X-Git-Url: http://git.rot13.org/?p=goodfet;a=blobdiff_plain;f=firmware%2Fapps%2Fglitch%2Fglitch.c;h=0691932f3ba173276bbc8a7fc30ba4635addf2b4;hp=224244876bb931991ddd448eac8e23c417b86b0c;hb=704a3e5036b88ba2fc03606d24b0e474b22338e8;hpb=bd6ced95abc5725c991fc100d94a023b27c9e159

diff --git a/firmware/apps/glitch/glitch.c b/firmware/apps/glitch/glitch.c
index 2242448..0691932 100644
--- a/firmware/apps/glitch/glitch.c
+++ b/firmware/apps/glitch/glitch.c
@@ -15,21 +15,11 @@
 //! Call this before the function to be glitched.
 void glitchprime(){
 #ifdef DAC12IR
-  //Set to high voltage.
-  DAC12_0DAT = glitchH;
-  
-  //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.
+  glitchsetup();
   _EINT();
+  return;
 #endif
 }
 
@@ -37,68 +27,43 @@ void glitchprime(){
 void glitchsetup(){
 #ifdef DAC12IR
   //Set GSEL high to disable glitching.
-
-  P5DIR|=0x80;
-  P6DIR|=0x40;  
   
-  P5OUT|=0x80;
-  P6OUT|=0x40;
+  //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;
   
-  glitchsetupdac();
-
   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
-  _EINT();                              // Enable interrupts 
+  CCR0 = glitchcount+0x10;              // Compare Value
+  TACTL |= MC_2;                        // continuous mode.
 #endif
 }
 
-//! Setup analog chain for glitching.
-void glitchsetupdac(){
-  glitchvoltages(glitchL,glitchH);
-}
-
 // Timer A0 interrupt service routine
-interrupt(TIMERA0_VECTOR) Timer_A (void)
-{
-#ifdef DAC12IR
-  //debugstr("Glitching.");
-  DAC12_0DAT = glitchL;
-  asm("nop");
-  asm("nop");
-  asm("nop");
-  asm("nop");
-  asm("nop");
-  DAC12_0DAT = glitchH;
-  //DAC12_0DAT = glitchL;
-  /*
-  switch(glitchstate){
-  case 0:
-    P1OUT|=1;
-    glitchstate=1;
-    DAC12_0DAT = glitchH;
-    break;
-  case 1:
-    P1OUT|=1;
-    glitchstate=0;
-    DAC12_0DAT = glitchL;
-    break;
-  default:
-    P1OUT&=~1;
-    //Do nothing.
-    break;
-  }
-  */
-#endif
+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 glitchH=0xfff, glitchL=0xfff,
-  glitchstate=2, glitchcount=0;
+u16 glitchcount=0;
 
 //! Glitch an application.
 void glitchapp(u8 app){
@@ -107,21 +72,28 @@ void glitchapp(u8 app){
 
 
 //! Set glitching voltages.
-void glitchvoltages(u16 low, u16 high){
-  int i;
-  glitchH=high;
-  glitchL=low;
+void glitchvoltages(u16 gnd, u16 vcc){
   
-  //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");
   DAC12_0CTL = DAC12IR + DAC12AMP_5 + DAC12ENC; // Int ref gain 1
+  DAC12_1CTL = DAC12IR + DAC12AMP_5 + DAC12ENC; // Int ref gain 1
   // 1.0V 0x0666, 2.5V 0x0FFF
-  DAC12_0DAT = high;
-  //DAC12_0DAT = 0x0880;
+  DAC12_0DAT = vcc; //high;
+  DAC12_1DAT = gnd; //low;
   #endif 
 }
 //! Set glitching rate.
@@ -146,23 +118,44 @@ 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:
+    debugstr("Measuring start time.");
     _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--;
+    debugstr("Measured start time.");
+    debughex(cmddataword[0]);
     txdata(app,verb,2);
     break;
   case START:
+    //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"); //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");
+    }
+    txdata(app,verb,0);
+    break;
   case STOP:
   case GLITCHAPP:
   default: