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--- projects:daughterboard_code [2008/02/18 04:31] – created laurenceb
+++ projects:daughterboard_code [2008/07/19 23:33] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
-==== Main.c (uses procyin avrlib) ====
+==== 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;
 }
@@ Line 25: / Line 45: @@
 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)
 {
-return hvfactor*((float)a2dConvert10bit(n)-512.0);
+ 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)
 {
-position+=i_term*(p_setpoint-pressuredifference());
-if (position>40000) position=40000;
-timer1PWMASet((u16)position);
+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);
+	return (float)pressurefactor*((float)a2dConvert10bit(pressurepin)-pressurenull);
 }
-void HVenable(void)
+void set_control_loop(d)
 {
-int n;
+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)
+{
-scanf("%d",&n);
 if (n<4 && n>-1)
  {
-  PORTD|=0b00011100;
-  if (n) PORTD&=~1<<(n++);                         //sending 0 will turn off all the HV supplies
+	  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(20);
+ 	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 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(65535);
-timer1PWMAOn();
+timer1PWMInitICR(4095);
-timer1PWMASet(10000);
-timerAttach(1,overflow);
+//timer1PWMAOn();
+timer1PWMASet(0);
 a2dInit();
 puts("setup ok\r\n");
 nullset();
 while(1)
 {
- scanf("%c",&c);;
+ c=uartGetByte();
+ //scanf("%c",&c);;
  //if(c!=-1)
  //{
   //printf("%c\r\n",c);
   switch(c)
   {
   case 'V':                                                          //HV voltage feedback
-  scanf("%d",&d);
-  printf("%f\r\n",getHVvalue(d));
+  printf("%.0f\r\n",(double)getHVvalue(pseudoscanf()));                          //we only need it to the nearest volt
   break;
   case 'D':
-  printf("%d,%f\r\n",a2dConvert10bit(pressurepin),(double)pressuredifference());     //Pressure feedback
+  printf("%d,%.4f\r\n",a2dConvert10bit(pressurepin),(double)pressuredifference());     //Pressure feedback
   break;
   case 'H':
-  HVenable();                                                               //turn on a HV supply
-  break;
-  case 'P':
+  d=pseudoscanf();
-  scanf("%f",&p_setpoint);                                                 //set a differential target
-  break;
-  case 'T':
+  printf("got %d",d);
-  scanf("%f",&i_term);                                                     //set a correction factor
-  break;
+  HVenable(d);                                                               //turn on a HV supply
-  case 'B':
-  printf("%f\r\n",batteryfactor*(double)a2dConvert10bit(batpin));          //returns the battery voltage
   break;
-  case 'I':
-  printf("%f\r\n",ionfactor*((double)a2dConvert10bit(ionpin)-512.0));      //returns the ionisation current - opamp is using the split ie 2.5V rail
+  case 'P':
-  break;                                                                   //hence the 512
-  default:
+  d=pseudoscanf();
-  printf("command not found\r\n");
+                                             //set a differential target - note in units of % of full range
-  nodata=0;
+  set_control_loop(d);
-  }
- //}
- /*else
+  break;
- {
-  nodata++;
+  case 'C':
-  for(d=0;d<50;d++)
-  { _delay_ms(10);}
+  d=pseudoscanf();
-  //printf("%d,%f\r\n",nodata,(double)pressuredifference());
- }*/
+  i_term=(float)d/16.0;                                                     //set a correction factor (might need a dive term if things are messed with)
-}
-return 0;
+  break;
-}
-</code>
-==== Main.h ====
+  case 'K':
-<code c>
-#include <avr/interrupt.h>
+  d=(int)(p_setpoint*1000.0);													//store the setpoint
-#include <stdio.h>
+  set_control_loop(0);														//turn off pump
-#include <avr/io.h>
+  for(c=0;c<100;c++) _delay_ms(10);											//wait 1 second
-#include <stdlib.h>
+  nullset();
-#include <util/delay.h>
+  set_control_loop(d);
-#include <avr/pgmspace.h>
+  break;
-#include "global.h"
+  case 'T':
-#include "uart.h"
+  temperatureprint();
-#include "buffer.h"
+  break;
-#include "a2d.h"
-#include "avrlibtypes.h"
+  case 'I':
-#include "avrlibdefs.h"
-#include "timerx8.h"
+  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:
-#define pressurepin 5
+  //if (c!=-1) printf("command not found\r\n");
-#define ionpin 4
+  //nodata=0;
-#define batpin 3
+  }
-#define hvfactor 48.8                          //v
+ //}
-#define pressurefactor 5.0/1024.0                //needs to be converted to psi
-#define batteryfactor 10.0/1024.0                //V volts (adjust the pot on the daughterboard)
+ /*else
-#define ionfactor 5.0/1024.0                     //u Amps
-#define defaultiterm 50
+ {
+  nodata++;
-int get_char0(FILE* stream);
-int put_char0(char c,FILE* stream);
+  for(d=0;d<50;d++)
-void nullset(void);
-void HVenable(void);
+  { _delay_ms(10);}
-float getHVvalue(int n);
-float pressuredifference();
+  //printf("%d,%f\r\n",nodata,(double)pressuredifference());
+ }*/
-volatile float pressurenull;
-volatile float p_setpoint;
+}
-volatile float position;
-volatile float i_term=defaultiterm;
+return 0;
+}
 </code>