Julien Cassette / mbed-dev

Important changes to repositories hosted on mbed.com

Mbed hosted mercurial repositories are deprecated and are due to be permanently deleted in July 2026.

To keep a copy of this software download the repository Zip archive or clone locally using Mercurial.

It is also possible to export all your personal repositories from the account settings page.

Fork of mbed-dev by mbed official

targets/cmsis/TARGET_Silicon_Labs/TARGET_EFM32/TARGET_EFM32WG_STK3800/system_efm32wg.c@50:a417edff4437, 2016-01-15 (annotated)

Committer:
mbed_official
Date:
Fri Jan 15 07:45:16 2016 +0000
Revision:
50:a417edff4437
Parent:
0:9b334a45a8ff 
Synchronized with git revision 6010f32619bfcbb01cc73747d4ff9040863482d9



Full URL: https://github.com/mbedmicro/mbed/commit/6010f32619bfcbb01cc73747d4ff9040863482d9/



Remove doubling of buffer size in realiseEndpoint()

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bogdanm 0:9b334a45a8ff 1 /***************************************************************************//**
bogdanm 0:9b334a45a8ff 2 * @file system_efm32wg.c
bogdanm 0:9b334a45a8ff 3 * @brief CMSIS Cortex-M4 System Layer for EFM32WG devices.
mbed_official 50:a417edff4437 4 * @version 4.2.0
bogdanm 0:9b334a45a8ff 5 ******************************************************************************
bogdanm 0:9b334a45a8ff 6 * @section License
mbed_official 50:a417edff4437 7 * <b>Copyright 2015 Silicon Laboratories, Inc. http://www.silabs.com</b>
bogdanm 0:9b334a45a8ff 8 ******************************************************************************
bogdanm 0:9b334a45a8ff 9 *
bogdanm 0:9b334a45a8ff 10 * Permission is granted to anyone to use this software for any purpose,
bogdanm 0:9b334a45a8ff 11 * including commercial applications, and to alter it and redistribute it
bogdanm 0:9b334a45a8ff 12 * freely, subject to the following restrictions:
bogdanm 0:9b334a45a8ff 13 *
bogdanm 0:9b334a45a8ff 14 * 1. The origin of this software must not be misrepresented; you must not
bogdanm 0:9b334a45a8ff 15 * claim that you wrote the original software.@n
bogdanm 0:9b334a45a8ff 16 * 2. Altered source versions must be plainly marked as such, and must not be
bogdanm 0:9b334a45a8ff 17 * misrepresented as being the original software.@n
bogdanm 0:9b334a45a8ff 18 * 3. This notice may not be removed or altered from any source distribution.
bogdanm 0:9b334a45a8ff 19 *
bogdanm 0:9b334a45a8ff 20 * DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Silicon Laboratories, Inc.
bogdanm 0:9b334a45a8ff 21 * has no obligation to support this Software. Silicon Laboratories, Inc. is
bogdanm 0:9b334a45a8ff 22 * providing the Software "AS IS", with no express or implied warranties of any
mbed_official 50:a417edff4437 23 * kind, including, but not limited to, any implied warranties of
bogdanm 0:9b334a45a8ff 24 * merchantability or fitness for any particular purpose or warranties against
bogdanm 0:9b334a45a8ff 25 * infringement of any proprietary rights of a third party.
bogdanm 0:9b334a45a8ff 26 *
mbed_official 50:a417edff4437 27 * Silicon Laboratories, Inc. will not be liable for any consequential,
mbed_official 50:a417edff4437 28 * incidental, or special damages, or any other relief, or for any claim by
bogdanm 0:9b334a45a8ff 29 * any third party, arising from your use of this Software.
