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Pic18F4520 Osc questions ~OR~ Brain farts! HELP!

 
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KamPutty
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Pic18F4520 Osc questions ~OR~ Brain farts! HELP!
PostPosted: Thu Aug 03, 2006 5:36 pm     Reply with quote
Hi all,

I've got the major case of brain farts here. Question about osc fuses...

Setup: CCS Software Proto Board w/20Mhz crystal, pic18f4520

My WORKING fuses etc for 20mhz is

#fuses HS

This says to me, "High Speed Crystal/Resonator" or 20mhz

~NOW~

I want to go faster!

#1. I could use the internal 8mhz osc with 4x PLL = 32Mhz. What fuses would I need? All I can find is the INTRC_IO for 8mhz, how do I apply the 4x?

Thanks in advance!

~Kam (^8*
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Thu Aug 03, 2006 5:40 pm     Reply with quote
Quote:
What fuses would I need? All I can find is the INTRC_IO for 8mhz.

Scroll down in the 18F4520.h file until you get to the setup_oscillator()
section.
Guest
PostPosted: Thu Aug 03, 2006 6:30 pm     Reply with quote
PCM programmer wrote:

Scroll down in the 18F4520.h file until you get to the setup_oscillator()
section.


Thanks for the pointer! Makes more sense...

NOW I still have an issue!

Here is my code:

Code:

#include <18F4520.h>

#device adc=10
#FUSES NOWDT                    //No Watch Dog Timer
#FUSES NOPROTECT                //Code not protected from reading
#FUSES BROWNOUT                 //Reset when brownout detected
#FUSES BORV25                   //Brownout reset at 2.5V
#FUSES NOPUT                    //No Power Up Timer
#FUSES NOCPD                    //No EE protection
#FUSES STVREN                   //Stack full/underflow will cause reset
#FUSES NODEBUG                  //No Debug mode for ICD
#FUSES NOLVP                    //No low voltage prgming, B3(PIC16) or B5(PIC18) used for I/O
#FUSES NOWRT                    //Program memory not write protected
#FUSES NOWRTD                   //Data EEPROM not write protected
#FUSES IESO                     //Internal External Switch Over mode enabled
#FUSES FCMEN                    //Fail-safe clock monitor enabled
#FUSES PBADEN                   //PORTB pins are configured as analog input channels on RESET
#FUSES NOWRTC                   //configuration not registers write protected
#FUSES NOWRTB                   //Boot block not write protected
#FUSES NOEBTR                   //Memory not protected from table reads
#FUSES NOEBTRB                  //Boot block not protected from table reads
#FUSES NOCPB                    //No Boot Block code protection
#FUSES LPT1OSC                  //Timer1 configured for low-power operation
#FUSES MCLR                     //Master Clear pin enabled
#FUSES NOXINST                  //Extended set extension and Indexed Addressing mode disabled (Legacy mode)

//#FUSES HS                       //20mhz mode
#fuses  INTRC_IO                // internal 8mhz osc

#use delay(clock=32000000)
//#use delay(clock=8000000)

void main()
{
    setup_oscillator(OSC_8MHZ|OSC_INTRC|OSC_PLL_ON);

    output_low(PIN_B0);

    while(1)
    {
        delay_ms(500);
        output_toggle(PIN_B0);
    }
}


I think I have the settings correct(?) The delay is not working correctly.
Also, I'm assuming in the #use delay I enter the NEW speed(32000000), yes?

Also, the manual (CCS) says that using a #fuses INTRC_IO with a valid #use delay, this step (setup_osc) is done automagically...

Well, thanks again for the help!

~Kam (^8*
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Thu Aug 03, 2006 7:59 pm     Reply with quote
What is your version of the compiler ? Here is the oscillator setup code
generated by PCH vs. 3.249 for your program. It looks like it should
work.
Code:

...  setup_oscillator(OSC_8MHZ|OSC_INTRC|OSC_PLL_ON); 
0048:  MOVLW  72  // Setup for 8 MHz with internal oscillator
004A:  MOVWF  FD3   // OSCCON register

004C:  MOVLW  40  // Enable PLL for IntOsc
004E:  MOVWF  F9B   // OSCTUNE register
0050:  MOVF   FD3,W  // Read OSCCON register
Guest
PostPosted: Thu Aug 03, 2006 9:11 pm     Reply with quote
PCM Progammer,

