Aravind Vadali
/
mbed-src-RatRacerAV
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mbed official
targets/cmsis/TARGET_Silicon_Labs/TARGET_EFM32/TARGET_EFM32HG_STK3400/system_efm32hg.c@525:c320967f86b9, 2015-04-28 (annotated)
- Committer:
- mbed_official
- Date:
- Tue Apr 28 11:45:12 2015 +0100
- Revision:
- 525:c320967f86b9
Synchronized with git revision 299385b8331142b9dc524da7a986536f60b14553
Full URL: https://github.com/mbedmicro/mbed/commit/299385b8331142b9dc524da7a986536f60b14553/
Add in Silicon Labs targets with asynchronous API support
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| mbed_official | 525:c320967f86b9 | 1 | /***************************************************************************//** |
| mbed_official | 525:c320967f86b9 | 2 | * @file system_efm32hg.c |
| mbed_official | 525:c320967f86b9 | 3 | * @brief CMSIS Cortex-M0+ System Layer for EFM32HG devices. |
| mbed_official | 525:c320967f86b9 | 4 | * @version 3.20.12 |
| mbed_official | 525:c320967f86b9 | 5 | ****************************************************************************** |
| mbed_official | 525:c320967f86b9 | 6 | * @section License |
| mbed_official | 525:c320967f86b9 | 7 | * <b>(C) Copyright 2015 Silicon Laboratories, Inc. http://www.silabs.com</b> |
| mbed_official | 525:c320967f86b9 | 8 | ****************************************************************************** |
| mbed_official | 525:c320967f86b9 | 9 | * |
| mbed_official | 525:c320967f86b9 | 10 | * Permission is granted to anyone to use this software for any purpose, |
| mbed_official | 525:c320967f86b9 | 11 | * including commercial applications, and to alter it and redistribute it |
| mbed_official | 525:c320967f86b9 | 12 | * freely, subject to the following restrictions: |
| mbed_official | 525:c320967f86b9 | 13 | * |
| mbed_official | 525:c320967f86b9 | 14 | * 1. The origin of this software must not be misrepresented; you must not |
| mbed_official | 525:c320967f86b9 | 15 | * claim that you wrote the original software.@n |
| mbed_official | 525:c320967f86b9 | 16 | * 2. Altered source versions must be plainly marked as such, and must not be |
| mbed_official | 525:c320967f86b9 | 17 | * misrepresented as being the original software.@n |
| mbed_official | 525:c320967f86b9 | 18 | * 3. This notice may not be removed or altered from any source distribution. |
| mbed_official | 525:c320967f86b9 | 19 | * |
| mbed_official | 525:c320967f86b9 | 20 | * DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Silicon Laboratories, Inc. |
| mbed_official | 525:c320967f86b9 | 21 | * has no obligation to support this Software. Silicon Laboratories, Inc. is |
| mbed_official | 525:c320967f86b9 | 22 | * providing the Software "AS IS", with no express or implied warranties of any |
| mbed_official | 525:c320967f86b9 | 23 | * kind, including, but not limited to, any implied warranties of |
| mbed_official | 525:c320967f86b9 | 24 | * merchantability or fitness for any particular purpose or warranties against |
| mbed_official | 525:c320967f86b9 | 25 | * infringement of any proprietary rights of a third party. |
| mbed_official | 525:c320967f86b9 | 26 | * |
| mbed_official | 525:c320967f86b9 | 27 | * Silicon Laboratories, Inc. will not be liable for any consequential, |
| mbed_official | 525:c320967f86b9 | 28 | * incidental, or special damages, or any other relief, or for any claim by |
| mbed_official | 525:c320967f86b9 | 29 | * any third party, arising from your use of this Software. |
| mbed_official | 525:c320967f86b9 | 30 | * |
| mbed_official | 525:c320967f86b9 | 31 | *****************************************************************************/ |
