| View previous topic :: View next topic |
| Author |
Message |
rrb011270
Joined: 07 Sep 2003
Posts: 51
|
| Buzzer Routine Help |
 Posted: Mon Dec 22, 2003 7:28 pm |
 |
|
Mabuhay!
My buzzer routine below:
output_high(BUZZER);
delay_ms(200);
output_low(BUZZER);
delay_ms(450);
Is there another way such that I can use interrupt driven o reduce the instruction cycle of this routine?
My application is an RF reader which use an #int_ext2 to capture the ID from the badge. When it is successfull a buzzer will sound for success.
most of my code use the interrupt handler routine like the clock which use the #int_timer0 such it will capture the time and date and added to a complete packet of data which are compose of date, time, RFid, etc...
Any help will do?
Tenkyu |
|
 |
Mark
Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA
|
|
|
rrb011270
Joined: 07 Sep 2003
Posts: 51
|
|
| Posted: Tue Dec 23, 2003 12:24 am |
|
|
Yes would output for a duration only? Need Help? |
|
|
Mark
Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA
|
|
| Posted: Tue Dec 23, 2003 8:01 am |
|
|
I like to use timer2 as a 1ms tick. Most of my software timers are based in milliseconds.
| Code: |
#include <18F452.h> // Target PIC Microcontroller IC
#device *=16 // use a 16-bit pointer
#device ICD=TRUE
#fuses HS,NOPROTECT,NOLVP,NOWDT // PIC MCU Configuration
#use delay(clock=20000000) // 20MHz Crystal clock speed
// Configure PortA4 for buzzer output
#bit BUZZER=0xF80.4
int Buzzer_Timer = 0;
#int_timer2
void tick(void)
{
if (Buzzer_Timer)
{
Buzzer_Timer--;
if (!Buzzer_Timer)
{
output_high(BUZZER);
}
}
}
void Beep(void)
{
Buzzer_Timer = 200;
output_low(BUZZER);
}
main()
{
// Setup timer2 for 1ms intervals
setup_timer_2(T2_DIV_BY_4,250,5);
enable_interrupts(int_timer2);
enable_interrupts(global);
Beep();
while (1) ;
}
|
|
|
|
rrb011270
Joined: 07 Sep 2003
Posts: 51
|
|
| Posted: Sun Dec 28, 2003 6:56 pm |
|
|
This is what I did for timer2:
| Code: |
#include <18F452.h> // Target PIC Microcontroller IC
#device *=16 // use a 16-bit pointer
#fuses HS,NOPROTECT,NOWDT // PIC MCU Configuration
#use delay(clock=20000000) // 20MHz Crystal clock speed
#define BUZZER PIN_A4 // buzzer to PortA4
#int_timer2
timer2_isr()
{
if (glBuzzerFlag) // check if buzzer flag bit enable
{
if (buzzcnt >= 11)
{
output_high(BUZZER); // buzzer turn-off
glBuzzerFlag = 0; // reset flag bit
}
buzzcnt++;
}
if (glBuzzerError) // check if buzzer error flag bit enable
{
if ((buzzcnt >=11) && (buzzcnt < 21))
output_high(BUZZER); // turn-off buzzer for ~130msec.
if ((buzzcnt >= 21) && (buzzcnt < 31))
output_low(BUZZER); // turn-on buzzer for ~130msec.
if (buzzcnt >= 31)
{
output_high(BUZZER); // buzzer turn-off
glBuzzerError = 0; // reset flag bit
}
buzzcnt++;
}
}
void buzzSound() // buzzer sounder routine
{
output_low(BUZZER); // turn ON buzzer
buzzcnt = 0; // set buzzer time in 100mS per count
}
void init_chip() { // Initialize the MCU Chip
setup_adc_ports(NO_ANALOGS);
setup_timer_2(T2_DIV_BY_16,0xFF,16); // 6.56mS interupt interval
enable_interrupts(int_timer2); // Enable timer2 interrupt
enable_interrupts(GLOBAL); // Enable Global interrupt
}
|
Thank u for the help... |
|
|
|
FAQ 
Search
Register
Profile 
Log in to check your private messages 
Log in
