==== Main.c (uses procyon avrlib) ====
<code c>
#include "main.h"

 

 

 

 

 

 

 

int get_char0(FILE* stream)

 

{

 

 int c=-1;

 

 while(c==-1)

 

 {c=uartGetByte();} //getchar gets the stream, loop until we get something

 

 return (u08) c;

 

}

 

 

 

 

 

int put_char0(char c, FILE *stream)

 

{

 

   loop_until_bit_is_set(UCSR0A, UDRE0);         //unbuffered tx comms

 

   UDR0 = c;

 

   return 0;

 

   /*

 

   if(uartReadyTx || !uartBufferedTx ) //if buffer is empty or we arent buffered

 

   {uartSendByte(c);                  //sends directly to uart

 

	return 0;

 

   }

 

   else

 

   {

 

    //while(!bufferAddToEnd(Txbuff0,c));    //send the character to buffer

 

    if(uartAddToTxBuffer(c))

 

    {return 0;}

 

    else

 

    {return -1;}

 

   }*/

 

}







int pseudoscanf()

{



char s[20];



int d;



fgets(s,20,stdin);  

  

sscanf(s,"%d",&d);



return d;



}





float getHVvalue(int n)

 

{

 if(n>0 && n<4)                                 //sanity check

 {

 	 if (n==1) n=0;                                //corrects mistake on the board

 

	  		return hvfactor*((float)a2dConvert10bit(n)-520.0);   //correct for unbalanced resistors on board

 

 }

 else

 {

 	 return -1;

 }

}

 

 

 

void overflow(void)

 

{

 

float delta=i_term*(p_setpoint-pressuredifference());     

 

if(position>-delta)                         //ie we're not going to end up with -ive position

 

	 position+=delta;

 

if (position>1400.0) position=1400.0;         //maximum limit on duty cycle

 

	timer1PWMASet((u16)position);

 

}

 

void temperatureprint()

{

	 int temp=a2dConvert10bit(temppin);

	 printf("%d,%.1f\r\n",temp,-16.436*log(1.11258*((1024.0/(double)temp)-1.0)));          //returns the thermistor temperature

 

} 

 

float pressuredifference()

 

{

 

	return (float)pressurefactor*((float)a2dConvert10bit(pressurepin)-pressurenull);

 

}

 



void set_control_loop(d)

{

if(d!=0)

   {

   if(!pump) timer1PWMAOn();                                      //if we set a target of zero, it turns off pwm completely, which is handy

   pump=TRUE;

   timerAttach(1,overflow);               //ISR on pwm falling edge

   p_setpoint=(float)d/1000.0;

   }

  else

   {

   pump=FALSE;

   timerDetach(1);               //ISR off pwm falling edge

   timer1PWMAOff();

   }

}



 

 

void HVenable(int n)

 

{

 



if (n<4 && n>-1)

 

 {

 

	  PORTD|=0b00011100;                               //turn it all off

 

	  if (n) PORTD&=~(1<<(n+1));                         //sending 0 will turn off all the HV supplies

 

	  printf("HV %d enabled\r\n",n);

 

 }

 

else printf("%d is not a HV channel\r\n",n); 

 

}

 

 

 

void nullset(void)

 

{

 

u08 n;

 

u32 s=0;

 

for(n=0;n<255;n++)

 

{

 

 	s+=a2dConvert10bit(pressurepin);

 

 	_delay_ms(7);

 

}

 

pressurenull=(float)s;

 

pressurenull/=256;

 

printf("%f = pressurenull\r\n",(double)pressurenull);

 

}

 

 

 

 

 

int main(void)

 

{

 

//int nodata=0;

 

int d;



signed char c;

 



DDRD=0b00011100;       //hv outputs

 

PORTD=0b00011100;      //set the outputs high ie all HV supplies off

 

DDRB=0b00000010;       //pump pwm

 

PORTB=0x00;

 

uartInit(); 

 

uartSetBaudRate(19200);

 

FILE mystdio0 = FDEV_SETUP_STREAM(put_char0, get_char0, _FDEV_SETUP_RW);  //so we can printf to the radio

 

stdout = &mystdio0; //set our stdio out function

 

stdin = &mystdio0; // 

 

sei();

 

//while(1)

 

//{

 

//printf("hello\r\n");

 

//_delay_ms(20);

 

//}

 

timerInit();

 

timer1SetPrescaler(TIMER_CLK_DIV1);

 

timer1PWMInitICR(4095);

 

//timer1PWMAOn();

 

timer1PWMASet(0);

 

a2dInit();

 

puts("setup ok\r\n");

 

nullset();

 

while(1)

 

{

 

 c=uartGetByte();

 //scanf("%c",&c);;

 

 //if(c!=-1)

 

 //{

 

  //printf("%c\r\n",c);

 

  switch(c)

 

  {

 

  case 'V':                                                          //HV voltage feedback

 

  printf("%.0f\r\n",(double)getHVvalue(pseudoscanf()));                          //we only need it to the nearest volt

 

  break;

 

  case 'D':

 

  printf("%d,%.4f\r\n",a2dConvert10bit(pressurepin),(double)pressuredifference());     //Pressure feedback

 

  break;

 

  case 'H':



  d=pseudoscanf();



  printf("got %d",d);

 

  HVenable(d);                                                               //turn on a HV supply

 

  break;

 

  case 'P':

 

  d=pseudoscanf();

                                             //set a differential target - note in units of % of full range

  set_control_loop(d);  



  break;

 

  case 'C':

 

  d=pseudoscanf();

 

  i_term=(float)d/16.0;                                                     //set a correction factor (might need a dive term if things are messed with)

 

  break;



  case 'K':

  

  d=(int)(p_setpoint*1000.0);													//store the setpoint

  set_control_loop(0);														//turn off pump

  for(c=0;c<100;c++) _delay_ms(10);											//wait 1 second

  nullset();

  set_control_loop(d);

  break;



  case 'T':

  temperatureprint(); 

  break;

 

  case 'I':

 

  printf("%.3f\r\n",ionfactor*((double)a2dConvert10bit(ionpin)-520.0));      //returns the ionisation current - opamp is using the split ie 2.5V rail

 

  break;                                                                   //hence the 512

 

  //default:

  //if (c!=-1) printf("command not found\r\n");

  //nodata=0;

 

  }

 

 //}

 

 /*else

 

 {

 

  nodata++;

 

  for(d=0;d<50;d++)

 

  { _delay_ms(10);}

 

  //printf("%d,%f\r\n",nodata,(double)pressuredifference());

 

 }*/

 

}

 

return 0;

 

}

 

</code>