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pisti66
Joined: 03 Jun 2011
Posts: 7
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| Pic18f2520 INTRC setting |
 Posted: Thu May 10, 2012 7:46 am |
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Hello,
I would like to use the internal oscillator of the chip running at 32 MHz.
I wasn't able to set it.
Here is my code:
| Code: |
#include <18F2520.h>
#device HIGH_INTS=TRUE adc=8
//#FUSES INTRC_IO //Internal RC Osc, no CLKOUT
#FUSES INTRC //Internal RC Osc
#FUSES NOWDT //No Watch Dog Timer
#FUSES WDT128 //Watch Dog Timer uses 1:128 Postscale
#FUSES NOIESO //Internal External Switch Over mode disabled
#FUSES PUT //Power Up Timer
#FUSES NOBROWNOUT //No brownout reset
#FUSES NOPBADEN //PORTB pins are configured as digital I/O on RESET
#FUSES NOLPT1OSC //Timer1 configured for higher power operation
#FUSES NOLVP //No low voltage prgming, B3(PIC16) or B5(PIC18) used for I/O
#FUSES NOXINST //Extended set extension and Indexed Addressing mode disabled (Legacy mode)
#use delay(clock=32000000)
#use fast_io(A)
#use fast_io(B)
#use fast_io(C)
#define LED PIN_A0
#define X0 PIN_B3
#define X1 PIN_B2
#define Y0 PIN_B1
#define Y1 PIN_B0
#define X_dir PIN_B4 // X motor lépésének iránya
#define X_step PIN_B5 // X motor lépése
#define Y_dir PIN_B6 // Y motor lépésének iránya
#define Y_step PIN_B7 // Y motor lépése
#define SPI_MODE_0 (SPI_L_TO_H | SPI_XMIT_L_TO_H)
#define SPI_MODE_1 (SPI_L_TO_H)
#define SPI_MODE_2 (SPI_H_TO_L)
#define SPI_MODE_3 (SPI_H_TO_L | SPI_XMIT_L_TO_H)
int n;
//------------------------------------------------------------------------------
#int_SSP HIGH
void SSP_isr(void){
}
//------------------------------------------------------------------------------
#int_TIMER1
void TIMER1_isr(void) //
{
//disable_interrupts(INT_TIMER1);
//életjel
// n++;
// if(n>=0){
output_toggle(LED);
// n=0;
// }
//enable_interrupts(INT_TIMER1);
}
//-----------------------------------------------------------------
void main() {
setup_oscillator(OSC_32MHZ|OSC_INTRC);
setup_timer_1(T1_INTERNAL|T1_DIV_BY_1); //
setup_timer_3(T3_DISABLED | T3_DIV_BY_1);
setup_spi(SPI_SLAVE|SPI_MODE_0);
setup_ccp1(CCP_COMPARE_INT);
setup_comparator(NC_NC_NC_NC);
set_tris_a(0b100000); // 0:életjel, 5:_SS
set_tris_b(0b00001111); // B0-B3: Y1,Y0,X1,X0 B4-B7: XD,XS,YD,YS
set_tris_c(0b00011000); // 2:interrupt ki, 3:SCK, 4:SDI, 5:SDO
output_b(0);
n=0;
//enable_interrupts(INT_SSP);
//enable_interrupts(INT_TIMER1);
//enable_interrupts(GLOBAL);
while(TRUE){
output_toggle(LED);
}
}
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I measured the output pin with scope, and the led is on for 1,5us.
There is 2 instruction in the main loop, which need 8 clock.
What's wrong?
Please help me.
Regards, István |
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Mike Walne
Joined: 19 Feb 2004
Posts: 1785
Location: Boston Spa UK
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| Posted: Thu May 10, 2012 11:24 am |
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Have you looked at the assembly listing to see how many instructions are in your loop?
Have you counted two machine cycles for the jump?
Have you checked the OSCTUNE register to see if the PLLEN bit is actually being set?
To me, it looks like you are not actually setting the PLL.
Mike |
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pisti66
Joined: 03 Jun 2011
Posts: 7
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| Posted: Fri May 11, 2012 2:17 am |
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Hello,
You are right. I counted the jump only with 1 instruction cycle.
Anyway, the chip operates at 8 MHz.
Regards, István |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19545
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| Posted: Fri May 11, 2012 3:02 am |
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Critical question - compiler version?.
CCS, have two different 'routes' to setting the PLL, on chips with software setup like this. The first is:
| Code: |
#use delay(clock=32MHz, internal=8MHz)
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and the second is using the 'setup_oscillator' function as you show.
Annoyingly, which one works, changes with compiler version.... :(
My 'system', is simple. Try each, and just look at the first few lines of the listing file, to see if the bit does get set.
So, try the #use delay version, and see if it works for your compiler (get rid of the setup_oscillator version).
Best Wishes |
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pisti66
Joined: 03 Jun 2011
Posts: 7
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| Posted: Fri May 11, 2012 4:01 am |
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Hello,
My compiler version is 4.130 .
I removed the setup_oscillator function and changed the "#use delay" line to the suggested, and it works.
Many thanks.
Regards, István |
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