GPS Project: PIC18F26K22 or PIC18F46K22

[richard]

Is there any way to measure this with an Oscilloscope?

measure the led on/off time with the Oscilloscope if the osc is correct then the on/off times will be as per your code


I would leave CONFIG PWRTEN = ON


AND ADD THIS
OSCCON = %01110000 ; 64Mhz
OSCTUNE.6 = 1 ; Enable 4x PLL
while ! osccon2.7 :WEND

to make sure the pll has stabilised before you run any other code , if timing is critical

[astanapane]

measure the led on/off time with the Oscilloscope if the osc is correct then the on/off times will be as per your code


I would leave CONFIG PWRTEN = ON


AND ADD THIS
OSCCON = %01110000 ; 64Mhz
OSCTUNE.6 = 1 ; Enable 4x PLL
while ! osccon2.7 :WEND

to make sure the pll has stabilised before you run any other code , if timing is critical

Hi Richard,

Thanks, i will do that. So that means that the 8th Bit of the OSCCON2 which is the .7 must be presented?

[richard]

I seldom use crystals [you lose two pins for marginal increase in accuracy ] but I believe you can set pll mode in the config section and is all you need

CONFIG PLLCFG = ON
;CONFIG PLLCFG = OFF // pll can only be engaged with software selection for int osc


and then all this is not valid , it applies to internal osc only

OSCCON = %01110000 ; 64Mhz
OSCTUNE.6 = 1 ; Enable 4x PLL


this may or may not be necessary with xtal osc , I have found bootloaders won't sync up unless this is done using int osc with pll.
the PLLRDY bit is asserted when pll is stable [although I can find no mention in data sheet]
while ! osccon2.7 :WEND

[astanapane]

Hi Richard,

i got confused. Really im reading the datasheet and there is nowhere clear setting for using external crystal.

I came up with the following

OSCCON = %01110000 ; 64Mhz
OSCTUNE.6 = 1 ; Enable 4x PLL

Because i was thinking that in order to specify the OSCCON, and the multiplier PLL we need to add those lines even if it is for internal or external source. I didnt think that those where valid only for internal OSC.

So what should i add as OSCCON value, as i use and external crystal 16Mhz? How do i specify the OSCCON value for 64Mhz?

thanks once again. Apologize for all my questions.

[richard]

So what should i add as OSCCON value, as i use and external crystal 16Mhz? How do i specify the OSCCON value for 64Mhz?

nothing , leave it alone

OSCTUNE.6 = 1 ; Enable 4x PLL becomes non functional if CONFIG PLLCFG = ON

[astanapane]

nothing , leave it alone

OSCTUNE.6 = 1 ; Enable 4x PLL becomes non functional if CONFIG PLLCFG = ON

Thanks i'll do so. Tonight i will post result in addition to some pictures from Oscilloscope. Lets see.

[astanapane]

I did the following code test in order to check communication with an uLCD 144 and the LED as before at the same port.

I would love to use the .inc files for the Nokia 3310 or 5110 LCD but really i dont know which files are the ones match.

Anyway i think the code works as it is and the configuration settings are ok.

'*********************************************************************************
@ ERRORLEVEL -306 ; this command prevents the compiler to give you a notice of   *
                  ; crossing page boundary - make sure bits are set              *
'********************************************************************************* 
 
  #CONFIG   ;  The PBP configuration for the PIC18F26K22 is:
;    CONFIG FOSC     = RCIO6	    ; External RC oscillator
     CONFIG FOSC     = HSHP	        ; HS oscillator (high power > 16 MHz)
     

;*---------------------------------4x PLL ENABLE--------------------------------------*|
;*  4X PLL Enable                                                                     *|
;*    CONFIG PLLCFG  = OFF	        ;Oscillator used directly                         *|
    CONFIG PLLCFG    = ON	        ;Oscillator multiplied by 4                       *|
;*------------------------------------------------------------------------------------*|
;
;  Primary clock enable bit
;    CONFIG PRICLKEN = OFF	        ;Primary clock can be disabled by software
    CONFIG PRICLKEN  = ON	        ;Primary clock enabled
;
;  Fail-Safe Clock Monitor Enable bit
    CONFIG FCMEN     = OFF	        ;Fail-Safe Clock Monitor disabled
;    CONFIG FCMEN    = ON	        ;Fail-Safe Clock Monitor enabled
;
;  Internal/External Oscillator Switchover bit
    CONFIG IESO      = OFF	        ;Oscillator Switchover mode disabled
;    CONFIG IESO     = ON	        ;Oscillator Switchover mode enabled
    
    CONFIG  BOREN    = SBORDIS      ; Brown-out Reset enabled in hardware only (SBOREN is disabled)
    
;*--------------------------------------------------------------------------------------------------------;|
    CONFIG  WDTEN    = ON           ; WDT is always enabled. SWDTEN bit has no effect                     ;|
    CONFIG  WDTPS    = 32768        ; 1:32768 ---> HERE enable the watchdog timer with a 1:32768 postscale;|
;*--------------------------------------------------------------------------------------------------------;|
    
