Delta 36-R31 User Manual download pdf (Page 83)

ACC-36E Manual

Appendix C: using Pointers 83

int ACC36E_ADC(unsigned int Card_Index, unsigned int ADC_Pair, unsigned int Polarity, int

*ADC_Low, int *ADC_High)

{ /*Inputs:

Card_Index: The addressing index (n) of the card, based on SW1 settings.

ADC_Pair: The number of the ADC pair one desires to sample. Pair 1: ADC 1 & 9, pair 2:

ADC 2 & 10

... pair 8: ADC 8 & 16

Polarity: 0 = sample as unipolar input signal, 1 = sample as bipolar input signal

*ADC_Low: Address of the variable the user wants to use to store the low ADC result (user

needs

to pass in &ADC_Low)

*ADC_High: Address of the variable the user wants to use to store the high ADC result

(user needs to pass in &ADC_High)

Outputs:

return 0 if ADC conversion was successful

return -1 if user entered invalid Card_Index

return -2 if user entered invalid ADC_Pair

return -3 if user entered invalid Polarity

return -4 if ADC conversion timed out

Function puts ADC result low into *ADC_Low and result high into *ADC_High if the

conversion was successful*/

unsigned int Address,BaseOffset,ConvertCode;

int WaitResult;

volatile unsigned int *pACC36E_ADC_ChSelect;

volatile unsigned int *pACC36E_Data_Read_Unipolar; // Unsigned for bipolar input signals

volatile int *pACC36E_Data_Read_Bipolar; // Signed for bipolar input signals

if(Card_Index < 0 || Card_Index > 15)

{

return -1;

}

if((ADC_Pair < 1) || (ADC_Pair > 8))

{

return -2;

}

if((Polarity != 0) && (Polarity != 1))

{

return -3;

}

if(Polarity == 0) // Unipolar input signal

{

ConvertCode = ADC_Pair - 1;

} else { // Bipolar input signal

ConvertCode = ADC_Pair + 7;

}

BaseOffset = pshm->OffsetCardIO[Card_Index];

Address = (unsigned int)piom + BaseOffset/4;

pACC36E_ADC_ChSelect = (volatile unsigned int*)Address;

// Shift and mask to write the convert code to the correct place in the ADC word

*pACC36E_ADC_ChSelect = ((ConvertCode) << 8) & 0xFFFFFF00;

// Wait for the ADC to finish converting

WaitResult = ACC36E_WaitForADC(Card_Index);

if(WaitResult == -1){ // If the ADC conversion timed out

return (-4); // Return with error code

} else { // Otherwise return ADC result

if(Polarity == 0)

{

pACC36E_Data_Read_Unipolar = (volatile unsigned int*)Address;

// Shift and cast to get just the ADC results with the proper signs

*ADC_Low = ((unsigned int)(((*pACC36E_Data_Read_Unipolar) << 12) >> 20));

*ADC_High = ((unsigned int)((*pACC36E_Data_Read_Unipolar) >> 20));

} else {

pACC36E_Data_Read_Bipolar = (volatile int*)Address;

// Shift and cast to get just the ADC results with the proper signs

*ADC_Low = ((int)(((*pACC36E_Data_Read_Bipolar) << 12) >> 20));

*ADC_High = ((int)((*pACC36E_Data_Read_Bipolar) >> 20));

}

return 0;

}

1 2 ... 78 79 80 81 82 83 84

Comments to this Manuals

No comments

Delta 36-R31 User Manual Page 83

Comments to this Manuals

Related products and manuals for Circular saws Delta 36-R31