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targets/TARGET_Silicon_Labs/TARGET_EFM32/TARGET_EFM32WG/device/system_efm32wg.c@153:9398a535854b, 2016-12-22 (annotated)
- Committer:
- fwndz
- Date:
- Thu Dec 22 05:12:40 2016 +0000
- Revision:
- 153:9398a535854b
- Parent:
- 150:02e0a0aed4ec
device target maximize
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
<> | 150:02e0a0aed4ec | 1 | /***************************************************************************//** |
<> | 150:02e0a0aed4ec | 2 | * @file system_efm32wg.c |
<> | 150:02e0a0aed4ec | 3 | * @brief CMSIS Cortex-M4 System Layer for EFM32WG devices. |
<> | 150:02e0a0aed4ec | 4 | * @version 5.0.0 |
<> | 150:02e0a0aed4ec | 5 | ****************************************************************************** |
<> | 150:02e0a0aed4ec | 6 | * @section License |
<> | 150:02e0a0aed4ec | 7 | * <b>Copyright 2016 Silicon Laboratories, Inc. http://www.silabs.com</b> |
<> | 150:02e0a0aed4ec | 8 | ****************************************************************************** |
<> | 150:02e0a0aed4ec | 9 | * |
<> | 150:02e0a0aed4ec | 10 | * Permission is granted to anyone to use this software for any purpose, |
<> | 150:02e0a0aed4ec | 11 | * including commercial applications, and to alter it and redistribute it |
<> | 150:02e0a0aed4ec | 12 | * freely, subject to the following restrictions: |
<> | 150:02e0a0aed4ec | 13 | * |
<> | 150:02e0a0aed4ec | 14 | * 1. The origin of this software must not be misrepresented; you must not |
<> | 150:02e0a0aed4ec | 15 | * claim that you wrote the original software.@n |
<> | 150:02e0a0aed4ec | 16 | * 2. Altered source versions must be plainly marked as such, and must not be |
<> | 150:02e0a0aed4ec | 17 | * misrepresented as being the original software.@n |
<> | 150:02e0a0aed4ec | 18 | * 3. This notice may not be removed or altered from any source distribution. |
<> | 150:02e0a0aed4ec | 19 | * |
<> | 150:02e0a0aed4ec | 20 | * DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Silicon Laboratories, Inc. |
<> | 150:02e0a0aed4ec | 21 | * has no obligation to support this Software. Silicon Laboratories, Inc. is |
<> | 150:02e0a0aed4ec | 22 | * providing the Software "AS IS", with no express or implied warranties of any |
<> | 150:02e0a0aed4ec | 23 | * kind, including, but not limited to, any implied warranties of |
<> | 150:02e0a0aed4ec | 24 | * merchantability or fitness for any particular purpose or warranties against |
<> | 150:02e0a0aed4ec | 25 | * infringement of any proprietary rights of a third party. |
<> | 150:02e0a0aed4ec | 26 | * |
<> | 150:02e0a0aed4ec | 27 | * Silicon Laboratories, Inc. will not be liable for any consequential, |
<> | 150:02e0a0aed4ec | 28 | * incidental, or special damages, or any other relief, or for any claim by |
<> | 150:02e0a0aed4ec | 29 | * any third party, arising from your use of this Software. |
<> | 150:02e0a0aed4ec | 30 | * |
<> | 150:02e0a0aed4ec | 31 | *****************************************************************************/ |
<> | 150:02e0a0aed4ec | 32 | |
<> | 150:02e0a0aed4ec | 33 | #include <stdint.h> |
<> | 150:02e0a0aed4ec | 34 | #include "em_device.h" |
<> | 150:02e0a0aed4ec | 35 | |
