Microchip Technology ARD00330 数据表

DS39979A-page 292

 2010 Microchip Technology Inc.

/////////////////////////////////////////////////////////////////////////////////////////////
// STEP 7: Reading AFE results in Interrupt Routine.
// ADC is configured in 16-bit result mode, thus 16-bit result of each Channel can be read.
// In this example DR is connected to INT0; after each convesion, DR issues interrupt to INT0.
// INT0 is configured as high priority interrupt
////////////////////////////////////////////////////////////////////////////////////////////

#pragma interrupt High_isr_routine
void High_isr_routine(void)
{
char

D_S_ADC_data1=0,D_S_ADC_data2=0,D_S_ADC_data3=0,D_S_ADC_data4=0,Dummy_Read=0;

if((INTCONbits.INT0IF)&&(INTCONbits.INT0IE))
{

//  Disable all Chip selects of other devices connected to SPI
LATDbits.LATD7=0;

//Chip select enable for Delta Sigma ADC

SSP1BUF = 0x01;

//Address and Read command for Channel0 result MSB register

while(!SSPSTATbits.BF);
Dummy_Read=SSPBUF;

//Dummy read to clear Buffer Full Status bit

SSPBUF =0x00;
while(!SSPSTATbits.BF);
D_S_ADC_data1=SSPBUF;

//Data from Channel0 MSB

SSPBUF = 0x00;
while(!SSPSTATbits.BF);
D_S_ADC_data2=SSPBUF;

//Data from Channel0 LSB, Address automatically incremented

SSPBUF = 0x00;
while(!SSPSTATbits.BF);
D_S_ADC_data3=SSPBUF;

//Data from Channel1 MSB, Address automatically incremented

SSPBUF = 0x00;
while(!SSPSTATbits.BF);
D_S_ADC_data4=SSPBUF;

//Data from Channel1 LSB, Address automatically incremented

LATDbits.LATD7=1;

//Disable chip select after read/write of registers

INTCONbits.INT0IF=0;

//Clear INT0IF for next interrupt

}

}

#pragma code High_isr=0x08
void High_ISR(void)
{
 _asm goto High_isr_routine _endasm

}