I'm using a BF534 with VisualDSP 5.0 update 7.
In the System Services Library adi_ports_bf534.c there's a routine called ad_ports_EnableTimer()
and it gets called down the chain from my call to adi_tmr_GPGroupEnable().
I have set up three timers as part of initialising the PPI for an LCD display. I found my hardware
would reset when this routine was called.
It seems that although I was setting up the timers to run from PPI_CLK as an input, the routine
was setting PPI_CLK as an output and causing a current drain to dip the 3.3v and trip the MAX809
Can anyone re-assure me that the following code is wrong: (in ad_ports_EnableTimer, line 589)
// CASE ( TMR_CLK pin)
// Set mask for TMRCLK pin
port_masks[ADI_PORTS_GET_PORT(ADI_PORTS_TIMER_TMR_CLK)] |= ADI_PORTS_GET_PIN_MASK(ADI_PORTS_TIMER_TMR_CLK);
// Set bits in PORTFIO_DIR and PORTFIO_INEN registers to enable TMRCLK pin for input
// (I need to check whether this is necessary)
*pPORTFIO_DIR |= ADI_PORTS_GET_PIN_MASK(ADI_PORTS_TIMER_TMR_CLK);
*pPORTFIO_INEN |= ADI_PORTS_GET_PIN_MASK(ADI_PORTS_TIMER_TMR_CLK);
I've changed line 589 to :
*pPORTFIO_DIR &= ~(ADI_PORTS_GET_PIN_MASK(ADI_PORTS_TIMER_TMR_CLK));
Since the comments suggest that it is trying to make the port pin an input.