16F886 Config & Defines

[retepsnikrep]

Having got a 16F88 project to work thanks to all the members on here i'm back on another project.

The most confusing aspect of the whole thing is getting the chip config settings and defines correct
to start with.
The actual program is usually a doodle in comparison. I've tried to digest the 16F886 datasheet and have cribed quite a lot of code from other threads. But there aren't many exmples specifically for the 16F886. the learning curve for the config is so steep you could become totally frustrated if it was not for forums such as this ;)

I want the chip to run at 8mhz using the internal oscillator, and I would like to use the crystal pins at a
later stage.

I want 10bit analogue inputs on AN0 to AN3

No comparators.

portA 0,1,2,3 analog inputs. Rest as outputs
portB all outputs
portC all inputs

I use the PM assembler.

Can anyone show me an example or two of the config/defines for a similar setup.

I've come up with the following so far.



@ DEVICE PIC16F886,LVP_OFF
@ DEVICE PIC16F886,FCMEN_OFF
@ DEVICE PIC16F886,IESO_OFF
@ DEVICE PIC16F886,BOR_OFF
@ DEVICE PIC16F886,CPD_OFF
@ DEVICE PIC16F886,CP_OFF
@ DEVICE PIC16F886,MCLRE_OFF
@ DEVICE PIC16F886,PWRTE_ON
@ DEVICE PIC16F886,WDT_OFF
@ DEVICE PIC16F886,INTRC_OSC_NOCLKOUT
@ DEVICE PIC16F886,WRT_OFF
@ DEVICE PIC16F886,MCLR_OFF
@ DEVICE PIC16F886,BOD_OFF
@ DEVICE PIC16F886,PROTECT_OFF


Define OSC 8 'Set PicBasic Pro processor speed to 8 Mhz (Must match oscillator value)
OSCCON = %01110001 'Internal 8 mhz Osc

CM1CON0 = 0 'Comparator Off
CM2CON0 = 0 'Comparator Off


'Define ADCIN parameters

Define ADC_BITS 10 'Set number of bits in result (10)
Define ADC_CLOCK 3 'Set clock source (3=rc)
Define ADC_SAMPLEUS 50 'Set sampling time in microseconds (50us)

include "modedefs.bas" 'Allows the use of the serin/serout command


I realise there is still a lot missing from this. :(

[retepsnikrep]

My second effort.



@ DEVICE PIC16F886,LVP_OFF
@ DEVICE PIC16F886,FCMEN_OFF
@ DEVICE PIC16F886,IESO_OFF
@ DEVICE PIC16F886,BOR_OFF
@ DEVICE PIC16F886,CPD_OFF
@ DEVICE PIC16F886,CP_OFF
@ DEVICE PIC16F886,MCLRE_OFF
@ DEVICE PIC16F886,PWRTE_ON
@ DEVICE PIC16F886,WDT_OFF
@ DEVICE PIC16F886,INTRC_OSC_NOCLKOUT
@ DEVICE PIC16F886,WRT_OFF
@ DEVICE PIC16F886,MCLR_OFF
@ DEVICE PIC16F886,BOD_OFF
@ DEVICE PIC16F886,PROTECT_OFF


Define OSC 8 'Set PicBasic Pro processor speed to 8 Mhz (Must match oscillator value)
OSCCON = %01110001 'Internal 8 mhz Osc

CM1CON0 = 0 'Comparator Off
CM2CON0 = 0 'Comparator Off

TRISA = %11111111 'SET PORTA AS INPUTS
TRISB = %00000000 'SET PORTB AS OUTPUTS
TRISC = %11111111 'SET PORTC AS INPUTS

ANSEL = %00001111 'SET INPUTS AN0-AN3 AS ANALOG INPUTS

ADCON0 = %01000001 'SETUP ADC CONVERTER MODULE FOSC/8 & ENABLE ADC MODULE
ADCON1 = %10000000 'SETUP ADC RIGHT JUSTIFY SET REFV to VDD & VSS


'Define ADCIN parameters

Define ADC_BITS 10 'Set number of bits in result (10)
Define ADC_CLOCK 3 'Set clock source (3=rc)
Define ADC_SAMPLEUS 50 'Set sampling time in microseconds (50us)

include "modedefs.bas" 'Allows the use of the serin/serout command

[mackrackit]

I do not use PM, so this is how I set it up using MPASM.


