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ye
Joined: 11 May 2005
Posts: 57
Location: london
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| code halted by setup_timer_0() |
 Posted: Mon Nov 21, 2005 6:59 am |
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Hi all,
I have the little code below working on PIC10F200. Somehow the code is suspended by setup_timer_0(). I knew that by hooking a LED to pin 'PSU_EN'.
The code is here:
| Code: | #include<10F200.h>
#fuses NOMCLR,NOWDT,NOPROTECT
#use delay( clock = 4000000 )
#bit PSU_EN = 0x06.0 // Output signal to power control circuit
#bit POWER_OFF = 0x06.1 // Input signal from main pic for indication of system status
#bit POWER_SW = 0x06.2 // Input signal from the power on button
#bit USB_SW = 0x06.3 // Input signal from USB
#use fast_io(B)
//Otherwise the compiler will want to control the TRIS
void main()
{
int timer_value;
int ellapsed_time = 0;
/////////////////////////////////////////////////////////////////////////////////////////
// Setup the timer which support a counting of at least 5 seconds //
// The timer register is 8 bit and the prescaler register is 8 bit long as well //
// Use the longest overflow time here and the timer overflows every: //
// //
// (4 * 256 / 4000000) * 256 = 665536 us = 0.67 s //
// //
// where first 256 is the prescaler value, the second 256 the timer value. //
// and 4 is from 'Fosc/4' and 4000000 is the internal clock speed //
// //
// NOTE: the product given by the bracket is 256 us which is the clock tick period //
/////////////////////////////////////////////////////////////////////////////////////////
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_256);
set_tris_b(0b00001110); //Remember B3, must be an input.
while(1)
{
PSU_EN = 1;
delay_ms(500);
PSU_EN = 0;
delay_ms(500);
}
/////////////////////// Other code ////////////////////////
} |
Can you see any problem here at all?
Thx |
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Humberto
Joined: 08 Sep 2003
Posts: 1215
Location: Buenos Aires, La Reina del Plata
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| Posted: Mon Nov 21, 2005 10:43 am |
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Your code is a simple test and doesnīt show any clue that will cause the described problem.
I would spot the troubleshoot in a hardware problem.
You had some problems when you start working with the PIC10F200,
( A problem about PIC10F200
Posted: Fri Nov 18, 2005 7:55 am )
where you didnīt save the factory OSCCAL register values at power up.
@Ttelmath direct you how to proceed regarding this. My questions are:
1) Are you working with the same PIC ?
2) If so, whatīs the actual value of OSCCAL ?
3) Did you try with another PIC ?
4) What about your DC power quality, decoupler capacitor and the involved wiring ?
Best wishes,
Humberto |
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ye
Joined: 11 May 2005
Posts: 57
Location: london
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| Posted: Mon Nov 21, 2005 11:16 am |
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Thx.
I think I've figured out the problem. In MPLAB I set MCLR as 'functions as GP3' and then it worked. I don't really know why here but I suppose it has something to do with the programmer?
Yes,I am working on the same pic. Actually, I have a better version of code and I would like to post it here:
| Code: | #include<10F200.h>
#fuses NOWDT,NOPROTECT
#use delay( clock = 4000000 )
#bit PSU_EN = 0x06.0 // Output signal to power control circuit
#bit POWER_OFF = 0x06.1 // Input signal from main pic for indication of system status
#bit POWER_SW = 0x06.2 // Input signal from the power on button
#bit USB_SW = 0x06.3 // Input signal from USB
#bit OSCCAL_0 = 0x05.0 // define bit 0 of OSCCAL register
#use fast_io(B) //Otherwise the compiler will want to control the TRIS
void main()
{
int timer_value,powerOn = 0;
int ellapsed_time = 0;
int i =0;
/////////////////////////////////////////////////////////////////////////////////////////
// Setup the timer which support a counting of at least 5 seconds //
// The timer register is 8 bit and the prescaler register is 8 bit long as well //
// Use the longest overflow time here and the timer overflows every: //
// //
// (4 * 256 / 4000000) * 256 = 665536 us = 0.67 s //
// //
// where first 256 is the prescaler value, the second 256 the timer value. //
// and 4 is from 'Fosc/4' and 4000000 is the internal clock speed //
// //
// NOTE: the product given by the bracket is 256 us which is the clock tick period //
/////////////////////////////////////////////////////////////////////////////////////////
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_256);
// Set TRIS states. GP3 must always work as INPUT.
set_tris_b(0b11111110);
// The following assembly disables portb pull ups. There is no straight default C code to do this.
// It actually set bit 6 of OPTION register which disables week pull-ups at GP0, GP1 and GP3
#asm
movlw 0b11010111
option
#endasm
// Disable bit 0 of OSCCAL register
// Setting this bit will make GP2 work as INTOSC/4 output
// Clearing it will allow GP2 work as I/O
OSCCAL_0 = 0;
////////////////// other code /////////////////////
}
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Thanks |
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