16F690 read/write

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- 20th November 2016, 21:35
louislouis

16F690 read/write

Hello,
I need a little help with read and write to internal EEPROM in PIC16F690.

I try to write to adress 10, value 1

like:

Code:

led1 var portc.4 buton1 var porta.4 led1flag var bit init: low led1 let led1flag = 0 zac: read 10, led1flag if buton1 = 0 and led1flag = 0 then goto onled if buton1 = 0 and led1flag = 1 then goto offled goto zac onled: high led1 let led1flag = 1 write 10, led1flag debounce: if buton1 = 0 then pause 10 goto debounce endif goto zac offled: low led1 let led1flag = 0 write 10, led1flag debb: if buton1 = 0 then pause 10 goto debb endif goto zac

But the program stuck on read and the write instruction.
On 16F628 I use these commands and it works, on 16F690 I am doing something wrong. Please can someone to explain how use READ and WRITE instruction on this chip. Thanks.
- 21st November 2016, 03:00
richard

Re: 16F690 read/write

your pgm is an incomplete undebugable snippet , start here
http://www.picbasic.co.uk/forum/showthread.php?t=561
- 21st November 2016, 10:40
louislouis

Re: 16F690 read/write

Hello Richard,

here is a complete code with config:

Code:

'* Notes : PIC16F690 * '* : * '**************************************************************** _INTRC_OSC_NOCLKOUT ; Using Internal Oscillator _WDT_OFF; Edisable Watch Dog Timer _MCLRE_OFF; disable MCLR _CP_OFF ;Disable Code Protection _CPD_OFF ; Disable Data Code Protection _FCMEN_OFF ; Disable Fail Safe Clock Monitor _IESO_OFF ; Disable Internal/External switchover _BOR_ON ;Enable Brown out detect _PWRTE_ON ; Enable Power up Timer @MyConfig = _INTRC_OSC_NOCLKOUT & _WDT_OFF & _PWRTE_ON @MyConfig = _MCLRE_OFF & _BOR_OFF DEFINE OSC 8 ; tells PBP we use a 8 MHZ clock OSCCON = %01110000 ANSEL = 0 ;set all digital TRISA = %110100 ; Set RA5,RA4 and RA2 input, rest output TRISB = %0000 ; PORT B all output TRISC = %00000000 ; PORT C all output CM1CON0 = 0 ' Disable comparator 1 CM2CON0 = 0 ' Disable comparator 2 led1 var portc.4 buton1 var porta.4 led1flag var bit low led1 let led1flag = 0 init: read 10,led1flag pause 2 main: if led1flag = 1 then high led1 else low led1 endif if buton1 = 0 then let led1flag = 1 goto writetoeeprom endif goto main writetoeeprom: write 10, led1flag pause 2 debounce: if buton1 = 0 then goto debounce goto init end

The WRITE and READ instructions works on 16F628, 16F688 as is in the code, but on 16F690 still not.
I think on 16F690 must to be defined something to proper work with internal eeprom, but I don't know what.

If I try simple:

Code:

led var bit let led = 1 write 10, led main: read 10, led SEROUT porta.2,T9600,[led] end

Nothing writen in to the eeprom.
- 21st November 2016, 11:27
richard

Re: 16F690 read/write

Quote:

main:
read 10, led
SEROUT porta.2,T9600,[led]
end

you realise the chr's 0,1,255 {all the likely eprom values you expect} are unprintable , there is nothing special or different about 16f690 eprom

SEROUT porta.2,T9600,[#led] or
SEROUT porta.2,T9600,[dec led]
is whats required
- 21st November 2016, 11:39
richard

Re: 16F690 read/write

and I doubt your config setting is correct

it could go like this , but why would you

Quote:

@MyConfig = _INTRC_OSC_NOCLKOUT & _WDT_OFF & _PWRTE_ON
@MyConfig = MyConfig & _MCLRE_OFF & _BOR_OFF & _FCMEN_OFF & _IESO_OFF
@ __config MyConfig

this is the prescribed way

Quote:

#CONFIG
cfg = _INTRC_OSC_NOCLKOUT
cfg&= _WDT_ON
cfg&= _PWRTE_OFF
cfg&= _MCLRE_ON
cfg&= _CP_OFF
cfg&= _CPD_OFF
cfg&= _BOD_ON
cfg&= _IESO_ON
cfg&= _FCMEN_ON
__CONFIG cfg