    CONFIG  PWRTEN   = ON
    CONFIG  HFOFST   = ON           ; HFINTOSC output and ready status are not delayed by the oscillator stable status
    CONFIG  MCLRE    = EXTMCLR      ; MCLR pin enabled, RE3 input pin disabled
    CONFIG  LVP      = OFF          ; Single-Supply ICSP disabled
    CONFIG  XINST    = OFF          ; Instruction set extension and Indexed Addressing mode disabled (Legacy mode)
    CONFIG  DEBUG    = OFF          ; Disabled

;*----------------------------------------------------------------------------------|
;*---------------Available configuration settings for PIC18F26K22-------------------|
;*----------------------------------------------------------------------------------|
;
;  Oscillator Selection bits
;    CONFIG FOSC = RC	    ;111X External RC oscillator, CLKOUT function on RA6
;    CONFIG FOSC = ECLPIO6  ;EC oscillator (low power, <500 kHz)
;    CONFIG FOSC = ECLP	    ;EC oscillator, CLKOUT function on OSC2 (low power, <500 kHz)
;    CONFIG FOSC = ECMPIO6  ;EC oscillator (medium power, 500 kHz-16 MHz)
;    CONFIG FOSC = ECMP	    ;EC oscillator, CLKOUT function on OSC2 (medium power, 500 kHz-16 MHz)
;    CONFIG FOSC = INTIO7   ;Internal oscillator block, CLKOUT function on OSC2
;    CONFIG FOSC = INTIO67  ;Internal oscillator block
;    CONFIG FOSC = RCIO6    ;External RC oscillator
;    CONFIG FOSC = RC	    ;External RC oscillator, CLKOUT function on OSC2
;    CONFIG FOSC = ECHPIO6  ;EC oscillator (high power, >16 MHz)
;    CONFIG FOSC = ECHP	    ;EC oscillator, CLKOUT function on OSC2 (high power, >16 MHz)
;    CONFIG FOSC = HSMP	    ;HS oscillator (medium power 4-16 MHz)
;    CONFIG FOSC = HSHP	    ;HS oscillator (high power > 16 MHz)
;    CONFIG FOSC = XT	    ;XT oscillator
;    CONFIG FOSC = LP	    ;LP oscillator
    
;*--------------------------------------------------------------------------------------------------------|
;*                                  | -------------------------- |                                        |
;*  -----------------------------   |  [PROTECTED OPTION FUSES]  |  ------------------------------------  |
;*                                  | -------------------------- |                                        |
;*--------------------------------------------------------------------------------------------------------|

    CONFIG  CP0 = OFF             ; Block 0 (000800-003FFFh) not code-protected
    CONFIG  CP1 = OFF             ; Block 1 (004000-007FFFh) not code-protected
    CONFIG  CP2 = OFF             ; Block 2 (008000-00BFFFh) not code-protected
    CONFIG  CP3 = OFF             ; Block 3 (00C000-00FFFFh) not code-protected
    CONFIG  CPB = OFF             ; Boot block (000000-0007FFh) not code-protected
    CONFIG  CPD = OFF             ; Data EEPROM not code-protected
    CONFIG  WRT0 = OFF            ; Block 0 (000800-003FFFh) not write-protected
    CONFIG  WRT1 = OFF            ; Block 1 (004000-007FFFh) not write-protected
    CONFIG  WRT2 = OFF            ; Block 2 (008000-00BFFFh) not write-protected
    CONFIG  WRT3 = OFF            ; Block 3 (00C000-00FFFFh) not write-protected
    CONFIG  WRTC = OFF            ; Configuration registers (300000-3000FFh) not write-protected
    CONFIG  WRTB = OFF            ; Boot Block (000000-0007FFh) not write-protected
    CONFIG  WRTD = OFF            ; Data EEPROM not write-protected
    CONFIG  EBTR0 = OFF           ; Block 0 (000800-003FFFh) not protected from table reads executed in other blocks
    CONFIG  EBTR1 = OFF           ; Block 1 (004000-007FFFh) not protected from table reads executed in other blocks
    CONFIG  EBTR2 = OFF           ; Block 2 (008000-00BFFFh) not protected from table reads executed in other blocks
    CONFIG  EBTR3 = OFF           ; Block 3 (00C000-00FFFFh) not protected from table reads executed in other blocks
    CONFIG  EBTRB = OFF           ; Boot Block (000000-0007FFh) not protected from table reads executed in other blocks

  #ENDCONFIG
  
;*---------------------------------------------------------------------------------------------------------|
;*---------------------------------------------------------------------------------------------------------|

define  OSC 64

        INCLUDE "modedefs.bas"
        INCLUDE"ALLDIGITAL.pbp"

OSCCON    = %01110000   ; 64Mhz
OSCTUNE.6 = 1           ; Enable 4x PLL

while ! osccon2.7 :WEND ; to make sure the pll has stabilised before you run any other code

TRISA = %00000000   'use TRISA to specify which pin is (1 = input) and which (0 = output)  (ALL pins are output)
TRISB = %10000000   'use TRISB to specify which pin is (1 = input) and which (0 = output)  (RB7 PORTB.7 is the RX input pin of the EUART, the rest are output)
TRISC = %10000000   'use TRISC to specify which pin is (1 = input) and which (0 = output)  (RC7 PORTC.7 is the RX input pin of the EUART, the rest are output)
                    'in PORTC the RC3 attached is an LED. 

