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PDP10: Fix 2% wallclock issue for 50 Hz systems (R. Voorhorst)

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This commit is contained in:
Mark Pizzolato 2016-11-21 20:04:35 -08:00
parent 45a5432330
commit e740e13c13
1 changed files with 2 additions and 1 deletions
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3
PDP10/pdp10_tim.c
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@ -25,6 +25,7 @@
tim timer subsystem
10-Nov-16 R.V Fix wallclock issue for 50 Hz systems (R. Voorhorst)
18-Apr-12 RMS Removed absolute scheduling on reset
18-Jun-07 RMS Added UNIT_IDLE flag
03-Nov-06 RMS Rewritten to support idling
@ -292,7 +293,7 @@ tim_new_period = new_interval & ~TIM_HWRE_MASK;
if (new_interval & TIM_HWRE_MASK) tim_new_period += 010000;
/* clk_tps is the new number of clocks ticks per second */
clk_tps = (int32) ceil((double)TIM_HW_FREQ /(double)tim_new_period);
clk_tps = (int32) ceil(((double)TIM_HW_FREQ /(double)tim_new_period) - 0.5);
/* tmxr is polled every tim_mult clks. Compute the divisor matching the target. */
tim_mult = (clk_tps <= TIM_TMXR_FREQ) ? 1 : (clk_tps / TIM_TMXR_FREQ) ;