MX7705 or AD7705 experience
I´m using MX7705/AD7705 who has 2 input chanals, each can recieve 16 bit data.
The code belov is running for canal 0 ($38) or 1 ($39), but not if I use chanal 0 and 1 at the “same” time (as the code belov).
Hovever if I make a breake at 1 sekund (!!!!) betveen the reading at chanal 0 and 1 the code is running.
I would like to know if anyone here has experience with 7705 and can tell me vhat I am doing wrong.
Thank you in edvance
FM11
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' Oscillator : XT
' Watchdog Time : Off
' Power Up Time : On
DEFINE OSC 4
DEFINE LCD_LINES 4
'AD7705
Symbol SCK=PORTC.4 'Clock pin
Symbol SO=PORTC.6 ' AD7705 Data out pin.
Symbol SI=PORTC.5 ' AD7705 Data in pin
Output portc.4
Output portc.6
Input portc.5
Input portc.3
'AD7705
Send var Byte 'byte sent to communication register of AD7705
rec var Byte 'byte received from AD7705nly for communication register, set-up register and clock register (8 bit registers)
ready var Byte 'AD7705 Ready BIT
ad var Word 'ad converter value read from AD7705
ad2 var Word 'ad converter value read from AD7705
Clear 'clear all variables
pause 1000
Lcdout $FE, 2, "Test 60" ' linie 1
pause 2000
'MX7705
gosub MX7705Ini
Lcdout $FE, 2, " " ' Linie 1
countd var word
countd=0
loop:
'AD7705
While portc.3=1 'wait for valid data to be received
countd=countd+1
Lcdout $FE, 2, "Count:", dec countd ' linie 1
Wend 'wait for valid data to be received
Send=$38 ' Read the 16 bit DATA Register, channel 0.
shiftout SI, SCK, 5, [Send\8] ' Send read command and data register address
shiftin SO, SCK, 6, [ad\16] ' Read 16 bit data
Lcdout $FE, $c0, " " ' Linie 3
Lcdout $FE, $c0,"V:", dec ad ' Linie 3
'pause 1000
While portc.3= 1 'wait for valid data to be received
countd=countd+1
Lcdout $FE, 2, "Count:", dec countd ' linie 1
Wend 'wait for valid data to be received
Send=$39 ' Read the 16 bit DATA Register, channel 1.
shiftout SI, SCK, 5, [Send\8] ' Send read command and data register address
shiftin SO, SCK, 6, [ad\16] ' Read 16 bit data
Lcdout $FE, $90," " ' Linie 2
Lcdout $FE, $90,"Amp:",dec ad ' Linie 2
if countd>60000 then countd=0
GoTo loop
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MX7705Ini:
'Reset MX7705
Send=$ff
rec=$ff
shiftout SI, SCK, 5, [Send\8] ' Send command to communication register
shiftout SI, SCK, 5, [rec\8] ' Send value to the selecte register
shiftout SI, SCK, 5, [Send\8] ' Send command to communication register
shiftout SI, SCK, 5, [rec\8] ' Send value to the selecte register
'AD7705 set-up Start.
Send=$20 ' WRITE TO THE COMMUNICATIONS REGISTER. SELECT CHANNEL 1 AND SET NEXT OPERATION AS A WRITE TO THE
' CLOCK REGISTER.(0x20)
' Send=$21 ' WRITE TO THE COMMUNICATIONS REGISTER. SELECT CHANNEL 0 AND SET NEXT OPERATION AS A WRITE TO THE
' CLOCK REGISTER.(0x21)
shiftout SI, SCK, 5, [Send\8] ' Send command to communication register
' rec=$0C ' write on clock register: clock division=1, clock bit=1, master clock enabled (bit set to 0),
' bit output rate set to 50hz.
rec=$0f ' write on clock register: clock division=1, clock bit=1, master clock enabled (bit set to 0),
' bit output rate set to 500hz
shiftout SI, SCK, 5, [rec\8] ' Send value to the selecte register
'Calib 'self-calibration
Send=$10 ' WRITE TO THE COMMUNICATIONS REGISTER. SELECT CHANNEL 1 AND SET NEXT OPERATION AS A WRITE TO THE SETUP REGISTER.(0x10).
' Send=$11 ' WRITE TO THE COMMUNICATIONS REGISTER. SELECT CHANNEL 0 AND SET NEXT OPERATION AS A WRITE TO THE SETUP REGISTER.(0x10).
shiftout SI, SCK, 5, [Send\8] ' Send command to communication register
'rec=$46 ' write $46 (bin 01000110) on Setup Register (tabel 9):01=enable self calibration,PGA Gain 1, 1=unipolar operation,
' 1=buffer control on, 0= enable filter synchronization
rec=$44 ' WRITE TO THE SETUP REGISTER. SET SELF-CALIBRATION MODE, GAIN TO 0, UNIPOLAR MODE, UNBUFFERED MODE.
' BEGIN SELF-CALIBRATION/CONVERSION BY CLEARING FSYNC.(0x44)
shiftout SI, SCK, 5, [rec\8] ' Send value to the selecte register
While portc.3=1:Wend 'wait for valid data to be received. Er angivet under self calibration mode.
' Note that after the self calibration, AD7705 start free conversion cycle.
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