'           --------------- TRIS A-B-C ---------------
'------------------------------------------------------------------------|
' PORTA.7  PORTA.6  PORTA.5  PORTA.4  PORTA.3  PORTA.2  PORTA.1  PORTA.0 |
'  bit7     bit6     bit5     bit4     bit3     bit2     bit1     bit0   |
'   0        0        0        0        0        0        0        0     |
'------------------------------------------------------------------------|
'------------------------------------------------------------------------|
' PORTB.7  PORTB.6  PORTB.5  PORTB.4  PORTB.3  PORTB.2  PORTB.1  PORTB.0 |
'  bit7     bit6     bit5     bit4     bit3     bit2     bit1     bit0   |
'   1        0        0        0        0        0        0        0     |
'------------------------------------------------------------------------|
'------------------------------------------------------------------------|
' PORTC.7  PORTC.6  PORTC.5  PORTC.4  PORTC.3  PORTC.2  PORTC.1  PORTC.0 |
'  bit7     bit6     bit5     bit4     bit3     bit2     bit1     bit0   |
'   1        0        0        0        0        0        0        0     |
'------------------------------------------------------------------------|

PORTA = 0            'make low all ports at A range
PORTB = 0            'make low all ports at B range
PORTC = 0            'make low all ports at C range
PORTE = 0            'make low all ports at E range 

       
'*-----------------------------------------------------------------------------|
'*                        |  --------------------- |                           |
'*----------------------- | EUART 1 Configuration  | --------------------------|
'*                        |  --------------------- |                           |
'*-----------------------------------------------------------------------------|

        DEFINE HSER_RCSTA 90h ' Enable serial port & continuous receive
        DEFINE HSER_TXSTA 24h ' Enable transmit, BRGH = 1
        DEFINE HSER_CLROERR 1 ' Clear overflow automatically
        DEFINE HSER_SPBRG 160 ' 38400 Baud @ 64MHz, -0,08%
        SPBRGH = 1
        BAUDCON.3 = 1         ' Enable 16 bit baudrate generator
        
'*-----------------------------------------------------------------------------|
'*                        |  --------------------- |                           |
'*----------------------- | EUART 2 Configuration  | --------------------------|
'*                        |  --------------------- |                           |
'*-----------------------------------------------------------------------------|

        DEFINE HSER2_RCSTA 90h ' Enable serial port & continuous receive
        DEFINE HSER2_TXSTA 24h ' Enable transmit, BRGH = 1
        DEFINE HSER2_CLROERR 1 ' Clear overflow automatically
        DEFINE HSER2_SPBRG 160 ' 38400 Baud @ 64MHz, -0,08%
        SPBRGH2 = 1
        BAUDCON2.3 = 1         ' Enable 16 bit baudrate generator
        
'*-----------------------------------------------------------------------------|
'*-----------------------------------------------------------------------------|

Timeout         CON 1000
Counter         var byte
ser_in_data     var byte
LED             var PORTC.3


' -------------------------------------------------------------------------/  
'                          [ LCD Initialization ]                         /
'------------------------------------------------------------------------/
          ' FIRST TIME BOOTUP: We give plenty of time for tbe LCD '
pause 2000  
HSEROUT2[$55]      ' uOLED Initialize this is the 'U' character of autoband rate to LCD
Hserin2  timeout,main,[wait(6)]
hserout2[$56,$01]  ' this is the Version info --> '01 10 17 28 28   -->> "(("
Hserin2  timeout,main,[wait(1),wait(16),wait(23),wait(40),wait(40)]
HSEROUT2 [$45]    ' clear the LCD
Hserin2  timeout,main,[wait(6)]
pause 500

hserout2[$73,$00,$03,$11,$ff,$ff," Leonardo Bilalis",$00] 
Hserin2  timeout,main,[wait(6)]           
hserout2[$73,$02,$06,$10,$ff,"     Copyright 2018",$00]
Hserin2  timeout,main,[wait(6)]
pause 500

Hserout2[$4F,01]
Hserin2  timeout,main,[wait(6)]

HSEROUT2 [$45]    ' clear the LCD
Hserin2  timeout,main,[wait(6)]

Start:
for counter = 1 to 100
HSEROUT2 [$73,$03,$02,$11,$ff,$ff,"Counter:", #counter,$00]
pause 10
next counter
;gosub main ---> i did commented this as from Ioannis's advice. 

main:
high LED
pause 1000
low LED
pause 1000
goto main