PIC18F4550 question VS PIC16F887

[lerameur]

Hello,

I have a code that works good with the PIC16F887, I want to be able to use it on the 18F4550 chip, the only change I made is to remove the ANSELH = 0 line, It compiles and write to the chip, but nothing is showing on my LCD. The pins are 97% identical between the two chips. This is the first time I am using the 4550 chip or any chip in the 18 series. Can someone tell me why nothing is showing up on the LCD
thanks

DEFINE OSC 8
'ANSELH = 0


'/////////////////////////
'// LCD configuration //
'/////////////////////////

DEFINE LCD_DREG PORTB 	' Set LCD Data port
DEFINE LCD_DBIT 4 		' Set starting Data bit (0 or 4) if 4-bit bus  RB.4, RB.5, RB.6, RB.7
DEFINE LCD_RSREG PORTB 	' Set LCD Register Select port
DEFINE LCD_RSBIT 1 		' Set LCD Register Select bit
DEFINE LCD_EREG PORTB	' Set LCD Enable port
DEFINE LCD_EBIT 0 		' Set LCD Enable bit
DEFINE LCD_BITS 4 		' Set LCD bus size (4 or 8 bits) '4 therefore put wire at 4, 5, 6 and 7 of LCD
DEFINE LCD_LINES 2 		' Set number of lines on LCD
DEFINE LCD_COMMANDUS 2500
DEFINE LCD_DATAUS 250
DEFINE CHAR_PACING 2000
pause 1000

              DPIN    VAR PORTD.3    'I2C DATA PIN
              CPIN    VAR PORTC.3    'I2C CLOCK PIN

              ' -------------- RTC definitions -----------------
          RTC CON     %11010000
          SecReg CON $00 ' seconds Write_Addressess (00 - 59) ' MSB of SecReg must be set to a 0 to enable RTC
          ContReg CON $0E ' control register
          cntrl CON %00000000 ' sets the SQW/OUT to 1Hz pulse, logic level low
          I2CWRITE DPIN, CPIN, RTC, ContReg, [cntrl]
          ' The variable below holds the values entered:
          ' entered by the user
TempVal var byte
Temp1 var byte
Temp2 var byte
i var byte
j var word
sec VAR BYTE : mins VAR BYTE : hr VAR BYTE : day VAR BYTE :date VAR BYTE : mon VAR BYTE : yr VAR BYTE 
Write_Address    VAR WORD
Battery_Charge_Counter var byte
Battery_Charge_Counter = 0
Write_Address = 0 	
B0 var byte
B0 =0
GOSUB SET_RTC
             
Mainloop:

	lcdout $FE,1, "Appuye sur Record"
	lcdout $FE,$C0, "ou sur Show"
	pause 100
	
	 BUTTON PORTC.6,0,10,5,B0,1,Button_pressed
		


			
		if PORTC.7 =0 then 
			if Write_Address = 0 then goto Mainloop
			j = 0
			For i=0 to (Write_Address / 3) -1	
              I2CREAD DPIN,CPIN,$A0,j,[sec,mins,hr]
              PAUSE 10
              LCDOUT $FE,1," Time  ",DEC2 i
              LCDOUT $FE,$C0,"WA ",DEC j," T:", dec2 hr, ":", dec2 mins, ":", dec2 sec
              PAUSE 1000
               j =j + 3
             next i
		Endif
			
GOTO Mainloop
End
Button_pressed:
				GOSUB READ_RTC
				I2CWRITE DPIN,CPIN,$A0,Write_Address,[sec,mins,hr]
				PAUSE 10
				Write_Address = Write_Address +3

Goto Mainloop
				
READ_RTC:
     I2CREAD DPIN, CPIN, $D0, SecReg, [sec,mins,hr,day,date,mon,yr]
	 pause 10
	 			TempVal=hr
				GoSub BCD_TO_BIN
				hr=TempVal
				
