PIC16f690 Eread/Ewrite issues

[John Drew]

Derych
The only references to the 16F690 are in the general forum entries which you can see. Nothing in the BETA area that I can find with a search.
A problem that has appeared in a small number of PICs is an error in a PPI file but I don't know if this is the issue here. Have you compared the contents of the PPI file for the 16F690 with the data sheet?
Best wishes
John

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[captainslarty]

Hi all,

I seem to have trouble reading & writing to PIC16f690 eeprom using Eread & Ewrite statements.
Have been using these statements successfully with other PIC's i.e 12f675,16f676 etc.
Does anyone know why this is happening? I desperately need a sulotion as I need to complete a urgent project a.s.a.p. Your help will be greatly appreciated.

Here's a snippet of the way I use it.

Dim Mintemp as word
Dim Maxtemp as word
.
.
.
Mintemp = Eread 0
Maxtemp = Eread 2
.
.
.
Ewrite 0, [Mintemp]
Ewrite 2, [Maxtemp]

The moment I include these read/write functions into my code, the whole program somehow becomes corrupt.


Regards
Deryck

Look at the way it all works and best practice.
For example -
;Variables
Dim wMintemp as word
Dim wMaxtemp as word

;EEprom data Index pointers
eMintemp Edata As Word 10 ; or whatever Value you preset
eMaxtemp Edata As Word 20 ; or whatever Value you preset

;Main Program

wMintemp = Eread eMintemp ; Read from EEPROM index pointer
wMaxtemp = Eread eMaxtemp ; Read from EEPROM index pointer

;Disable global interrupts here if used !
Ewrite eMintemp, [wMintemp] ; Write to EEPROM index pointer
Ewrite eMaxtemp, [wMaxtemp] ; Write to EEPROM index pointer
;Re - Enable global interrupts here if used !

[deryckt]

Derych
The only references to the 16F690 are in the general forum entries which you can see. Nothing in the BETA area that I can find with a search.
A problem that has appeared in a small number of PICs is an error in a PPI file but I don't know if this is the issue here. Have you compared the contents of the PPI file for the 16F690 with the data sheet?
Best wishes
John

Haven't done that yet, will definately have a look at it during course of day. Thanks a lot for your assistance. Greatly appreciated.
Deryck

[deryckt]

This looks like an option. Will make quick changes to this format and see if it works.
Thanks Joe.
P.S. Do you know if Button & Case statements make use of interrupts because my Ewrite statement is nested in a Select Case/ End Case routine.

[captainslarty]

This looks like an option. Will make quick changes to this format and see if it works.
Thanks Joe.
P.S. Do you know if Button & Case statements make use of interrupts because my Ewrite statement is nested in a Select Case/ End Case routine.

No they dont use interrupts Sir . no standard PDS command uses interrupts.

Post or send me your code and I will test it and look at the ASM

email is captainslarty at yahoo dot co dot uk.

I use Edata , Eread and Ewrite all the time -
no problems - do not refer to edata locations directly, use an index pointer as in a label.

here is a brief of example of just one edata setup I am currently using -

'HEAD UNIT EEPROM ALLOCATIONS FOR MENU AND GENERAL CONDITIONING OF ALL OUTPUT !!! 
'ALL USE WORDS as far simpler for lookup conversion !  

    'NB *************** CHANGE CHANNEL ORDER IN MAIN AND HEAD SO V1 = VCC - NOT !! V4   
    'CONFIRM HERE WHEN COMPLETED - NOT YET 20 08 2011 - 

'EDATA index pointers  !
'eChannel_Active_Flag EData As Word  255           'all channels active  - could be byte, but allow for more than 8 channels !

eSCR                 EData As Word  0             '0 = on full, 1 = V only, 2 = Temps only, 3 = off (Manual step) - active channels
'Voltage Channel High Alarm Limit   0 = off
eHAL                 EData As Word  65535, 600, 051 'actual value off, high limit max 30.0 low limit min  5.1 (V1) 
                     EData As Word  65535, 600, 051 'actual value off, high limit max 60.0 low limit min  5.1 (V2) 
                     EData As Word  65535, 600, 051 'actual value off, high limit max 60.0 low limit min  5.1 (V3)
                     EData As Word  65535, 320, 051 'actual value off, high limit max 60.0 low limit min  5.1 (V4 VCC !!!)
                     EData As Word  65535, 490, 005 'actual value off, high limit min 00.5, low limit max  4.90 (V5 LV 5V)
'Voltage Channel Low  Alarm Limit   0 = off
eLAL                 EData As Word  65535, 600, 051 'actual value off, high limit max 30.0 low limit min 30.0
                     EData As Word  65535, 600, 051 'actual value off, high limit max 60.0 low limit min  5.1
                     EData As Word  65535, 600, 051 'actual value off, high limit max 60.0 low limit min  5.1
                     EData As Word  65535, 320, 051 'actual value off, high limit max 60.0 low limit min  5.1
                     EData As Word  65535, 490, 005 'actual value off, high limit max 4.90 low limit min 00.5
'Temeperature Channel High Limit  >99.9 = off as we use 0 to read 0 C ! NOTE !
eTAL                 EData As Word  65535, 099, 000   'actual value  85, high limit max 99 , low limit min 0
                     EData As Word  65535, 099, 000   'actual value  85, high limit max 99 , low limit min 0
                     EData As Word  65535, 099, 000   'actual value  85, high limit max 99 , low limit min 0
                     
eDIS                 EData As Word  255'143'15
eTCF                 EData As Word  0               '0 = degrees C , 1 = Degrees F Convertion needed