bogdanm 0:9b334a45a8ff 30 *
bogdanm 0:9b334a45a8ff 31 *****************************************************************************/
bogdanm 0:9b334a45a8ff 32
bogdanm 0:9b334a45a8ff 33 #include <stdint.h>
bogdanm 0:9b334a45a8ff 34 #include "em_device.h"
bogdanm 0:9b334a45a8ff 35
bogdanm 0:9b334a45a8ff 36 /*******************************************************************************
bogdanm 0:9b334a45a8ff 37 ****************************** DEFINES ************************************
bogdanm 0:9b334a45a8ff 38 ******************************************************************************/
bogdanm 0:9b334a45a8ff 39
bogdanm 0:9b334a45a8ff 40 /** LFRCO frequency, tuned to below frequency during manufacturing. */
bogdanm 0:9b334a45a8ff 41 #define EFM32_LFRCO_FREQ (32768UL)
bogdanm 0:9b334a45a8ff 42 #define EFM32_ULFRCO_FREQ (1000UL)
bogdanm 0:9b334a45a8ff 43
bogdanm 0:9b334a45a8ff 44 /*******************************************************************************
bogdanm 0:9b334a45a8ff 45 ************************** LOCAL VARIABLES ********************************
bogdanm 0:9b334a45a8ff 46 ******************************************************************************/
bogdanm 0:9b334a45a8ff 47
bogdanm 0:9b334a45a8ff 48 /* System oscillator frequencies. These frequencies are normally constant */
bogdanm 0:9b334a45a8ff 49 /* for a target, but they are made configurable in order to allow run-time */
bogdanm 0:9b334a45a8ff 50 /* handling of different boards. The crystal oscillator clocks can be set */
bogdanm 0:9b334a45a8ff 51 /* compile time to a non-default value by defining respective EFM32_nFXO_FREQ */
bogdanm 0:9b334a45a8ff 52 /* values according to board design. By defining the EFM32_nFXO_FREQ to 0, */
bogdanm 0:9b334a45a8ff 53 /* one indicates that the oscillator is not present, in order to save some */
bogdanm 0:9b334a45a8ff 54 /* SW footprint. */
bogdanm 0:9b334a45a8ff 55
bogdanm 0:9b334a45a8ff 56 #ifndef EFM32_HFXO_FREQ
mbed_official 50:a417edff4437 57 #define EFM32_HFXO_FREQ (48000000UL)
bogdanm 0:9b334a45a8ff 58 #endif
mbed_official 50:a417edff4437 59
mbed_official 50:a417edff4437 60 #define EFM32_HFRCO_MAX_FREQ (28000000UL)
mbed_official 50:a417edff4437 61
bogdanm 0:9b334a45a8ff 62 /* Do not define variable if HF crystal oscillator not present */
bogdanm 0:9b334a45a8ff 63 #if (EFM32_HFXO_FREQ > 0)
bogdanm 0:9b334a45a8ff 64 /** @cond DO_NOT_INCLUDE_WITH_DOXYGEN */
mbed_official 50:a417edff4437 65 /** System HFXO clock. */
bogdanm 0:9b334a45a8ff 66 static uint32_t SystemHFXOClock = EFM32_HFXO_FREQ;
bogdanm 0:9b334a45a8ff 67 /** @endcond (DO_NOT_INCLUDE_WITH_DOXYGEN) */
bogdanm 0:9b334a45a8ff 68 #endif
bogdanm 0:9b334a45a8ff 69
mbed_official 50:a417edff4437 70 #ifndef EFM32_LFXO_FREQ
bogdanm 0:9b334a45a8ff 71 #define EFM32_LFXO_FREQ (EFM32_LFRCO_FREQ)
bogdanm 0:9b334a45a8ff 72 #endif
mbed_official 50:a417edff4437 73
bogdanm 0:9b334a45a8ff 74 /* Do not define variable if LF crystal oscillator not present */
bogdanm 0:9b334a45a8ff 75 #if (EFM32_LFXO_FREQ > 0)
bogdanm 0:9b334a45a8ff 76 /** @cond DO_NOT_INCLUDE_WITH_DOXYGEN */
mbed_official 50:a417edff4437 77 /** System LFXO clock. */
bogdanm 0:9b334a45a8ff 78 static uint32_t SystemLFXOClock = EFM32_LFXO_FREQ;
bogdanm 0:9b334a45a8ff 79 /** @endcond (DO_NOT_INCLUDE_WITH_DOXYGEN) */
bogdanm 0:9b334a45a8ff 80 #endif
bogdanm 0:9b334a45a8ff 81
bogdanm 0:9b334a45a8ff 82 /* Inline function to get the chip's Production Revision. */
bogdanm 0:9b334a45a8ff 83 __STATIC_INLINE uint8_t GetProdRev(void)
bogdanm 0:9b334a45a8ff 84 {
bogdanm 0:9b334a45a8ff 85 return ((DEVINFO->PART & _DEVINFO_PART_PROD_REV_MASK)
bogdanm 0:9b334a45a8ff 86 >> _DEVINFO_PART_PROD_REV_SHIFT);
bogdanm 0:9b334a45a8ff 87 }
bogdanm 0:9b334a45a8ff 88
bogdanm 0:9b334a45a8ff 89 /*******************************************************************************
bogdanm 0:9b334a45a8ff 90 ************************** GLOBAL VARIABLES *******************************
bogdanm 0:9b334a45a8ff 91 ******************************************************************************/
bogdanm 0:9b334a45a8ff 92
bogdanm 0:9b334a45a8ff 93 /**
bogdanm 0:9b334a45a8ff 94 * @brief
bogdanm 0:9b334a45a8ff 95 * System System Clock Frequency (Core Clock).