| mbed_official | 525:c320967f86b9 | 32 | |
| mbed_official | 525:c320967f86b9 | 33 | #include <stdint.h> |
| mbed_official | 525:c320967f86b9 | 34 | #include "em_device.h" |
| mbed_official | 525:c320967f86b9 | 35 | |
| mbed_official | 525:c320967f86b9 | 36 | /******************************************************************************* |
| mbed_official | 525:c320967f86b9 | 37 | ****************************** DEFINES ************************************ |
| mbed_official | 525:c320967f86b9 | 38 | ******************************************************************************/ |
| mbed_official | 525:c320967f86b9 | 39 | |
| mbed_official | 525:c320967f86b9 | 40 | /** LFRCO frequency, tuned to below frequency during manufacturing. */ |
| mbed_official | 525:c320967f86b9 | 41 | #define EFM32_LFRCO_FREQ (32768UL) |
| mbed_official | 525:c320967f86b9 | 42 | #define EFM32_ULFRCO_FREQ (1000UL) |
| mbed_official | 525:c320967f86b9 | 43 | |
| mbed_official | 525:c320967f86b9 | 44 | /******************************************************************************* |
| mbed_official | 525:c320967f86b9 | 45 | ************************** LOCAL VARIABLES ******************************** |
| mbed_official | 525:c320967f86b9 | 46 | ******************************************************************************/ |
| mbed_official | 525:c320967f86b9 | 47 | |
| mbed_official | 525:c320967f86b9 | 48 | /* System oscillator frequencies. These frequencies are normally constant */ |
| mbed_official | 525:c320967f86b9 | 49 | /* for a target, but they are made configurable in order to allow run-time */ |
| mbed_official | 525:c320967f86b9 | 50 | /* handling of different boards. The crystal oscillator clocks can be set */ |
| mbed_official | 525:c320967f86b9 | 51 | /* compile time to a non-default value by defining respective EFM32_nFXO_FREQ */ |
| mbed_official | 525:c320967f86b9 | 52 | /* values according to board design. By defining the EFM32_nFXO_FREQ to 0, */ |
| mbed_official | 525:c320967f86b9 | 53 | /* one indicates that the oscillator is not present, in order to save some */ |
| mbed_official | 525:c320967f86b9 | 54 | /* SW footprint. */ |
| mbed_official | 525:c320967f86b9 | 55 | |
| mbed_official | 525:c320967f86b9 | 56 | #ifndef EFM32_HFXO_FREQ |
| mbed_official | 525:c320967f86b9 | 57 | #define EFM32_HFXO_FREQ (24000000UL) |
| mbed_official | 525:c320967f86b9 | 58 | #define EFM32_HFRCO_MAX_FREQ (21000000UL) |
| mbed_official | 525:c320967f86b9 | 59 | #endif |
| mbed_official | 525:c320967f86b9 | 60 | /* Do not define variable if HF crystal oscillator not present */ |
| mbed_official | 525:c320967f86b9 | 61 | #if (EFM32_HFXO_FREQ > 0) |
| mbed_official | 525:c320967f86b9 | 62 | /** @cond DO_NOT_INCLUDE_WITH_DOXYGEN */ |
| mbed_official | 525:c320967f86b9 | 63 | /** System HFXO clock. */ |
| mbed_official | 525:c320967f86b9 | 64 | static uint32_t SystemHFXOClock = EFM32_HFXO_FREQ; |
| mbed_official | 525:c320967f86b9 | 65 | /** @endcond (DO_NOT_INCLUDE_WITH_DOXYGEN) */ |
| mbed_official | 525:c320967f86b9 | 66 | #endif |
| mbed_official | 525:c320967f86b9 | 67 | |
| mbed_official | 525:c320967f86b9 | 68 | #ifndef EFM32_LFXO_FREQ |
| mbed_official | 525:c320967f86b9 | 69 | #define EFM32_LFXO_FREQ (EFM32_LFRCO_FREQ) |
| mbed_official | 525:c320967f86b9 | 70 | #endif |
| mbed_official | 525:c320967f86b9 | 71 | /* Do not define variable if LF crystal oscillator not present */ |
| mbed_official | 525:c320967f86b9 | 72 | #if (EFM32_LFXO_FREQ > 0) |
| mbed_official | 525:c320967f86b9 | 73 | /** @cond DO_NOT_INCLUDE_WITH_DOXYGEN */ |
| mbed_official | 525:c320967f86b9 | 74 | /** System LFXO clock. */ |
| mbed_official | 525:c320967f86b9 | 75 | static uint32_t SystemLFXOClock = EFM32_LFXO_FREQ; |
