//! Call this before the function to be glitched.
void glitchprime(){
#ifdef DAC12IR
- //Don't forget to call glitchvoltages().
-
- //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
}
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
- _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)
-{
-#ifdef DAC12IR
- P5OUT&=~BIT7;//Glitch
- P5OUT|=BIT7;//Normal
-#endif
- 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 glitchH=0xfff, glitchL=0xfff,
- glitchstate=2, glitchcount=0;
+u16 glitchcount=0;
//! Glitch an application.
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");
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.
+ TACTL|=
+ TASSEL_SMCLK //smclk source
+ | 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:
- 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");