16f886

[hvacrtech]

I upgraded from 16F689 to 16F886 due to memory space. Complied fine and i am stuck with all RA's ports. I had no plm with 16F689 using RA5 as clock for shiftin command on RC.6 and RC.7. LCD commands works fine on both PICs (RC's). I cant get clock bursts out on 16F886.

I now focus on getting RA5 or RA6 what ever on any RA's still cant all pins low. Once PIC is on, I could see all RA pins high during start up and wont get into low and cant get clockk bursts on those RA5 or RA6 since those pins stuck at high logic.

Any idea?

comparators are off, ADC are off. I tried everything else getting all RA's LOW.

[skimask]

I upgraded from 16F689 to 16F886 due to memory space......
comparators are off, ADC are off. I tried everything else getting all RA's LOW.

The controlling registers for the comparators and the ADC are a bit different between the '689 and the '886, different values are required in the registers themselves. So, if you're using the same code and expecting it to work, it probably won't.
But, we'll never know without seeing some code!

[hvacrtech]

Here is the code,

Similar idea as first post and still cant get LED flashing even after adding a line for device, i do get RA.6 low but still dont flash yet. without this device line, the pin stays high.



@ INCLUDE "16F886.INC"
Include "bs2defs.bas"

@ DEVICE PIC16F886, INTOSCIO,WDT_ON,MCLR_OFF,LVP_OFF,PROTECT_OFF,BOD_O FF,CPD_OFF,IESO_OFF,FCMEN_OFF,PWRT_OFF 'Device line
define osc 4
OSCCON=%01100000
'ANSEL=0
'ANSELH=0
' ADCON1=$0F ' all digital
'adcon0.0 = %0
ANSEL=%00000000
trisa= %00000000 '%00011100 used in upgrade
'porta=%00000000
' ADCON0 = $00
'cm1con0.7=0
'cm2con0.7=0
'CM1CON0=0 ' need it?
'CM2CON0=0 ' need it?




'CM1CON0 = 0
'CM2CON0 = 0

run:
high 6
pause 1000
low 6
pause 1000
goto run

[skimask]

@ INCLUDE "16F886.INC"

SHOULDN'T need this line...

Include "bs2defs.bas"
@ DEVICE PIC16F886, INTOSCIO,WDT_ON,MCLR_OFF,LVP_OFF,PROTECT_OFF,BOD_OFF,CPD_OFF,IESO_OFF,FCMEN_OFF,PWRT_OFF 'Device line
DEFINE OSC 4 <-ALL DEFINES MUST BE IN CAPS,
'but 4Mhz is the default so it doesn't help or hurt here
OSCCON=$60 : ANSEL=0 : ANSELH=0 : ADCON1=$0F
adcon0=0 : trisa=0 : porta=0
run:
porta.6=1 : pause 1000 : porta.6=0 : pause 1000 : goto run
END <- good practice

[hvacrtech]

My code works. This is really interesting difference between typing in ports on 16F689 and 16F886 like 6 on 16F689 while porta.6 on 16F886 (lower cap works!) and will be sure all are Upper Cap.

I could see the 'Scope high/low.

I copied your code and it produce errors with OSC registery and I rem some, still producing errors.

[hvacrtech]

I need help on 16F886, is there config to disable MSSP?

[mister_e]

Here's some suggestion in case of doubt

1. Open the datasheet under the Pin diagram section (Page 5)
2. See what else your pin may have on (ADCs, Comparator etc etc)
3. if so refer to each section of the extra module you want to disable, or see if they're already enable at POR

Here you don't have anything else than MSSP Pins... so let's see section 13 and it's related Registers.

Register 13-1: SSPSTAT
Nothing in the list seems to enable/disable the module, let's go to the next one

Register 13-2: SSPCON
SSPEN bit 5

bit 5 SSPEN: Synchronous Serial Port Enable bit
In both modes, when enabled, these pins must be properly configured as input or output

In SPI mode:
1 = Enables serial port and configures SCK, SDO, SDI and SS as the source of the serial port pins
0 = Disables serial port and configures these pins as I/O port pins

In I2 C mode:
1 = Enables the serial port and configures the SDA and SCL pins as the source of the serial port pins
0 = Disables serial port and configures these pins as I/O port pins

this bit should be =0 to disable the MSSP port, the POR values says it's already 0. Good practice to clear it yourself for safety sake, while not 100% needed.

same for all other register.. if there's any other

HTH

[hvacrtech]

Somehow the RA.5 randomly stays high since I use RA.5 as pulseout. Even that ADC is disabled, comparator disabled.

