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RaspberryPi: Use rtems_configuration_get_microseconds_per_tick to set clock counter

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timer interrupt was hard coded to 10 ms per tick.
    Fix uses the setting of CONFIGURE_MICROSECONDS_PER_TICK to compute the correct start value for the counter
    See for more information: http://permalink.gmane.org/gmane.os.rtems.user/22691
This commit is contained in:
Jan Sommer
2015-07-07 22:33:51 +02:00
committed by Joel Sherrill
parent 635ed82a12
commit e77f625401
1 changed files with 4 additions and 2 deletions
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6
c/src/lib/libbsp/arm/raspberrypi/clock/clockdrv.c
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@@ -50,8 +50,10 @@ static void raspberrypi_clock_handler_install(void)
static void raspberrypi_clock_initialize(void)
{
BCM2835_REG(BCM2835_TIMER_CTL) = 0x003E0000;
BCM2835_REG(BCM2835_TIMER_LOD) = 10000 - 1;
BCM2835_REG(BCM2835_TIMER_RLD) = 10000 - 1;
BCM2835_REG(BCM2835_TIMER_LOD) =
rtems_configuration_get_microseconds_per_tick() - 1;
BCM2835_REG(BCM2835_TIMER_RLD) =
rtems_configuration_get_microseconds_per_tick() - 1;
BCM2835_REG(BCM2835_TIMER_DIV) = BCM2835_TIMER_PRESCALE;
BCM2835_REG(BCM2835_TIMER_CLI) = 0;
BCM2835_REG(BCM2835_TIMER_CTL) = 0x003E00A2;