+performance tests; some modifications to the Cast5-test-suit

[avr-crypto-lib.git] / performance_test.c

diff --git a/performance_test.c b/performance_test.c
new file mode 100644 (file)
index 0000000..91d4f1c
--- /dev/null
+++ b/performance_test.c
@@ -0,0 +1,60 @@
+/*
+ * 
+ * 
+ * 
+ */
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include "performance_test.h"
+
+uint32_t ovfcounter;
+
+uint16_t const_overhead=0;
+uint16_t int_overhead=0;
+
+ISR(TIMER1_OVF_vect){
+       ovfcounter++;
+}
+
+void calibrateTimer(void){
+       startTimer(1);
+       stopTimer();
+       const_overhead = TCNT1;
+       startTimer(1);
+       TCNT1=0xFFFE;
+       ; ; ; ;
+//     asm volatile("NOP\n"::); asm volatile("NOP\n"::);
+       stopTimer();
+       int_overhead = TCNT1;
+}
+
+void startTimer(uint8_t granularity){
+       TCCR1B = 0; /* stop timer */
+       TCNT1  = 0;
+       ovfcounter = 0;
+       TCCR1A = 0x00;
+       TIMSK &= 0xC3;
+       TIMSK |= _BV(2); /* enable TOIE1 */
+       TCCR1B = granularity & 0x7;     /* start timer */
+}
+
+uint64_t stopTimer(void){
+       TCCR1B = 0; /* stop timer */
+       uint64_t ret;
+       ret = (ovfcounter<<16) | TCNT1;
+       ret -= const_overhead;
+       ret -= ovfcounter * int_overhead;
+       return ret;
+}
+
+void getOverhead(uint16_t* constoh, uint16_t* intoh){
+       *constoh = const_overhead;
+       *intoh   = int_overhead; 
+}
+
+
+
+