Here is my listing:

Code:

....................     setup_oscillator(OSC_8MHZ|OSC_INTRC|OSC_PLL_ON); 
0044:  MOVLW  72
0046:  MOVWF  FD3
0048:  CLRF   F9B
004A:  MOVF   FD3,W


Here's yours

Code:

...  setup_oscillator(OSC_8MHZ|OSC_INTRC|OSC_PLL_ON);
0048:  MOVLW  72  // Setup for 8 MHz with internal oscillator
004A:  MOVWF  FD3   // OSCCON register

004C:  MOVLW  40  // Enable PLL for IntOsc  <---- MISSING FROM MINE!

004E:  MOVWF  F9B   // OSCTUNE register
0050:  MOVF   FD3,W  // Read OSCCON register


I'm missing a line!

My compiler(s) version is 3.234.

I'm starting to feel sad now... Sad Sad

~Kam
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

View user's profile Send private message

PostPosted: Thu Aug 03, 2006 10:33 pm     Reply with quote
Fix it by adding the two lines shown below.
Code:

#byte OSCTUNE = 0xF9B    // Add this line

void main()
{
setup_oscillator(OSC_8MHZ|OSC_INTRC|OSC_PLL_ON);

OSCTUNE = 0x40;   // PLL ON      Add this line

Guest
PostPosted: Fri Aug 04, 2006 9:53 am     Reply with quote
PCM programmer wrote:
Fix it by adding the two lines shown below.
Code:

#byte OSCTUNE = 0xF9B    // Add this line

void main()
{
setup_oscillator(OSC_8MHZ|OSC_INTRC|OSC_PLL_ON);

OSCTUNE = 0x40;   // PLL ON      Add this line



PCM Programmer,

I added the lines your suggested, and the asm looks right, but there is still an issue with the time! It's still taking approx 2 sec for the "delay_ms(500)" command!

Any Thoughts?

BTW, thanks for all your help!

~Kam (^8*

Code:

0000:  GOTO   002C
....................  #include <18F4520.h>
....................  //////// Standard Header file for the PIC18F4520 device //////////////// 
.................... #device PIC18F4520 
.................... #list 
.................... 
....................   
.................... #device adc=10 
.................... #FUSES NOWDT                    //No Watch Dog Timer 
.................... #FUSES NOPROTECT                //Code not protected from reading 
.................... #FUSES BROWNOUT                 //Reset when brownout detected 
.................... #FUSES BORV25                   //Brownout reset at 2.5V 
.................... #FUSES NOPUT                    //No Power Up Timer 
.................... #FUSES NOCPD                    //No EE protection 
.................... #FUSES STVREN                   //Stack full/underflow will cause reset 
.................... #FUSES NODEBUG                  //No Debug mode for ICD 
.................... #FUSES NOLVP                    //No low voltage prgming, B3(PIC16) or B5(PIC18) used for I/O 
.................... #FUSES NOWRT                    //Program memory not write protected 
.................... #FUSES NOWRTD                   //Data EEPROM not write protected 
.................... #FUSES IESO                     //Internal External Switch Over mode enabled 
.................... #FUSES FCMEN                    //Fail-safe clock monitor enabled 
.................... #FUSES PBADEN                   //PORTB pins are configured as analog input channels on RESET 
.................... #FUSES NOWRTC                   //configuration not registers write protected 
.................... #FUSES NOWRTB                   //Boot block not write protected 
.................... #FUSES NOEBTR                   //Memory not protected from table reads 
.................... #FUSES NOEBTRB                  //Boot block not protected from table reads 
.................... #FUSES NOCPB                    //No Boot Block code protection 
.................... #FUSES LPT1OSC                  //Timer1 configured for low-power operation 
.................... #FUSES MCLR                     //Master Clear pin enabled 
.................... #FUSES NOXINST                  //Extended set extension and Indexed Addressing mode disabled (Legacy mode) 
....................   
.................... //#FUSES HS                       //20mhz mode 
.................... #fuses  INTRC_IO                // internal 8mhz osc 
....................   
.................... #use delay(clock=32000000) 
0004:  CLRF   FEA
0006:  MOVLW  07
0008:  MOVWF  FE9
000A:  MOVF   FEF,W
000C:  BZ    0028
000E:  MOVLW  0A
0010:  MOVWF  01
0012:  CLRF   00
0014:  DECFSZ 00,F
0016:  BRA    0014
0018:  DECFSZ 01,F
001A:  BRA    0012
001C:  MOVLW  5F
001E:  MOVWF  00
0020:  DECFSZ 00,F
0022:  BRA    0020
0024:  DECFSZ FEF,F
0026:  BRA    000E
0028:  GOTO   005E (RETURN)
.................... //#use delay(clock=8000000) 
....................   
.................... #byte OSCTUNE = 0xF9B 
....................   
.................... void main() 
.................... { 
002C:  CLRF   FF8
002E:  BCF    FD0.7
0030:  CLRF   FEA
0032:  CLRF   FE9
0034:  MOVF   FC1,W
0036:  ANDLW  C0
0038:  IORLW  0F
003A:  MOVWF  FC1
003C:  MOVLW  07
003E:  MOVWF  FB4
0040:  MOVF   FB4,W
0042:  BCF    FA1.6
....................     setup_oscillator(OSC_8MHZ|OSC_INTRC|OSC_PLL_ON); 
0044:  MOVLW  72
0046:  MOVWF  FD3
0048:  CLRF   F9B
004A:  MOVF   FD3,W
....................     OSCTUNE = 0x40;   // PLL ON 
004C:  MOVLW  40
004E:  MOVWF  F9B
....................   
....................     output_low(PIN_B0); 
0050:  BCF    F93.0
0052:  BCF    F8A.0
....................   
....................     while(1) 
....................     { 
....................         delay_ms(500); 
0054:  MOVLW  02
0056:  MOVWF  06
0058:  MOVLW  FA
005A:  MOVWF  07
005C:  BRA    0004
005E:  DECFSZ 06,F
0060:  BRA    0058
....................         output_toggle(PIN_B0); 
0062:  BCF    F93.0
0064:  BTG    F8A.0
....................     } 
0066:  BRA    0054
.................... } 
.................... 
0068:  SLEEP