| mbed_official | 525:c320967f86b9 | 76 | /** @endcond (DO_NOT_INCLUDE_WITH_DOXYGEN) */ |
| mbed_official | 525:c320967f86b9 | 77 | #endif |
| mbed_official | 525:c320967f86b9 | 78 | |
| mbed_official | 525:c320967f86b9 | 79 | /******************************************************************************* |
| mbed_official | 525:c320967f86b9 | 80 | ************************** GLOBAL VARIABLES ******************************* |
| mbed_official | 525:c320967f86b9 | 81 | ******************************************************************************/ |
| mbed_official | 525:c320967f86b9 | 82 | |
| mbed_official | 525:c320967f86b9 | 83 | /** |
| mbed_official | 525:c320967f86b9 | 84 | * @brief |
| mbed_official | 525:c320967f86b9 | 85 | * System System Clock Frequency (Core Clock). |
| mbed_official | 525:c320967f86b9 | 86 | * |
| mbed_official | 525:c320967f86b9 | 87 | * @details |
| mbed_official | 525:c320967f86b9 | 88 | * Required CMSIS global variable that must be kept up-to-date. |
| mbed_official | 525:c320967f86b9 | 89 | */ |
| mbed_official | 525:c320967f86b9 | 90 | uint32_t SystemCoreClock; |
| mbed_official | 525:c320967f86b9 | 91 | |
| mbed_official | 525:c320967f86b9 | 92 | /******************************************************************************* |
| mbed_official | 525:c320967f86b9 | 93 | ************************** GLOBAL FUNCTIONS ******************************* |
| mbed_official | 525:c320967f86b9 | 94 | ******************************************************************************/ |
| mbed_official | 525:c320967f86b9 | 95 | |
| mbed_official | 525:c320967f86b9 | 96 | /***************************************************************************//** |
| mbed_official | 525:c320967f86b9 | 97 | * @brief |
| mbed_official | 525:c320967f86b9 | 98 | * Get the current core clock frequency. |
| mbed_official | 525:c320967f86b9 | 99 | * |
| mbed_official | 525:c320967f86b9 | 100 | * @details |
| mbed_official | 525:c320967f86b9 | 101 | * Calculate and get the current core clock frequency based on the current |
| mbed_official | 525:c320967f86b9 | 102 | * configuration. Assuming that the SystemCoreClock global variable is |
| mbed_official | 525:c320967f86b9 | 103 | * maintained, the core clock frequency is stored in that variable as well. |
| mbed_official | 525:c320967f86b9 | 104 | * This function will however calculate the core clock based on actual HW |
| mbed_official | 525:c320967f86b9 | 105 | * configuration. It will also update the SystemCoreClock global variable. |
| mbed_official | 525:c320967f86b9 | 106 | * |
| mbed_official | 525:c320967f86b9 | 107 | * @note |
| mbed_official | 525:c320967f86b9 | 108 | * This is an EFM32 proprietary function, not part of the CMSIS definition. |
| mbed_official | 525:c320967f86b9 | 109 | * |
| mbed_official | 525:c320967f86b9 | 110 | * @return |
| mbed_official | 525:c320967f86b9 | 111 | * The current core clock frequency in Hz. |
| mbed_official | 525:c320967f86b9 | 112 | ******************************************************************************/ |
| mbed_official | 525:c320967f86b9 | 113 | uint32_t SystemCoreClockGet(void) |
| mbed_official | 525:c320967f86b9 | 114 | { |
| mbed_official | 525:c320967f86b9 | 115 | uint32_t ret; |
| mbed_official | 525:c320967f86b9 | 116 | |
| mbed_official | 525:c320967f86b9 | 117 | ret = SystemHFClockGet(); |
| mbed_official | 525:c320967f86b9 | 118 | ret >>= (CMU->HFCORECLKDIV & _CMU_HFCORECLKDIV_HFCORECLKDIV_MASK) >> |
| mbed_official | 525:c320967f86b9 | 119 | _CMU_HFCORECLKDIV_HFCORECLKDIV_SHIFT; |
| mbed_official | 525:c320967f86b9 | 120 | |