<> | 150:02e0a0aed4ec | 36 | /******************************************************************************* |
<> | 150:02e0a0aed4ec | 37 | ****************************** DEFINES ************************************ |
<> | 150:02e0a0aed4ec | 38 | ******************************************************************************/ |
<> | 150:02e0a0aed4ec | 39 | |
<> | 150:02e0a0aed4ec | 40 | /** LFRCO frequency, tuned to below frequency during manufacturing. */ |
<> | 150:02e0a0aed4ec | 41 | #define EFM32_LFRCO_FREQ (32768UL) |
<> | 150:02e0a0aed4ec | 42 | #define EFM32_ULFRCO_FREQ (1000UL) |
<> | 150:02e0a0aed4ec | 43 | |
<> | 150:02e0a0aed4ec | 44 | /******************************************************************************* |
<> | 150:02e0a0aed4ec | 45 | ************************** LOCAL VARIABLES ******************************** |
<> | 150:02e0a0aed4ec | 46 | ******************************************************************************/ |
<> | 150:02e0a0aed4ec | 47 | |
<> | 150:02e0a0aed4ec | 48 | /* System oscillator frequencies. These frequencies are normally constant */ |
<> | 150:02e0a0aed4ec | 49 | /* for a target, but they are made configurable in order to allow run-time */ |
<> | 150:02e0a0aed4ec | 50 | /* handling of different boards. The crystal oscillator clocks can be set */ |
<> | 150:02e0a0aed4ec | 51 | /* compile time to a non-default value by defining respective EFM32_nFXO_FREQ */ |
<> | 150:02e0a0aed4ec | 52 | /* values according to board design. By defining the EFM32_nFXO_FREQ to 0, */ |
<> | 150:02e0a0aed4ec | 53 | /* one indicates that the oscillator is not present, in order to save some */ |
<> | 150:02e0a0aed4ec | 54 | /* SW footprint. */ |
<> | 150:02e0a0aed4ec | 55 | |
<> | 150:02e0a0aed4ec | 56 | #ifndef EFM32_HFXO_FREQ |
<> | 150:02e0a0aed4ec | 57 | #define EFM32_HFXO_FREQ (48000000UL) |
<> | 150:02e0a0aed4ec | 58 | #endif |
<> | 150:02e0a0aed4ec | 59 | |
<> | 150:02e0a0aed4ec | 60 | #define EFM32_HFRCO_MAX_FREQ (28000000UL) |
<> | 150:02e0a0aed4ec | 61 | |
<> | 150:02e0a0aed4ec | 62 | /* Do not define variable if HF crystal oscillator not present */ |
<> | 150:02e0a0aed4ec | 63 | #if (EFM32_HFXO_FREQ > 0) |
<> | 150:02e0a0aed4ec | 64 | /** @cond DO_NOT_INCLUDE_WITH_DOXYGEN */ |
<> | 150:02e0a0aed4ec | 65 | /** System HFXO clock. */ |
<> | 150:02e0a0aed4ec | 66 | static uint32_t SystemHFXOClock = EFM32_HFXO_FREQ; |
<> | 150:02e0a0aed4ec | 67 | /** @endcond (DO_NOT_INCLUDE_WITH_DOXYGEN) */ |
<> | 150:02e0a0aed4ec | 68 | #endif |
<> | 150:02e0a0aed4ec | 69 | |
<> | 150:02e0a0aed4ec | 70 | #ifndef EFM32_LFXO_FREQ |
<> | 150:02e0a0aed4ec | 71 | #define EFM32_LFXO_FREQ (EFM32_LFRCO_FREQ) |
<> | 150:02e0a0aed4ec | 72 | #endif |
<> | 150:02e0a0aed4ec | 73 | |
<> | 150:02e0a0aed4ec | 74 | /* Do not define variable if LF crystal oscillator not present */ |
<> | 150:02e0a0aed4ec | 75 | #if (EFM32_LFXO_FREQ > 0) |
<> | 150:02e0a0aed4ec | 76 | /** @cond DO_NOT_INCLUDE_WITH_DOXYGEN */ |
<> | 150:02e0a0aed4ec | 77 | /** System LFXO clock. */ |
<> | 150:02e0a0aed4ec | 78 | static uint32_t SystemLFXOClock = EFM32_LFXO_FREQ; |
<> | 150:02e0a0aed4ec | 79 | /** @endcond (DO_NOT_INCLUDE_WITH_DOXYGEN) */ |
