GPS Project: PIC18F26K22 or PIC18F46K22

[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

[Ioannis]

This is a bad programing.

You use a gosub to main but there is no return from the main.

Delete the line gosub main as there is no point.

Be very careful with such commands, as it is common to novice programmers this error. Your program will crash with no obvious reason.

Ioannis

[astanapane]

This is a bad programing.

You use a gosub to main but there is no return from the main.

Delete the line gosub main as there is no point.

Be very careful with such commands, as it is common to novice programmers this error. Your program will crash with no obvious reason.

Ioannis

Oppps , i didnt notice.

Thanks Ioanni. As you see i have also configured the First EUART. There will be placed either the GPS module or the SD card.

P.S. didnt have a time tonight to do the test and post pictures from the oscilloscope. Will do that tomorrow.

[richard]

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.

setting the tris incorrectly will stop the eusarts from working


from data sheet

Setting the TXEN bit of the TXSTAx register enables thetransmitter circuitry of the EUSART. Clearing the SYNC
bit of the TXSTAx register configures the EUSART for
asynchronous operation. Setting the SPEN bit of the
RCSTAx register enables the EUSART and
automatically configures the TXx/CKx I/O pin as an
output. If the TXx/CKx pin is shared with an analog
peripheral the analog I/O function must be disabled by
clearing the corresponding ANSEL bit.