| mbed_official | 525:c320967f86b9 | 121 | /* Keep CMSIS variable up-to-date just in case */ |
| mbed_official | 525:c320967f86b9 | 122 | SystemCoreClock = ret; |
| mbed_official | 525:c320967f86b9 | 123 | |
| mbed_official | 525:c320967f86b9 | 124 | return ret; |
| mbed_official | 525:c320967f86b9 | 125 | } |
| mbed_official | 525:c320967f86b9 | 126 | |
| mbed_official | 525:c320967f86b9 | 127 | |
| mbed_official | 525:c320967f86b9 | 128 | /***************************************************************************//** |
| mbed_official | 525:c320967f86b9 | 129 | * @brief |
| mbed_official | 525:c320967f86b9 | 130 | * Get the maximum core clock frequency. |
| mbed_official | 525:c320967f86b9 | 131 | * |
| mbed_official | 525:c320967f86b9 | 132 | * @note |
| mbed_official | 525:c320967f86b9 | 133 | * This is an EFR32 proprietary function, not part of the CMSIS definition. |
| mbed_official | 525:c320967f86b9 | 134 | * |
| mbed_official | 525:c320967f86b9 | 135 | * @return |
| mbed_official | 525:c320967f86b9 | 136 | * The maximum core clock frequency in Hz. |
| mbed_official | 525:c320967f86b9 | 137 | ******************************************************************************/ |
| mbed_official | 525:c320967f86b9 | 138 | uint32_t SystemMaxCoreClockGet(void) |
| mbed_official | 525:c320967f86b9 | 139 | { |
| mbed_official | 525:c320967f86b9 | 140 | return (EFM32_HFRCO_MAX_FREQ > EFM32_HFXO_FREQ ? \ |
| mbed_official | 525:c320967f86b9 | 141 | EFM32_HFRCO_MAX_FREQ : EFM32_HFXO_FREQ); |
| mbed_official | 525:c320967f86b9 | 142 | } |
| mbed_official | 525:c320967f86b9 | 143 | |
| mbed_official | 525:c320967f86b9 | 144 | |
| mbed_official | 525:c320967f86b9 | 145 | /***************************************************************************//** |
| mbed_official | 525:c320967f86b9 | 146 | * @brief |
| mbed_official | 525:c320967f86b9 | 147 | * Get the current HFCLK frequency. |
| mbed_official | 525:c320967f86b9 | 148 | * |
| mbed_official | 525:c320967f86b9 | 149 | * @note |
| mbed_official | 525:c320967f86b9 | 150 | * This is an EFM32 proprietary function, not part of the CMSIS definition. |
| mbed_official | 525:c320967f86b9 | 151 | * |
| mbed_official | 525:c320967f86b9 | 152 | * @return |
| mbed_official | 525:c320967f86b9 | 153 | * The current HFCLK frequency in Hz. |
| mbed_official | 525:c320967f86b9 | 154 | ******************************************************************************/ |
| mbed_official | 525:c320967f86b9 | 155 | uint32_t SystemHFClockGet(void) |
| mbed_official | 525:c320967f86b9 | 156 | { |
| mbed_official | 525:c320967f86b9 | 157 | uint32_t ret; |
| mbed_official | 525:c320967f86b9 | 158 | |
| mbed_official | 525:c320967f86b9 | 159 | switch (CMU->STATUS & (CMU_STATUS_HFRCOSEL | CMU_STATUS_HFXOSEL | |
| mbed_official | 525:c320967f86b9 | 160 | CMU_STATUS_LFRCOSEL | CMU_STATUS_LFXOSEL | |
| mbed_official | 525:c320967f86b9 | 161 | CMU_STATUS_USHFRCODIV2SEL)) |
| mbed_official | 525:c320967f86b9 | 162 | { |
| mbed_official | 525:c320967f86b9 | 163 | case CMU_STATUS_LFXOSEL: |
| mbed_official | 525:c320967f86b9 | 164 | #if (EFM32_LFXO_FREQ > 0) |
| mbed_official | 525:c320967f86b9 | 165 | ret = SystemLFXOClock; |
| mbed_official | 525:c320967f86b9 | 166 | #else |
| mbed_official | 525:c320967f86b9 | 167 | /* We should not get here, since core should not be clocked. May */ |
| mbed_official | 525:c320967f86b9 | 168 | /* be caused by a misconfiguration though. */ |
| mbed_official | 525:c320967f86b9 | 169 | ret = 0; |
| mbed_official | 525:c320967f86b9 | 170 | #endif |
| mbed_official | 525:c320967f86b9 | 171 | break; |
| mbed_official | 525:c320967f86b9 | 172 | |
| mbed_official | 525:c320967f86b9 | 173 | case CMU_STATUS_LFRCOSEL: |
