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Table in pic16f877

 
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Marcus
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Table in pic16f877
PostPosted: Mon Feb 16, 2004 3:52 pm     Reply with quote

Did you see an error in these function. When i execute them, they didn't send my caracters but other caracters. I don't know why. Did the compilator have problems with pointers?

void main() {
//========Debut du code===========================
//** Initialisations.
setup_adc_ports(NO_ANALOGS);
setup_adc(ADC_CLOCK_DIV_2);
setup_psp(PSP_DISABLED);
setup_spi(FALSE);
setup_counters(RTCC_EXT_L_TO_H,WDT_18MS);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);
init_ext_eeprom();
set_tris_b(0x00); // Mettre le port b en sortie.
set_timer0(0xFF-8);
enable_interrupts(INT_TIMER0);
enable_interrupts(global);
output_b(0x00); // Initialiser le port b à 0.

delay_ms(1000);

EnvoyerString("Menu principal|1) Afficher l'heure|2)Modifier l'heure");
do
{
}
while(1);
}//========Fin du code===========================

void EnvoyerString(char* sChaine)
{
disable_interrupts(global);
while(*sChaine != 0)
{
delay_ms(50);
if(iEnable == 0)
{
iEnable = 1;
*sChaine = *sChaine | 0x80;
}
else
{
iEnable = 0;
*sChaine = *sChaine & 0x7F;
}
output_b(*sChaine); // Envoyer le caractère.
sChaine++;
}
enable_interrupts(global);
}
Ttelmah
Guest







Re: Table in pic16f877
PostPosted: Mon Feb 16, 2004 4:30 pm     Reply with quote

Marcus wrote:
Did you see an error in these function. When i execute them, they didn't send my caracters but other caracters. I don't know why. Did the compilator have problems with pointers?

void main() {
//========Debut du code===========================
//** Initialisations.
setup_adc_ports(NO_ANALOGS);
setup_adc(ADC_CLOCK_DIV_2);
setup_psp(PSP_DISABLED);
setup_spi(FALSE);
setup_counters(RTCC_EXT_L_TO_H,WDT_18MS);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);
init_ext_eeprom();
set_tris_b(0x00); // Mettre le port b en sortie.
set_timer0(0xFF-8);
enable_interrupts(INT_TIMER0);
enable_interrupts(global);
output_b(0x00); // Initialiser le port b à 0.

delay_ms(1000);

EnvoyerString("Menu principal|1) Afficher l'heure|2)Modifier l'heure");
do
{
}
while(1);
}//========Fin du code===========================

void EnvoyerString(char* sChaine)
{
disable_interrupts(global);
while(*sChaine != 0)
{
delay_ms(50);
if(iEnable == 0)
{
iEnable = 1;
*sChaine = *sChaine | 0x80;
}
else
{
iEnable = 0;
*sChaine = *sChaine & 0x7F;
}
output_b(*sChaine); // Envoyer le caractère.
sChaine++;
}
enable_interrupts(global);
}

This is definately a case of RTFM.
The compiler has no problems with pointers as such, _but_ you cannot have pointers to _constant_ strings (mapped in the ROM). Your declared strings are automatically of this form.

Best Wishes
Marcus
Guest







PostPosted: Tue Feb 17, 2004 8:11 am     Reply with quote

Which is the best way to resolve this error? Do a global variable? I've a little problem with global variable, my ram is full if my string is too long.
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