<> | 150:02e0a0aed4ec | 80 | #endif |
<> | 150:02e0a0aed4ec | 81 | |
<> | 150:02e0a0aed4ec | 82 | /* Inline function to get the chip's Production Revision. */ |
<> | 150:02e0a0aed4ec | 83 | __STATIC_INLINE uint8_t GetProdRev(void) |
<> | 150:02e0a0aed4ec | 84 | { |
<> | 150:02e0a0aed4ec | 85 | return ((DEVINFO->PART & _DEVINFO_PART_PROD_REV_MASK) |
<> | 150:02e0a0aed4ec | 86 | >> _DEVINFO_PART_PROD_REV_SHIFT); |
<> | 150:02e0a0aed4ec | 87 | } |
<> | 150:02e0a0aed4ec | 88 | |
<> | 150:02e0a0aed4ec | 89 | /******************************************************************************* |
<> | 150:02e0a0aed4ec | 90 | ************************** GLOBAL VARIABLES ******************************* |
<> | 150:02e0a0aed4ec | 91 | ******************************************************************************/ |
<> | 150:02e0a0aed4ec | 92 | |
<> | 150:02e0a0aed4ec | 93 | /** |
<> | 150:02e0a0aed4ec | 94 | * @brief |
<> | 150:02e0a0aed4ec | 95 | * System System Clock Frequency (Core Clock). |
<> | 150:02e0a0aed4ec | 96 | * |
<> | 150:02e0a0aed4ec | 97 | * @details |
<> | 150:02e0a0aed4ec | 98 | * Required CMSIS global variable that must be kept up-to-date. |
<> | 150:02e0a0aed4ec | 99 | */ |
<> | 150:02e0a0aed4ec | 100 | uint32_t SystemCoreClock; |
<> | 150:02e0a0aed4ec | 101 | |
<> | 150:02e0a0aed4ec | 102 | /******************************************************************************* |
<> | 150:02e0a0aed4ec | 103 | ************************** GLOBAL FUNCTIONS ******************************* |
<> | 150:02e0a0aed4ec | 104 | ******************************************************************************/ |
<> | 150:02e0a0aed4ec | 105 | |
<> | 150:02e0a0aed4ec | 106 | /***************************************************************************//** |
<> | 150:02e0a0aed4ec | 107 | * @brief |
<> | 150:02e0a0aed4ec | 108 | * Get the current core clock frequency. |
<> | 150:02e0a0aed4ec | 109 | * |
<> | 150:02e0a0aed4ec | 110 | * @details |
<> | 150:02e0a0aed4ec | 111 | * Calculate and get the current core clock frequency based on the current |
<> | 150:02e0a0aed4ec | 112 | * configuration. Assuming that the SystemCoreClock global variable is |
<> | 150:02e0a0aed4ec | 113 | * maintained, the core clock frequency is stored in that variable as well. |
<> | 150:02e0a0aed4ec | 114 | * This function will however calculate the core clock based on actual HW |
<> | 150:02e0a0aed4ec | 115 | * configuration. It will also update the SystemCoreClock global variable. |
<> | 150:02e0a0aed4ec | 116 | * |
<> | 150:02e0a0aed4ec | 117 | * @note |
<> | 150:02e0a0aed4ec | 118 | * This is an EFM32 proprietary function, not part of the CMSIS definition. |
<> | 150:02e0a0aed4ec | 119 | * |
<> | 150:02e0a0aed4ec | 120 | * @return |
<> | 150:02e0a0aed4ec | 121 | * The current core clock frequency in Hz. |
<> | 150:02e0a0aed4ec | 122 | ******************************************************************************/ |
<> | 150:02e0a0aed4ec | 123 | uint32_t SystemCoreClockGet(void) |
<> | 150:02e0a0aed4ec | 124 | { |
<> | 150:02e0a0aed4ec | 125 | uint32_t ret; |
<> | 150:02e0a0aed4ec | 126 | |
<> | 150:02e0a0aed4ec | 127 | ret = SystemHFClockGet(); |
