Frequency Measurement
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matherp Guru ![]() Joined: 11/12/2012 Location: United KingdomPosts: 10245 |
The latest version of the Armmite code includes support for a high speed frequency counter. Using SETPIN 93,FIN or SETPIN 93,CIN, pin 93 (PG8) is configured to clock a timer as suggested in the posts above. The timer then generates an interrupt on timer-overflow (16-bits) allowing total counts up to 2^63 before counter overflow (normal Micromite integer). I've tested the functionality up to 20MHz which is the fastest the PWM on the Armmite will run and it seems to work perfectly. ![]() The concept could be engineered into the firmware of the MM+ and/or MMX but the PIC has far fewer timers than the STM32 so it may compromise other functionality. There is no chance of doing it on the MM2 |
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