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targets/cmsis/TARGET_WIZNET/TARGET_W7500x/system_W7500x.c@636:2405a6d45c2c, 2016-05-23 (annotated)

Committer:
dconsoli
Date:
Mon May 23 02:17:28 2016 +0000
Revision:
636:2405a6d45c2c
Parent:
619:034e698bc035 
I don't know;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 558:0880f51c4036 1 /**************************************************************************//**
mbed_official 558:0880f51c4036 2 * @file system_CMSDK_CM0.c
mbed_official 558:0880f51c4036 3 * @brief CMSIS Cortex-M0 Device Peripheral Access Layer Source File for
mbed_official 558:0880f51c4036 4 * Device CMSDK
mbed_official 558:0880f51c4036 5 * @version V3.01
mbed_official 558:0880f51c4036 6 * @date 06. March 2012
mbed_official 558:0880f51c4036 7 *
mbed_official 558:0880f51c4036 8 * @note
mbed_official 558:0880f51c4036 9 * Copyright (C) 2010-2012 ARM Limited. All rights reserved.
mbed_official 558:0880f51c4036 10 *
mbed_official 558:0880f51c4036 11 * @par
mbed_official 558:0880f51c4036 12 * ARM Limited (ARM) is supplying this software for use with Cortex-M
mbed_official 558:0880f51c4036 13 * processor based microcontrollers. This file can be freely distributed
mbed_official 558:0880f51c4036 14 * within development tools that are supporting such ARM based processors.
mbed_official 558:0880f51c4036 15 *
mbed_official 558:0880f51c4036 16 * @par
mbed_official 558:0880f51c4036 17 * THIS SOFTWARE IS PROVIDED "AS IS". NO WARRANTIES, WHETHER EXPRESS, IMPLIED
mbed_official 558:0880f51c4036 18 * OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF
mbed_official 558:0880f51c4036 19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE.
mbed_official 558:0880f51c4036 20 * ARM SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR
mbed_official 558:0880f51c4036 21 * CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.
mbed_official 558:0880f51c4036 22 *
mbed_official 558:0880f51c4036 23 ******************************************************************************/
mbed_official 558:0880f51c4036 24
mbed_official 558:0880f51c4036 25
mbed_official 558:0880f51c4036 26 #include "system_W7500x.h"
mbed_official 558:0880f51c4036 27
mbed_official 558:0880f51c4036 28
mbed_official 558:0880f51c4036 29 /*----------------------------------------------------------------------------
mbed_official 558:0880f51c4036 30 DEFINES
mbed_official 558:0880f51c4036 31 *----------------------------------------------------------------------------*/
mbed_official 558:0880f51c4036 32 //#define SYSCLK_EXTERN_OSC
mbed_official 558:0880f51c4036 33
mbed_official 558:0880f51c4036 34
mbed_official 558:0880f51c4036 35
mbed_official 558:0880f51c4036 36 /*----------------------------------------------------------------------------
mbed_official 558:0880f51c4036 37 Clock Variable definitions
mbed_official 558:0880f51c4036 38 *----------------------------------------------------------------------------*/
mbed_official 558:0880f51c4036 39 uint32_t SystemFrequency = 0; /*!< System Clock Frequency (Core Clock) */
mbed_official 558:0880f51c4036 40 uint32_t SystemCoreClock = 0; /*!< Processor Clock Frequency */
mbed_official 558:0880f51c4036 41
mbed_official 558:0880f51c4036 42
mbed_official 558:0880f51c4036 43 /*----------------------------------------------------------------------------
mbed_official 558:0880f51c4036 44 Clock functions
