Guru
Joined: 11/02/2018
Location: AustraliaPosts: 1911
| Posted: 02:15am 06 Dec 2022 |
At 378MHz about 1MHZ seems to be the limit.
> setpin 9,fin : setpin 4,pwm : dim integer n=900000
> do :pwm 1,n,50 : pause 11000:? n,pin(9) :inc n,10000 : loop
900000 894901
910000 905725
920000 915993
930000 925087
940000 934304
950000 946149
960000 955839
970000 965730
980000 975826
990000 986130
1000000 994005
1010000 1.004649e+06
1020000 1.015489e+06
1030000 1.025798e+06
1040000 1.034334e+06
1050000 1.043009e+06
1060000 1.054803e+06
1070000 1.063828e+06
1080000 1.074e+06
1090000 1.0854e+06
1100000 1.094971e+06
1110000 1.10378e+06
1120000 1.092688e+06
1130000 1.082784e+06
1140000 1.071426e+06
1150000 1.062888e+06
1160000 1.058435e+06
1170000 1.046447e+06
1180000 1.042621e+06
1190000 1.03643e+06
1200000 1.041723e+06
1210000 1.030806e+06
1220000 1.013033e+06
1230000 1.019278e+06
1240000 1.024406e+06
1250000 995328
1260000 1.001987e+06
1270000 1.01175e+06
1280000 1.017865e+06
1290000 1.024198e+06
1300000 1.033941e+06
>
Let it go much higher and it locks up.
with this one
> setpin 4,pwm :setpin 9,fin :dim integer n=900000, m
> do:pwm 1,n,50:pause 99:m=pin(9):pause 1100:?n,m :inc n,10000:loop
managed to stop it before it locked up, it was printing less than one character per second.
It took about a minute to do this:-
> memory
Program:
2K ( 1%) Program (64 lines)
118K (99%) Free
RAM:
1K ( 1%) 2 Variables
0K ( 0%) General
151K (99%) Free
>
Until the power is cycled it stays that way.
Edit
Setpin 9,off
Can restore normality.
PicoMite MMBasic Version 5.07.05RC10
Copyright 2011-2022 Geoff Graham
Copyright 2016-2022 Peter Mather
> ? mm.info(cpuspeed)
126000000
> setpin 4,pwm :setpin 9,fin :dim integer n=300000, m
> do:pwm 1,n,50:pause 99:m=pin(9):pause 1100:?n,m :inc n,10000:loop
300000 0
310000 192765
320000 299175
330000 314853
340000 324725
350000 332562
360000 339458
370000 353016
380000 363289
390000 355038
400000 348000
410000 343708
420000 335452
430000 330396
440000 334806
450000 330926
460000 331820
470000 339536
480000 344049
>.
Edited 2022-12-06 16:42 by phil99