Include "bs2defs.bas"
define lcd_dreg portc
define lcd_dbit 0 '0
define lcd_rsreg portc
define lcd_rsbit 4
define lcd_ereg portc
define lcd_ebit 5
define lcd_bits 4
define lcd_lines 2
define lcd_commandus 1500 '1500 2000
define lcd_dataus 44 '44
PAUSE 1000
ADCON1=$0F ' all digital
ANSEL=%00000000

ADCON0 = $00
anselh = %0010 'Convert from Analog input to Digital input.
trisb = %0010 '0=output, 1=input in analog.
anselh = %01000000 'sets portc.6 as input
trisc =%01000000 'sets portc.6 as input
start:

lcdout $FE,1,"TEST THE LCD"

lcdout $FE,$C0," TEST"
PAUSE 1000
high porta.2
pause 500
low porta.2
pause 500
high portb.5
pause 500
low portb.5
lcdout $FE,1,"RESETTING"
pulsout porta.5,1000
pause 1000
pulsout porta.5,1000
pause 1000
goto start



Above program works, but when in big program, RA.5 stays high.

in other program, the following list is added

ANSEL=%00100100 'Rev E
TRISA=%00000011 'Rev E
ADCON1 = %1
ADCON0 = %01000101 'Rev E
CM1CON0.7 = 0 'disables comp1
CM2CON0.7 = 0 'disables comp2
SSPCON.5 = 0 'disables MSSP
'ADCON1=$0F

and those line
pulsout porta.5,1000


that way randomly staying high and no longer getting pulsout. strange.

[mister_e]

OK let's see what RA5 is made of...same rules apply.

We have AN4, C2OUT and SS listed at Page 5.

Let's refer to PORTA section, maybe we have an open collector... maybe....

Page 47, Figure 3.6... mmm nope can be used as GP i/o.

So let's see the ADC section, table 9-2 page 111... ANSEL register.

This have to be
ANSEL=0
ADCON0=0
Let's play safe and disable all ADCs
ANSELH=0


Now the comparators, Register8-1, page 90. At POR they're already disabled... but let's play safe.
CM1CON0=0
CM2CON0=0
Voltage reference, register 8-5, page 99
VRCON = 0

Pulsout will toggle the I/O state, maybe not a bad idea to clear all I/o at the beginning.

PORTA=0
PORTB=0

This ought to work. Case it doesn't, maybe not a bad idea to try

        HIGH PORTA.5
        PAUSE whatever delay
        LOW PORTA.5

OR add a LOW PORTA.5 after the PULSOUT line.

[hvacrtech]

Got it working partially. Will work on it tomorrow.

[mister_e]

Seems to work as design here using the following

        
        @ DEVICE PIC16F886, INTOSCIO,WDT_OFF,MCLR_OFF,LVP_OFF,PROTECT_OFF,BOD_OFF,CPD_OFF,IESO_OFF,FCMEN_OFF,PWRT_OFF 'Device line
        OSCCON= %01100000
        
        Include "bs2defs.bas"

        DEFINE LCD_DREG PORTC 'LCD data port 
        DEFINE LCD_DBIT 0 'LCD data starting bit 0 or 4 
        DEFINE LCD_RSREG PORTC 'LCD register select port 
        DEFINE LCD_RSBIT 4 'LCD register select bit 
        DEFINE LCD_EREG PORTC 'LCD enable port 
        DEFINE LCD_EBIT 5 'LCD enable bit 
        DEFINE LCD_BITS 4 'LCD bus size 4 or 8 
        DEFINE LCD_LINES 2 'Number lines on LCD 
        DEFINE LCD_COMMANDUS 2000 'Command delay time in us 
        DEFINE LCD_DATAUS 50 'Data delay time in us 

        ANSEL=0
        ANSELH=0
        ADCON0=0
        CM1CON0=0
        CM2CON0=0
        VRCON = 0
        PORTA=0
        PORTB=0
        PORTC=0
        TRISA=0
        TRISB=0
        TRISC=0
        PAUSE 1000
                
start:
        
        lcdout $FE,1,"TEST THE LCD"
        
        lcdout $FE,$C0," TEST"
        PAUSE 1000
        high porta.2
        pause 500
        low porta.2
        pause 500
        high portb.5
        pause 500
        low portb.5
        lcdout $FE,1,"RESETTING"
        pulsout porta.5,1000
        pause 1000
        pulsout porta.5,1000
        pause 1000
        goto start

[hvacrtech]

Is CM1CON0=0 the same as CM1CON0.7 = 0?

[mister_e]

well yes almost...mine is the lazy writer version and clear ALL register bits, while yours clear only bit 7... which is enough anyways.