source: rtems/bsps/arm/lpc24xx/include/bsp/system-clocks.h @ 2afb22b

5
Last change on this file since 2afb22b was 2afb22b, checked in by Chris Johns <chrisj@…>, on 12/23/17 at 07:18:56

Remove make preinstall

A speciality of the RTEMS build system was the make preinstall step. It
copied header files from arbitrary locations into the build tree. The
header files were included via the -Bsome/build/tree/path GCC command
line option.

This has at least seven problems:

  • The make preinstall step itself needs time and disk space.
  • Errors in header files show up in the build tree copy. This makes it hard for editors to open the right file to fix the error.
  • There is no clear relationship between source and build tree header files. This makes an audit of the build process difficult.
  • The visibility of all header files in the build tree makes it difficult to enforce API barriers. For example it is discouraged to use BSP-specifics in the cpukit.
  • An introduction of a new build system is difficult.
  • Include paths specified by the -B option are system headers. This may suppress warnings.
  • The parallel build had sporadic failures on some hosts.

This patch removes the make preinstall step. All installed header
files are moved to dedicated include directories in the source tree.
Let @RTEMS_CPU@ be the target architecture, e.g. arm, powerpc, sparc,
etc. Let @RTEMS_BSP_FAMILIY@ be a BSP family base directory, e.g.
erc32, imx, qoriq, etc.

The new cpukit include directories are:

  • cpukit/include
  • cpukit/score/cpu/@RTEMS_CPU@/include
  • cpukit/libnetworking

The new BSP include directories are:

  • bsps/include
  • bsps/@RTEMS_CPU@/include
  • bsps/@RTEMS_CPU@/@RTEMS_BSP_FAMILIY@/include

There are build tree include directories for generated files.

The include directory order favours the most general header file, e.g.
it is not possible to override general header files via the include path
order.

The "bootstrap -p" option was removed. The new "bootstrap -H" option
should be used to regenerate the "headers.am" files.

Update #3254.
  • Property mode set to 100644
File size: 1.7 KB
Line 
1/**
2 * @file
3 *
4 * @ingroup lpc24xx_clocks
5 *
6 * @brief System clocks.
7 */
8
9/*
10 * Copyright (c) 2008, 2009
11 * embedded brains GmbH
12 * Obere Lagerstr. 30
13 * D-82178 Puchheim
14 * Germany
15 * <rtems@embedded-brains.de>
16 *
17 * The license and distribution terms for this file may be
18 * found in the file LICENSE in this distribution or at
19 * http://www.rtems.org/license/LICENSE.
20 */
21
22#ifndef LIBBSP_ARM_LPC24XX_SYSTEM_CLOCKS_H
23#define LIBBSP_ARM_LPC24XX_SYSTEM_CLOCKS_H
24
25#include <bsp/lpc24xx.h>
26
27#ifdef __cplusplus
28extern "C" {
29#endif /* __cplusplus */
30
31/**
32 * @defgroup lpc24xx_clock System Clocks
33 *
34 * @ingroup lpc24xx
35 *
36 * @brief System clocks.
37 *
38 * @{
39 */
40
41/**
42 * @brief Initializes the standard timer.
43 *
44 * This function uses Timer 1.
45 */
46void lpc24xx_timer_initialize(void);
47
48/**
49 * @brief Returns current standard timer value in CPU clocks.
50 *
51 * This function uses Timer 1.
52 */
53static inline unsigned lpc24xx_timer(void)
54{
55  return T1TC;
56}
57
58/**
59 * @brief Delay for @a us micro seconds.
60 *
61 * This function uses the standard timer and assumes that the CPU frequency is
62 * in whole MHz numbers.  The delay value @a us will be converted to CPU ticks
63 * and there is no protection against integer overflows.
64 *
65 * This function uses Timer 1.
66 */
67void lpc24xx_micro_seconds_delay(unsigned us);
68
69/**
70 * @brief Returns the PLL output clock frequency in [Hz].
71 *
72 * Returns zero in case of an unexpected PLL input frequency.
73 */
74unsigned lpc24xx_pllclk(void);
75
76/**
77 * @brief Returns the CPU clock frequency in [Hz].
78 *
79 * Returns zero in case of an unexpected PLL input frequency.
80 */
81unsigned lpc24xx_cclk(void);
82
83/** @} */
84
85#ifdef __cplusplus
86}
87#endif /* __cplusplus */
88
89#endif /* LIBBSP_ARM_LPC24XX_SYSTEM_CLOCKS_H */
Note: See TracBrowser for help on using the repository browser.