source: rtems/c/src/lib/libbsp/arm/atsam/clock/systick-freq.c @ f2e0f8e

Last change on this file since f2e0f8e was f2e0f8e, checked in by Sebastian Huber <sebastian.huber@…>, on Jan 14, 2016 at 3:03:51 PM

bsp/atsam: New

Close #2529.

  • Property mode set to 100644
File size: 630 bytes
Line 
1/*
2 * Copyright (c) 2016 embedded brains GmbH.  All rights reserved.
3 *
4 *  embedded brains GmbH
5 *  Dornierstr. 4
6 *  82178 Puchheim
7 *  Germany
8 *  <rtems@embedded-brains.de>
9 *
10 * The license and distribution terms for this file may be
11 * found in the file LICENSE in this distribution or at
12 * http://www.rtems.org/license/LICENSE.
13 */
14
15#include <bsp.h>
16
17#include <chip.h>
18
19uint32_t atsam_systick_frequency(void)
20{
21  uint32_t mdiv = (PMC->PMC_MCKR & PMC_MCKR_MDIV_Msk) >> PMC_MCKR_MDIV_Pos;
22  uint32_t fclk;
23
24  if (mdiv == 3) {
25    fclk = BOARD_MCK * mdiv;
26  } else {
27    fclk = BOARD_MCK * (1 << mdiv);
28  }
29
30  return fclk;
31}
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