bogdanm 0:9b334a45a8ff 96 *
bogdanm 0:9b334a45a8ff 97 * @details
bogdanm 0:9b334a45a8ff 98 * Required CMSIS global variable that must be kept up-to-date.
bogdanm 0:9b334a45a8ff 99 */
bogdanm 0:9b334a45a8ff 100 uint32_t SystemCoreClock;
bogdanm 0:9b334a45a8ff 101
bogdanm 0:9b334a45a8ff 102 /*******************************************************************************
bogdanm 0:9b334a45a8ff 103 ************************** GLOBAL FUNCTIONS *******************************
bogdanm 0:9b334a45a8ff 104 ******************************************************************************/
bogdanm 0:9b334a45a8ff 105
bogdanm 0:9b334a45a8ff 106 /***************************************************************************//**
bogdanm 0:9b334a45a8ff 107 * @brief
bogdanm 0:9b334a45a8ff 108 * Get the current core clock frequency.
bogdanm 0:9b334a45a8ff 109 *
bogdanm 0:9b334a45a8ff 110 * @details
bogdanm 0:9b334a45a8ff 111 * Calculate and get the current core clock frequency based on the current
bogdanm 0:9b334a45a8ff 112 * configuration. Assuming that the SystemCoreClock global variable is
bogdanm 0:9b334a45a8ff 113 * maintained, the core clock frequency is stored in that variable as well.
bogdanm 0:9b334a45a8ff 114 * This function will however calculate the core clock based on actual HW
bogdanm 0:9b334a45a8ff 115 * configuration. It will also update the SystemCoreClock global variable.
bogdanm 0:9b334a45a8ff 116 *
bogdanm 0:9b334a45a8ff 117 * @note
bogdanm 0:9b334a45a8ff 118 * This is an EFM32 proprietary function, not part of the CMSIS definition.
bogdanm 0:9b334a45a8ff 119 *
bogdanm 0:9b334a45a8ff 120 * @return
bogdanm 0:9b334a45a8ff 121 * The current core clock frequency in Hz.
bogdanm 0:9b334a45a8ff 122 ******************************************************************************/
bogdanm 0:9b334a45a8ff 123 uint32_t SystemCoreClockGet(void)
bogdanm 0:9b334a45a8ff 124 {
bogdanm 0:9b334a45a8ff 125 uint32_t ret;
mbed_official 50:a417edff4437 126
bogdanm 0:9b334a45a8ff 127 ret = SystemHFClockGet();
bogdanm 0:9b334a45a8ff 128 /* Leopard/Giant/Wonder Gecko has an additional divider */
bogdanm 0:9b334a45a8ff 129 ret = ret / (1 + ((CMU->CTRL & _CMU_CTRL_HFCLKDIV_MASK)>>_CMU_CTRL_HFCLKDIV_SHIFT));
mbed_official 50:a417edff4437 130 ret >>= (CMU->HFCORECLKDIV & _CMU_HFCORECLKDIV_HFCORECLKDIV_MASK) >>
bogdanm 0:9b334a45a8ff 131 _CMU_HFCORECLKDIV_HFCORECLKDIV_SHIFT;
bogdanm 0:9b334a45a8ff 132
bogdanm 0:9b334a45a8ff 133 /* Keep CMSIS variable up-to-date just in case */
bogdanm 0:9b334a45a8ff 134 SystemCoreClock = ret;
bogdanm 0:9b334a45a8ff 135
bogdanm 0:9b334a45a8ff 136 return ret;
bogdanm 0:9b334a45a8ff 137 }
bogdanm 0:9b334a45a8ff 138
bogdanm 0:9b334a45a8ff 139
bogdanm 0:9b334a45a8ff 140 /***************************************************************************//**
bogdanm 0:9b334a45a8ff 141 * @brief
mbed_official 50:a417edff4437 142 * Get the maximum core clock frequency.
