marcus chiou / mbed-src

mbed library sources

Fork of mbed-src by mbed official

targets/cmsis/TARGET_Atmel/TARGET_SAM21/TARGET_SAMR21G18A/system_samr21.c@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 #include "samr21g18a.h"
mbed_official 579:53297373a894 2
mbed_official 579:53297373a894 3 /**
mbed_official 579:53297373a894 4 * Initial system clock frequency. The System RC Oscillator (RCSYS) provides
mbed_official 579:53297373a894 5 * the source for the main clock at chip startup.
mbed_official 579:53297373a894 6 */
mbed_official 579:53297373a894 7 #define __SYSTEM_CLOCK (1000000)
mbed_official 579:53297373a894 8
mbed_official 579:53297373a894 9 uint32_t SystemCoreClock = __SYSTEM_CLOCK;/*!< System Clock Frequency (Core Clock)*/
mbed_official 579:53297373a894 10
mbed_official 579:53297373a894 11 /**
mbed_official 579:53297373a894 12 * Initialize the system
mbed_official 579:53297373a894 13 *
mbed_official 579:53297373a894 14 * @brief Setup the microcontroller system.
mbed_official 579:53297373a894 15 * Initialize the System and update the SystemCoreClock variable.
mbed_official 579:53297373a894 16 */
mbed_official 579:53297373a894 17 void SystemInit(void)
mbed_official 579:53297373a894 18 {
mbed_official 579:53297373a894 19 // Keep the default device state after reset
mbed_official 579:53297373a894 20 SystemCoreClock = __SYSTEM_CLOCK;
mbed_official 579:53297373a894 21 return;
mbed_official 579:53297373a894 22 }
mbed_official 579:53297373a894 23
mbed_official 579:53297373a894 24 /**
mbed_official 579:53297373a894 25 * Update SystemCoreClock variable
mbed_official 579:53297373a894 26 *
mbed_official 579:53297373a894 27 * @brief Updates the SystemCoreClock with current core Clock
mbed_official 579:53297373a894 28 * retrieved from cpu registers.
mbed_official 579:53297373a894 29 */
mbed_official 579:53297373a894 30 void SystemCoreClockUpdate(void)
mbed_official 579:53297373a894 31 {
mbed_official 579:53297373a894 32 // Not implemented
mbed_official 579:53297373a894 33 SystemCoreClock = __SYSTEM_CLOCK;
mbed_official 579:53297373a894 34 return;
mbed_official 579:53297373a894 35 }