Pic 18f Usb

[Raflex]

Hello Rytech, your code is ok, i tried to compile it and it works. Probably you need a newer version of pbp or microcode studio.

[RYTECH]

I have PBP Compiler 2.46, Microcode studio 2.2.1.1 and version 4.21 beta of MeLabs Programmer software

[RYTECH]

Hopefully someone can comment on why my compiler doesnt know what ADCON1 & ADCON2 is for the 18F series chip.

If i take out ADCON2 and the usb stuff and compile for 16F877A it has no problems with ADCON1 - which to me suggest my support for a 18F4550 is buggered.

this compiles fine for the 16F877A:


DEFINE OSC 20
DEFINE LOADER_USED 1
'ADC defines
Define ADC_BITS 10 ' Set number of bits in result
Define ADC_CLOCK 3 ' Set clock source /32
Define ADC_SAMPLEUS 50 ' Set sampling time in uS
Quanta con 1251
Adval VAR WORD

USBBufferSizeMax con 64 ' maximum buffer size
USBBufferSizeTX con 64 ' input
USBBufferSizeRX con 64 ' output

' the USB buffer...
USBBuffer Var Byte[USBBufferSizeMax]
USBBufferCount Var Byte
x VAR BYTE


TRISA.0 = 1 ' RA0 input

ADCON1 = %00001110 ' A/D channel 0
'ADCON2 = %10000011 ' Left justify for 10-bit

'usbinit ' initialise USB...
x = 0
LOW PORTB
BlinkLED:
if x = 7 then ProgramStart
x = x + 1
HIGH PORTB.7
PAUSE 1000
LOW PORTB.7
PAUSE 500
goto blinkLED
ProgramStart:
x = 0
gosub DoUSBIn
gosub DoUSBOut
goto ProgramStart

' ************************************************** **********
' * receive data from the USB bus *
' ************************************************** **********
DoUSBIn:
USBBufferCount = USBBufferSizeRX ' RX buffer size
' USBService ' keep connection alive
' USBIn 1, USBBuffer, USBBufferCount, DoUSBIn ' read data, if available
if usbbuffer[2] = 1 then
high portb.7
ENDIF
IF USBbuffer[2] = 0 THEN
LOW portb.7
ENDIF
goto DoAD
return
DoAD:
ADCIN 0,adval ' Read A/D channel 0 into ADval variable
ADval = ADval */ Quanta ' Quanta result

' Load data buffer
USBBuffer[0] = Adval dig 3 'Y.LowByte
USBBuffer[1] = "."
USBBuffer[2] = Adval DIG 2
USBBuffer[3] = Adval DIG 1
USBBuffer[4] = aDVAL DIG 0
RETURN
' ************************************************** **********
' * wait for USB interface to attach *
' ************************************************** **********
DoUSBOut:
USBBufferCount = USBBufferSizeTX ' TX buffer size
'USBService ' keep connection alive
'USBOut 1, USBBuffer, USBBufferCount, DoUSBOut ' if bus available, transmit data
return

[RYTECH]

I just applied the update for version 2.46 - no effect.

[RYTECH]

Updated MPLAB & MPASM to latest version - no effect.

[skimask]

Try this:

'ADCON2 = %10000011 ' Left justify for 10-bit
Poke $fc0, $83 'which is the same thing as the line above.

[RYTECH]

Ok that compiled... with warnings...

Warning c:\progra~1\picbas~1\18F4550.inc 20: _CONFIG has been depreciated for PIC18 devices. Use CONFIG (repeated about 8 ti

does the fact that the "POKE" command compiled tell us why ADCON1 & ADCON2 would not?

[skimask]

does the fact that the "POKE" command compiled tell us why ADCON1 & ADCON2 would not?

PBP 2.47 shows fixes for miscellaneous items and a few other things.
Maybe that's one of the fixes...who knows. And, heck, if Poke works, who cares

[RYTECH]

Ok, so poke just manually writes values to the given registers?

I'd still like to figure out why ADCON1 & ADCON2 is not working.



ADCON1 = %00001110 ' A/D channel 0

'ADCON2 = %10000011 ' Left justify for 10-bit
Poke $fc0, $83 'which is the same thing as the line above.

[RYTECH]

PBP 2.47 shows fixes for miscellaneous items and a few other things.
Maybe that's one of the fixes...who knows. And, heck, if Poke works, who cares

Yeah if the peek and poke work thats fine for me, I had used ADCON commands before and am a little stumped about why it would work in once case for a certain PIC and not for another (the 18F4550). I knew it might be a matter of having support for the specific chip. i'm hoping other commands don't have syntax errors as i go...

I wonder if 2.47 resolves the Syntax error as I intend to start using the USB type 18Fxxxx type PICs

How do i find the microcontroller register address for ADCON0 - ADCON1 - ADCON2, is it in the datasheet? ( the sections describing A/D operation dont seem to list the address locations)