<> | 150:02e0a0aed4ec | 128 | ret >>= (CMU->HFCORECLKDIV & _CMU_HFCORECLKDIV_HFCORECLKDIV_MASK) >> |
<> | 150:02e0a0aed4ec | 129 | _CMU_HFCORECLKDIV_HFCORECLKDIV_SHIFT; |
<> | 150:02e0a0aed4ec | 130 | |
<> | 150:02e0a0aed4ec | 131 | /* Keep CMSIS variable up-to-date just in case */ |
<> | 150:02e0a0aed4ec | 132 | SystemCoreClock = ret; |
<> | 150:02e0a0aed4ec | 133 | |
<> | 150:02e0a0aed4ec | 134 | return ret; |
<> | 150:02e0a0aed4ec | 135 | } |
<> | 150:02e0a0aed4ec | 136 | |
<> | 150:02e0a0aed4ec | 137 | |
<> | 150:02e0a0aed4ec | 138 | /***************************************************************************//** |
<> | 150:02e0a0aed4ec | 139 | * @brief |
<> | 150:02e0a0aed4ec | 140 | * Get the maximum core clock frequency. |
<> | 150:02e0a0aed4ec | 141 | * |
<> | 150:02e0a0aed4ec | 142 | * @note |
<> | 150:02e0a0aed4ec | 143 | * This is an EFR32 proprietary function, not part of the CMSIS definition. |
<> | 150:02e0a0aed4ec | 144 | * |
<> | 150:02e0a0aed4ec | 145 | * @return |
<> | 150:02e0a0aed4ec | 146 | * The maximum core clock frequency in Hz. |
<> | 150:02e0a0aed4ec | 147 | ******************************************************************************/ |
<> | 150:02e0a0aed4ec | 148 | uint32_t SystemMaxCoreClockGet(void) |
<> | 150:02e0a0aed4ec | 149 | { |
<> | 150:02e0a0aed4ec | 150 | return (EFM32_HFRCO_MAX_FREQ > EFM32_HFXO_FREQ ? \ |
<> | 150:02e0a0aed4ec | 151 | EFM32_HFRCO_MAX_FREQ : EFM32_HFXO_FREQ); |
<> | 150:02e0a0aed4ec | 152 | } |
<> | 150:02e0a0aed4ec | 153 | |
<> | 150:02e0a0aed4ec | 154 | |
<> | 150:02e0a0aed4ec | 155 | /***************************************************************************//** |
<> | 150:02e0a0aed4ec | 156 | * @brief |
<> | 150:02e0a0aed4ec | 157 | * Get the current HFCLK frequency. |
<> | 150:02e0a0aed4ec | 158 | * |
<> | 150:02e0a0aed4ec | 159 | * @note |
<> | 150:02e0a0aed4ec | 160 | * This is an EFM32 proprietary function, not part of the CMSIS definition. |
<> | 150:02e0a0aed4ec | 161 | * |
<> | 150:02e0a0aed4ec | 162 | * @return |
<> | 150:02e0a0aed4ec | 163 | * The current HFCLK frequency in Hz. |
<> | 150:02e0a0aed4ec | 164 | ******************************************************************************/ |
<> | 150:02e0a0aed4ec | 165 | uint32_t SystemHFClockGet(void) |
<> | 150:02e0a0aed4ec | 166 | { |
<> | 150:02e0a0aed4ec | 167 | uint32_t ret; |
<> | 150:02e0a0aed4ec | 168 | |
<> | 150:02e0a0aed4ec | 169 | switch (CMU->STATUS & (CMU_STATUS_HFRCOSEL | CMU_STATUS_HFXOSEL | |
<> | 150:02e0a0aed4ec | 170 | CMU_STATUS_LFRCOSEL | CMU_STATUS_LFXOSEL)) |
<> | 150:02e0a0aed4ec | 171 | { |
<> | 150:02e0a0aed4ec | 172 | case CMU_STATUS_LFXOSEL: |
<> | 150:02e0a0aed4ec | 173 | #if (EFM32_LFXO_FREQ > 0) |
<> | 150:02e0a0aed4ec | 174 | ret = SystemLFXOClock; |
<> | 150:02e0a0aed4ec | 175 | #else |
<> | 150:02e0a0aed4ec | 176 | /* We should not get here, since core should not be clocked. May */ |
<> | 150:02e0a0aed4ec | 177 | /* be caused by a misconfiguration though. */ |
<> | 150:02e0a0aed4ec | 178 | ret = 0; |
<> | 150:02e0a0aed4ec | 179 | #endif |
<> | 150:02e0a0aed4ec | 180 | break; |
<> | 150:02e0a0aed4ec | 181 | |
<> | 150:02e0a0aed4ec | 182 | case CMU_STATUS_LFRCOSEL: |