| mbed_official | 525:c320967f86b9 | 174 | ret = EFM32_LFRCO_FREQ; |
| mbed_official | 525:c320967f86b9 | 175 | break; |
| mbed_official | 525:c320967f86b9 | 176 | |
| mbed_official | 525:c320967f86b9 | 177 | case CMU_STATUS_HFXOSEL: |
| mbed_official | 525:c320967f86b9 | 178 | #if (EFM32_HFXO_FREQ > 0) |
| mbed_official | 525:c320967f86b9 | 179 | ret = SystemHFXOClock; |
| mbed_official | 525:c320967f86b9 | 180 | #else |
| mbed_official | 525:c320967f86b9 | 181 | /* We should not get here, since core should not be clocked. May */ |
| mbed_official | 525:c320967f86b9 | 182 | /* be caused by a misconfiguration though. */ |
| mbed_official | 525:c320967f86b9 | 183 | ret = 0; |
| mbed_official | 525:c320967f86b9 | 184 | #endif |
| mbed_official | 525:c320967f86b9 | 185 | break; |
| mbed_official | 525:c320967f86b9 | 186 | |
| mbed_official | 525:c320967f86b9 | 187 | case CMU_STATUS_USHFRCODIV2SEL: |
| mbed_official | 525:c320967f86b9 | 188 | ret = 24000000; |
| mbed_official | 525:c320967f86b9 | 189 | break; |
| mbed_official | 525:c320967f86b9 | 190 | |
| mbed_official | 525:c320967f86b9 | 191 | default: /* CMU_STATUS_HFRCOSEL */ |
| mbed_official | 525:c320967f86b9 | 192 | switch (CMU->HFRCOCTRL & _CMU_HFRCOCTRL_BAND_MASK) |
| mbed_official | 525:c320967f86b9 | 193 | { |
| mbed_official | 525:c320967f86b9 | 194 | case CMU_HFRCOCTRL_BAND_21MHZ: |
| mbed_official | 525:c320967f86b9 | 195 | ret = 21000000; |
| mbed_official | 525:c320967f86b9 | 196 | break; |
| mbed_official | 525:c320967f86b9 | 197 | |
| mbed_official | 525:c320967f86b9 | 198 | case CMU_HFRCOCTRL_BAND_14MHZ: |
| mbed_official | 525:c320967f86b9 | 199 | ret = 14000000; |
| mbed_official | 525:c320967f86b9 | 200 | break; |
| mbed_official | 525:c320967f86b9 | 201 | |
| mbed_official | 525:c320967f86b9 | 202 | case CMU_HFRCOCTRL_BAND_11MHZ: |
| mbed_official | 525:c320967f86b9 | 203 | ret = 11000000; |
| mbed_official | 525:c320967f86b9 | 204 | break; |
| mbed_official | 525:c320967f86b9 | 205 | |
| mbed_official | 525:c320967f86b9 | 206 | case CMU_HFRCOCTRL_BAND_7MHZ: |
| mbed_official | 525:c320967f86b9 | 207 | ret = 6600000; |
| mbed_official | 525:c320967f86b9 | 208 | break; |
| mbed_official | 525:c320967f86b9 | 209 | |
| mbed_official | 525:c320967f86b9 | 210 | case CMU_HFRCOCTRL_BAND_1MHZ: |
| mbed_official | 525:c320967f86b9 | 211 | ret = 1200000; |
| mbed_official | 525:c320967f86b9 | 212 | break; |
| mbed_official | 525:c320967f86b9 | 213 | |
| mbed_official | 525:c320967f86b9 | 214 | default: |
| mbed_official | 525:c320967f86b9 | 215 | ret = 0; |
| mbed_official | 525:c320967f86b9 | 216 | break; |
| mbed_official | 525:c320967f86b9 | 217 | } |
| mbed_official | 525:c320967f86b9 | 218 | break; |
| mbed_official | 525:c320967f86b9 | 219 | } |
| mbed_official | 525:c320967f86b9 | 220 | |
| mbed_official | 525:c320967f86b9 | 221 | return ret; |
| mbed_official | 525:c320967f86b9 | 222 | } |
| mbed_official | 525:c320967f86b9 | 223 | |
| mbed_official | 525:c320967f86b9 | 224 | |
| mbed_official | 525:c320967f86b9 | 225 | /**************************************************************************//** |
| mbed_official | 525:c320967f86b9 | 226 | * @brief |
| mbed_official | 525:c320967f86b9 | 227 | * Get high frequency crystal oscillator clock frequency for target system. |
| mbed_official | 525:c320967f86b9 | 228 | * |
| mbed_official | 525:c320967f86b9 | 229 | * @note |
| mbed_official | 525:c320967f86b9 | 230 | * This is an EFM32 proprietary function, not part of the CMSIS definition. |
| mbed_official | 525:c320967f86b9 | 231 | * |
| mbed_official | 525:c320967f86b9 | 232 | * @return |
| mbed_official | 525:c320967f86b9 | 233 | * HFXO frequency in Hz. |
