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fix: 32bit tick timer based on TC0 and TC1

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TC1 counts the number of TC0 overflows (carry bits).
In random conditions TC1 would return or stay at zero,
instead of counting up. This due to the behavior of the
reset signal.

SAM7S Series Datasheet, 33.5.6 Trigger:
Regardless of the trigger used, it will be taken into account
at the following active edge of the selected clock. This means
that the counter value can be read differently from zero just
after a trigger, especially when a low frequency signal is
selected as the clock.

The new code first prepares TC1 and asserts TC1 trigger and
then prepares TC0 and asserts TC0 trigger. The TC0 start-up
will reset TC1.
This commit is contained in:
Andreas Dröscher 2018-08-11 21:53:29 +02:00
commit 9d330dde87
2 changed files with 53 additions and 44 deletions
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16
armsrc/ticks.h
View file

@ -19,7 +19,7 @@
#include "proxmark3.h"
#ifndef GET_TICKS
# define GET_TICKS (uint32_t)((AT91C_BASE_TC1->TC_CV << 16) | AT91C_BASE_TC0->TC_CV)
#define GET_TICKS GetTicks()
#endif
void SpinDelay(int ms);
@ -32,17 +32,15 @@ void StartCountUS(void);
uint32_t RAMFUNC GetCountUS(void);
void ResetUSClock(void);
void SpinDelayCountUs(uint32_t us);
//uint32_t RAMFUNC GetDeltaCountUS(void);
void StartCountSspClk();
void ResetSspClk(void);
uint32_t RAMFUNC GetCountSspClk();
extern void StartTicks(void);
extern void WaitTicks(uint32_t ticks);
extern void WaitUS(uint16_t us);
extern void WaitMS(uint16_t ms);
extern void ResetTicks();
extern void ResetTimer(AT91PS_TC timer);
extern void StopTicks(void);
void StartTicks(void);
uint32_t GetTicks(void);
void WaitTicks(uint32_t ticks);
void WaitUS(uint16_t us);
void WaitMS(uint16_t ms);
void StopTicks(void);
#endif