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cvargcal
Joined: 17 Feb 2015
Posts: 134
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| how running 18F26K22 to 64MHZ internal? |
 Posted: Sat Apr 04, 2015 9:46 pm |
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Someone can help me with this doubt:
I want to have the max speed
| Code: |
#FUSES NOWDT //No Watch Dog Timer
#FUSES WDT128 //Watch Dog Timer uses 1:128 Postscale
#FUSES INTRC_IO //Internal RC Osc, no CLKOUT
#FUSES NOPLLEN //4X HW PLL disabled, 4X PLL enabled in software
#FUSES NOFCMEN //Fail-safe clock monitor disabled
#FUSES NOIESO //Internal External Switch Over mode disabled
#FUSES NOBROWNOUT //No brownout reset
#FUSES WDT_SW //No Watch Dog Timer, enabled in Software
#FUSES NOPBADEN //PORTB pins are configured as digital I/O on RESET
#FUSES NOMCLR //Master Clear pin used for I/O
#FUSES NOSTVREN //Stack full/underflow will not cause reset
#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=64M)
main(){
setup_oscillator(OSC_64MHZ|OSC_INTRC|OSC_PLL_OFF);
}
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But no work the timer1, i think that no runnig to 64M
| Code: |
#int_TIMER1
void TIMER1_isr(void){ //
cont++; //
if(cont == 2){ // 0,5*1=1 seg
ban_1seg = 1;cont = 0;
}
set_timer1(-934464); // 0.5=4/64000000*8(65536-x),x=-934464
}
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Thank! |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19499
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| Posted: Sun Apr 05, 2015 2:28 am |
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First, you are turning it off......
There is not a 64MHz 'oscillator' internally. The fastest is the 16Mhz oscillator, _which you can then run with the PLL, to give 64MHz_...
You are deliberately turning the PLL off!....
What does OSC_PLL_OFF do?.
Then, your 'main' code will run off the end, and stop the chip.
Then you are not enabling the interrupt.
Then you are not setting up/starting the timer.
Then the timer is a 16bit timer. What makes you think it can be set to a value like -934464?.
You have a lot of problems.....
| Code: |
#include <18F26K22.h>
#FUSES NOWDT //No Watch Dog Timer
#FUSES INTRC_IO //Internal RC Osc, no CLKOUT
#FUSES NOPLLEN //4X HW PLL disabled, 4X PLL enabled in software
#FUSES NOFCMEN //Fail-safe clock monitor disabled
#FUSES NOIESO //Internal External Switch Over mode disabled
#FUSES NOBROWNOUT //No brownout reset
#FUSES WDT_SW //No Watch Dog Timer, enabled in Software
#FUSES NOPBADEN //PORTB pins are configured as digital I/O on RESET
#FUSES NOMCLR //Master Clear pin used for I/O
#FUSES STVREN //Stack full/underflow will cause reset
#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=64M, internal=16MHz)
int8 cont=0;
int8 ban_1seg=0;
#define TICKS 15 //interrupt ticks for 0.5 seconds
#int_TIMER1
void TIMER1_isr(void)
{
static int8 internal=TICKS-1;
if (internal)
--internal;
else
{
//Now this will be approximately 0.5 seconds
internal=TICKS-1; //reset counter
cont++; //
if(cont == 2)
{ // 0,5*1=1 seg
ban_1seg = 1;
cont = 0;
}
}
}
void main(void)
{
setup_oscillator(OSC_64MHZ | OSC_INTRC);
//Now the _slowest_ timer1 can run from a 64MHz clock, is 64000000/(4*8*65536) = 30.5 interrupts/second...
setup_timer1(T1_INTERNAL | T1_DIV_BY_8);
enable_interrupts(INT_TIMER1);
enable_interrupts(GLOBAL); //enable the interrupt
do
{
} while (TRUE); //and leave the chip running waiting for interrupts
}
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cvargcal
Joined: 17 Feb 2015
Posts: 134
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| Posted: Sun Apr 05, 2015 9:59 am |
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| Ttelmah wrote: | First, you are turning it off......
There is not a 64MHz 'oscillator' internally. The fastest is the 16Mhz oscillator, _which you can then run with the PLL, to give 64MHz_...
You are deliberately turning the PLL off!....
What does OSC_PLL_OFF do?.
Then, your 'main' code will run off the end, and stop the chip.
Then you are not enabling the interrupt.
Then you are not setting up/starting the timer.
Then the timer is a 16bit timer. What makes you think it can be set to a value like -934464?.
