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ajshah23
Joined: 16 Jun 2006
Posts: 3
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| Need help with interrupts!! |
 Posted: Thu Jul 13, 2006 7:41 pm |
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These interrupts are becoming very frustrating! Can someone PLEASE help??
The function of the circuit is to display characters on an LCD when a pushbutton is pressed and held down, and to turn on an RFID reader antenna when the button is released. The reader and LCD work fine separately. Here is what I have so far, but only the display works :(
| Code: | #include <16F877>
#fuses HS,NOWDT,NOPROTECT,NOLVP, NOBROWNOUT
#use delay(clock=20000000)
#USE RS232(BAUD=9600, XMIT=PIN_C6,RCV=PIN_C7, bits=8, PARITY=N)
#include <lcd>
#include <input>
#rom 0x2100={1,2,3,4}
#use fast_io(B)
#define IRX_B_TRIS 0b10000010
#define DOOR_BUTTON PIN_B0
//#byte PORTD = 8
//#define ALL_OUT 0
// global flag to send processor into sleep mode
short sleep_mode;
// external interrupt when button pushed and released
#INT_EXT
void ext_isr() {
static short button_pressed=FALSE;
if(!button_pressed) // if button action and was not pressed
{
button_pressed=TRUE; // the button is now down
sleep_mode=TRUE; // activate sleep
//printf("The processor is now sleeping.\r\n");
ext_int_edge(L_TO_H); // change so interrupts on release
}
else // if button action and was pressed
{
button_pressed=FALSE; // the button is now up
sleep_mode=FALSE; // reset sleep flag
ext_int_edge(H_TO_L); // change so interrupts on press
}
if(!input(PIN_B0)) // keep button action sychronized wth button flag
button_pressed=TRUE;
delay_ms(100); // debounce button
}
int checkid();
void main() {
do{
int m;
int lcd_on;
int lcd_off;
int startaddr;
int milkaddr = 0001;
int breadaddr = 0002;
int juiceaddr = 0003;
int endaddr = 0003;
int freq = 0001;
//sleep_mode=TRUE;
ext_int_edge(H_TO_L); // init interrupt triggering for button press
enable_interrupts(INT_EXT);// turn on interrupts
enable_interrupts(GLOBAL);
set_tris_b(IRX_B_TRIS);
if(sleep_mode==FALSE){
while(sleep_mode==FALSE){
do{
m = checkid();//this will return an integer m
}while(m==0);
//LCD should be initialzed here to indicate that something was removed/replaced
if(m==1)
{
if(read_eeprom(milkaddr)==0001)
write_eeprom(milkaddr, 0000);
else
write_eeprom(milkaddr, freq);
}
else if(m==2)
{
if(read_eeprom(breadaddr)==0001)
write_eeprom(breadaddr, 0000);
else
write_eeprom(breadaddr, freq);
}
/*
{
delay_ms(300);
lcd_putc(" Bread ");
delay_ms(500);
lcd_putc('\f');
}
*/
else if(m==3)
{
if(read_eeprom(juiceaddr)==0001)
write_eeprom(juiceaddr, 0000);
else
write_eeprom(juiceaddr, freq);
}
}
}
else if(sleep_mode==TRUE){
lcd_init();
while(sleep_mode==TRUE){
//CODE
}
}
}while(TRUE);//end of huge do while loop right after main begins
} |
The check id funciton works fine, it is just the interrupts.
Can someone please look into this??? |
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Mark
Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA
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| Posted: Thu Jul 13, 2006 8:35 pm |
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You shouldn't have this code in the do loop
| Code: |
int m;
int lcd_on;
int lcd_off;
int startaddr;
int milkaddr = 0001;
int breadaddr = 0002;
int juiceaddr = 0003;
int endaddr = 0003;
int freq = 0001;
//sleep_mode=TRUE;
ext_int_edge(H_TO_L); // init interrupt triggering for button press
enable_interrupts(INT_EXT);// turn on interrupts
enable_interrupts(GLOBAL);
set_tris_b(IRX_B_TRIS); |
You should initialize this variable
short sleep_mode; |
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ajshah23
Joined: 16 Jun 2006
Posts: 3
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| Tried it |
| Posted: Fri Jul 14, 2006 11:05 am |
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Thank you Mark.
I tried what you said, but there was no change. The interrupt is not being called properly. Would it be a problem with disabling the interrupts??? |
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rwyoung
Joined: 12 Nov 2003
Posts: 563
Location: Lawrence, KS USA
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| Posted: Fri Jul 14, 2006 12:28 pm |
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Probably not stopping your code from running but certainly not good in an interrupt. Don't call delay_ms() in your ISR. Ties up the entire processor doing nothing, including servicing future interrupt events.
_________________
Rob Young
The Screw-Up Fairy may just visit you but he has crashed on my couch for the last month! |
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