mbed_official 50:a417edff4437 143 *
mbed_official 50:a417edff4437 144 * @note
mbed_official 50:a417edff4437 145 * This is an EFR32 proprietary function, not part of the CMSIS definition.
mbed_official 50:a417edff4437 146 *
mbed_official 50:a417edff4437 147 * @return
mbed_official 50:a417edff4437 148 * The maximum core clock frequency in Hz.
mbed_official 50:a417edff4437 149 ******************************************************************************/
mbed_official 50:a417edff4437 150 uint32_t SystemMaxCoreClockGet(void)
mbed_official 50:a417edff4437 151 {
mbed_official 50:a417edff4437 152 return (EFM32_HFRCO_MAX_FREQ > EFM32_HFXO_FREQ ? \
mbed_official 50:a417edff4437 153 EFM32_HFRCO_MAX_FREQ : EFM32_HFXO_FREQ);
mbed_official 50:a417edff4437 154 }
mbed_official 50:a417edff4437 155
mbed_official 50:a417edff4437 156
mbed_official 50:a417edff4437 157 /***************************************************************************//**
mbed_official 50:a417edff4437 158 * @brief
bogdanm 0:9b334a45a8ff 159 * Get the current HFCLK frequency.
bogdanm 0:9b334a45a8ff 160 *
bogdanm 0:9b334a45a8ff 161 * @note
bogdanm 0:9b334a45a8ff 162 * This is an EFM32 proprietary function, not part of the CMSIS definition.
bogdanm 0:9b334a45a8ff 163 *
bogdanm 0:9b334a45a8ff 164 * @return
bogdanm 0:9b334a45a8ff 165 * The current HFCLK frequency in Hz.
bogdanm 0:9b334a45a8ff 166 ******************************************************************************/
bogdanm 0:9b334a45a8ff 167 uint32_t SystemHFClockGet(void)
bogdanm 0:9b334a45a8ff 168 {
bogdanm 0:9b334a45a8ff 169 uint32_t ret;
mbed_official 50:a417edff4437 170
bogdanm 0:9b334a45a8ff 171 switch (CMU->STATUS & (CMU_STATUS_HFRCOSEL | CMU_STATUS_HFXOSEL |
bogdanm 0:9b334a45a8ff 172 CMU_STATUS_LFRCOSEL | CMU_STATUS_LFXOSEL))
bogdanm 0:9b334a45a8ff 173 {
bogdanm 0:9b334a45a8ff 174 case CMU_STATUS_LFXOSEL:
bogdanm 0:9b334a45a8ff 175 #if (EFM32_LFXO_FREQ > 0)
bogdanm 0:9b334a45a8ff 176 ret = SystemLFXOClock;
bogdanm 0:9b334a45a8ff 177 #else
bogdanm 0:9b334a45a8ff 178 /* We should not get here, since core should not be clocked. May */
bogdanm 0:9b334a45a8ff 179 /* be caused by a misconfiguration though. */
bogdanm 0:9b334a45a8ff 180 ret = 0;
bogdanm 0:9b334a45a8ff 181 #endif
bogdanm 0:9b334a45a8ff 182 break;
mbed_official 50:a417edff4437 183
bogdanm 0:9b334a45a8ff 184 case CMU_STATUS_LFRCOSEL:
bogdanm 0:9b334a45a8ff 185 ret = EFM32_LFRCO_FREQ;
bogdanm 0:9b334a45a8ff 186 break;
mbed_official 50:a417edff4437 187
