Part Number: MSP430FR2476
Hi I'm recently trying to program the ADC in MSP430FR2476 with max. sampling rate but found some issues.
Steps:
1) configure the ADC at MCLK at 16 MHz;
2) configure the ADC in pulse-sample mode, repeat-single-channel, put the trigger source at ADCSC;
3) enable ADC interrupt and start the ADC sampling and conversion;
4) in the ADC interrupt service routine (ISR), check the ADCIFG and read the ADC data into a variable; check the index (# of samples) > N, and stop ADC.
However, the ADC doesn't jump into the ISR and gives nothing.
I attached the code below, please let me know if you guys can help. Thanks a lot.
// Code to debug Clock speeds and continous ADC sampling.
// Please refer the 'User guide for msp430fr2xxx family of micro controllers' from TI and 'msp430fr2476.h' to understand registers and their functions
#include <msp430fr2476.h>
#include <stdio.h>
unsigned int Mode, q, i, Rx_Data[2000];
void initGpio (void);
int main(void)
{
WDTCTL = WDTPW | WDTHOLD; // Stop Watch Dog Timer
initGpio(); // Call the GPIO initialization function
i=0;
//CSCTL4 |= SELA_1 | SELMS_3; // MCLK = SMCLK = VLO; ACLK = REFO
__bic_SR_register(0x0080); // LPM3 --> LPM0
CSCTL4 &= ~SELMS_3;
CSCTL4 |= SELMS_0 |SELA_0; // DCOCLKDIV for MCLK = SMCLK, and XT1CLK for ACLK
CSCTL3 |= SELREF_0;
// CSCTL3 |= SELREF_1;
CSCTL1 |= DISMOD_1 | DCOFTRIM | DCORSEL_5 | DCOFTRIMEN_1;
// Modulation disabled, frequency trimmed to highest value, DCOf = 16 MHz, Trimming enabled
__bic_SR_register(0x0040); // enable FLL
CSCTL0 |= 0x01FF; // DCO
printf("1 \n");
// Configure ADC
ADCCTL0 |= ADCSHT_0 | ADCON | ADCMSC; // ADCON, S&H=16 ADC clks
ADCCTL1 |= ADCSHP | ADCSHS_0 | ADCSSEL_2 | ADCCONSEQ_2; // pulse and sampl mode; ADCSC bit trigger; ADCCLK = SMCLK; repeat single channel;
ADCCTL2 &= ~ADCRES; // clear ADCRES in ADCCTL i.e 8-bit
ADCMCTL0 |= ADCINCH_3; // A3 ADC input select; Vref=DVCC
ADCIE |= ADCIE0; // Enable ADC conv complete interrupt
ADCCTL0 |= ADCENC | ADCSC; // Sampling and conversion start
}
void initGpio()
{
// Configure GPIO
P1DIR = 0xFF;
P2DIR = 0xFF;
P3DIR = 0xFF;
P4DIR = 0xFF;
P5DIR = 0xFF;
P6DIR = 0xFF;
P1OUT = 0x00;
P2OUT = 0x00;
P3OUT = 0x00;
P4OUT = 0x00;
P5OUT = 0x00;
P6OUT = 0x00;
// Select ADC input function on P1.3/A3
P1SEL0 |= BIT3;
P1SEL1 |= BIT3;
// Output MCLK and SMCLK on P1.3 and P1.7
P1SEL0 &= ~( BIT7);
P1SEL1 |= BIT7;
// Configure XT1 oscillator
P2SEL0 |= BIT0 | BIT1; // P2.0~P2.1: crystal pins
PM5CTL0 &= ~LOCKLPM5;
}
// ADC interrupt service routine
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=ADC_VECTOR
__interrupt void ADC_ISR(void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(ADC_VECTOR))) ADC_ISR (void)
#else
#error Compiler not supported!
#endif
{
switch(__even_in_range(ADCIV,ADCIV_ADCIFG))
{
case ADCIV_NONE:
break;
case ADCIV_ADCOVIFG:
break;
case ADCIV_ADCTOVIFG:
break;
case ADCIV_ADCHIIFG:
break;
case ADCIV_ADCLOIFG:
break;
case ADCIV_ADCINIFG:
break;
case ADCIV_ADCIFG:
Rx_Data[i] = ADCMEM0;
ADCIFG = 0;
i=i+1;
if (i == 40){
ADCCTL0 &= ~ADCENC;
printf("2 \n");
for (i=0; i<40; i++)
{
printf("%d \n",Rx_Data[i]);
}
}
break;
default:
break;
}
}