@ __config _CONFIG1, _INTRC_OSC_NOCLKOUT & _WDT_ON & _MCLRE_OFF & _LVP_OFF & _CP_OFF

OSCCON = %01110000
DEFINE OSC 8
CM1CON0 = 0 'Comparator Off
CM2CON0 = 0 'Comparator Off

TRISA = %11111111 'SET PORTA AS INPUTS
TRISB = %00000000 'SET PORTB AS OUTPUTS
TRISC = %11111111 'SET PORTC AS INPUTS
ANSEL = %00001111 'SET INPUTS AN0-AN3 AS ANALOG INPUTS
ADCON1 = %10000000 'SETUP ADC RIGHT JUSTIFY SET REFV to VDD & VSS

'Define ADCIN parameters
Define ADC_BITS 10 'Set number of bits in result (10)
Define ADC_CLOCK 3 'Set clock source (3=rc)
Define ADC_SAMPLEUS 50 'Set sampling time in microseconds (50us)
Not much different than yours...

[retepsnikrep]

@ __config _CONFIG1, _INTRC_OSC_NOCLKOUT & _WDT_ON & _MCLRE_OFF & _LVP_OFF & _CP_OFF
Not much different than yours...

Can you explain __config _CONFIG1 ?

I understand the other statements on that line.

Thanks peter

[ScaleRobotics]

_CONFIG1 is for configuration word 1. If you take a look in your C:\Program Files\Microchip\MPASM Suite and look at the .inc file for the chip you are using, at the bottom of the inc file, you will see:



;================================================= =========================
;
; Configuration Bits
;
;================================================= =========================
_CONFIG1 EQU H'2007'
_CONFIG2 EQU H'2008'

;----- Configuration Word1 ------------------------------------------------

_DEBUG_ON EQU H'1FFF'
_DEBUG_OFF EQU H'3FFF'
_LVP_ON EQU H'3FFF'
_LVP_OFF EQU H'2FFF'
_FCMEN_ON EQU H'3FFF'
_FCMEN_OFF EQU H'37FF'
_IESO_ON EQU H'3FFF'
_IESO_OFF EQU H'3BFF'
_BOR_ON EQU H'3FFF'
_BOR_NSLEEP EQU H'3EFF'
_BOR_SBODEN EQU H'3DFF'
_BOR_OFF EQU H'3CFF'
_CPD_ON EQU H'3F7F'
_CPD_OFF EQU H'3FFF'
_CP_ON EQU H'3FBF'
_CP_OFF EQU H'3FFF'
_MCLRE_ON EQU H'3FFF'
_MCLRE_OFF EQU H'3FDF'
_PWRTE_ON EQU H'3FEF'
_PWRTE_OFF EQU H'3FFF'
_WDT_ON EQU H'3FFF'
_WDT_OFF EQU H'3FF7'
_LP_OSC EQU H'3FF8'
_XT_OSC EQU H'3FF9'
_HS_OSC EQU H'3FFA'
_EC_OSC EQU H'3FFB'
_INTRC_OSC_NOCLKOUT EQU H'3FFC'
_INTRC_OSC_CLKOUT EQU H'3FFD'
_EXTRC_OSC_NOCLKOUT EQU H'3FFE'
_EXTRC_OSC_CLKOUT EQU H'3FFF'
_INTOSCIO EQU H'3FFC'
_INTOSC EQU H'3FFD'
_EXTRCIO EQU H'3FFE'
_EXTRC EQU H'3FFF'

;----- Configuration Word2 ------------------------------------------------

_WRT_OFF EQU H'3FFF' ; No prog memmory write protection
_WRT_256 EQU H'3DFF' ; First 256 prog memmory write protected
_WRT_1FOURTH EQU H'3BFF' ; First quarter prog memmory write protected
_WRT_HALF EQU H'39FF' ; First half memmory write protected

_BOR21V EQU H'3EFF'
_BOR40V EQU H'3FFF'


A couple of the configs are in configuration word 2. This gives Mpasm what it needs to know. If you were setting WRT_OFF, you would have to put it in another config line, like:



@ __config _CONFIG1, _INTRC_OSC_NOCLKOUT & _WDT_ON & _MCLRE_OFF & _LVP_OFF & _CP_OFF
@ __config _CONFIG2, _WRT_OFF


Here is some slightly condensed config info:
http://www.picbasic.co.uk/forum/content.php?r=157-Presetting-Configuration-Fuses-%28PIC-Defines%29-into-your-Program