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madeiras
Joined: 12 Feb 2008
Posts: 14
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| 18f4550 AND TIMERS |
 Posted: Mon Sep 15, 2008 10:08 am |
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Hello everybody!
I need help once more, I have a external interrupt, (INT_EXT2). I want to do the following: The PIC must wake from minute to minute and do the interrupt code, but I don´t know how to do it. Wake every minute and do the code in interrupt.
In my code i have this:
| Code: | #include <18F4550.h>
#DEVICE ADC=8
#fuses HSPLL,NOWDT,NOPROTECT,NOLVP,NODEBUG,USBDIV,PLL5,CPUDIV1,VREGEN
#use delay(clock=48000000)
#include <usb_cdc.h> //USB CALL
/********************************** LCD ***************************************/
#define RS_LCD PIN_D1
#define CSB_LCD PIN_D0
#bit IDLEN=0xFD3.7 //SLEEP MODE
unsigned char valorADC;
unsigned char RB2;
unsigned char RB3;
unsigned char MSB;
unsigned char controlo;
unsigned char string[18];
unsigned char tempoSleep;
unsigned char modo_Vref; //VREF a guardar na memória EEPROM da PIC
Unsigned char canal_1,canal_2,canal_3,canal_4,canal_5,canal_6,canal_7,canal_8; //Canais a amostrar
unsigned char canal1,canal2,canal3,canal4,canal5,canal6,canal7,canal8;
unsigned char auxcanal1,auxcanal2,auxcanal3,auxcanal4,auxcanal5,auxcanal6,auxcanal7,auxcanal8; //variáveis auxiliares para guardar tempos amostragem
#INT_EXT2 // External interrupt #2
void temp_amostras()
{
if(canal1==0)
{
auxcanal1 = canal1;
//guarda na EEPROM os dados
}
if(canal2==0)
{
auxcanal2 = canal2;
//guarda na EEPROM os dados
}
if(canal3==0)
{
auxcanal3 = canal3;
}
if(canal4==0)
{
auxcanal4 = canal4;
}
if(canal5==0)
{
auxcanal5 = canal5;
}
if(canal6==0)
{
auxcanal6 = canal6;
}
if(canal7==0)
{
auxcanal7 = canal7;
}
if(canal8==0)
{
auxcanal8 = canal8;
}
auxcanal1--;auxcanal2--;auxcanal3--;auxcanal4--;auxcanal5--;auxcanal6--;auxcanal7;auxcanal8--;
}
...
void main(){
enable_interrupts(INT_EXT2);
enable_interrupts(GLOBAL);
ext_int_edge( 2,H_TO_L ); // Nivel lógico da interrupção
IDLEN=1;
//*********************EEPROM************************************************
if(read_eeprom(0x00)==0xFF){
modo_Vref=5;
}
else{
modo_Vref=read_eeprom (0x00);
}
lcd_clear();
potDigital(modo_Vref);//teste
setup_adc(ADC_CLOCK_INTERNAL);
setup_adc_ports(AN0_TO_AN7|VSS_VDD);
setup_spi(SPI_MASTER|SPI_H_TO_L|SPI_XMIT_L_TO_H|SPI_CLK_DIV_64);
output_high(CS_ADC); //CS ADC externo a 1
start_ds1305();
lcd_setup();
//----------------------------------MENUS-------------------------------------
do
{
menu_inicial();
menu_aux();
if (tempoSleep==1)
sleep();
}while(true);
}
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Mon Sep 15, 2008 3:19 pm |
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| Quote: | | Wake every minute and do the code in interrupt. |
Do you have a signal on the INT2 pin of the 18F4550 that has a
rising edge once per minute ? Describe the signal on the INT2 pin.
What is the frequency of this signal ? |
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madeiras
Joined: 12 Feb 2008
Posts: 14
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| Posted: Tue Sep 16, 2008 7:14 am |
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| PCM programmer wrote: | | Quote: | | Wake every minute and do the code in interrupt. |
Do you have a signal on the INT2 pin of the 18F4550 that has a
rising edge once per minute ? Describe the signal on the INT2 pin.
What is the frequency of this signal ? |
I want to plug to INT2 PIN an RTC (http://datasheets.maxim-ic.com/en/ds/DS1305.pdf). My RTC has 2 alarms, but i only can define an hour to him wakeup. I want that he give a signal every minute to INT2 PIN, but i don´t know to do it.
I´ve read about timers of PIC. I could use them instead? But I don´t know how to put them given an interrupt every minute.
Tk´s, I'm new on these things, and I'm learning by myself using this! |
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