Hi,
I hope that's how this works. Here is a patch for the raspberrypi clock driver
to use the correct value for the timer counter based on
rtems_configuration_get_microseconds_per_tick() as discussed in the user-list.
Cheers,
Jan
-------------------------------------------------------------
>From 57e7ce5554a64ee69c424f1bd55af2f89f9e4061 Mon Sep 17 00:00:00 2001
From: Jan Sommer <summers...@web.de>
Date: Tue, 7 Jul 2015 22:33:51 +0200
Subject: [PATCH] RaspberryPi: Use
rtems_configuration_get_microseconds_per_tick to set clock counter
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
---
c/src/lib/libbsp/arm/raspberrypi/clock/clockdrv.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/c/src/lib/libbsp/arm/raspberrypi/clock/clockdrv.c b/c/src/lib/libbsp/arm/raspberrypi/clock/clockdrv.c
index f765485..e239f5a 100644
--- a/c/src/lib/libbsp/arm/raspberrypi/clock/clockdrv.c
+++ b/c/src/lib/libbsp/arm/raspberrypi/clock/clockdrv.c
@@ -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;
--
2.1.4
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