bogdanm 0:9b334a45a8ff 188 case CMU_STATUS_HFXOSEL:
bogdanm 0:9b334a45a8ff 189 #if (EFM32_HFXO_FREQ > 0)
bogdanm 0:9b334a45a8ff 190 ret = SystemHFXOClock;
bogdanm 0:9b334a45a8ff 191 #else
bogdanm 0:9b334a45a8ff 192 /* We should not get here, since core should not be clocked. May */
bogdanm 0:9b334a45a8ff 193 /* be caused by a misconfiguration though. */
bogdanm 0:9b334a45a8ff 194 ret = 0;
bogdanm 0:9b334a45a8ff 195 #endif
bogdanm 0:9b334a45a8ff 196 break;
mbed_official 50:a417edff4437 197
bogdanm 0:9b334a45a8ff 198 default: /* CMU_STATUS_HFRCOSEL */
bogdanm 0:9b334a45a8ff 199 switch (CMU->HFRCOCTRL & _CMU_HFRCOCTRL_BAND_MASK)
bogdanm 0:9b334a45a8ff 200 {
bogdanm 0:9b334a45a8ff 201 case CMU_HFRCOCTRL_BAND_28MHZ:
bogdanm 0:9b334a45a8ff 202 ret = 28000000;
bogdanm 0:9b334a45a8ff 203 break;
bogdanm 0:9b334a45a8ff 204
bogdanm 0:9b334a45a8ff 205 case CMU_HFRCOCTRL_BAND_21MHZ:
bogdanm 0:9b334a45a8ff 206 ret = 21000000;
bogdanm 0:9b334a45a8ff 207 break;
bogdanm 0:9b334a45a8ff 208
bogdanm 0:9b334a45a8ff 209 case CMU_HFRCOCTRL_BAND_14MHZ:
bogdanm 0:9b334a45a8ff 210 ret = 14000000;
bogdanm 0:9b334a45a8ff 211 break;
bogdanm 0:9b334a45a8ff 212
bogdanm 0:9b334a45a8ff 213 case CMU_HFRCOCTRL_BAND_11MHZ:
bogdanm 0:9b334a45a8ff 214 ret = 11000000;
bogdanm 0:9b334a45a8ff 215 break;
bogdanm 0:9b334a45a8ff 216
bogdanm 0:9b334a45a8ff 217 case CMU_HFRCOCTRL_BAND_7MHZ:
bogdanm 0:9b334a45a8ff 218 if ( GetProdRev() >= 19 )
bogdanm 0:9b334a45a8ff 219 ret = 6600000;
bogdanm 0:9b334a45a8ff 220 else
bogdanm 0:9b334a45a8ff 221 ret = 7000000;
bogdanm 0:9b334a45a8ff 222 break;
bogdanm 0:9b334a45a8ff 223
bogdanm 0:9b334a45a8ff 224 case CMU_HFRCOCTRL_BAND_1MHZ:
bogdanm 0:9b334a45a8ff 225 if ( GetProdRev() >= 19 )
bogdanm 0:9b334a45a8ff 226 ret = 1200000;
bogdanm 0:9b334a45a8ff 227 else
bogdanm 0:9b334a45a8ff 228 ret = 1000000;
bogdanm 0:9b334a45a8ff 229 break;
bogdanm 0:9b334a45a8ff 230
bogdanm 0:9b334a45a8ff 231 default:
bogdanm 0:9b334a45a8ff 232 ret = 0;
bogdanm 0:9b334a45a8ff 233 break;
bogdanm 0:9b334a45a8ff 234 }
bogdanm 0:9b334a45a8ff 235 break;
bogdanm 0:9b334a45a8ff 236 }
bogdanm 0:9b334a45a8ff 237
bogdanm 0:9b334a45a8ff 238 return ret;
bogdanm 0:9b334a45a8ff 239 }
bogdanm 0:9b334a45a8ff 240
bogdanm 0:9b334a45a8ff 241
bogdanm 0:9b334a45a8ff 242 /**************************************************************************//**
bogdanm 0:9b334a45a8ff 243 * @brief
bogdanm 0:9b334a45a8ff 244 * Get high frequency crystal oscillator clock frequency for target system.
