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Eleengnrng
Joined: 21 Apr 2006
Posts: 6
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| RTC Issue with PIC16F877A |
 Posted: Wed Sep 13, 2006 2:17 pm |
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Ok here is the issue i am using a 20Mhz clock and i am using timer one on to count the number of clock cycles to equal 1 second. no problem there. once a complet minute happens it enter a function that decraments the a value and displays on a seven gegment display. the issue is that some where when i tell it to start to count down it hangs up when switching back and forth from some set conditions. BELOW IS A BUNCH OF CODE. HELP IS NEED FAST.
| Code: |
#include <16F877A.h>
#device adc=8
#FUSES NOWDT, HS, PUT, NOPROTECT, NODEBUG, NOBROWNOUT, NOLVP, NOCPD, NOWRT
#use delay(clock=20000000)
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdlibm.h>
#define Timer_LOC 0x00 // Timer data Location 5
#define Temp_LOC 0x06 // Temp Data Location 10 EEprom
#define XTAL_FREQUENCY 20000000
#define TIMER1_FREQUENCY (XTAL_FREQUENCY / 4) // 1 clock tick = 1 instr. cycle = crystal frequency / 4
/**************************************************************************/
/* Global Variables */
/**************************************************************************/
int8 STSP=0,digit,sec=0,tempsetp=0,tempsetpm,acttemp=0;
int8 offsethigh,offsetlow,timera,timerb,timerval = 0;
int32 Ticker;
int8 Seconds=0, Choice=1, rawtemp;
int32 dispR = 458752, dispH = 1245184;
/**************************************************************************/
/* Functions & Function Delcarations */
/**************************************************************************/
void Initialize_RTC(void)
{
if (Choice == 1)
{
Ticker = TIMER1_FREQUENCY-dispR; // initialize clock counter to number of clocks per second
}
if (Choice == 2)
{
Ticker = TIMER1_FREQUENCY-dispH; // initialize clock counter to number of clocks per second
}
setup_timer_1( T1_INTERNAL | T1_DIV_BY_1 ); // initialize 16-bit Timer1 to interrupt
// exactly every 65536 clock cycles
// (about 76 times per second)
enable_interrupts( INT_TIMER1 ); // Start RTC
}
void Scroll_MSG(); // look at end of the code beyond Main Program
void Ready_MSG(); // look at end of the code beyond Main Program
//void digman(int8 value, int8 dvalue); //look at end of code beyond main program
/**************************************************************************/
/* END Functions & Function Delcarations */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/* Interupts Section Begins */
/**************************************************************************/
#int_RB
void RB_isr(){
//MONITORS SOME BUTTONS
}//Port b on change int routine for temp setting
/*****************************************************************************/
/* External interupt */
/*****************************************************************************/
#int_EXT
Void Ext_isr(){
disable_interrupts(INT_EXT);
delay_ms(100);
digit=timerval;//input timer data
delay_ms(10);
If ((STSP==0)&&(input(PIN_B0)==0)){//if equal to 0 then its in start mode
if ((STSP == 0)&&(input(PIN_B0)==0)){
stsp=stsp+1;//increment stsp
digman(digit,0);//load dig manipulation function with timer data
//output_low(Pin_A4);//turn timer buzzer off
Initialize_RTC();
lcd_goto(2,16);
printf(write_LCD,"%c",0x78);
}
}else if ((STSP!=0)&&(input(PIN_B0)==0)){//if equal to 1 then its in stop mode
digman(digit,0);//load dig manipulation function with timer data
stsp=0;//set STSP back to start position
disable_interrupts( INT_TIMER1 ); // disable RTC
timerval = digit;
lcd_goto(2,16);
printf(write_LCD,"%c",0x20);
output_C(timerval);
output_low(Pin_A4);//turn off buzzer
}
enable_interrupts(INT_EXT);
}//External int routine for Timer
/*****************************************************************************/
/* Timer 1 Interupt */
/*****************************************************************************/
#int_TIMER1
void TImer1_isr()
{
disable_interrupts(INT_TIMER1);
Ticker -= 65536; // Decrement ticker by clocks per interrupt
if ( Ticker < 65536 ) // If second has expired
{ Ticker += TIMER1_FREQUENCY; // Increment ticker by clocks per second
seconds++; // Increment number of seconds
Initialize_RTC();
}
if (Choice == 1){
if((Seconds == 60)) {digman(0,1); Seconds=0;}
}
if (Choice == 2){
if((Seconds == 30)) {digman(0,1); Seconds=0;}
}