<> | 150:02e0a0aed4ec | 183 | ret = EFM32_LFRCO_FREQ; |
<> | 150:02e0a0aed4ec | 184 | break; |
<> | 150:02e0a0aed4ec | 185 | |
<> | 150:02e0a0aed4ec | 186 | case CMU_STATUS_HFXOSEL: |
<> | 150:02e0a0aed4ec | 187 | #if (EFM32_HFXO_FREQ > 0) |
<> | 150:02e0a0aed4ec | 188 | ret = SystemHFXOClock; |
<> | 150:02e0a0aed4ec | 189 | #else |
<> | 150:02e0a0aed4ec | 190 | /* We should not get here, since core should not be clocked. May */ |
<> | 150:02e0a0aed4ec | 191 | /* be caused by a misconfiguration though. */ |
<> | 150:02e0a0aed4ec | 192 | ret = 0; |
<> | 150:02e0a0aed4ec | 193 | #endif |
<> | 150:02e0a0aed4ec | 194 | break; |
<> | 150:02e0a0aed4ec | 195 | |
<> | 150:02e0a0aed4ec | 196 | default: /* CMU_STATUS_HFRCOSEL */ |
<> | 150:02e0a0aed4ec | 197 | switch (CMU->HFRCOCTRL & _CMU_HFRCOCTRL_BAND_MASK) |
<> | 150:02e0a0aed4ec | 198 | { |
<> | 150:02e0a0aed4ec | 199 | case CMU_HFRCOCTRL_BAND_28MHZ: |
<> | 150:02e0a0aed4ec | 200 | ret = 28000000; |
<> | 150:02e0a0aed4ec | 201 | break; |
<> | 150:02e0a0aed4ec | 202 | |
<> | 150:02e0a0aed4ec | 203 | case CMU_HFRCOCTRL_BAND_21MHZ: |
<> | 150:02e0a0aed4ec | 204 | ret = 21000000; |
<> | 150:02e0a0aed4ec | 205 | break; |
<> | 150:02e0a0aed4ec | 206 | |
<> | 150:02e0a0aed4ec | 207 | case CMU_HFRCOCTRL_BAND_14MHZ: |
<> | 150:02e0a0aed4ec | 208 | ret = 14000000; |
<> | 150:02e0a0aed4ec | 209 | break; |
<> | 150:02e0a0aed4ec | 210 | |
<> | 150:02e0a0aed4ec | 211 | case CMU_HFRCOCTRL_BAND_11MHZ: |
<> | 150:02e0a0aed4ec | 212 | ret = 11000000; |
<> | 150:02e0a0aed4ec | 213 | break; |
<> | 150:02e0a0aed4ec | 214 | |
<> | 150:02e0a0aed4ec | 215 | case CMU_HFRCOCTRL_BAND_7MHZ: |
<> | 150:02e0a0aed4ec | 216 | if ( GetProdRev() >= 19 ) |
<> | 150:02e0a0aed4ec | 217 | ret = 6600000; |
<> | 150:02e0a0aed4ec | 218 | else |
<> | 150:02e0a0aed4ec | 219 | ret = 7000000; |
<> | 150:02e0a0aed4ec | 220 | break; |
<> | 150:02e0a0aed4ec | 221 | |
<> | 150:02e0a0aed4ec | 222 | case CMU_HFRCOCTRL_BAND_1MHZ: |
<> | 150:02e0a0aed4ec | 223 | if ( GetProdRev() >= 19 ) |
<> | 150:02e0a0aed4ec | 224 | ret = 1200000; |
<> | 150:02e0a0aed4ec | 225 | else |
<> | 150:02e0a0aed4ec | 226 | ret = 1000000; |
<> | 150:02e0a0aed4ec | 227 | break; |
<> | 150:02e0a0aed4ec | 228 | |
<> | 150:02e0a0aed4ec | 229 | default: |
<> | 150:02e0a0aed4ec | 230 | ret = 0; |
<> | 150:02e0a0aed4ec | 231 | break; |
<> | 150:02e0a0aed4ec | 232 | } |
<> | 150:02e0a0aed4ec | 233 | break; |
<> | 150:02e0a0aed4ec | 234 | } |
<> | 150:02e0a0aed4ec | 235 | |
<> | 150:02e0a0aed4ec | 236 | return ret / (1U + ((CMU->CTRL & _CMU_CTRL_HFCLKDIV_MASK) |
<> | 150:02e0a0aed4ec | 237 | >> _CMU_CTRL_HFCLKDIV_SHIFT)); |
<> | 150:02e0a0aed4ec | 238 | } |
<> | 150:02e0a0aed4ec | 239 | |
<> | 150:02e0a0aed4ec | 240 | |
<> | 150:02e0a0aed4ec | 241 | /**************************************************************************//** |
<> | 150:02e0a0aed4ec | 242 | * @brief |
<> | 150:02e0a0aed4ec | 243 | * Get high frequency crystal oscillator clock frequency for target system. |
<> | 150:02e0a0aed4ec | 244 | * |
<> | 150:02e0a0aed4ec | 245 | * @note |
<> | 150:02e0a0aed4ec | 246 | * This is an EFM32 proprietary function, not part of the CMSIS definition. |
<> | 150:02e0a0aed4ec | 247 | * |
