Tool/software: Code Composer Studio
Hi, i was able to code a ADC ISR which is triggered by a timer CC ISR with 1 analog input.
I have been trying to code a ADC for 2 pins for some days but wasnt able so far.
the timer ISR is triggered by capture compare mode.
inside my timer ISR i want to make a ADC of my A3 pin and save it to the cariable temp1.
after the 1st ADC i tryed to switch the channel to A4 but the channel never switches.
i have also tryed to switch the channel inside my ADC interrupt but that didnt work aswell.
this is my code: (i hope someone could help me)
#include <msp430.h>
#include <msp430g2553.h>
long temp1;
long temp2;
void main(void) {
__enable_interrupt();
WDTCTL = WDTPW | WDTHOLD; // Stop watchdog timer
TACTL = TASSEL_1 + MC_1; // ACLK-clock + CCR up mode mode
CCTL0 = CCIE; // CCR0 Interrupt enabled
CCR0 = 50;
ADC10CTL1 = INCH_4 + ADC10SSEL_1; // Channel select A4 + Conversion sequence mode select == Sequence-of-channels + ACLK - clock (no input div)
ADC10CTL0 = SREF_0 + ADC10SHT_2 + ADC10ON + ADC10IE; // REF = VCC & VSS + ADC SampleAndHoldTime 16 x ADC10CLKs + + //
ADC10AE0 |= BIT3 + BIT4; // These bits enable the corresponding pin for analog input
P1SEL |= BIT3 + BIT4; // ADC input select mode P1.4
P1DIR |= 0x00; // ADC input P1.3
P2DIR |= (BIT0 + BIT1 + BIT2) + (BIT3 + BIT4 + BIT5); // pins as output // P2.0-2 for A3 + P2.3-5 for A4
P2OUT = 0x00; // all pins set to low (input) //port2
}
#pragma vector = TIMER0_A0_VECTOR;
__interrupt void Timer(void){
ADC10CTL1 = INCH_3; // select channel A3 for ADC
ADC10CTL0 |= ADC10SC + ENC; // ADC10SC == 0 >> no sample start conversation + ENC == EnableConversation
temp1 = ADC10MEM; // saves the ADC measure in 1st temp variable
while(!ADC10BUSY) // wait till ADC is NOT busy anymore
{
ADC10CTL0 &= ~ENC; // disable conversation
}
ADC10CTL0 &= ~ADC10IFG; // deletes the ADC-InterruptFlag for the next conversation
ADC10CTL1 = INCH_4; // select channel A4 as input
ADC10CTL0 |= ADC10SC + ENC;
if(ADC10CTL1 == INCH_4)temp2 = ADC10MEM; // save ADC measure in 2nd temp variable
while(!ADC10BUSY)
{
ADC10CTL0 &= ~ENC;
}
//TACTL &= ~TAIFG; // deletes Timer FLag (it will be automatic set by the timer >> when cotinues mode reaches 0xFFFFx)
}
#define A0 0x00
#define A1 BIT0
#define A2 BIT0 + BIT1
#define A3 BIT0 + BIT1 + BIT2
#define B0 0x00
#define B1 BIT3
#define B2 BIT3 + BIT4
#define B3 BIT3 + BIT4 + BIT5
#pragma vector = ADC10_VECTOR;
__interrupt void ADC(void){
const int output1[4] = {A0, A1, A2, A3};
const int output2[4] = {B0, B1, B2, B3};
if(temp1 >= 0 && temp1 <= 50)P2OUT = output1[0];
else if(temp1 >= 50 && temp1 <= 400) P2OUT = output1[1];
else if(temp1 >= 400 && temp1 <= 750) P2OUT = output1[2];
else P2OUT = output1[3];
if(temp2 >= 0 && temp2 <= 50)P2OUT |= output2[0];
else if(temp2 >= 50 && temp2 <= 400) P2OUT |= output2[1];
else if(temp2 >= 400 && temp2 <= 750) P2OUT |= output2[2];
else P2OUT |= output2[3];
ADC10CTL1 = INCH_4; // select channel A4 as input
}
