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3B2: Fix for diagnostics timer hang

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Under certain circumstances, the timer resolution in the Version 3
could become coarse enough that very short timer intervals would lead
to an infinite loop of bus errors when running timer firmware
diagnostics.
This commit is contained in:
Seth Morabito 2023-04-13 05:56:35 +02:00
parent 7be9f2f3e8
commit ae7ca950f2
1 changed files with 7 additions and 3 deletions
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10
3B2/3b2_timer.c
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@ -92,9 +92,13 @@
#define QUICK_DELAY 100 #define QUICK_DELAY 100
#endif #endif
#define DELAY_US(C,N) ((TIMER_MODE(C) == 3) ? \ #define MIN_US 100
(TIME_BASE[(N)] * (C)->divider) / 2 : \
TIME_BASE[(N)] * (C)->divider) #define CALC_US(C,N) ((TIMER_MODE(C) == 3) ? \
(TIME_BASE[(N)] * (C)->divider) / 2 : \
TIME_BASE[(N)] * (C)->divider)
#define DELAY_US(C,N) (MAX(MIN_US, CALC_US((C),(N))))
#if defined(REV3) #if defined(REV3)
/* Microseconds per step (Version 3 system board): /* Microseconds per step (Version 3 system board):