bogdanm 0:9b334a45a8ff 245 *
bogdanm 0:9b334a45a8ff 246 * @note
bogdanm 0:9b334a45a8ff 247 * This is an EFM32 proprietary function, not part of the CMSIS definition.
bogdanm 0:9b334a45a8ff 248 *
bogdanm 0:9b334a45a8ff 249 * @return
bogdanm 0:9b334a45a8ff 250 * HFXO frequency in Hz.
bogdanm 0:9b334a45a8ff 251 *****************************************************************************/
bogdanm 0:9b334a45a8ff 252 uint32_t SystemHFXOClockGet(void)
bogdanm 0:9b334a45a8ff 253 {
bogdanm 0:9b334a45a8ff 254 /* External crystal oscillator present? */
bogdanm 0:9b334a45a8ff 255 #if (EFM32_HFXO_FREQ > 0)
bogdanm 0:9b334a45a8ff 256 return SystemHFXOClock;
bogdanm 0:9b334a45a8ff 257 #else
bogdanm 0:9b334a45a8ff 258 return 0;
bogdanm 0:9b334a45a8ff 259 #endif
bogdanm 0:9b334a45a8ff 260 }
bogdanm 0:9b334a45a8ff 261
bogdanm 0:9b334a45a8ff 262
bogdanm 0:9b334a45a8ff 263 /**************************************************************************//**
bogdanm 0:9b334a45a8ff 264 * @brief
bogdanm 0:9b334a45a8ff 265 * Set high frequency crystal oscillator clock frequency for target system.
bogdanm 0:9b334a45a8ff 266 *
bogdanm 0:9b334a45a8ff 267 * @note
bogdanm 0:9b334a45a8ff 268 * This function is mainly provided for being able to handle target systems
bogdanm 0:9b334a45a8ff 269 * with different HF crystal oscillator frequencies run-time. If used, it
bogdanm 0:9b334a45a8ff 270 * should probably only be used once during system startup.
bogdanm 0:9b334a45a8ff 271 *
bogdanm 0:9b334a45a8ff 272 * @note
bogdanm 0:9b334a45a8ff 273 * This is an EFM32 proprietary function, not part of the CMSIS definition.
bogdanm 0:9b334a45a8ff 274 *
bogdanm 0:9b334a45a8ff 275 * @param[in] freq
bogdanm 0:9b334a45a8ff 276 * HFXO frequency in Hz used for target.
bogdanm 0:9b334a45a8ff 277 *****************************************************************************/
bogdanm 0:9b334a45a8ff 278 void SystemHFXOClockSet(uint32_t freq)
bogdanm 0:9b334a45a8ff 279 {
bogdanm 0:9b334a45a8ff 280 /* External crystal oscillator present? */
bogdanm 0:9b334a45a8ff 281 #if (EFM32_HFXO_FREQ > 0)
bogdanm 0:9b334a45a8ff 282 SystemHFXOClock = freq;
bogdanm 0:9b334a45a8ff 283
bogdanm 0:9b334a45a8ff 284 /* Update core clock frequency if HFXO is used to clock core */
bogdanm 0:9b334a45a8ff 285 if (CMU->STATUS & CMU_STATUS_HFXOSEL)
bogdanm 0:9b334a45a8ff 286 {
bogdanm 0:9b334a45a8ff 287 /* The function will update the global variable */
bogdanm 0:9b334a45a8ff 288 SystemCoreClockGet();
bogdanm 0:9b334a45a8ff 289 }
bogdanm 0:9b334a45a8ff 290 #else
bogdanm 0:9b334a45a8ff 291 (void)freq; /* Unused parameter */
bogdanm 0:9b334a45a8ff 292 #endif
bogdanm 0:9b334a45a8ff 293 }
bogdanm 0:9b334a45a8ff 294
bogdanm 0:9b334a45a8ff 295
bogdanm 0:9b334a45a8ff 296 /**************************************************************************//**
bogdanm 0:9b334a45a8ff 297 * @brief
bogdanm 0:9b334a45a8ff 298 * Initialize the system.