                TempVal=sec
				GoSub BCD_TO_BIN
				sec=TempVal

				TempVal=mins
				GoSub BCD_TO_BIN
				mins=TempVal
RETURN

SET_RTC:		' Do once at startup
    yr = $3
    mon = $5
    date = $05
    sec = $09
    mins = $07
    hr = $06
    I2CWRITE DPIN, CPIN, $D0, SecReg, [sec,mins,hr,day,date,mon,yr]
 RETURN
 
 BCD_TO_BIN:                                    ' Convert the BCD values into BIN

     Temp1 = $0F & TempVal                     ' Clear off the top four bits
     Temp1 = Temp1 Dig 0
     Temp2 = TempVal >> 4                       ' Shift down four to read 2 BCD value
     Temp2 = Temp2 Dig 0
     TempVal = Temp2 * 10 + Temp1

Return

[mackrackit]

What are you using for the OSC and did you change the configs to match?

[lerameur]

This is the exact program that i use for the PIC16F887. except ansel=0.
using internal osc at 8mhz

K

[mackrackit]

Then change the configs to use the internal...

[lerameur]

I added a 20Mhz crystal and change the line to DEFINE OSC 20
works better, I think I will change the capacitor because the text is off.
Ok now I guess why cant i use the internal oscillator even using this do not work:
OSCCON = %01110000 '8 Mhz
DEFINE OSC 8

[mackrackit]

Does your configs look like this?
This is for the internal

@ __CONFIG    _CONFIG1L, _PLLDIV_5_1L & _CPUDIV_OSC1_PLL2_1L & _USBDIV_2_1L
@ __CONFIG    _CONFIG1H, _FOSC_INTOSCIO_EC_1H
@ __CONFIG    _CONFIG2H, _WDT_ON_2H & _WDTPS_512_2H
@ __CONFIG    _CONFIG3H, _PBADEN_OFF_3H & _MCLRE_OFF_3H
@ __CONFIG    _CONFIG4L, _LVP_OFF_4L & _ICPRT_OFF_4L &_XINST_OFF_4L

[lerameur]

well not really Dave
here is what I get when I compile:
Executing: "C:\PBP2.60\PBPMPLAB.BAT" -ampasmwin -k# -p18F4550 "both.bas"
Executing: "C:\PBP2.60\PBPW.EXE" -ampasmwin -k# -p18F4550 "both.bas"
PICBASIC PRO(TM) Compiler 2.60A, (c) 1998, 2010 microEngineering Labs, Inc.
All Rights Reserved.

ERROR: Unable to execute mpasmwin.Error[118] C:\PBP2.60\BOTH.ASM 184 : Overwriting previous address contents (0000)
Error[118] C:\PBP2.60\BOTH.ASM 184 : Overwriting previous address contents (0001)
Skipping link step. Not all sources built successfully.
BUILD FAILED: Sat Feb 19 14:31:44 2011


this is the code header I used:

@ __CONFIG    _CONFIG1H, _FOSC_INTOSCIO_EC_1H
DEFINE OSC 8

[lerameur]

Dave i tried your code from this thread:
http://www.picbasic.co.uk/forum/showthread.php?t=13981
and it wont even compile, gives me then errors..

ken

[mackrackit]

What are the errors?

[lerameur]

here they are:

Executing: "C:\PBP2.60\PBPMPLAB.BAT" -ampasmwin -k# -p18F4550 "both.bas"
Executing: "C:\PBP2.60\PBPW.EXE" -ampasmwin -k# -p18F4550 "both.bas"
PICBASIC PRO(TM) Compiler 2.60A, (c) 1998, 2010 microEngineering Labs, Inc.
All Rights Reserved.

