Comment #6 on issue 83 by jsuijs: delay.jal accuracy varies
http://code.google.com/p/jallib/issues/detail?id=83
And after some minor ajustments in 10us-loop:
CPU
setpoint 1MHz 4MHz 8MHz 20MHz
1 300.00% 0.00% 0.00% 0.00% 75.00%
2 100.00% 0.00% 0.00% 0.00% 25.00%
5 60.00% 0.00% 0.00% 0.00% 15.00%
9 33.33% 0.00% 0.00% 0.00% 8.33%
10 420.00% 30.00% 10.00% 2.00% 115.50%
20 500.00% 65.00% 12.50% 1.00% 144.63%
50 308.00% 26.00% 5.00% 0.80% 84.95%
100 244.00% 13.00% 2.50% 1.40% 65.23%
200 212.00% 6.50% 1.25% 1.70% 55.36%
500 192.80% 2.60% 0.50% 1.88% 49.45%
1000 186.40% 1.30% 0.25% 1.94% 47.47%
2000 183.20% 0.65% 0.13% 1.97% 46.49%
1000 8.80% 1.60% 1.20% 0.32% 2.98%
2000 2.40% 0.80% 0.40% 0.24% 0.96%
5000 1.12% 0.16% 0.08% 0.13% 0.37%
10000 0.16% 0.00% 0.00% 0.08% 0.06%
20000 0.32% 0.08% 0.06% 0.06% 0.13%
161.91% 8.69% 1.99% 0.80% 43.35%
These result show:
- perfect accuracy below 10us (thanks to the compiler)
- accuracy of delay_10us() is largly improved. Further improvement is only
possible
with larger, more complex code.
- accuracy of delay_1ms() is pretty good (but could be improved)
- use of delay_10us() with clock below 4 MHz is not recommended, since the
loop just
takes too long. Concider use of _usec_delay(n) if you need better accuracy.
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