bogdanm 0:9b334a45a8ff 299 *
bogdanm 0:9b334a45a8ff 300 * @details
bogdanm 0:9b334a45a8ff 301 * Do required generic HW system init.
bogdanm 0:9b334a45a8ff 302 *
bogdanm 0:9b334a45a8ff 303 * @note
bogdanm 0:9b334a45a8ff 304 * This function is invoked during system init, before the main() routine
bogdanm 0:9b334a45a8ff 305 * and any data has been initialized. For this reason, it cannot do any
bogdanm 0:9b334a45a8ff 306 * initialization of variables etc.
bogdanm 0:9b334a45a8ff 307 *****************************************************************************/
bogdanm 0:9b334a45a8ff 308 void SystemInit(void)
bogdanm 0:9b334a45a8ff 309 {
bogdanm 0:9b334a45a8ff 310 /* Set floating point coprosessor access mode. */
bogdanm 0:9b334a45a8ff 311 SCB->CPACR |= ((3UL << 10*2) | /* set CP10 Full Access */
bogdanm 0:9b334a45a8ff 312 (3UL << 11*2) ); /* set CP11 Full Access */
bogdanm 0:9b334a45a8ff 313 }
bogdanm 0:9b334a45a8ff 314
bogdanm 0:9b334a45a8ff 315
bogdanm 0:9b334a45a8ff 316 /**************************************************************************//**
bogdanm 0:9b334a45a8ff 317 * @brief
bogdanm 0:9b334a45a8ff 318 * Get low frequency RC oscillator clock frequency for target system.
bogdanm 0:9b334a45a8ff 319 *
bogdanm 0:9b334a45a8ff 320 * @note
bogdanm 0:9b334a45a8ff 321 * This is an EFM32 proprietary function, not part of the CMSIS definition.
bogdanm 0:9b334a45a8ff 322 *
bogdanm 0:9b334a45a8ff 323 * @return
bogdanm 0:9b334a45a8ff 324 * LFRCO frequency in Hz.
bogdanm 0:9b334a45a8ff 325 *****************************************************************************/
bogdanm 0:9b334a45a8ff 326 uint32_t SystemLFRCOClockGet(void)
bogdanm 0:9b334a45a8ff 327 {
bogdanm 0:9b334a45a8ff 328 /* Currently we assume that this frequency is properly tuned during */
bogdanm 0:9b334a45a8ff 329 /* manufacturing and is not changed after reset. If future requirements */
bogdanm 0:9b334a45a8ff 330 /* for re-tuning by user, we can add support for that. */
bogdanm 0:9b334a45a8ff 331 return EFM32_LFRCO_FREQ;
bogdanm 0:9b334a45a8ff 332 }
bogdanm 0:9b334a45a8ff 333
bogdanm 0:9b334a45a8ff 334
bogdanm 0:9b334a45a8ff 335 /**************************************************************************//**
bogdanm 0:9b334a45a8ff 336 * @brief
bogdanm 0:9b334a45a8ff 337 * Get ultra low frequency RC oscillator clock frequency for target system.
bogdanm 0:9b334a45a8ff 338 *
bogdanm 0:9b334a45a8ff 339 * @note
bogdanm 0:9b334a45a8ff 340 * This is an EFM32 proprietary function, not part of the CMSIS definition.
bogdanm 0:9b334a45a8ff 341 *
bogdanm 0:9b334a45a8ff 342 * @return
bogdanm 0:9b334a45a8ff 343 * ULFRCO frequency in Hz.
bogdanm 0:9b334a45a8ff 344 *****************************************************************************/
bogdanm 0:9b334a45a8ff 345 uint32_t SystemULFRCOClockGet(void)
bogdanm 0:9b334a45a8ff 346 {
bogdanm 0:9b334a45a8ff 347 /* The ULFRCO frequency is not tuned, and can be very inaccurate */
bogdanm 0:9b334a45a8ff 348 return EFM32_ULFRCO_FREQ;
bogdanm 0:9b334a45a8ff 349 }
bogdanm 0:9b334a45a8ff 350
bogdanm 0:9b334a45a8ff 351
bogdanm 0:9b334a45a8ff 352 /**************************************************************************//**
bogdanm 0:9b334a45a8ff 353 * @brief
bogdanm 0:9b334a45a8ff 354 * Get low frequency crystal oscillator clock frequency for target system.
