can i know how to use the timer in begleboneblack On Monday, September 24, 2012 11:54:48 AM UTC+5:30, David wrote: > > > Hi all, > > I have tested the DMTimer in the BeagleBone in free mode and compare mode > (with direct access to the registers) and all was fine (counter was fine > and interrupt was generated in compare mode). > However, I have been trying to make the DMTimer work in capture mode and I > did not succeed at all. The dedicated input trigger seems not to work (no > interrupt is raised, and no values are loaded into the TCAR registers). I > have tried with TIMER4 (and TIMER7 later) pin in the BeagleBone. > > What I need is saving the current timer value into the TCAR registers when > a change/pulse in the timer dedicated input is detected. > > This is my configuration: > > Multiplex: > Configure dedicated pin as TIMER4 peripheral (Should not be required as > this is the default configuration of BeagleBone) > > Interrupts: (I suppose this should be fine, as interrupt triggers in > compare mode) > Set register INTC_ILR92 to 0 (max priority) > Set bit 92%32 on INTC_MIR3 to 1 to enable interrupt > > DMTimer module: > Disable timer: set TCLR to 0 > Re-load 0 in overflow: set TLDR to 0 > Clear initial count: set TCRR to 0 > Enable interrupt: set TIMER_IRQ_CAPTURE to IRQENABLE_SET --> value = (1<<2) > Enable timer: set TIMER_START | TIMER_AUTORELOAD | TIMER_CAPTURE_RISING to > TCLR --> value = 1 | (1<<1) | (1<<8) > Clear any pending associated interrupt. > > As a fallback solution I am now reading the free running timer value from > a GPIO interrupt handler that detects the change; however I would need the > most accurate timer value possible. > > Does anyone have an idea about what I am doing wrong? > > Thanks in advance.
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