This is a stripped down part of a larger program. Eventually I need to collect several temperatures over a period of time, and read them back later, after power-cycling the pic. I simply can't figure out what is going wrong. I have commented the listing at several points to explain what I am doing in this very simple routine. I have used extensive serout2 commands to see exactly what is going on - but they do not help my simple mind at this point. As I have commented in the listing, I can write, and then read back immediately to the on-board EEPROM, and everything works in two identical routines. However, trying the same code another time does not work. I'm sure there are probably postings here that will help, I just have not been able to find any yet. I noticed on this listing that the first read of TempF shows TEMPF as all caps , however that is not the way the actual listing is.
I am using PBP version 2.6a, and a 18f2520. The defines, etc are required for the complete program.
any and all comments will be most appreciated
Ken
I am using PBP version 2.6a, and a 18f2520. The defines, etc are required for the complete program.
any and all comments will be most appreciated
Ken
Code:
'****************************************************************
'* Name : RD / WRT TEST.BAS *
'* Author : KRS *
'* Date : 7/27/2012 *
'* Version : 1.0 *
'* Notes : USING PBP VERSION 2.60A PIC IS 18F2520 *
'* : I AM USING WEB4ROBOTS SERIAL KEYPAD AND LCD *
'* : REQUIRES DIFFERENT SEROUT2 COMMANDS *
'****************************************************************
'
DEFINE ADC_CLOCK 3
DEFINE ADC_SAMPLEUS 50
OSCTUNE.6 = 1
define OSC 4
OSCCON = %01101110
ADCON1 = %10001011 ' RIGHT JUSTIFY, PORTB ALL DIGITAL
TRISC = %10111000
TRISA = %11111111
TRISB = %00000011
MXSO VAR PORTC.0 ' SERIAL IN
MXCS VAR PORTC.1 ' CHIP SELECT
MXSCLK VAR PORTC.2 ' CLOCK
INT VAR PORTC.5 'Keyboard INT used to signal a key entry
TX var PORTC.6
Rx var PORTC.7
'Allocate MAX6875 Variables
MXTemp var word 'raw data from 6675/type K sensor
TempF var word 'Actual Farenheit temp
TempC var word
Y VAR BYTE
x var byte
Z VAR BYTE
TEMPF1 VAR WORD
TEMPF2 VAR WORD
'***************************************************************
' web4robots must be set-up first ! ! !
'****************************************************************
serout2 TX,84,[$FE,$02,3] 'SET BAUD RATE AT 9600
PAUSE 50
SEROUT2 TX,84, [$FE, $0A] 'Ensures that the display is on
pause 150 'Eliminate double key entry
SEROUT2 TX, 84, [$FE, $14] 'Ensures that the screen is cleared
PAUSE 100
SEROUT2 TX, 84, [$FE, $03, 20] 'Sets the brightness (0-250)
PAUSE 100
SEROUT2 TX, 84, [$FE, $04, 10] 'sets contrast (Low number = Hi Contrast)
PAUSE 100
serout2 TX,84,[$FE,$14] 'clear the screen
'
'*******************************************************
START:
PAUSE 2000
Y = 0
for x = 1 to 5
WRITE_temp: 'READ THE THERMOCOUPLE AND SAVE IT
MXCS = 0 'Chip select low
shiftin MXSO, MXSCLK, 0, [MXTemp\16] 'read the data to MXTemp
MXCS = 1 'Chip select high
TempC = MXtemp >> 5
TempF = (TempC*18)/10+32
pause 30
' READ THIS TEMPERATURE
SEROUT2 TX,84,[$FE,$0C,0,0,"TEMP= ",dec TEMPF]
PAUSE 3000
SEROUT2 TX,84,[$FE,$14] ' clears the display
PAUSE 50
'
' NOW WRITE IT TO EEPROM LOCATION IN VARIABLE Y
WRITE Y,WORD TEMPF
'
' IMMEDIATELY READ IT BACK - - THIS VALUE IS READ CORRECTLY ALL 5 TIMES
'
READ Y, WORD TEMPF1
SEROUT2 TX,84,[$FE,$0C,1,0,"READ TEMP= ",DEC TEMPF]
PAUSE 30
PAUSE 3000
SEROUT2 TX,84,[$FE,$14] ' clears the display
PAUSE 3
'******************************
' NOW READ IT BACK AND WRITE TO A DIFFERENT VARIABLE ( TEMPF1)
' THIS READ ALSO WORKS CORRECTLY ALL 5 TIMES
'*****************************
READ Y, WORD TEMPF1
PAUSE 50
SEROUT2 TX,84,[$FE,$0C,0,0,"READ1 TEMPF1= ",DEC TEMPF1]
PAUSE 30
SEROUT2 TX,84,[$FE,$0C,1,0,"X = ",dec x]
PAUSE 20
SEROUT2 TX,84,[$FE,$0C,2,0,"Y = ",dec Y]
PAUSE 3000
SEROUT2 TX,84,[$FE,$14] ' clears the display
pause 30
Y = Y + 1
next x
PAUSE 3000
'**********************************
' NOW TRY TO READ IT AGAIN, USING ANY VARIABLE DOES NOT MATTER , TEMPF1, ETC
' THE ONLY CORRECT READ HERE IS THE LAST ONE, (Y = 4)
'ALL OTHERS ARE INCORRECT - - VERY HIGH VALUES - - 23375, 22860, ETC
'*****************************************************************
Y = 0 'RESET THE EEPROM ADDRESS POINTER TO 0
FOR X = 1 TO 5
READ Y, WORD TEMPF2 ' USING VARIABLE TEMPF2 HERE, ANY OTHER VARIABLES
' DO NOT WORK EITHER
PAUSE 50
SEROUT2 TX,84,[$FE,$0C,0,0,"READ2 TEMPF2= ",DEC TEMPF2]
PAUSE 30
SEROUT2 TX,84,[$FE,$0C,1,0,"X = ",dec x]
PAUSE 30
SEROUT2 TX,84,[$FE,$0C,2,0,"Y = ",dec Y]
PAUSE 2000
SEROUT2 TX,84,[$FE,$14] ' clears the display
pause 30
Y = Y + 1
next x
DONE:
SEROUT2 TX,84,[$FE,$14] ' clears the display
PAUSE 50
SEROUT2 TX,84,[$FE,$0C,2,0,"DONE"]
pause 1000
GOTO DONE