<> | 150:02e0a0aed4ec | 248 | * @return |
<> | 150:02e0a0aed4ec | 249 | * HFXO frequency in Hz. |
<> | 150:02e0a0aed4ec | 250 | *****************************************************************************/ |
<> | 150:02e0a0aed4ec | 251 | uint32_t SystemHFXOClockGet(void) |
<> | 150:02e0a0aed4ec | 252 | { |
<> | 150:02e0a0aed4ec | 253 | /* External crystal oscillator present? */ |
<> | 150:02e0a0aed4ec | 254 | #if (EFM32_HFXO_FREQ > 0) |
<> | 150:02e0a0aed4ec | 255 | return SystemHFXOClock; |
<> | 150:02e0a0aed4ec | 256 | #else |
<> | 150:02e0a0aed4ec | 257 | return 0; |
<> | 150:02e0a0aed4ec | 258 | #endif |
<> | 150:02e0a0aed4ec | 259 | } |
<> | 150:02e0a0aed4ec | 260 | |
<> | 150:02e0a0aed4ec | 261 | |
<> | 150:02e0a0aed4ec | 262 | /**************************************************************************//** |
<> | 150:02e0a0aed4ec | 263 | * @brief |
<> | 150:02e0a0aed4ec | 264 | * Set high frequency crystal oscillator clock frequency for target system. |
<> | 150:02e0a0aed4ec | 265 | * |
<> | 150:02e0a0aed4ec | 266 | * @note |
<> | 150:02e0a0aed4ec | 267 | * This function is mainly provided for being able to handle target systems |
<> | 150:02e0a0aed4ec | 268 | * with different HF crystal oscillator frequencies run-time. If used, it |
<> | 150:02e0a0aed4ec | 269 | * should probably only be used once during system startup. |
<> | 150:02e0a0aed4ec | 270 | * |
<> | 150:02e0a0aed4ec | 271 | * @note |
<> | 150:02e0a0aed4ec | 272 | * This is an EFM32 proprietary function, not part of the CMSIS definition. |
<> | 150:02e0a0aed4ec | 273 | * |
<> | 150:02e0a0aed4ec | 274 | * @param[in] freq |
<> | 150:02e0a0aed4ec | 275 | * HFXO frequency in Hz used for target. |
<> | 150:02e0a0aed4ec | 276 | *****************************************************************************/ |
<> | 150:02e0a0aed4ec | 277 | void SystemHFXOClockSet(uint32_t freq) |
<> | 150:02e0a0aed4ec | 278 | { |
<> | 150:02e0a0aed4ec | 279 | /* External crystal oscillator present? */ |
<> | 150:02e0a0aed4ec | 280 | #if (EFM32_HFXO_FREQ > 0) |
<> | 150:02e0a0aed4ec | 281 | SystemHFXOClock = freq; |
<> | 150:02e0a0aed4ec | 282 | |
<> | 150:02e0a0aed4ec | 283 | /* Update core clock frequency if HFXO is used to clock core */ |
<> | 150:02e0a0aed4ec | 284 | if (CMU->STATUS & CMU_STATUS_HFXOSEL) |
<> | 150:02e0a0aed4ec | 285 | { |
<> | 150:02e0a0aed4ec | 286 | /* The function will update the global variable */ |
<> | 150:02e0a0aed4ec | 287 | SystemCoreClockGet(); |
<> | 150:02e0a0aed4ec | 288 | } |
<> | 150:02e0a0aed4ec | 289 | #else |
<> | 150:02e0a0aed4ec | 290 | (void)freq; /* Unused parameter */ |
<> | 150:02e0a0aed4ec | 291 | #endif |
<> | 150:02e0a0aed4ec | 292 | } |
<> | 150:02e0a0aed4ec | 293 | |
<> | 150:02e0a0aed4ec | 294 | |
<> | 150:02e0a0aed4ec | 295 | /**************************************************************************//** |
<> | 150:02e0a0aed4ec | 296 | * @brief |
<> | 150:02e0a0aed4ec | 297 | * Initialize the system. |
<> | 150:02e0a0aed4ec | 298 | * |
<> | 150:02e0a0aed4ec | 299 | * @details |
<> | 150:02e0a0aed4ec | 300 | * Do required generic HW system init. |
<> | 150:02e0a0aed4ec | 301 | * |
<> | 150:02e0a0aed4ec | 302 | * @note |