#ENDCONFIG

or this

Quote:

#CONFIG
__config _INTRC_OSC_NOCLKOUT & _WDT_ON & _PWRTE_OFF & _MCLRE_ON & _CP_OFF & _CPD_OFF & _BOD_ON & _IESO_ON & _FCMEN_ON
#ENDCONFIG
- 21st November 2016, 11:42
aerostar

Re: 16F690 read/write

You code for sending the value out is sending unprintable characters to whatever is receiving the serial.

if your bit is a 0 then that is a null character, if it is a 1 then it is a SOH see here

http://www.asciitable.com/

If you want to see the character as a printable digit then add 48 to it
SEROUT porta.2,T9600,[led+48]

You could also run your simple program then put the pic back in the programmer, read and view the eeprom data.
- 21st November 2016, 11:54
louislouis

Re: 16F690 read/write

Quote:

Originally Posted by richard

and I doubt your config setting is correct

it could go like this , but why would you

this is the prescribed way

or this

Sorry, that is my copy paste error.
- 21st November 2016, 12:00
louislouis

Re: 16F690 read/write

Yes this is true, my serout command is not correct, but if I try simple write in to the eeprom the program stuck and not run next.

Like:

Code:

led var bit let led = 1 led var portc.4 write 10, led main: high led pause 500 low led pause 500 goto main end
- 21st November 2016, 12:16
richard

Re: 16F690 read/write

Quote:

led var bit
let led = 1
led var portc.4

write 10, led

main:
high led
pause 500
low led
pause 500
goto main
end

once again an uncompilable piece of code,there is nothing special or different about 16f690 eprom . snippets are pointless
try and post a complete and correct pgm that demonstrates the issue
- 21st November 2016, 12:25
richard

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Re: 16F690 read/write

works just fine for me
- 21st November 2016, 12:41
louislouis

Re: 16F690 read/write

OK, I try to make a memory pushbutton. If I switch on the power supply and push the button then lit up the led and i want to store to the eeprom value 1 which represent the led is on flag. When I switch off the power supply and then switch on again I want to read value from eeprom and if it is 1 then the led is lit up immediately after power is applied without pushing the button.

I can program the pic, for me not work the write and the read to internal eeprom instruction.

On different chip like 16F688 I normally use the Write and Read command to store and read variable value to internal eeprom like:

WRITE Adress, Value
(write 10,1)
and

READ Adress, Var
(read 10,led)

On 16F690 chip It doesn't work for me. The program stops on the line where is the WRITE command or if the read commadn is first then stops on this line.
- 21st November 2016, 13:02
richard

Re: 16F690 read/write

this is what I tried , it works fine

Code:

#CONFIG cfg = _INTRC_OSC_NOCLKOUT cfg&= _WDT_ON cfg&= _PWRTE_OFF cfg&= _MCLRE_ON cfg&= _CP_OFF cfg&= _CPD_OFF cfg&= _BOD_ON cfg&= _IESO_ON cfg&= _FCMEN_ON __CONFIG cfg #ENDCONFIG DEFINE OSC 8 ; tells PBP we use a 8 MHZ clock OSCCON = %01110000 ANSEL = 0 ;set all digital TRISA = %110100 ; Set RA5,RA4 and RA2 input, rest output TRISB = %0000 ; PORT B all output TRISC = %00000000 ; PORT C all output CM1CON0 = 0 ' Disable comparator 1 CM2CON0 = 0 ' Disable comparator 2 led1 var portc.4 buton1 var porta.4 led1flag var bit low led1 let led1flag = 0 init: read 10,led1flag pause 2 main: if led1flag = 1 then high led1 else low led1 endif if buton1 = 0 then let led1flag = 1 goto writetoeeprom endif goto main writetoeeprom: write 10, led1flag pause 2 debounce: if buton1 = 0 then goto debounce goto init end
- 21st November 2016, 13:47
louislouis

Re: 16F690 read/write

Hello Richard,

basically this is my code without changes, but after try It isn't work. Then I try to replace the chip (the previous is an brand new out of the box) to another brand new and ...
... man all works, the trevious chip was faulty, two days of labour and time wasting. Thank You for all support .
- 17th December 2016, 09:21
Bums12

Re: 16F690 read/write

I can not delete my message.