[i]=donnee[i]+6; //// ICI
delay_ms(500);
break;
case CODEIR_VD:
mot_virage_droite();
donnee[i]=donnee[i]+7; //////////ICI
delay_ms(500);
break;
default:
break;
}
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Last edited by will on Wed Jun 20, 2012 8:34 am; edited 1 time in total |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19540
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| Posted: Wed Jun 20, 2012 8:08 am |
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Just going through the write routine - comments inline.
| Code: |
void fonction_memory(void) {
for(i=0;i<=255;++i) {
variable=donnee[i];
//i is moving forwards by _2_ every loop - you increment both in the for
//and at the end of the loop. You will access donnee[0], then donnee[2].
write_eeprom(i, variable2);
//Er. You have put the LSB of the value into variable, then write
//variable2.....
donnee[i]=donnee[i]>>8;
//Do you mind that this will destroy the stored value?.
variable=donnee[i];
i=i+1;
write_eeprom(i, variable);
}
}
//Alternative:
void fonction_memory(void) {
long val;
int index;
for(i=0;i<128;i++) {
index=i*2;
val=donnee[i]; //Will access values from locations 0 to 127.
write_eeprom(index, make8(val,0)); //LSB
write_eeprom(index+1,make8(val,1)); //MSB Write the two bytes
}
}
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You probably have similar problems elsewhere - haven't looked.
Best Wishes |
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will
Joined: 28 May 2012
Posts: 24
Location: france
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| Posted: Wed Jun 20, 2012 8:37 am |
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pffffffffff a big thank
and then you can not help me fix because I'm lost ..
a big thank you and sorry .. |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19540
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| Posted: Wed Jun 20, 2012 8:48 am |
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| I have posted a fixed version for this function. Look for similar mistakes elsewhere. |
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will
Joined: 28 May 2012
Posts: 24
Location: france
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| Posted: Wed Jun 20, 2012 10:02 am |
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thank ,
why do you * 2? => index = i * 2 |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19540
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| Posted: Wed Jun 20, 2012 11:39 am |
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Because 'i', addresses an array of int16's, and it takes two bytes of the EEPROM to store an int16. Hence two writes for each value in 'i', and the byte address used has to be 2*i.
This is the core problem from the start of the thread. Even if you used the CCS code to write an int16, the _address_ must move forward by 2 for each value written.
Best Wishes |
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