<> | 150:02e0a0aed4ec | 303 | * This function is invoked during system init, before the main() routine |
<> | 150:02e0a0aed4ec | 304 | * and any data has been initialized. For this reason, it cannot do any |
<> | 150:02e0a0aed4ec | 305 | * initialization of variables etc. |
<> | 150:02e0a0aed4ec | 306 | *****************************************************************************/ |
<> | 150:02e0a0aed4ec | 307 | void SystemInit(void) |
<> | 150:02e0a0aed4ec | 308 | { |
<> | 150:02e0a0aed4ec | 309 | #if (__FPU_PRESENT == 1) && (__FPU_USED == 1) |
<> | 150:02e0a0aed4ec | 310 | /* Set floating point coprosessor access mode. */ |
<> | 150:02e0a0aed4ec | 311 | SCB->CPACR |= ((3UL << 10*2) | /* set CP10 Full Access */ |
<> | 150:02e0a0aed4ec | 312 | (3UL << 11*2) ); /* set CP11 Full Access */ |
<> | 150:02e0a0aed4ec | 313 | #endif |
<> | 150:02e0a0aed4ec | 314 | } |
<> | 150:02e0a0aed4ec | 315 | |
<> | 150:02e0a0aed4ec | 316 | |
<> | 150:02e0a0aed4ec | 317 | /**************************************************************************//** |
<> | 150:02e0a0aed4ec | 318 | * @brief |
<> | 150:02e0a0aed4ec | 319 | * Get low frequency RC oscillator clock frequency for target system. |
<> | 150:02e0a0aed4ec | 320 | * |
<> | 150:02e0a0aed4ec | 321 | * @note |
<> | 150:02e0a0aed4ec | 322 | * This is an EFM32 proprietary function, not part of the CMSIS definition. |
<> | 150:02e0a0aed4ec | 323 | * |
<> | 150:02e0a0aed4ec | 324 | * @return |
<> | 150:02e0a0aed4ec | 325 | * LFRCO frequency in Hz. |
<> | 150:02e0a0aed4ec | 326 | *****************************************************************************/ |
<> | 150:02e0a0aed4ec | 327 | uint32_t SystemLFRCOClockGet(void) |
<> | 150:02e0a0aed4ec | 328 | { |
<> | 150:02e0a0aed4ec | 329 | /* Currently we assume that this frequency is properly tuned during */ |
<> | 150:02e0a0aed4ec | 330 | /* manufacturing and is not changed after reset. If future requirements */ |
<> | 150:02e0a0aed4ec | 331 | /* for re-tuning by user, we can add support for that. */ |
<> | 150:02e0a0aed4ec | 332 | return EFM32_LFRCO_FREQ; |
<> | 150:02e0a0aed4ec | 333 | } |
<> | 150:02e0a0aed4ec | 334 | |
<> | 150:02e0a0aed4ec | 335 | |
<> | 150:02e0a0aed4ec | 336 | /**************************************************************************//** |
<> | 150:02e0a0aed4ec | 337 | * @brief |
<> | 150:02e0a0aed4ec | 338 | * Get ultra low frequency RC oscillator clock frequency for target system. |
<> | 150:02e0a0aed4ec | 339 | * |
<> | 150:02e0a0aed4ec | 340 | * @note |
<> | 150:02e0a0aed4ec | 341 | * This is an EFM32 proprietary function, not part of the CMSIS definition. |
<> | 150:02e0a0aed4ec | 342 | * |
<> | 150:02e0a0aed4ec | 343 | * @return |
<> | 150:02e0a0aed4ec | 344 | * ULFRCO frequency in Hz. |
<> | 150:02e0a0aed4ec | 345 | *****************************************************************************/ |
<> | 150:02e0a0aed4ec | 346 | uint32_t SystemULFRCOClockGet(void) |
<> | 150:02e0a0aed4ec | 347 | { |
<> | 150:02e0a0aed4ec | 348 | /* The ULFRCO frequency is not tuned, and can be very inaccurate */ |
<> | 150:02e0a0aed4ec | 349 | return EFM32_ULFRCO_FREQ; |
<> | 150:02e0a0aed4ec | 350 | } |
<> | 150:02e0a0aed4ec | 351 | |