eBLC                 EData As Word  1               '0 = Auto, 1 = Grn, 2 = Red, 3 = Blu, 4 = Off
eBLT                 EData As Word  20              'in seconds
eLED                 EData As Word  10              'in seconds  Button Backlight Time !
eALA                 EData As Word  0               '0 OFF - 1 ON
;testing of new relay only !!
eRRS                 EData As Word  1  ;relay reset after max time exceded -flag - 
eRES                 EData As Word  0  ;relay state /status?  
eREL                 EData As Word  256't3 'v5 '256 ' t3 'v1            'bit set points to channel !!! bit 0 = 1 = OFF ,bit 1 = 1 = chann 1 etc
eRON                 EData As Word  4   ;trigger on value
eROF                 EData As Word  5   ;trigger off value
eRTO                 EData As Word  10 ' minutes time relay is on after off
eRTM                 EData As Word  15 ' minutes timeout if off value nver reached             '

eSLP                 EData As Word  0               '0 off - 1 on
eCON                 EData As Word  6               'Contrast TEST from 05 01 2012 )1 to 8 where 1 is min and 8 is max - 
eUID                 EData As Word  11              'Unit ID From Main ? - check with Kai !
eUSV                 EData As Word  100             'HEAD Firmware Version Number
eRSV                 EData As Word  101             'Main Firmware Version Number
eLOC                 EData As Word  65535           'Lock off = 65535, otherwise (001 - 999)
eRST                 EData As Word  0               ' 0 = ok, 1 = factory reset needed !!!

eFTO                 EData As Byte  0               ' first time on ! else 1 - reset to 0 on factory reset
eVCC                 EData As Byte  0               ' 0 = 12 , 1 = 24

Menu_Lookup          EData As Word Menu_0, Menu_1, Menu_2, Menu_3, Menu_4, Menu_5, Menu_6    'SEL
                     EData As Word Menu_7, Menu_8, Menu_9, Menu_10,Menu_11,Menu_12,Menu_13,Menu_14,Menu_15,Menu_16,Menu_17 'BLT
                     EData As Word Menu_18,Menu_19,Menu_20,Menu_21,Menu_22,Menu_23,Menu_24,Menu_25,Menu_26  'BOTH 
Edata_Lookup         EData As Byte eSCR,eLAL,eHAL,eTAL,eDIS,eTCF,0  'Sel
                     EData As Byte eBLC,eBLT,eLED,eALA,eRRS,eRES,eREL,eRON,eROF,eRTO,eRTM,0 'Blt
                     EData As Byte eSLP,eCON,eUID,eUSV,eRSV,eLOC,eRST,0 'Sel + Blt

Edata_End            EData As Byte 0    ' 204 bytes used so far as of build 2_99 !   ' for testing only ! to see eeprom space used !
;New rel 1939 V2 edata end

And some sample use -

bTMP_Var1 = ERead eFTO                        ' is this the first time ever on, or after factory reset ?
    INTCON.7=0 ; disable interrupts
    If bTMP_Var1 = 0 Then                     ' this IS the first time on or factory reset- 
            If wVolts[3] <  170 Then          ' VCC = 12V 
                wTMP_Var2 = 155               ' 15.5V High Alarm
                wTMP_Var3 = 119               ' 11.9V Low  Alarm
                flgVCC_12_24 = 0              ' VCC = 12 flag
            ElseIf wVolts[3] > 170 Then       ' VCC = 24V  
                wTMP_Var2 = 310               ' 32.0V High Alarm (Possibly 33V not available >>>??)
                wTMP_Var3 = 238               ' 24.4V Low  Alarm 
                flgVCC_12_24 = 1              ' VCC = 24 flag
            EndIf
        'endif
        EWrite eVCC,[flgVCC_12_24]            ' set eVCC to 0 (12v range) or 1 (24v range)
        EWrite eFTO,[1]                       ' now NOT first time on so set eFTO to 1 
        EWrite eHAL + 18 ,[wTMP_Var2]         ' write the range setting to eHAL V4 for 12 or 24 VCC
        EWrite eLAL + 18 ,[wTMP_Var3]         ' write the range setting to eLAL V4 for 12 or 24 VCC
    EndIf
    INTCON.7=1 ;re-enable interrupts

Ignore the comments as they are from mostly outdated code - but is shows eread and ewrite and edata usage.

Joe.

edit - this is using 16F1939

[deryckt]

Thanks Joe, I sent it to you via e-mail. Let me know if for some reason it didn't reach you.
Best regards
Deryck

[captainslarty]

Thanks Joe, I sent it to you via e-mail. Let me know if for some reason it didn't reach you.
Best regards
Deryck

Got the email Sir
Reply sent, please see button command !
Joe.

[deryckt]

Thanks again Joe,

Got it to finally work. Nothing wrong with anything here. Turns out to be poor me using Button command incorrectly. Button command points to Gosub routines instead of Lables. Cunfused the poor PIC chip into going completely corrupt. Changed it, and now it works like a bomb. Only trouble now is that the LM35 gives a Zero readout, but I think I know why. I rolled back to the original packaged compiler yesterday evening and I know that a few people are having trouble with ADIN command using 16f690. I'll just search the forum and find the solution.

Thanks again to everybody for their help & assistance. I'm new to this forum and my first impression definately is a good one.
Will visit here soon and see if I can maybe offer some help to other users from time to time.

Best regards
Deryck

[deryckt]

This seems to be one of Microchip's "never to be released Chip". Not only do I have endless problems with it, but it seems that a Google search brings up endless problems with it. Wish they would just stick their pride and give it to you straight.