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richi-d
Joined: 28 Aug 2007
Posts: 106
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| PIC18F2410 and 32MHz PLL |
 Posted: Tue Mar 04, 2008 8:26 am |
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Hi all,
I have problems getting the oscillator running at 32MHz. My output shows me- measured with the oscilloskope - only a toggle with 2MHz. So the controller seems to run only in 8MHz mode. All registers seems to be o.k.
OSCTUNE is 0x40 and OSCCON is 0x7C
Compiler Version is 4.038
Here is the code:
| Code: | #include <18F2410.h>
#Fuses INTRC_IO,NOFCMEN,NOIESO,NOWDT,PUT,NOPROTECT,NOBROWNOUT,DEBUG,NOLVP,NOPBADEN
#USE delay (clock=32000000)
#USE STANDARD_IO (A)
#USE STANDARD_IO (B)
#USE STANDARD_IO (C)
#USE STANDARD_IO (E)
#define AUSGABE PIN_C2
#define LED PIN_C6
#define INT PIN_B2
#define RESET PIN_C7
#define CS PIN_A5
#define CLK PIN_C3
#define DATA_IN PIN_C4
#define DATA_OUT PIN_C5
#define NOP #asm NOP #endasm;
short SPI_GELESEN;
int STAGE;
int i;
int array[10];
long PULSWEITE_[4];
#INT_SSP
void SPI_int()
{
array[i] = spi_read ();
++i;
}
#INT_TIMER1
void isr_timer1()
{
}
#INT_TIMER0
void isr_timer0()
{
}
void main()
{
SETUP_OSCILLATOR( OSC_32MHZ );
// SETUP_OSCILLATOR( OSC_PLL_ON );
SETUP_SPI(SPI_MASTER | SPI_H_TO_L | SPI_CLK_DIV_16 );
enable_interrupts(GLOBAL);
enable_interrupts(INT_SSP);
ENABLE_INTERRUPTS(INT_TIMER0);
ENABLE_INTERRUPTS(INT_TIMER1);
SET_TIMER0(0);
SETUP_TIMER_0 ( RTCC_INTERNAL | RTCC_DIV_1); // 1 Timer Increment = 64µs
SETUP_TIMER_1 ( T1_INTERNAL | T1_DIV_BY_8); // 1 Timer Increment = 4µs
SETUP_ADC_PORTS(NO_ANALOGS);
for(;;)
{
output_high(PIN_A2);
output_low(PIN_A2);
output_high(PIN_A2);
output_low(PIN_A2);
output_high(PIN_A2);
output_low(PIN_A2);
output_high(PIN_A2);
output_low(PIN_A2);
output_high(PIN_A2);
output_low(PIN_A2);
output_high(PIN_A2);
output_low(PIN_A2);
output_high(PIN_A2);
output_low(PIN_A2);
output_high(PIN_A2);
output_low(PIN_A2);
}//for()
}//Main() |
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Ttelmah
Guest
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| Posted: Tue Mar 04, 2008 8:41 am |
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32MHz clock, implies 8MIPS (4 clock cycles per instruction on the PIC).
| Code: |
output_high(PIN_A2);
output_low(PIN_A2);
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Using _standard_io_ mode, which you are, implies _4_ instructions (clear the TRIS bit, set the output bit, clear the TRIS bit, clear the output bit).
4 instructions at 8MIPS=500nSec. You are running at 32MHz.
Best Wishes |
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richi-d
Joined: 28 Aug 2007
Posts: 106
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| Posted: Tue Mar 04, 2008 10:48 am |
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Hi,
thank you- you are right- SPI is running with the right speed! |
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