ERROR: Unable to execute mpasmwin.Error[118] C:\PBP2.60\BOTH.ASM 186 : Overwriting previous address contents (0000)
Error[118] C:\PBP2.60\BOTH.ASM 186 : Overwriting previous address contents (0001)
Error[118] C:\PBP2.60\BOTH.ASM 195 : Overwriting previous address contents (0000)
Error[118] C:\PBP2.60\BOTH.ASM 195 : Overwriting previous address contents (0001)
Error[118] C:\PBP2.60\BOTH.ASM 204 : Overwriting previous address contents (0002)
Error[118] C:\PBP2.60\BOTH.ASM 204 : Overwriting previous address contents (0003)
Error[118] C:\PBP2.60\BOTH.ASM 213 : Overwriting previous address contents (0004)
Error[118] C:\PBP2.60\BOTH.ASM 213 : Overwriting previous address contents (0005)
Error[118] C:\PBP2.60\BOTH.ASM 222 : Overwriting previous address contents (0006)
Error[118] C:\PBP2.60\BOTH.ASM 222 : Overwriting previous address contents (0007)
Skipping link step. Not all sources built successfully.
BUILD FAILED: Sun Feb 20 01:22:40 2011

[mackrackit]

http://www.picbasic.co.uk/forum/showthread.php?t=543

[lerameur]

I tried it both ways MPASM and PM, and both of them do not work. I cant even compile.

I even tried to compile this program:http://melabs.com/samples/LABXUSB-18F4550/USBMOUSE.htm

I can compile if I just use in the overhead: DEFINE OSC 20 and put an external 20mhz crystal, it is somewhat working, but is not keeping the timer properly and is not showing all the letter on the LCD.

[lerameur]

Using:
DEFINE OSC 8
OSCCON = %01110000

only as the overhead and compiling:
Executing: "C:\PBP2.60\PBPMPLAB.BAT" -ampasmwin -k# -p18F4550 "both.bas"
Executing: "C:\PBP2.60\PBPW.EXE" -ampasmwin -k# -p18F4550 "both.bas"
PICBASIC PRO(TM) Compiler 2.60A, (c) 1998, 2010 microEngineering Labs, Inc.
All Rights Reserved.
Loaded C:\PBP2.60\both.COF.
BUILD SUCCEEDED: Sun Feb 20 10:22:55 2011

but the LCD is only showing black squares...

K

[rsocor01]

but the LCD is only showing black squares...

That looks like a timing issue or maybe a problem with the LCD contrast. That would be my guess. To check that the timing is correct I would try to blink an LED with let's say a 1 sec on and off interval. For the contrast issue I would use a pot to see if there are any changes. Are you using the same voltage with the PIC16F887 and with the PIC18F4550?

Robert

[lerameur]

the pins are the same on both 887 and 4550 chips. The 4550 does work with a 20mhz crystal but the timing is off. It does not record a proper time on the RTC and when I show the time on the LCD and do not pause for 1sec but a bit less then half a second and it always shows me 08:08:08:08. and the first few letters are missing on the lCD on the first line.

K

[lerameur]

I change to DEFINE OSC 40 while still using a 20Mhz crystal. The text is good on the LCD , but the timer always read 08:08:08

K

[lerameur]

Hey Dave,

when yo mentioned these settings:
@ __CONFIG _CONFIG1L, _PLLDIV_5_1L & _CPUDIV_OSC1_PLL2_1L & _USBDIV_2_1L
@ __CONFIG _CONFIG1H, _FOSC_INTOSCIO_EC_1H
@ __CONFIG _CONFIG2H, _WDT_ON_2H & _WDTPS_512_2H
@ __CONFIG _CONFIG3H, _PBADEN_OFF_3H & _MCLRE_OFF_3H
@ __CONFIG _CONFIG4L, _LVP_OFF_4L & _ICPRT_OFF_4L &_XINST_OFF_4L


should they be inside asm... endasm ? or just copy and paste ?

also in the MPLAB I have the build option: -ampasmwin -k#

K

[lerameur]

I changed the config line in the .INC file and it is now working with the 8mhz internal oscillator.
The INC file is configure to handle external oscillator by defAULT. I am figuring how to make it work. even with the original INC file, and only user DEFINE OSC 20. the LCD is not showing any text.

k