enable_interrupts(INT_TIMER1);
} // End of timer 1 interup
#int_TIMER2
Void TIMER2_ISR(){
disable_interrupts(INT_TIMER2);
rawtemp = tempact();
acttemp = rawtemp;
/* if (rawtemp<=70){
acttemp = rawtemp-10;
}else if (rawtemp>70){
acttemp = rawtemp;
}*/
/*rawtemp = tempact();
if (rawtemp > acttemp+3){
acttemp = tempact();
}else if ((rawtemp < acttemp-3) && (acttemp != 0)){
acttemp = tempact();
}**/
enable_interrupts(INT_TIMER2);
}
/***************************************************************************/
/* End Of Interupt Section */
//*************************************************************************//
//*************************************************************************//
//*************************************************************************//
//*************************************************************************//
/* Begin Main Program */
/***************************************************************************/
void main()
{
SET_TRIS_A (0x01); //set reg a for temp sensor input
SET_TRIS_B (0xf1); //Misc Data Pins
SET_TRIS_C (0x00); //Set Port C to Outputs
SET_TRIS_D (0x00); //LCD Data Port
SET_TRIS_E (0x00); //LCD Control Port
port_b_pullups(TRUE);
setup_adc_ports(RA0_ANALOG);
setup_adc(ADC_CLOCK_DIV_32);
setup_psp(PSP_DISABLED);
setup_spi(FALSE);
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
//setup_timer_1(T1_INTERNAL|T1_DIV_BY_1);
setup_timer_2(T2_DIV_BY_16,240,13);
ext_int_edge(H_TO_L);//activate on high to low
enable_interrupts(INT_RB);
enable_interrupts(INT_EXT);
enable_interrupts(INT_TIMER1);
enable_interrupts(INT_TIMER2);
enable_interrupts(GLOBAL);
LCD_init();//Intilize the LCD Display
set_adc_channel(0);//set A-D converter channel to 0
output_low(Pin_A4);//turn buzzer off
if (READ_EEPROM(Timer_LOC) != 0xff)
timerval = READ_EEPROM(Timer_LOC);
if (READ_EEPROM(Temp_LOC) != 0xff)
tempsetp = READ_EEPROM(Temp_LOC);
set_tris_c(0x00);//set port c for all outputs
output_c(timerval);
delay_ms(10);
While(True){
lcd_goto(1,1);
printf(write_LCD,"%3u",tempsetp);//Display the temperature set point
lcd_goto(1,4);
printf(write_lcd,"%c",0x0df); //degree symbol
lcd_goto(1,5);
printf(write_lcd,"%c",0x43); //Celcius
offsethigh=tempsetp+3;
if (tempsetp != 0)
{offsetlow=tempsetp-6;}
lcd_goto(1,12);
printf(write_LCD,"%3u",acttemp);//Display the temperature
lcd_goto(1,15);
printf(write_lcd,"%c",0x0df); //degree symbol
lcd_goto(1,16);
printf(write_lcd,"%c",0x43); //Celcius
if (STSP==0) {output_c(timerval);} //output Timer Val if timer not active
if (acttemp>=tempsetp&&acttemp<offsethigh){
output_low(Pin_A5);
Choice = 1;
ready_msg();
}else if (tempsetp == 0){
output_low(Pin_A5);
Choice = 1;
ready_msg();
}else if ((acttemp==tempsetp)||(acttemp>offsetlow)){
output_low(Pin_A5);
Choice = 1;
ready_msg();
}else if (acttemp<=offsetlow){
while (acttemp<=offsethigh){
output_high(Pin_A5);
Choice = 2;
scroll_msg();
lcd_goto(1,1);
printf(write_LCD,"%3u",tempsetp);//Display the temperature set point
lcd_goto(1,4);
printf(write_lcd,"%c",0x0df); //degree symbol
lcd_goto(1,5);
printf(write_lcd,"%c",0x43); //Celcius
offsethigh=tempsetp+3;
if (tempsetp != 0)
{offsetlow=tempsetp-6;}
lcd_goto(1,12);
printf(write_LCD,"%3u",acttemp);//Display the temperature
lcd_goto(1,15);
printf(write_lcd,"%c",0x0df); //degree symbol
lcd_goto(1,16);
printf(write_lcd,"%c",0x43); //Celcius
}
}
/* if ((decval == 0)&&(STSP == 1)){
output_high(PIN_A4);
delay_ms(8000);
}*/
if (read_eeprom(Timer_LOC) != timerval)
{write_eeprom(Timer_LOC,timerval);}
if (read_eeprom(Temp_LOC) != tempsetp)
{write_eeprom(Temp_LOC,tempsetp);}
}
} // End Of Main ***************************************************************
/***************************************************************************/
/* End Of Main */
//*************************************************************************//
//*************************************************************************//
//*************************************************************************//
//*************************************************************************//
/* Begin LCD Functions */
/***************************************************************************/
void Scroll_MSG(){
//DISPLAYS HEATING MESSAGE
}//eng of scroll function
void Ready_MSG(){
// DISPLAYS READY MESSAGE
}// End of Ready Function
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I left out chunks of code becasue i think that it not part of my problem and i only want.