bogdanm 0:9b334a45a8ff 355 *
bogdanm 0:9b334a45a8ff 356 * @note
bogdanm 0:9b334a45a8ff 357 * This is an EFM32 proprietary function, not part of the CMSIS definition.
bogdanm 0:9b334a45a8ff 358 *
bogdanm 0:9b334a45a8ff 359 * @return
bogdanm 0:9b334a45a8ff 360 * LFXO frequency in Hz.
bogdanm 0:9b334a45a8ff 361 *****************************************************************************/
bogdanm 0:9b334a45a8ff 362 uint32_t SystemLFXOClockGet(void)
bogdanm 0:9b334a45a8ff 363 {
bogdanm 0:9b334a45a8ff 364 /* External crystal oscillator present? */
bogdanm 0:9b334a45a8ff 365 #if (EFM32_LFXO_FREQ > 0)
bogdanm 0:9b334a45a8ff 366 return SystemLFXOClock;
bogdanm 0:9b334a45a8ff 367 #else
bogdanm 0:9b334a45a8ff 368 return 0;
bogdanm 0:9b334a45a8ff 369 #endif
bogdanm 0:9b334a45a8ff 370 }
bogdanm 0:9b334a45a8ff 371
bogdanm 0:9b334a45a8ff 372
bogdanm 0:9b334a45a8ff 373 /**************************************************************************//**
bogdanm 0:9b334a45a8ff 374 * @brief
bogdanm 0:9b334a45a8ff 375 * Set low frequency crystal oscillator clock frequency for target system.
bogdanm 0:9b334a45a8ff 376 *
bogdanm 0:9b334a45a8ff 377 * @note
bogdanm 0:9b334a45a8ff 378 * This function is mainly provided for being able to handle target systems
bogdanm 0:9b334a45a8ff 379 * with different HF crystal oscillator frequencies run-time. If used, it
bogdanm 0:9b334a45a8ff 380 * should probably only be used once during system startup.
bogdanm 0:9b334a45a8ff 381 *
bogdanm 0:9b334a45a8ff 382 * @note
bogdanm 0:9b334a45a8ff 383 * This is an EFM32 proprietary function, not part of the CMSIS definition.
bogdanm 0:9b334a45a8ff 384 *
bogdanm 0:9b334a45a8ff 385 * @param[in] freq
bogdanm 0:9b334a45a8ff 386 * LFXO frequency in Hz used for target.
bogdanm 0:9b334a45a8ff 387 *****************************************************************************/
bogdanm 0:9b334a45a8ff 388 void SystemLFXOClockSet(uint32_t freq)
bogdanm 0:9b334a45a8ff 389 {
bogdanm 0:9b334a45a8ff 390 /* External crystal oscillator present? */
bogdanm 0:9b334a45a8ff 391 #if (EFM32_LFXO_FREQ > 0)
bogdanm 0:9b334a45a8ff 392 SystemLFXOClock = freq;
bogdanm 0:9b334a45a8ff 393
bogdanm 0:9b334a45a8ff 394 /* Update core clock frequency if LFXO is used to clock core */
bogdanm 0:9b334a45a8ff 395 if (CMU->STATUS & CMU_STATUS_LFXOSEL)
bogdanm 0:9b334a45a8ff 396 {
bogdanm 0:9b334a45a8ff 397 /* The function will update the global variable */
bogdanm 0:9b334a45a8ff 398 SystemCoreClockGet();
bogdanm 0:9b334a45a8ff 399 }
bogdanm 0:9b334a45a8ff 400 #else
bogdanm 0:9b334a45a8ff 401 (void)freq; /* Unused parameter */
bogdanm 0:9b334a45a8ff 402 #endif
bogdanm 0:9b334a45a8ff 403 }