Adcbuf

[tkpro]

Nguyên văn bởi namqn

Datasheet mô tả rằng ADC1BUF0 có địa chỉ là 0x300, chứ không phải có địa chỉ từ 0x300 đến 0x319.

Thân,

tôi đã down về và thử đoạn code này rồi.
chạy Ok đấy.
anh e cùng tham khảo nhé.

#if defined(__dsPIC33F__)
#include "p33fxxxx.h"
#elif defined(__PIC24H__)
#include "p24hxxxx.h"
#endif

#include "adcDrv1.h"
#include "tglPin.h"

#define SAMP_BUFF_SIZE 8 // Size of the input buffer per analog input
#define NUM_CHS2SCAN 4 // Number of channels enabled for channel scan

/*================================================= ============================
ADC INITIALIZATION FOR CHANNEL SCAN
================================================== ===========================*/
void initAdc1(void)
{

AD1CON1bits.FORM = 3; // Data Output Format: Signed Fraction (Q15 format)
AD1CON1bits.SSRC = 2; // Sample Clock Source: GP Timer starts conversion
AD1CON1bits.ASAM = 1; // ADC Sample Control: Sampling begins immediately after conversion
AD1CON1bits.AD12B = 0; // 10-bit ADC operation

AD1CON2bits.CSCNA = 1; // Scan Input Selections for CH0+ during Sample A bit
AD1CON2bits.CHPS = 0; // Converts CH0

AD1CON3bits.ADRC = 0; // ADC Clock is derived from Systems Clock
AD1CON3bits.ADCS = 63; // ADC Conversion Clock Tad=Tcy*(ADCS+1)= (1/40M)*64 = 1.6us (625Khz)
// ADC Conversion Time for 10-bit Tc=12*Tab = 19.2us

AD1CON2bits.SMPI = (NUM_CHS2SCAN-1); // 4 ADC Channel is scanned

//AD1CSSH/AD1CSSL: A/D Input Scan Selection Register
AD1CSSH = 0x0000;
AD1CSSLbits.CSS4=1; // Enable AN4 for channel scan
AD1CSSLbits.CSS5=1; // Enable AN5 for channel scan
AD1CSSLbits.CSS10=1; // Enable AN10 for channel scan
AD1CSSLbits.CSS13=1; // Enable AN13 for channel scan

//AD1PCFGH/AD1PCFGL: Port Configuration Register
AD1PCFGL=0xFFFF;
AD1PCFGH=0xFFFF;
AD1PCFGLbits.PCFG4 = 0; // AN4 as Analog Input
AD1PCFGLbits.PCFG5 = 0; // AN5 as Analog Input
AD1PCFGLbits.PCFG10 = 0; // AN10 as Analog Input
AD1PCFGLbits.PCFG13 = 0; // AN13 as Analog Input


IFS0bits.AD1IF = 0; // Clear the A/D interrupt flag bit
IEC0bits.AD1IE = 1; // Enable A/D interrupt
AD1CON1bits.ADON = 1; // Turn on the A/D converter

tglPinInit();

}

/*================================================= ============================
Timer 3 is setup to time-out every 125 microseconds (8Khz Rate). As a result, the module
will stop sampling and trigger a conversion on every Timer3 time-out, i.e., Ts=125us.
================================================== ===========================*/
void initTmr3()
{
TMR3 = 0x0000;
PR3 = 4999;
IFS0bits.T3IF = 0;
IEC0bits.T3IE = 0;

//Start Timer 3
T3CONbits.TON = 1;

}

/*================================================= ============================
ADC INTERRUPT SERVICE ROUTINE
================================================== ===========================*/
int ain3Buff[SAMP_BUFF_SIZE];
int ain4Buff[SAMP_BUFF_SIZE];
int ain10Buff[SAMP_BUFF_SIZE];
int ain13Buff[SAMP_BUFF_SIZE];

int scanCounter=0;
int sampleCounter=0;

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

switch (scanCounter)
{
case 0:
ain3Buff[sampleCounter]=ADC1BUF0;
break;

case 1:
ain4Buff[sampleCounter]=ADC1BUF0;
break;

case 2:
ain10Buff[sampleCounter]=ADC1BUF0;
break;

case 3:
ain13Buff[sampleCounter]=ADC1BUF0;
break;

default:
break;

}

scanCounter++;
if(scanCounter==NUM_CHS2SCAN) {
scanCounter=0;
sampleCounter++;
}

if(sampleCounter==SAMP_BUFF_SIZE)
sampleCounter=0;

tglPin(); // Toggle RA6
IFS0bits.AD1IF = 0; // Clear the ADC1 Interrupt Flag

}