marcus chiou / mbed-src

mbed library sources

Fork of mbed-src by mbed official

targets/hal/TARGET_Atmel/common2/services/delay/sam0/systick_counter.h@592:a274ee790e56, 2015-07-17 (annotated)

Committer:
mbed_official
Date:
Fri Jul 17 09:15:10 2015 +0100
Revision:
592:a274ee790e56
Parent:
579:53297373a894 
Synchronized with git revision e7144f83a8d75df80c4877936b6ffe552b0be9e6



Full URL: https://github.com/mbedmicro/mbed/commit/e7144f83a8d75df80c4877936b6ffe552b0be9e6/



More API implementation for SAMR21

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 579:53297373a894 1 #ifndef CYCLE_COUNTER_H_INCLUDED
mbed_official 579:53297373a894 2 #define CYCLE_COUNTER_H_INCLUDED
mbed_official 579:53297373a894 3
mbed_official 579:53297373a894 4 #include <compiler.h>
mbed_official 579:53297373a894 5 #include <clock.h>
mbed_official 579:53297373a894 6
mbed_official 579:53297373a894 7 #ifdef __cplusplus
mbed_official 579:53297373a894 8 extern "C" {
mbed_official 579:53297373a894 9 #endif
mbed_official 579:53297373a894 10
mbed_official 579:53297373a894 11 /**
mbed_official 579:53297373a894 12 * \name Convenience functions for busy-wait delay loops
mbed_official 579:53297373a894 13 *
mbed_official 579:53297373a894 14 * @{
mbed_official 579:53297373a894 15 */
mbed_official 579:53297373a894 16
mbed_official 579:53297373a894 17 /**
mbed_official 579:53297373a894 18 * \brief Delay loop to delay n number of cycles
mbed_official 579:53297373a894 19 * Delay program execution for at least the specified number of CPU cycles.
mbed_official 579:53297373a894 20 *
mbed_official 579:53297373a894 21 * \param n Number of cycles to delay
mbed_official 579:53297373a894 22 */
mbed_official 579:53297373a894 23 static inline void delay_cycles(
mbed_official 579:53297373a894 24 const uint32_t n)
mbed_official 579:53297373a894 25 {
mbed_official 579:53297373a894 26 if (n > 0) {
mbed_official 579:53297373a894 27 SysTick->LOAD = n;
mbed_official 579:53297373a894 28 SysTick->VAL = 0;
mbed_official 579:53297373a894 29
mbed_official 579:53297373a894 30 while (!(SysTick->CTRL & SysTick_CTRL_COUNTFLAG_Msk)) {
mbed_official 579:53297373a894 31 };
mbed_official 579:53297373a894 32 }
mbed_official 579:53297373a894 33 }
mbed_official 579:53297373a894 34
mbed_official 579:53297373a894 35 void delay_cycles_us(uint32_t n);
mbed_official 579:53297373a894 36
mbed_official 579:53297373a894 37 void delay_cycles_ms(uint32_t n);
mbed_official 579:53297373a894 38
mbed_official 579:53297373a894 39 /**
mbed_official 579:53297373a894 40 * \brief Delay program execution for at least the specified number of microseconds.
mbed_official 579:53297373a894 41 *
mbed_official 579:53297373a894 42 * \param delay number of microseconds to wait
mbed_official 579:53297373a894 43 */
mbed_official 579:53297373a894 44 #define cpu_delay_us(delay) delay_cycles_us(delay)
mbed_official 579:53297373a894 45
mbed_official 579:53297373a894 46 /**
mbed_official 579:53297373a894 47 * \brief Delay program execution for at least the specified number of milliseconds.
mbed_official 579:53297373a894 48 *
mbed_official 579:53297373a894 49 * \param delay number of milliseconds to wait
mbed_official 579:53297373a894 50 */
mbed_official 579:53297373a894 51 #define cpu_delay_ms(delay) delay_cycles_ms(delay)
mbed_official 579:53297373a894 52
mbed_official 579:53297373a894 53 /**
mbed_official 579:53297373a894 54 * \brief Delay program execution for at least the specified number of seconds.
mbed_official 579:53297373a894 55 *
mbed_official 579:53297373a894 56 * \param delay number of seconds to wait
mbed_official 579:53297373a894 57 */
mbed_official 579:53297373a894 58 #define cpu_delay_s(delay) delay_cycles_ms(1000 * delay)
mbed_official 579:53297373a894 59
mbed_official 579:53297373a894 60 /**
mbed_official 579:53297373a894 61 * @}
mbed_official 579:53297373a894 62 */
mbed_official 579:53297373a894 63
mbed_official 579:53297373a894 64 #ifdef __cplusplus
mbed_official 579:53297373a894 65 }
mbed_official 579:53297373a894 66 #endif
mbed_official 579:53297373a894 67
mbed_official 579:53297373a894 68 #endif /* CYCLE_COUNTER_H_INCLUDED */