X-Git-Url: http://git.rot13.org/?p=goodfet;a=blobdiff_plain;f=firmware%2Fapps%2Fglitch%2Fglitch.c;h=c2446d55c0b1bdc39ce595848433fde3c6abc193;hp=95653ff958042f2ff42589a9ab778b4d05b3bcdb;hb=5c029aa0c4f7573d9fa49beefe6e887dee2b25f9;hpb=f0eaf8347f79d77ca7d1bcaf8018d3e3b1505649

diff --git a/firmware/apps/glitch/glitch.c b/firmware/apps/glitch/glitch.c
index 95653ff..c2446d5 100644
--- a/firmware/apps/glitch/glitch.c
+++ b/firmware/apps/glitch/glitch.c
@@ -15,20 +15,11 @@
 //! Call this before the function to be glitched.
 void glitchprime(){
 #ifdef DAC12IR
-  //Don't forget to call glitchvoltages().
-  P5OUT|=0x80;
-  //Reconfigure TACTL.
-  TACTL=0;           //Clear dividers.
-  TACTL|=TACLR;      //Clear TimerA Config
-  TACTL|=
-    TASSEL_SMCLK |   //SMCLK source,
-    MC_1 |            //Count up to CCR0
-    TAIE;            //Enable Interrupt
-  CCTL0 = CCIE;                         // CCR0 interrupt enabled
-  CCR0 = glitchcount;
+  WDTCTL = WDTPW + WDTHOLD;             // Stop WDT
   
-  //Enable general interrupts, just in case.
-  //_EINT();
+  glitchsetup();
+  _EINT();
+  return;
 #endif
 }
 
@@ -36,35 +27,42 @@ void glitchprime(){
 void glitchsetup(){
 #ifdef DAC12IR
   //Set GSEL high to disable glitching.
-
-  P5DIR|=0x80;
-  P6DIR|=BIT6+BIT5;
   
-  P5OUT|=0x80;
+  //Normal voltage, use resistors instead of output.
+  //P5DIR=0x80;   //ONLY glitch pin is output.
+  P5DIR|=0x80;   //glitch pin is output.
+  P5OUT|=0x80;  //It MUST begin high.
+  //P5REN|=0x7F;  //Resistors pull high and low weakly.
+  
+  P6DIR|=BIT6+BIT5;
   P6OUT|=BIT6+BIT5;
-
+  
   WDTCTL = WDTPW + WDTHOLD;             // Stop WDT
   TACTL = TASSEL1 + TACLR;              // SMCLK, clear TAR
   CCTL0 = CCIE;                         // CCR0 interrupt enabled
-  CCR0 = glitchcount;
-  TACTL |= MC1;                         // Start Timer_A in continuous mode
-  //TACTL |= MC0;                         // Stop Timer_A;
-  _EINT();                              // Enable interrupts 
+  CCR0 = glitchcount+0x10;              // Compare Value
+  TACTL |= MC_2;                        // continuous mode.
 #endif
 }
 
 // Timer A0 interrupt service routine
-interrupt(TIMERA0_VECTOR) Timer_A (void)
-{
-  P5OUT&=~BIT7;//Glitch
-  P5OUT|=BIT7;//Normal
-  TACTL |= MC0;                         // Stop Timer_A;
+interrupt(TIMERA0_VECTOR) Timer_A (void){
+  //This oughtn't be necessary, but glitches repeat without it.
+  TACTL=0; //disable counter.
+  
+  
+  P5OUT^=BIT7;//Glitch
+  //asm("nop"); //delay deepens glitch.
+  P5OUT^=BIT7;//Normal
+  
+  //This oughtn't be necessary, but glitches repeat without it.
+  TACTL=0; //disable counter.
+  
+  //P5OUT^=BIT7;//Normal
   return;
 }
 
 
-
-
 u16 glitchcount=0;
 
 //! Glitch an application.
@@ -75,10 +73,19 @@ void glitchapp(u8 app){
 
 //! Set glitching voltages.
 void glitchvoltages(u16 gnd, u16 vcc){
-  int i;
-  //debugstr("Set glitching voltages.");
+  
+  //debugstr("Set glitching voltages: GND and VCC");
+  //debughex(gnd);
+  //debughex(vcc);
+  
+  /** N.B., because this is confusing as hell.  As per Page 86 of
+      SLAS541F, P6SEL is not what controls the use of the DAC0/DAC1
+      functions on P6.6 and P6.5.  Instead, CAPD or DAC12AMP>0 sets
+      the state.
+  */
   
   #ifdef DAC12IR
+  int i;
   ADC12CTL0 = REF2_5V + REFON;                  // Internal 2.5V ref on
   // Delay here for reference to settle.
   for(i=0;i!=0xFFFF;i++) asm("nop");
@@ -111,30 +118,35 @@ void glitchhandle(unsigned char app,
   case GLITCHVERB:
     //FIXME parameters don't work yet.
     glitchprime();
+    TAR=0; //Reset clock.
     handle(cmddata[0],cmddata[1],0);
+    TACTL |= MC0;// Stop Timer_A;
     break;
   case GLITCHTIME:
     _DINT();//disable interrupts
     TACTL=0; //clear dividers
     TACTL|=TACLR; //clear config
     TACTL|=TASSEL_SMCLK| //smclk source
-      MC_2; //continuout mode.
+      MC_2; //continuous mode.
     
     //perform the function
     silent++;//Don't want the function to return anything.
+    TAR=0;
     handle(cmddata[0],cmddata[1],0);
-    silent--;
     cmddataword[0]=TAR; //Return counter.
+    silent--;
     txdata(app,verb,2);
     break;
   case START:
-    glitchvoltages(0xFFF,0);//Inverted VCC and GND.
+    //Testing mode, for looking at the glitch waveform.
+    glitchvoltages(0,0xFFF);//Minimum glitch, for noise test.
+    //glitchvoltages(0,0);//Drop VCC
+    //glitchvoltages(0xFFF,0xFFF);//Raise Ground
     P5OUT|=BIT7;//Normal
     P5DIR|=BIT7;
     while(1){
       P5OUT&=~BIT7;//Glitch
-      //asm("nop");//asm("nop");asm("nop");asm("nop");asm("nop");asm("nop");
-      asm("nop"); //Not necessary.
+      //asm("nop"); //Not Necessary
       P5OUT|=BIT7;//Normal
       asm("nop");asm("nop");asm("nop");asm("nop");asm("nop");asm("nop");
       asm("nop");asm("nop");asm("nop");asm("nop");asm("nop");asm("nop");