mbed_official 558:0880f51c4036 45 *----------------------------------------------------------------------------*/
mbed_official 558:0880f51c4036 46 void SystemCoreClockUpdate (void) /* Get Core Clock Frequency */
mbed_official 558:0880f51c4036 47 {
mbed_official 558:0880f51c4036 48 uint8_t M,N,OD;
mbed_official 558:0880f51c4036 49
mbed_official 558:0880f51c4036 50 #ifdef SYSCLK_EXTERN_OSC
mbed_official 558:0880f51c4036 51 CRG->PLL_IFSR = CRG_PLL_IFSR_OCLK;
mbed_official 558:0880f51c4036 52 #else
mbed_official 558:0880f51c4036 53 CRG->PLL_IFSR = CRG_PLL_IFSR_RCLK;
mbed_official 558:0880f51c4036 54 #endif
mbed_official 558:0880f51c4036 55 OD = (1 << (CRG->PLL_FCR & 0x01)) * (1 << ((CRG->PLL_FCR & 0x02) >> 1));
mbed_official 558:0880f51c4036 56 N = (CRG->PLL_FCR >> 8 ) & 0x3F;
mbed_official 558:0880f51c4036 57 M = (CRG->PLL_FCR >> 16) & 0x3F;
mbed_official 558:0880f51c4036 58
mbed_official 558:0880f51c4036 59 #ifdef SYSCLK_EXTERN_OSC
mbed_official 558:0880f51c4036 60 SystemCoreClock = EXTERN_XTAL * M / N * 1 / OD;
mbed_official 558:0880f51c4036 61 #else
mbed_official 558:0880f51c4036 62 SystemCoreClock = INTERN_XTAL * M / N * 1 / OD;
mbed_official 558:0880f51c4036 63 #endif
mbed_official 558:0880f51c4036 64 }
mbed_official 558:0880f51c4036 65
mbed_official 558:0880f51c4036 66 uint32_t GetSystemClock()
mbed_official 558:0880f51c4036 67 {
mbed_official 558:0880f51c4036 68 return SystemCoreClock;
mbed_official 558:0880f51c4036 69 }
mbed_official 558:0880f51c4036 70
mbed_official 558:0880f51c4036 71
mbed_official 558:0880f51c4036 72 /**
mbed_official 558:0880f51c4036 73 * Initialize the system
mbed_official 558:0880f51c4036 74 *
mbed_official 558:0880f51c4036 75 * @param none
mbed_official 558:0880f51c4036 76 * @return none
mbed_official 558:0880f51c4036 77 *
mbed_official 558:0880f51c4036 78 * @brief Setup the microcontroller system.
mbed_official 558:0880f51c4036 79 * Initialize the System.
mbed_official 558:0880f51c4036 80 */
mbed_official 558:0880f51c4036 81 void SystemInit (void)
mbed_official 558:0880f51c4036 82 {
mbed_official 558:0880f51c4036 83 uint8_t M,N,OD;
mbed_official 558:0880f51c4036 84
mbed_official 558:0880f51c4036 85 (*((volatile uint32_t *)(W7500x_TRIM_BGT))) = (*((volatile uint32_t *)(W7500x_INFO_BGT)));
mbed_official 558:0880f51c4036 86 (*((volatile uint32_t *)(W7500x_TRIM_OSC))) = (*((volatile uint32_t *)(W7500x_INFO_OSC)));
mbed_official 558:0880f51c4036 87
mbed_official 558:0880f51c4036 88
mbed_official 558:0880f51c4036 89 // Set PLL input frequency
mbed_official 558:0880f51c4036 90 #ifdef SYSCLK_EXTERN_OSC
mbed_official 558:0880f51c4036 91 CRG->PLL_IFSR = CRG_PLL_IFSR_OCLK;
mbed_official 558:0880f51c4036 92 #else
mbed_official 558:0880f51c4036 93 CRG->PLL_IFSR = CRG_PLL_IFSR_RCLK;
mbed_official 558:0880f51c4036 94 #endif
mbed_official 558:0880f51c4036 95 OD = (1 << (CRG->PLL_FCR & 0x01)) * (1 << ((CRG->PLL_FCR & 0x02) >> 1));
mbed_official 558:0880f51c4036 96 N = (CRG->PLL_FCR >> 8 ) & 0x3F;
mbed_official 558:0880f51c4036 97 M = (CRG->PLL_FCR >> 16) & 0x3F;
mbed_official 558:0880f51c4036 98
mbed_official 558:0880f51c4036 99 #ifdef SYSCLK_EXTERN_OSC
mbed_official 558:0880f51c4036 100 SystemCoreClock = EXTERN_XTAL * M / N * 1 / OD;
mbed_official 558:0880f51c4036 101 #else
mbed_official 558:0880f51c4036 102 SystemCoreClock = INTERN_XTAL * M / N * 1 / OD;
mbed_official 558:0880f51c4036 103 #endif
mbed_official 558:0880f51c4036 104 }