You have a lot of problems.....
| Code: |
#include <18F26K22.h>
#FUSES NOWDT //No Watch Dog Timer
#FUSES INTRC_IO //Internal RC Osc, no CLKOUT
#FUSES NOPLLEN //4X HW PLL disabled, 4X PLL enabled in software
#FUSES NOFCMEN //Fail-safe clock monitor disabled
#FUSES NOIESO //Internal External Switch Over mode disabled
#FUSES NOBROWNOUT //No brownout reset
#FUSES WDT_SW //No Watch Dog Timer, enabled in Software
#FUSES NOPBADEN //PORTB pins are configured as digital I/O on RESET
#FUSES NOMCLR //Master Clear pin used for I/O
#FUSES STVREN //Stack full/underflow will cause reset
#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=64M, internal=16MHz)
int8 cont=0;
int8 ban_1seg=0;
#define TICKS 15 //interrupt ticks for 0.5 seconds
#int_TIMER1
void TIMER1_isr(void)
{
static int8 internal=TICKS-1;
if (internal)
--internal;
else
{
//Now this will be approximately 0.5 seconds
internal=TICKS-1; //reset counter
cont++; //
if(cont == 2)
{ // 0,5*1=1 seg
ban_1seg = 1;
cont = 0;
}
}
}
void main(void)
{
setup_oscillator(OSC_64MHZ | OSC_INTRC);
//Now the _slowest_ timer1 can run from a 64MHz clock, is 64000000/(4*8*65536) = 30.5 interrupts/second...
setup_timer1(T1_INTERNAL | T1_DIV_BY_8);
enable_interrupts(INT_TIMER1);
enable_interrupts(GLOBAL); //enable the interrupt
do
{
} while (TRUE); //and leave the chip running waiting for interrupts
}
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Yes, i have many problems xD
Ok, Thank
I say 64MH because in PIC18F26K22.h
is:
| Code: | #define OSC_PLL_ON 0x4000
#define OSC_PLL_OFF 0
#define OSC_31250 0x8000
#define OSC_31KHZ 0x00
#define OSC_250KHZ 0x10
#define OSC_500KHZ 0x20
#define OSC_1MHZ 0x30
#define OSC_2MHZ 0x40
#define OSC_4MHZ 0x50
#define OSC_8MHZ 0x60
#define OSC_16MHZ 0x70
#define OSC_32MHZ 0x4060
#define OSC_64MHZ 0x4070 |
and the timer is with this formule :0.5=4/64000000*8(65536-x),x=-934464
;) Thank! my my knowledge is little.
The code work, but please do you can say how work?
Why #define TICKS 15?
why you no used set_timer1()? |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19499
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| Posted: Sun Apr 05, 2015 10:56 am |
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Yes, I'm being a 'pedant'. 
However it is important to understand that you run with a 16MHz oscillator, and a 64MHz clock.
Little details like this are vital when dealing with chips.
Being pedantic, several of the standard CCS nomenclatures are 'dubious'. It's like "#use RS232", which actually controls the generation of TTL async serial, _not_ 'RS232'. This can be used with a whole variety of different signalling standards (RS232, RS485 etc..), but can't actually generate 'RS232' without external hardware. It's little details like this that encourage getting 'the wrong idea' about what chips can actually do!.... |
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cvargcal
Joined: 17 Feb 2015
Posts: 134
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| Posted: Sun Apr 05, 2015 11:13 am |
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| Ttelmah wrote: | Yes, I'm being a 'pedant'.
However it is important to understand that you run with a 16MHz oscillator, and a 64MHz clock.
Little details like this are vital when dealing with chips.
Being pedantic, several of the standard CCS nomenclatures are 'dubious'. It's like "#use RS232", which actually controls the generation of TTL async serial, _not_ 'RS232'. This can be used with a whole variety of different signalling standards (RS232, RS485 etc..), but can't actually generate 'RS232' without external hardware. It's little details like this that encourage getting 'the wrong idea' about what chips can actually do!.... |
Thank master, now undertand that on thing is oscillador and other is clock.
Do you think that is better used external oscillator to internal?
My other questions is.
I used this for timer1 (with 4MHZ work perfect)
| Code: | #int_TIMER1
void TIMER1_isr(void){ //
cont++; //
if(cont == 2){ // 0,5*2=1 segundo
ban_1seg = 1;cont = 0; //
} //
set_timer1(3036); // 0.5=4/4000000*8(65536-x),x=3036 >> Tiempo de desbordamiento es 0.5 segundos
} |
and
| Code: | void main(){
//-------------- Configuración ---------- //
setup_timer_1 (T1_INTERNAL | T1_DIV_BY_8); // Configuración Timer1
set_timer1 (3036); // 0.5=4/4000000*8(65536-x),x=3036 >> Tiempo de desbordamiento es 0.5 segundos
enable_interrupts(int_timer1); // Deshabilitar Interrupción timer1
enable_interrupts(GLOBAL); // Habilitar Interrupción Global
Reset();
enable_interrupts(int_timer1); // Habilitar Interrupción Timer1
//--------------- Subprograma ---------------
while(true){
if(ban_1seg){ //
ban_1seg = 0; seg++; //
if(seg == 60){ // Si ya van 60 seg
seg=0;min++; //
if (min==6){ //
min=0; //
disable_interrupts(int_timer1); Reset(); //
}
}
}
}
} |
I no undertand your code
| Code: |
int8 cont=0;
int8 ban_1seg=0;
#define TICKS 15 //interrupt ticks for 0.5 seconds
#int_TIMER1
void TIMER1_isr(void)
{
static int8 internal=TICKS-1;
if (internal)
--internal;
else
{
//Now this will be approximately 0.5 seconds
internal=TICKS-1; //reset counter
cont++; //
if(cont == 2)
{ // 0,5*2=1 seg
ban_1seg = 1;
cont = 0;
}
}
} |
Why 15?
Thank so much! |
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