<> | 150:02e0a0aed4ec | 352 | |
<> | 150:02e0a0aed4ec | 353 | /**************************************************************************//** |
<> | 150:02e0a0aed4ec | 354 | * @brief |
<> | 150:02e0a0aed4ec | 355 | * Get low frequency crystal oscillator clock frequency for target system. |
<> | 150:02e0a0aed4ec | 356 | * |
<> | 150:02e0a0aed4ec | 357 | * @note |
<> | 150:02e0a0aed4ec | 358 | * This is an EFM32 proprietary function, not part of the CMSIS definition. |
<> | 150:02e0a0aed4ec | 359 | * |
<> | 150:02e0a0aed4ec | 360 | * @return |
<> | 150:02e0a0aed4ec | 361 | * LFXO frequency in Hz. |
<> | 150:02e0a0aed4ec | 362 | *****************************************************************************/ |
<> | 150:02e0a0aed4ec | 363 | uint32_t SystemLFXOClockGet(void) |
<> | 150:02e0a0aed4ec | 364 | { |
<> | 150:02e0a0aed4ec | 365 | /* External crystal oscillator present? */ |
<> | 150:02e0a0aed4ec | 366 | #if (EFM32_LFXO_FREQ > 0) |
<> | 150:02e0a0aed4ec | 367 | return SystemLFXOClock; |
<> | 150:02e0a0aed4ec | 368 | #else |
<> | 150:02e0a0aed4ec | 369 | return 0; |
<> | 150:02e0a0aed4ec | 370 | #endif |
<> | 150:02e0a0aed4ec | 371 | } |
<> | 150:02e0a0aed4ec | 372 | |
<> | 150:02e0a0aed4ec | 373 | |
<> | 150:02e0a0aed4ec | 374 | /**************************************************************************//** |
<> | 150:02e0a0aed4ec | 375 | * @brief |
<> | 150:02e0a0aed4ec | 376 | * Set low frequency crystal oscillator clock frequency for target system. |
<> | 150:02e0a0aed4ec | 377 | * |
<> | 150:02e0a0aed4ec | 378 | * @note |
<> | 150:02e0a0aed4ec | 379 | * This function is mainly provided for being able to handle target systems |
<> | 150:02e0a0aed4ec | 380 | * with different HF crystal oscillator frequencies run-time. If used, it |
<> | 150:02e0a0aed4ec | 381 | * should probably only be used once during system startup. |
<> | 150:02e0a0aed4ec | 382 | * |
<> | 150:02e0a0aed4ec | 383 | * @note |
<> | 150:02e0a0aed4ec | 384 | * This is an EFM32 proprietary function, not part of the CMSIS definition. |
<> | 150:02e0a0aed4ec | 385 | * |
<> | 150:02e0a0aed4ec | 386 | * @param[in] freq |
<> | 150:02e0a0aed4ec | 387 | * LFXO frequency in Hz used for target. |
<> | 150:02e0a0aed4ec | 388 | *****************************************************************************/ |
<> | 150:02e0a0aed4ec | 389 | void SystemLFXOClockSet(uint32_t freq) |
<> | 150:02e0a0aed4ec | 390 | { |
<> | 150:02e0a0aed4ec | 391 | /* External crystal oscillator present? */ |
<> | 150:02e0a0aed4ec | 392 | #if (EFM32_LFXO_FREQ > 0) |
<> | 150:02e0a0aed4ec | 393 | SystemLFXOClock = freq; |
<> | 150:02e0a0aed4ec | 394 | |
<> | 150:02e0a0aed4ec | 395 | /* Update core clock frequency if LFXO is used to clock core */ |
<> | 150:02e0a0aed4ec | 396 | if (CMU->STATUS & CMU_STATUS_LFXOSEL) |
<> | 150:02e0a0aed4ec | 397 | { |
<> | 150:02e0a0aed4ec | 398 | /* The function will update the global variable */ |
<> | 150:02e0a0aed4ec | 399 | SystemCoreClockGet(); |
<> | 150:02e0a0aed4ec | 400 | } |
<> | 150:02e0a0aed4ec | 401 | #else |
<> | 150:02e0a0aed4ec | 402 | (void)freq; /* Unused parameter */ |
<> | 150:02e0a0aed4ec | 403 | #endif |
<> | 150:02e0a0aed4ec | 404 | } |