Configuration Fuses:
   Word  1: C800   IESO FCMEN INTRC_IO
   Word  2: 1E1F   BROWNOUT NOWDT BORV25 NOPUT WDT32768
   Word  3: 8700   PBADEN CCP2C1 LPT1OSC MCLR
   Word  4: 0081   STVREN NODEBUG NOLVP NOXINST RESERVED
   Word  5: C00F   NOPROTECT NOCPD NOCPB
   Word  6: E00F   NOWRT NOWRTD NOWRTC NOWRTB
   Word  7: 400F   NOEBTR NOEBTRB
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Fri Aug 04, 2006 2:41 pm     Reply with quote
This thread on the Microchip forum offers some help:
http://forum.microchip.com/tm.aspx?m=145909&mpage=1

Based on that advice, try the following setup code. See if it works.
Code:

#byte OSCCON = 0xFD3 
#byte OSCTUNE = 0xF9B

void main()
{
//    setup_oscillator(OSC_8MHZ|OSC_INTRC|OSC_PLL_ON);

OSCCON = 0x70;   // 8 MHz, Primary Oscillator
OSCTUNE = 0x40;  // PLL ON


Guest
Success!
PostPosted: Sat Aug 05, 2006 11:53 am     Reply with quote
PCM Programmer,

Thanks for all the help! I came across the SAME thread this morning (did not read your message), changed the 0x72 to 0x70, and with your earlier suggestions, it works!

Code:
#fuses  INTRC_IO                // internal 8mhz osc
#use delay(clock=32000000)

#byte OSCTUNE = 0xF9B

void main()
{
    setup_oscillator(OSC_8MHZ|OSC_NORMAL|OSC_PLL_ON);
    OSCTUNE = 0x40;   // PLL ON

    output_low(PIN_B0);

    while(1)
    {
        delay_ms(500);
        output_toggle(PIN_B0);
    }
}


All I changed in the OR's was the OSC_NORMAL (0x00 vs. 0x02).

I was coming to report my new findings to the board, but alas, you beat me to it!

Again, thanks for all your help.

~Kam (^8*
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