vinke

Hi ,
Im doing a project using PIC16877A,and im having problems with displaying data on seven segments display. The interrupt is not working either.I have three push buttons,one for the interrupt,one as an enter key to validate entered data,and the last to increment data(push button3).Im dispalying the channel from with the analog value is coming from and the max & min preset value for relative soil moisture(0-99).The program is supposed to work like this:
(i) program runs normally ,i.e,the analog value is being read and compared frequently until the int pin is high,i.e,the push button is bieng pressed,then
(ii) program is transfered to int service routine where ,it allow the user to select the channel,presently only one channel is used but more will be used.So,the channel number should be displayed and when user press the increment key,push button3, the channel number should be incremented and displayed.Same for the maximum and minimum preset value
(iii)then program should return to main after each entered data has been validated using the 'enter' key and continue with the new preset min&max value

Here is the code.whats going wrong?please help.Note the main program is ok,only the interrupt and displaying data which is causing problems
'************************************************* ************************************************** ***********
'* This program is intended for microcontroller PIC16F877A *
'* The microcontroller will read voltages coming from a soil moisture sensor on its analog channel 1*
'* and compare them with minimum and maximum values. If an analog input is less than the minimum preset value *
'* the microprocessor will output a '1' on a respective pin of portD,and it will remain '1' until the analog *
'* input exceeds the maximum preset value.These low and high logic will be used to stop and start irrigation *
'* respectively. *
'* *
'* External Interrupt INT is used to set the maximum and minimum preset values,else default values already stored in rom is used* *
'* 3 Multiplexed seven segment displays are used to display the channel(provision to add more channels in the future) and relative moisture level(0% to 99%). *
'* ************************************************** ************************************************** ********
program Auto_irrigation
dim actual_moist1 as word
dim maxmoisture as word ' register to store maximum moisture setting
dim minmoisture as word 'register to store minimum moisture setting
dim b as byte
dim m as byte ' m points to maxmimum and minimum values of moisture level as percentage(0-99)
dim channel as byte
dim data0,data1,data2 as byte
dim count as word
'************************************************* ******************************
sub function mask(dim num as byte) as byte ' this function returns mask
' of parameter 'num'
select case num ' for common cathode 7-seg. display
case 0 result = $3F
case 1 result = $06
case 2 result = $5B
case 3 result = $4F
case 4 result = $66
case 5 result = $6D
case 6 result = $7D
case 7 result = $07
case 8 result = $7F
case 9 result = $6F
end select'case end
end sub
'************************************************* *****************************
sub function mask1(dim dig as byte) as byte ' this function returns mask
' of parameter 'num'
select case dig ' for common cathode 7-seg. display
case 0 result = $3F
case 1 result = $06
case 2 result = $5B
case 3 result = $4F
case 4 result = $66
case 5 result = $6D
case 6 result = $7D
case 7 result = $07
case 8 result = $7F
case 9 result = $6F
end select'case end
end sub
'************************************************* *****************************
sub procedure prepare_digit 'this routine prepares digit to be displayed
data0=mask(channel)
b=m mod 10 'prepares ones digit
data1=mask(b)
b= (m div 10)mod 10 'prepares tens
data2=mask(b)
end sub
'************************************************* *****************************
sub procedure prepare_digit1 'this routine prepares digit to be displayed
data0=mask1(channel)
b=m mod 10 'prepares ones digit
data1=mask1(b)
b= (m div 10)mod 10 'prepares tens
data2=mask1(b)
end sub
'************************************************* ****************************
sub procedure display 'this routine displays digits
PORTC= data0
PORTB=%00010000
PORTC=data1 ' data0 is the channel number
PORTB=%00100000 ' data1 and data2 forms the two digit number
PORTC=data2 'representing moisture level(0-99)
PORTB=%01000000
'data1 is the ones and data2 the tens
PORTB=0
end sub
'************************************************* ******************************
sub procedure intermede 'this sub provides a delay and displays the
count=$32 'symbol -- on the moisture level display
while count<>0
data1=$40 'mask for symbol -
data2=$40 'mask for symbol -
display
dec(count)
wend
end sub
'************************************************* ******************************
sub procedure select_channel 'this sub allow the user to choose channel
while PORTB.1 <> 1
if PORTB.2 <>1 then
data1= $39 ' mask for letter C ''' to display SC(Select Channel)
data2= $6D 'mask for for letter S '''
display
end if
if PORTB.2=1 then
inc(channel)
if channel<=7 then
data0=mask(channel)
data1= $39
data2= $6D
display
else
channel=0
data0=mask(channel)
data1= $39
data2= $6D
display
end if
end if
wend
intermede
end sub


'************************************************* ************************************
sub procedure MINMAX 'MINMAX allows the user to set the min and max
while PORTB.1 <> 1 'moisture level for the selected channel
if PORTB.2<>1 then 'Maximum moisture level is set first then min
prepare_digit
display
end if
if PORTB.2=1 then
inc(m)
if m<=99 then
prepare_digit
display
else
m=0
prepare_digit
display
end if
end if
wend
maxmoisture=(m*31) div 3
intermede
while PORTB.1 <> 1
if PORTB.2<>1 then
prepare_digit
display
end if
if PORTB.2=1 then
inc(m)
if m<=99 then
prepare_digit
display
else
m=0
prepare_digit
display
end if
end if
wend
minmoisture=(m*31) div 3
intermede
end sub
'************************************************* ******************************
sub procedure settings
while PORTB.1<>1
select_channel
MINMAX
wend
end sub

'************************************************* ******************************
'************************************************* ******************************

sub function minmoist(dim i as byte) as word 'funtion which returns the default value of minimum moisture
if minmoisture=0 then 'level for each channel if no value has been stored.
result=613 'the default minimum moisture level is 60%
end if
end sub
'************************************************* ******************************
'************************************************* *******************************
sub function maxmoist(dim j as byte) as word 'function which returns the default value of maximum moisture
if maxmoisture=0 then 'level for each channel if no value has been stored
result=972 'the default maximum moisture level is 95%
end if
end sub
'************************************************* *****************************
sub procedure channel_read

actual_moist1= ADc_read(1) 'Reading analog input

if actual_moist1>maxmoist(1) then
PORTD.0=0
end if
if actual_moist1<minmoist(1) then
PORTD.0=1
end if


end sub
'************************************************* ****************************
sub procedure interrupt
settings
intcon=$90
PORTC=0
end sub

main: 'main program
nop
TRISA=$FF ' PortA configured as input
TRISB=$07 'Pins RB0-RB3 configured as input and RB4-RB7 as output
TRISC=0 'PORT C configured as output
TRISD=0 'PORt D configured as output

ADCON1=$80 'PortA configured as analog input
intcon=$90 ' Global interrupt and INT enabled,and all other interrupts disabled
while true
channel_read
wend
end.

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ericgibbs

hi,
Post the program as a *.asm file or 'select' the program text in the post and use the menu bar '#' and place code quotes around the text.

In that way we can simply paste into our test assemblers, OK

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vinke

Ive attached the asm file.thanks

Attached Files

Auto_irrigation.asm (32.3 KB, 5 views)

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gramo

Multiple routines like above can be easily "debugged" with a UART output indicating the PIC's current position/readings/registers at certain points throughout the program.

UART is very easy to learn with higher languages, such as PICbasic, and if you have a computer with Hyperterminal and a COM port, then your 50% of the way there...

Use the "#" button in the text editor next time to "code" wrap your program, that way all of the tabbed lines/extra spaces will not be removed

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