| mbed_official | 525:c320967f86b9 | 234 | *****************************************************************************/ |
| mbed_official | 525:c320967f86b9 | 235 | uint32_t SystemHFXOClockGet(void) |
| mbed_official | 525:c320967f86b9 | 236 | { |
| mbed_official | 525:c320967f86b9 | 237 | /* External crystal oscillator present? */ |
| mbed_official | 525:c320967f86b9 | 238 | #if (EFM32_HFXO_FREQ > 0) |
| mbed_official | 525:c320967f86b9 | 239 | return SystemHFXOClock; |
| mbed_official | 525:c320967f86b9 | 240 | #else |
| mbed_official | 525:c320967f86b9 | 241 | return 0; |
| mbed_official | 525:c320967f86b9 | 242 | #endif |
| mbed_official | 525:c320967f86b9 | 243 | } |
| mbed_official | 525:c320967f86b9 | 244 | |
| mbed_official | 525:c320967f86b9 | 245 | |
| mbed_official | 525:c320967f86b9 | 246 | /**************************************************************************//** |
| mbed_official | 525:c320967f86b9 | 247 | * @brief |
| mbed_official | 525:c320967f86b9 | 248 | * Set high frequency crystal oscillator clock frequency for target system. |
| mbed_official | 525:c320967f86b9 | 249 | * |
| mbed_official | 525:c320967f86b9 | 250 | * @note |
| mbed_official | 525:c320967f86b9 | 251 | * This function is mainly provided for being able to handle target systems |
| mbed_official | 525:c320967f86b9 | 252 | * with different HF crystal oscillator frequencies run-time. If used, it |
| mbed_official | 525:c320967f86b9 | 253 | * should probably only be used once during system startup. |
| mbed_official | 525:c320967f86b9 | 254 | * |
| mbed_official | 525:c320967f86b9 | 255 | * @note |
| mbed_official | 525:c320967f86b9 | 256 | * This is an EFM32 proprietary function, not part of the CMSIS definition. |
| mbed_official | 525:c320967f86b9 | 257 | * |
| mbed_official | 525:c320967f86b9 | 258 | * @param[in] freq |
| mbed_official | 525:c320967f86b9 | 259 | * HFXO frequency in Hz used for target. |
| mbed_official | 525:c320967f86b9 | 260 | *****************************************************************************/ |
| mbed_official | 525:c320967f86b9 | 261 | void SystemHFXOClockSet(uint32_t freq) |
| mbed_official | 525:c320967f86b9 | 262 | { |
| mbed_official | 525:c320967f86b9 | 263 | /* External crystal oscillator present? */ |
| mbed_official | 525:c320967f86b9 | 264 | #if (EFM32_HFXO_FREQ > 0) |
| mbed_official | 525:c320967f86b9 | 265 | SystemHFXOClock = freq; |
| mbed_official | 525:c320967f86b9 | 266 | |
| mbed_official | 525:c320967f86b9 | 267 | /* Update core clock frequency if HFXO is used to clock core */ |
| mbed_official | 525:c320967f86b9 | 268 | if (CMU->STATUS & CMU_STATUS_HFXOSEL) |
| mbed_official | 525:c320967f86b9 | 269 | { |
| mbed_official | 525:c320967f86b9 | 270 | /* The function will update the global variable */ |
| mbed_official | 525:c320967f86b9 | 271 | SystemCoreClockGet(); |
| mbed_official | 525:c320967f86b9 | 272 | } |
| mbed_official | 525:c320967f86b9 | 273 | #else |
| mbed_official | 525:c320967f86b9 | 274 | (void)freq; /* Unused parameter */ |
| mbed_official | 525:c320967f86b9 | 275 | #endif |
| mbed_official | 525:c320967f86b9 | 276 | } |
| mbed_official | 525:c320967f86b9 | 277 | |
| mbed_official | 525:c320967f86b9 | 278 | |
| mbed_official | 525:c320967f86b9 | 279 | /**************************************************************************//** |
| mbed_official | 525:c320967f86b9 | 280 | * @brief |
| mbed_official | 525:c320967f86b9 | 281 | * Initialize the system. |
| mbed_official | 525:c320967f86b9 | 282 | * |
| mbed_official | 525:c320967f86b9 | 283 | * @details |
| mbed_official | 525:c320967f86b9 | 284 | * Do required generic HW system init. |
