PID_Control_C.c

//Written by Emily Nobes
//March 2023
//PIC Control for a Thermo-Electric Cooling Unit

#include "io430.h"

#define ON 1 
#define OFF 0 
#define DELAY 20000
#define ASCII_CR 0x0D 
#define ASCII_LF 0x0A
#define BUTTON P1IN_bit.P3

#define GREEN_LED P1OUT_bit.P0 
#define RED_LED P1OUT_bit.P6

#define NPOINTS 400
unsigned char v[400];

void delay (unsigned long d)
{
  while (d--);
}

#pragma vector = PORT1_VECTOR
__interrupt void PORT1_ISR(void) {
    GREEN_LED = OFF;
    P1IFG_bit.P3 = 0;    // clear the interrupt request flag 
} 
void Init_UART(void)
{ 

//configure P1.1and P1.2 for secondary peripheral function
  
P1SEL_bit.P1 = 1; 
P1SEL2_bit.P1 = 1; 
P1SEL_bit.P2 = 1; 
P1SEL2_bit.P2 = 1;

// use x16 clock
UCA0BR1 = 0; 
UCA0BR0 = 9;

UCA0MCTL_bit.UCOS16 = 1;

//select UART clock source 
UCA0CTL1_bit.UCSSEL1 = 1; 
UCA0CTL1_bit.UCSSEL0 = 0;

//release UART RESET 
UCA0CTL1_bit.UCSWRST = 0;
}

unsigned char getc(void)
{
  while (!IFG2_bit.UCA0RXIFG);
  return (UCA0RXBUF);
}

void putc(unsigned char c)
{
  while (!IFG2_bit.UCA0TXIFG);
  UCA0TXBUF = c;
}

void puts(char *s)
{
  while (*s) putc(*s++);
}

void newline(void)
{
  putc(ASCII_CR);
  putc(ASCII_LF);
}

void itoa(unsigned int n)
{
  unsigned int i;
  char s[6] = "    0";
  i = 4;
  while (n)
  {
    s[i--] = (n % 10) + '0';
    n = n / 10;
  }
  puts(s);
}

void Init_ADC(void)
{
// initialize 10-bit ADC using input channel 4 on P1.4Send(NPOINTS);
// use Mode 2 - Repeat single channel
ADC10CTL1 = INCH_4 + CONSEQ_2; // use P1.4 (channel 4)
ADC10AE0 |= BIT4; // enable analog input channel 4
//select sample-hold time, multisample conversion and turn
//on the ADC
ADC10CTL0 |= ADC10SHT_0 + MSC + ADC10ON;
// start ADC
ADC10CTL0 |= ADC10SC + ENC;
}


int i = 0; 
void Sample(int n) // TO COMPLETE
{
 for(i = 0; i<=n;i++)
   v[i] = (ADC10MEM >> 2); 
}

void Send(int n) // TO COMPLETE
{
 for(i = 0; i<=n;i++)
   putc(v[i]); 
}


void Init(void) 
{ 
//Stop watchdog timer to prevent timeout reset 
WDTCTL = WDTPW + WDTHOLD;

DCOCTL = CALDCO_16MHZ; 
BCSCTL1 = CALBC1_16MHZ;

//P1REN = 0x08; //enable output resistor 
P1OUT = 0x08; //enable P1.3 pullup resistor 
P1DIR = 0x41; //setup LEDs as output 
P1IE_bit.P3 = 1; //enable interrupts on P1.3 input
}
 
//in1 High, in2 0 is hot 
//in1 Low, in2 0 is cold 

int heat(int duty) {
    P2DIR = 0xFF;
    P2SEL = 0;
    P2SEL2 = 0;
    P2OUT_bit.P6 = 0xFF;
    
    P1DIR |= BIT6; //Set pin 1.6 to the output direction.
    P1SEL |= BIT6; //Select pin 1.6 as our PWM output.
    TA0CCR0 = 1000; //Set the period in the Timer A0 Capture/Compare 0 register to 1000 us.
    TA0CCTL1 = OUTMOD_7;
    TA0CCR1 = duty; 
    TA0CTL = TASSEL_2 + MC_1; 
}


int cool(int duty) {
    P2DIR = 0xFF;
    P2SEL = 0;
    P2SEL2 = 0;
    P2OUT_bit.P6 = 0;
    
    P1DIR |= BIT6; //Set pin 1.2 to the output direction.
    P1SEL |= BIT6; //Select pin 1.2 as our PWM output.
    TA0CCR0 = 1000; 
    TA0CCTL1 = OUTMOD_7;
    TA0CCR1 =  TA0CCR0 - duty; 
    TA0CTL = TASSEL_2 + MC_1;
}



void main(void) 
{
    Init(); 
    Init_UART(); 
    Init_ADC();
    unsigned char dc ;
    unsigned char tc ;
    //cool(900);

    
while(1) 
{
    getc(); //activating 
    Send(NPOINTS);
    Sample(NPOINTS);
    tc = getc();
    dc = getc(); // duty cycle 
    if (tc == 'h') {
      heat(dc); 
      GREEN_LED = OFF;
    }
    else {
        cool(dc);
        GREEN_LED = ON;
    }
} 

}