Микропроцессорная техника Сторожок / CE135_SPI_Demo_14aug09 / CE135_SPI_Demo / adcDrv1

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#include "p33fxxxx.h"
#include "adcDrv1.h"
#include "commonvars.h"

volatile unsigned int ADC_Result;
//volatile unsigned char adc_lcd_update;
/*=============================================================================
ADC INITIALIZATION FOR CHANNEL SCAN
=============================================================================*/
void initAdc1( void )
{

	/* set port configuration here */ 		
 	AD1PCFGLbits.PCFG4 = 0;			// ensure AN4/RB4 is analog (Temp Sensor)
 	AD1PCFGLbits.PCFG5 = 0;			// ensure AN5/RB5 is analog (Analog Pot)
	AD1PCFGLbits.PCFG8 = 0;			// ensure AN8/RB8 is analog (PGA output)
 
 	/* set channel scanning here, auto sampling and convert, 
 	   with default read-format mode */
	AD1CON1 = 0x00E4;
	/* select 10 or 12-bit, 1 channel ADC operation */
	AD1CON1bits.AD12B = 1;	// uncomment this, comment below to make a 12 bit ADC
//	AD1CON1bits.AD12B = 0;	// uncomment this, comment above to make a 10 bit ADC
	
	/* No channel scan for CH0+, Use MUX A,  
	   SMPI = 16 per interrupt, Vref = AVdd/AVss */
	AD1CON2 = 0x003C;
	
	/* Set Samples and bit conversion time */
//	AD1CON3 = 0x032F;	// lets try to speed up conversions 
	AD1CON3 = 0x0404; 
        	
	/* set channel scanning here for AN4 and AN5 */
	AD1CSSL = 0x0000;
	
	/* channel select AN5 */
	AD1CHS0 = 0x0005;
	
	/* reset ADC interrupt flag */
	IFS0bits.AD1IF = 0;           

	/* enable ADC interrupts, disable this interrupt if the DMA is enabled */	  
	IEC0bits.AD1IE = 1;       

	/* turn on ADC module */
	AD1CON1bits.ADON = 1;          	

}
/*=============================================================================  
Timer1 Initialization
=============================================================================*/

void initTmr1() {
	TMR1 = 0;
	PR1 = 0xFFFF;
	T1CONbits.TCKPS = 3;
	T1CONbits.TON = 1;
	IEC0bits.T1IE = 1;
}
/*=============================================================================  
PortA Initialization
=============================================================================*/

void initPortA() {
	TRISA = 0xFF00;
	TRISD = 0xFFFF;
	TRISBbits.TRISB2 = 0;	// just make this an output
	PORTBbits.RB2 = 1;	// make it hi to spoof CS
}

/*=============================================================================  
SPI1 INTERRUPT SERVICE ROUTINE (clk polarity is high, Master)
=============================================================================*/
void Init_SPI1() {  // since sending only, no need for INTS.
	SPI1CON1 = 0x057A;	// 0000 0000 0111 1111
	SPI1STATbits.SPIROV = 0;		// Clear Overflow bit
	SPI1STATbits.SPIEN = 1;			// Enable the peripheral
}
/*=============================================================================  
ADC INTERRUPT SERVICE ROUTINE
=============================================================================*/


void __attribute__((interrupt, no_auto_psv)) _ADC1Interrupt(void) {

// I want to stick the ADC result into a register for use later.
	ADC_Result = ADC1BUF0;
    IFS0bits.AD1IF = 0;		//Clear the DMA0 Interrupt Flag
}