| mbed_official | 525:c320967f86b9 | 285 | * |
| mbed_official | 525:c320967f86b9 | 286 | * @note |
| mbed_official | 525:c320967f86b9 | 287 | * This function is invoked during system init, before the main() routine |
| mbed_official | 525:c320967f86b9 | 288 | * and any data has been initialized. For this reason, it cannot do any |
| mbed_official | 525:c320967f86b9 | 289 | * initialization of variables etc. |
| mbed_official | 525:c320967f86b9 | 290 | *****************************************************************************/ |
| mbed_official | 525:c320967f86b9 | 291 | void SystemInit(void) |
| mbed_official | 525:c320967f86b9 | 292 | { |
| mbed_official | 525:c320967f86b9 | 293 | } |
| mbed_official | 525:c320967f86b9 | 294 | |
| mbed_official | 525:c320967f86b9 | 295 | |
| mbed_official | 525:c320967f86b9 | 296 | /**************************************************************************//** |
| mbed_official | 525:c320967f86b9 | 297 | * @brief |
| mbed_official | 525:c320967f86b9 | 298 | * Get low frequency RC oscillator clock frequency for target system. |
| mbed_official | 525:c320967f86b9 | 299 | * |
| mbed_official | 525:c320967f86b9 | 300 | * @note |
| mbed_official | 525:c320967f86b9 | 301 | * This is an EFM32 proprietary function, not part of the CMSIS definition. |
| mbed_official | 525:c320967f86b9 | 302 | * |
| mbed_official | 525:c320967f86b9 | 303 | * @return |
| mbed_official | 525:c320967f86b9 | 304 | * LFRCO frequency in Hz. |
| mbed_official | 525:c320967f86b9 | 305 | *****************************************************************************/ |
| mbed_official | 525:c320967f86b9 | 306 | uint32_t SystemLFRCOClockGet(void) |
| mbed_official | 525:c320967f86b9 | 307 | { |
| mbed_official | 525:c320967f86b9 | 308 | /* Currently we assume that this frequency is properly tuned during */ |
| mbed_official | 525:c320967f86b9 | 309 | /* manufacturing and is not changed after reset. If future requirements */ |
| mbed_official | 525:c320967f86b9 | 310 | /* for re-tuning by user, we can add support for that. */ |
| mbed_official | 525:c320967f86b9 | 311 | return EFM32_LFRCO_FREQ; |
| mbed_official | 525:c320967f86b9 | 312 | } |
| mbed_official | 525:c320967f86b9 | 313 | |
| mbed_official | 525:c320967f86b9 | 314 | |
| mbed_official | 525:c320967f86b9 | 315 | /**************************************************************************//** |
| mbed_official | 525:c320967f86b9 | 316 | * @brief |
| mbed_official | 525:c320967f86b9 | 317 | * Get ultra low frequency RC oscillator clock frequency for target system. |
| mbed_official | 525:c320967f86b9 | 318 | * |
| mbed_official | 525:c320967f86b9 | 319 | * @note |
| mbed_official | 525:c320967f86b9 | 320 | * This is an EFM32 proprietary function, not part of the CMSIS definition. |
| mbed_official | 525:c320967f86b9 | 321 | * |
| mbed_official | 525:c320967f86b9 | 322 | * @return |
| mbed_official | 525:c320967f86b9 | 323 | * ULFRCO frequency in Hz. |
| mbed_official | 525:c320967f86b9 | 324 | *****************************************************************************/ |
| mbed_official | 525:c320967f86b9 | 325 | uint32_t SystemULFRCOClockGet(void) |
| mbed_official | 525:c320967f86b9 | 326 | { |
| mbed_official | 525:c320967f86b9 | 327 | /* The ULFRCO frequency is not tuned, and can be very inaccurate */ |
| mbed_official | 525:c320967f86b9 | 328 | return EFM32_ULFRCO_FREQ; |
| mbed_official | 525:c320967f86b9 | 329 | } |
| mbed_official | 525:c320967f86b9 | 330 | |
| mbed_official | 525:c320967f86b9 | 331 | |
| mbed_official | 525:c320967f86b9 | 332 | /**************************************************************************//** |
