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karplus / PteroDAQ

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Change all ARMs to 2-PIT timer #35

Closed karplus closed 9 years ago

karplus commented 9 years ago

Original report by kevin_karplus (Bitbucket: kevin_karplus, ).

Change all ARM implementations to use PIT 0 and PIT 1 for both timestamps and periodic interrupts.

karplus commented 9 years ago

Original comment by kevin_karplus (Bitbucket: kevin_karplus, ).

Done. Prescale (loading PIT0) is still limited to a byte, but this provides 2^40 bus cycles per interrupt which is over 8.48 hours, even on Teensy 3.1

Changing communication protocol to allow multiple bytes could extend to 2^64 bus cycles.