Passing ptr to array of Unions

[PIC1000]

Trying to create a buffer for a multi chan ADC. The single chan union code works fine. I want to create a function that takes a rolling average of each ADC chan. Ideally it would pass a pointer to each chan of ADCBuf, that is ADCBuf[0] then ADCBuf[1].... The function would then average the number of samples in each chan and then return the averged value. Note: the return has not been added yet!

When a multichan version is added and a function as well, it does not compile. I have done this sort of thing in asm in the past using "pointers" without a problem.

Using CCS ver 3.222, on a PIC16F767. Any problems? The basic code is sumitted for clarity.
[code]

#Define ADCBUFSAMPLESIZE 8 //ADC buffer (byte)size
#Define ADCMAXCHAN 2

void AvgADCChan(union ADCBufSample *ADCBuf);
//////////////////////Global Variables////////////////////////

unsigned char ADCSample=0;
unsigned char ADC_Chan=0;

union ADCBufSample{
unsigned char ADCBytes[ADCBUFSAMPLESIZE];
int16 ADCWords[ADCBUFSAMPLESIZE/2];
}ADCBuf[ADCMAXCHAN];//, *ADSample=ADCSample;



////////// INTERUPTS ///////////////////////////

///// ADC Int ////

#int_AD
void ADCISR( ) {
ADCBuf[ADC_Chan].ADCBytes[ADCSample++]=ADRESL;
ADCBuf[ADC_Chan].ADCBytes[ADCSample--]=ADRESH;
PIR1=PIR1& 0b10111111; //clear ADC int flag
}//end ADC it


AvgADCChan(ADCBuf); //basic fn call in main

/////////////////////////////////////////////////////////////////////

void AvgADCChan(union ADCBufSample *ADCBuf){
int16 Temp; //test code
Temp=0;
Temp=Temp+1;

}

It seems to complain on the function itself with the following errors:

[code]
Executing: "C:\Program files\Picc\CCSC.exe" "SerialLCDStringTestMulti ADC chan ver D.c" +FM +DF +LN +T -A +M +Z +Y=9 +EA
*** Error 33 "E:\pic\C Projects\New Folder\SerialLCDStringTestMulti ADC chan ver D.c" Line 68(36,48): Expecting a {
*** Error 48 "E:\pic\C Projects\New Folder\SerialLCDStringTestMulti ADC chan ver D.c" Line 68(37,43): Expecting a (
*** Error 43 "E:\pic\C Projects\New Folder\SerialLCDStringTestMulti ADC chan ver D.c" Line 68(44,45): Expecting a declaration
*** Error 58 "E:\pic\C Projects\New Folder\SerialLCDStringTestMulti ADC chan ver D.c" Line 147(12,18): Expecting a close paren
*** Error 29 "E:\pic\C Projects\New Folder\SerialLCDStringTestMulti ADC chan ver D.c" Line 397(37,43): Function definition different from previous definition
*** Error 43 "E:\pic\C Projects\New Folder\SerialLCDStringTestMulti ADC chan ver D.c" Line 397(44,45): Expecting a declaration
*** Error 48 "E:\pic\C Projects\New Folder\SerialLCDStringTestMulti ADC chan ver D.c" Line 399(1,5): Expecting a (
*** Error 43 "E:\pic\C Projects\New Folder\SerialLCDStringTestMulti ADC chan ver D.c" Line 399(6,7): Expecting a declaration
*** Error 43 "E:\pic\C Projects\New Folder\SerialLCDStringTestMulti ADC chan ver D.c" Line 399(7,8): Expecting a declaration
*** Error 48 "E:\pic\C Projects\New Folder\SerialLCDStringTestMulti ADC chan ver D.c" Line 400(1,5): Expecting a (
*** Error 48 "E:\pic\C Projects\New Folder\SerialLCDStringTestMulti ADC chan ver D.c" Line 400(6,10): Expecting a (
*** Error 43 "E:\pic\C Projects\New Folder\SerialLCDStringTestMulti ADC chan ver D.c" Line 400(11,12): Expecting a declaration
*** Error 43 "E:\pic\C Projects\New Folder\SerialLCDStringTestMulti ADC chan ver D.c" Line 400(12,13): Expecting a declaration
*** Error 43 "E:\pic\C Projects\New Folder\SerialLCDStringTestMulti ADC chan ver D.c" Line 402(1,2): Expecting a declaration
14 Errors, 0 Warnings.
[/code]

When I remove the function and it's caller, it compiles and the union is created as normal,8 bytes of 2 chans>Actually only 4 samples/chan, will change wording later!

[Ttelmah]

Declare the union, before you declare the prototype function.

Best Wishes

[PIC1000]

Yes that was it! Silly me.

Tankx

[Ttelmah]

This is the sort of area, where the poor 'error reporting' by the compiler, is really annoying. You'd think that if it does not know what the union 'is', it should post an error message that actually says something about this, but unfortunately it doesn't!... :-(

Best Wishes