systick.h

00001 /* Copyright (C) 2011 by Ivo van Poorten <ivop@euronet.nl>
00002  * This file is licensed under the terms of the GNU Lesser
00003  * General Public License, version 3.
00004  */
00005 
00006 #ifndef FASTLIB_SYSTICK_H
00007 #define FASTLIB_SYSTICK_H
00008 
00009 #include "fastlib/common.h"
00010 
00011 #define FL_STCTRL       ((volatile uint32_t *) 0xE000E010)
00012 #define FL_STRELOAD     ((volatile uint32_t *) 0xE000E014)
00013 #define FL_STCURR       ((volatile uint32_t *) 0xE000E018)
00014 #define FL_STCALIB      ((volatile uint32_t *) 0xE000E01C)
00015 
00016 static inline void fl_systick_control(const unsigned enable,
00017                                       const unsigned interrupt_enable,
00018                                       const unsigned use_cpu_clock) {
00019     *FL_STCTRL = enable | (interrupt_enable<<1) | (use_cpu_clock<<2);
00020 }
00021 
00022 static inline unsigned fl_systick_get_counter_flag(void) {
00023     return *FL_STCTRL & (1U<<16);
00024 }
00025 
00026 static inline void fl_systick_set_reload_value(const unsigned value) {
00027     *FL_STRELOAD = value;
00028 }
00029 
00030 static inline unsigned fl_systick_get_reload_value(void) {
00031     return *FL_STRELOAD;
00032 }
00033 
00034 static inline unsigned fl_systick_get_current_value(void) {
00035     return *FL_STCURR;
00036 }
00037 
00038 static inline void fl_systick_set_calibration(const unsigned reload_value,
00039                                               const unsigned has_skew,
00040                                               const unsigned no_ext_ref_clock) {
00041     *FL_STCALIB = reload_value | (has_skew<<30) | (no_ext_ref_clock<<31);
00042 }
00043 
00044 static inline unsigned fl_systick_get_calibration_reload_value(void) {
00045     return *FL_STCALIB & ((1U<<24)-1);
00046 }
00047 
00048 static inline unsigned fl_systick_get_calibration_skew(void) {
00049     return *FL_STCALIB & (1U<<30);
00050 }
00051 
00052 static inline unsigned fl_systick_get_calibration_noref(void) {
00053     return *FL_STCALIB & (1U<<31);
00054 }
00055 
00056 #endif