| mbed_official | 525:c320967f86b9 | 333 | * @brief |
| mbed_official | 525:c320967f86b9 | 334 | * Get low frequency crystal oscillator clock frequency for target system. |
| mbed_official | 525:c320967f86b9 | 335 | * |
| mbed_official | 525:c320967f86b9 | 336 | * @note |
| mbed_official | 525:c320967f86b9 | 337 | * This is an EFM32 proprietary function, not part of the CMSIS definition. |
| mbed_official | 525:c320967f86b9 | 338 | * |
| mbed_official | 525:c320967f86b9 | 339 | * @return |
| mbed_official | 525:c320967f86b9 | 340 | * LFXO frequency in Hz. |
| mbed_official | 525:c320967f86b9 | 341 | *****************************************************************************/ |
| mbed_official | 525:c320967f86b9 | 342 | uint32_t SystemLFXOClockGet(void) |
| mbed_official | 525:c320967f86b9 | 343 | { |
| mbed_official | 525:c320967f86b9 | 344 | /* External crystal oscillator present? */ |
| mbed_official | 525:c320967f86b9 | 345 | #if (EFM32_LFXO_FREQ > 0) |
| mbed_official | 525:c320967f86b9 | 346 | return SystemLFXOClock; |
| mbed_official | 525:c320967f86b9 | 347 | #else |
| mbed_official | 525:c320967f86b9 | 348 | return 0; |
| mbed_official | 525:c320967f86b9 | 349 | #endif |
| mbed_official | 525:c320967f86b9 | 350 | } |
| mbed_official | 525:c320967f86b9 | 351 | |
| mbed_official | 525:c320967f86b9 | 352 | |
| mbed_official | 525:c320967f86b9 | 353 | /**************************************************************************//** |
| mbed_official | 525:c320967f86b9 | 354 | * @brief |
| mbed_official | 525:c320967f86b9 | 355 | * Set low frequency crystal oscillator clock frequency for target system. |
| mbed_official | 525:c320967f86b9 | 356 | * |
| mbed_official | 525:c320967f86b9 | 357 | * @note |
| mbed_official | 525:c320967f86b9 | 358 | * This function is mainly provided for being able to handle target systems |
| mbed_official | 525:c320967f86b9 | 359 | * with different HF crystal oscillator frequencies run-time. If used, it |
| mbed_official | 525:c320967f86b9 | 360 | * should probably only be used once during system startup. |
| mbed_official | 525:c320967f86b9 | 361 | * |
| mbed_official | 525:c320967f86b9 | 362 | * @note |
| mbed_official | 525:c320967f86b9 | 363 | * This is an EFM32 proprietary function, not part of the CMSIS definition. |
| mbed_official | 525:c320967f86b9 | 364 | * |
| mbed_official | 525:c320967f86b9 | 365 | * @param[in] freq |
| mbed_official | 525:c320967f86b9 | 366 | * LFXO frequency in Hz used for target. |
| mbed_official | 525:c320967f86b9 | 367 | *****************************************************************************/ |
| mbed_official | 525:c320967f86b9 | 368 | void SystemLFXOClockSet(uint32_t freq) |
| mbed_official | 525:c320967f86b9 | 369 | { |
| mbed_official | 525:c320967f86b9 | 370 | /* External crystal oscillator present? */ |
| mbed_official | 525:c320967f86b9 | 371 | #if (EFM32_LFXO_FREQ > 0) |
| mbed_official | 525:c320967f86b9 | 372 | SystemLFXOClock = freq; |
| mbed_official | 525:c320967f86b9 | 373 | |
| mbed_official | 525:c320967f86b9 | 374 | /* Update core clock frequency if LFXO is used to clock core */ |
| mbed_official | 525:c320967f86b9 | 375 | if (CMU->STATUS & CMU_STATUS_LFXOSEL) |
| mbed_official | 525:c320967f86b9 | 376 | { |
| mbed_official | 525:c320967f86b9 | 377 | /* The function will update the global variable */ |
| mbed_official | 525:c320967f86b9 | 378 | SystemCoreClockGet(); |
| mbed_official | 525:c320967f86b9 | 379 | } |
| mbed_official | 525:c320967f86b9 | 380 | #else |
| mbed_official | 525:c320967f86b9 | 381 | (void)freq; /* Unused parameter */ |
| mbed_official | 525:c320967f86b9 | 382 | #endif |
| mbed_official | 525:c320967f86b9 | 383 | } |