Last edited by Eleengnrng on Wed Sep 13, 2006 3:11 pm; edited 1 time in total |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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Eleengnrng
Joined: 21 Apr 2006
Posts: 6
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| Posted: Wed Sep 13, 2006 2:46 pm |
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yes i have seen this code and modled my code after it. it works great the problem is that it seems to hang up when the main part of the function which i sum how cut out switchs betuween ready and scroling msg.
here is the missing Main Code.
| Code: |
//*************************************************************************//
/* Begin Main Program */
/***************************************************************************/
void main()
{
SET_TRIS_A (0x01); //set reg a for temp sensor input
SET_TRIS_B (0xf1); //Misc Data Pins
SET_TRIS_C (0x00); //Set Port C to Outputs
SET_TRIS_D (0x00); //LCD Data Port
SET_TRIS_E (0x00); //LCD Control Port
port_b_pullups(TRUE);
setup_adc_ports(RA0_ANALOG);
setup_adc(ADC_CLOCK_DIV_32);
setup_psp(PSP_DISABLED);
setup_spi(FALSE);
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
//setup_timer_1(T1_INTERNAL|T1_DIV_BY_1);
setup_timer_2(T2_DIV_BY_16,240,13);
ext_int_edge(H_TO_L);//activate on high to low
enable_interrupts(INT_RB);
enable_interrupts(INT_EXT);
enable_interrupts(INT_TIMER1);
enable_interrupts(INT_TIMER2);
enable_interrupts(GLOBAL);
LCD_init();//Intilize the LCD Display
set_adc_channel(0);//set A-D converter channel to 0
output_low(Pin_A4);//turn buzzer off
if (READ_EEPROM(Timer_LOC) != 0xff)
timerval = READ_EEPROM(Timer_LOC);
if (READ_EEPROM(Temp_LOC) != 0xff)
tempsetp = READ_EEPROM(Temp_LOC);
set_tris_c(0x00);//set port c for all outputs
output_c(timerval);
delay_ms(10);
While(True){
lcd_goto(1,1);
printf(write_LCD,"%3u",tempsetp);//Display the temperature set point
lcd_goto(1,4);
printf(write_lcd,"%c",0x0df); //degree symbol
lcd_goto(1,5);
printf(write_lcd,"%c",0x43); //Celcius
offsethigh=tempsetp+3;
if (tempsetp != 0)
{offsetlow=tempsetp-6;}
lcd_goto(1,12);
printf(write_LCD,"%3u",acttemp);//Display the temperature
lcd_goto(1,15);
printf(write_lcd,"%c",0x0df); //degree symbol
lcd_goto(1,16);
printf(write_lcd,"%c",0x43); //Celcius
if (STSP==0) {output_c(timerval);} //output Timer Val if timer not active
if (acttemp>=tempsetp&&acttemp<offsethigh>offsetlow)){
output_low(Pin_A5);
Choice = 1;
ready_msg();
}else if (acttemp<=offsetlow){
while (acttemp<=offsethigh){
output_high(Pin_A5);
Choice = 2;
scroll_msg();
lcd_goto(1,1);
printf(write_LCD,"%3u",tempsetp);//Display the temperature set point
lcd_goto(1,4);
printf(write_lcd,"%c",0x0df); //degree symbol
lcd_goto(1,5);
printf(write_lcd,"%c",0x43); //Celcius
offsethigh=tempsetp+3;
if (tempsetp != 0)
{offsetlow=tempsetp-6;}
lcd_goto(1,12);
printf(write_LCD,"%3u",acttemp);//Display the temperature
lcd_goto(1,15);
printf(write_lcd,"%c",0x0df); //degree symbol
lcd_goto(1,16);
printf(write_lcd,"%c",0x43); //Celcius
}
}
/* if ((decval == 0)&&(STSP == 1)){
output_high(PIN_A4);
delay_ms(8000);
}*/
if (read_eeprom(Timer_LOC) != timerval)
{write_eeprom(Timer_LOC,timerval);}
if (read_eeprom(Temp_LOC) != tempsetp)
{write_eeprom(Temp_LOC,tempsetp);}
}
} // End Of Main ***************************************************************
/***************************************************************************/
/* End Of Main */
//*************************************************************************//
//*************************************************************************//
//*************************************************************************//
//*************************************************************************//
/* Begin LCD Functions */
/***************************************************************************/
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Sorry for the length in code but this problem has been aggravating and persistant every time i think that i have fixed it it appears again. so there is something that i am missing. I am figureing that a new pair of eys will help the problem out. thanks for any assistance. |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Wed Sep 13, 2006 2:57 pm |
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Can you edit your first post, and re-post the code, but this time click
on the box below the posting that says:
| Code: | | X Disable HTML in this post |
The reason is that if you leave HTML turned on, then all lines of code
that have "greater than", and "less than", etc., get messed up.
For example, the "TImer1_isr()" code is screwed up.
Also, after you've done that, can you post a short comment on
exactly what line of code does it hang up on. |
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ckielstra
Joined: 18 Mar 2004
Posts: 3680
Location: The Netherlands
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| Posted: Wed Sep 13, 2006 3:28 pm |
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| You didn't post the code of your interrupt handlers. I see you enable 4 interrupts, please make sure you implemented functions for handling these interrupts. The compiler will not complain about a missing interrupt function, but when the interrupt occurs (accidently) it will not get cleared and loop forever; the PIC appears to stall. |
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