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PIC16F877a channel switching Problem

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PIC16F877a ADC channel switching Problem

Hello,
I'm using MPLAB V8.3 version. Im having problem with 2 ADC input conversion.. while Proteus running getting this message and while Hardware, it clashes two channels..
ADC conversion started before 'wait' time has expired following previous conversion or channel change
Code: 
ADCON0=0x05;
ADCON1=0xC0;
while(ADGO);

ADCON0=0x0D;
ADCON1=0xC0;
while(ADGO);
Give solution. Please...
 

Try "GO_nDONE" as the bit to test, that is what it is named in MPLABX 4.05 but it is probably the same in MPLAB 8.3.
It is better to fully qualify the name as "ADCON0.GO_nDONE" in case ADGO is just a bit number definition.

Brian.
 

betwixt said:
Try "GO_nDONE" as the bit to test, that is what it is named in MPLABX 4.05 but it is probably the same in MPLAB 8.3.
It is better to fully qualify the name as "ADCON0.GO_nDONE" in case ADGO is just a bit number definition.

Brian.
Click to expand...

Thanks,
But V8.3 Hitech compiler says, Undefined identifier.....
 

Try ADCON0.ADGO then. I use the XC compilers so I can't check bit definitions on Hitech programs.
The problem I find when converting some source files is for example, ADGO might be defined as '0' because that's it's bit position in the ADCON register but when written in source code it would be used only as that number without reference to the register. That would make your line:
Code: 
while(ADGO);
translate to:
Code: 
while(0);
which obviously would cause your problem.

Brian.
 

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