MSP430F149 ADC with two channels

Development Boards MicroMod
1

Hello,

I have a problem, if I try to use ADC12MEM1 then I get no data.

I want to use channel P6.0 and P6.1 as AD-channel

here is my quelltext.

#include <msp430x14x.h>

#include <stdio.h>

unsigned char rf_buf[8],

unsigned int adc1,adc2;

void main(void) {

P6SEL |= 0x03; // Channel 1 + 2

ADC12CTL0 = REF2_5V + REFON + SHT0_2 + ADC12ON + MSC ;

ADC12CTL1 = SHP +CONSEQ_1; //if I use CONSEQ_1 then I have no interrupts

ADC12MCTL0 = SREF_1 + INCH_0; // Chanel 1

ADC12MCTL1 = SREF_1 + INCH_1; // Chanel 2

ADC12IE = 0x01; // ???

ADC12CTL0 |= ENC;

WDTCTL = WDT_ADLY_250;

IE1 |= WDTIE;

_EINT();

for (;:wink: {

_BIS_SR(LPM0_bits);

_NOP();

sprintf(rf_buf,“%d\r”,adc2); //

rf_poi = rf_buf;

}

}

interrupt [WDT_VECTOR] void wdt_isr(void) {

ADC12CTL0 |= ADC12SC;

}

interrupt[ADC_VECTOR] void ADC12ISR (void) {

adc1 = ADC12MEM0; // Memory 0 in the temp

adc2 = ADC12MEM1; // Memory 1 in the temp, but here I get no value

_BIC_SR_IRQ(LPM0_bits);

}

int __low_level_init(void) {

WDTCTL = WDTPW + WDTHOLD;

return 1;

}

I thank you fo the answer.

with best regards.

2

EugenBesel:
[…]

ADC12MCTL0 = SREF_1 + INCH_0; // Chanel 1

ADC12MCTL1 = SREF_1 + INCH_1; // Chanel 2

ADC12IE = 0x01; // ???

ADC12CTL0 |= ENC;

[…]

with best regards.

The ```
ADC12IE=0x1


You also need to add an EOS on MCTL1. A working example for 3 channels (just cut and pasted from a program I have lying around).

ADC12CTL0 = SHT0_5 | // 96 clock cycles sampling time. (ADC12CLK) = ~ 20uS
ADC12ON ; // turn on ADC.

ADC12CTL1 = CSTARTADD_0 | // Start at MCTL0
SHS_1 | // Use sampling timer Timer_A.OUT1
SHP | // Sample-and-Hold Pulse select.
0 | // ISSH_0. Do no invert signal.
ADC12DIV_0 | // divide clock by 1.
ADC12SSEL_0 | // Use internal 5Mhz clock (ADC12OSC).
CONSEQ_3 // Repeat sequence-of-channels.
;

ADC12MCTL0 = INCH_3; // Input channel 3 using Vcc and Vss as voltage reference.
ADC12MCTL1 = INCH_4; // channel 4.
ADC12MCTL2 = INCH_5 | EOS; // channel 5 and End of sequence.

ADC12IE = 1 << 2; // Enable interrupt when MCTL2 completes.

ADC12CTL0 |= ENC;


This actually used timerA to trigger the sampling. The timerA setup for completeness is

TACCR1 = 64; // raise interupt at 64 counts.
TACCTL1 = OUTMOD_2; // Toggle OUT_1 at CR1 and reset at at CR0
TACCR0 = 128; // Set period to 128 counts == 128/32Khz == ~ 4000 uS
TACTL = TASSEL_1 | // Use ACLK as clock. (32Khz)
MC_1; // Start timer and count up to TACCR0.