diff options
author | Chris Johns <chrisj@rtems.org> | 2017-12-23 18:18:56 +1100 |
---|---|---|
committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2018-01-25 08:45:26 +0100 |
commit | 2afb22b7e1ebcbe40373ff7e0efae7d207c655a9 (patch) | |
tree | 44759efe9374f13200a97e96d91bd9a2b7e5ce2a /bsps/arm/lpc24xx/include/bsp/system-clocks.h | |
parent | MAINTAINERS: Add myself to Write After Approval. (diff) | |
download | rtems-2afb22b7e1ebcbe40373ff7e0efae7d207c655a9.tar.bz2 |
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.
Diffstat (limited to 'bsps/arm/lpc24xx/include/bsp/system-clocks.h')
-rw-r--r-- | bsps/arm/lpc24xx/include/bsp/system-clocks.h | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/bsps/arm/lpc24xx/include/bsp/system-clocks.h b/bsps/arm/lpc24xx/include/bsp/system-clocks.h new file mode 100644 index 0000000000..564d12ec10 --- /dev/null +++ b/bsps/arm/lpc24xx/include/bsp/system-clocks.h @@ -0,0 +1,89 @@ +/** + * @file + * + * @ingroup lpc24xx_clocks + * + * @brief System clocks. + */ + +/* + * Copyright (c) 2008, 2009 + * embedded brains GmbH + * Obere Lagerstr. 30 + * D-82178 Puchheim + * Germany + * <rtems@embedded-brains.de> + * + * The license and distribution terms for this file may be + * found in the file LICENSE in this distribution or at + * http://www.rtems.org/license/LICENSE. + */ + +#ifndef LIBBSP_ARM_LPC24XX_SYSTEM_CLOCKS_H +#define LIBBSP_ARM_LPC24XX_SYSTEM_CLOCKS_H + +#include <bsp/lpc24xx.h> + +#ifdef __cplusplus +extern "C" { +#endif /* __cplusplus */ + +/** + * @defgroup lpc24xx_clock System Clocks + * + * @ingroup lpc24xx + * + * @brief System clocks. + * + * @{ + */ + +/** + * @brief Initializes the standard timer. + * + * This function uses Timer 1. + */ +void lpc24xx_timer_initialize(void); + +/** + * @brief Returns current standard timer value in CPU clocks. + * + * This function uses Timer 1. + */ +static inline unsigned lpc24xx_timer(void) +{ + return T1TC; +} + +/** + * @brief Delay for @a us micro seconds. + * + * This function uses the standard timer and assumes that the CPU frequency is + * in whole MHz numbers. The delay value @a us will be converted to CPU ticks + * and there is no protection against integer overflows. + * + * This function uses Timer 1. + */ +void lpc24xx_micro_seconds_delay(unsigned us); + +/** + * @brief Returns the PLL output clock frequency in [Hz]. + * + * Returns zero in case of an unexpected PLL input frequency. + */ +unsigned lpc24xx_pllclk(void); + +/** + * @brief Returns the CPU clock frequency in [Hz]. + * + * Returns zero in case of an unexpected PLL input frequency. + */ +unsigned lpc24xx_cclk(void); + +/** @} */ + +#ifdef __cplusplus +} +#endif /* __cplusplus */ + +#endif /* LIBBSP_ARM_LPC24XX_SYSTEM_CLOCKS_H */ |