fix LPC812 PWM
Fork of mbed-dev by
targets/cmsis/TARGET_Silicon_Labs/TARGET_EFM32/TARGET_EFM32PG_STK3401/system_efm32pg1b.c@50:a417edff4437, 2016-01-15 (annotated)
- Committer:
- mbed_official
- Date:
- Fri Jan 15 07:45:16 2016 +0000
- Revision:
- 50:a417edff4437
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?
User | Revision | Line number | New contents of line |
---|---|---|---|
mbed_official | 50:a417edff4437 | 1 | /***************************************************************************//** |
mbed_official | 50:a417edff4437 | 2 | * @file system_efm32pg1b.c |
mbed_official | 50:a417edff4437 | 3 | * @brief CMSIS Cortex-M3/M4 System Layer for EFM32 devices. |
mbed_official | 50:a417edff4437 | 4 | * @version 4.2.0 |
mbed_official | 50:a417edff4437 | 5 | ****************************************************************************** |
mbed_official | 50:a417edff4437 | 6 | * @section License |
mbed_official | 50:a417edff4437 | 7 | * <b>Copyright 2015 Silicon Laboratories, Inc. http://www.silabs.com</b> |
mbed_official | 50:a417edff4437 | 8 | ****************************************************************************** |
mbed_official | 50:a417edff4437 | 9 | * |
mbed_official | 50:a417edff4437 | 10 | * Permission is granted to anyone to use this software for any purpose, |
mbed_official | 50:a417edff4437 | 11 | * including commercial applications, and to alter it and redistribute it |
mbed_official | 50:a417edff4437 | 12 | * freely, subject to the following restrictions: |
mbed_official | 50:a417edff4437 | 13 | * |
mbed_official | 50:a417edff4437 | 14 | * 1. The origin of this software must not be misrepresented; you must not |
mbed_official | 50:a417edff4437 | 15 | * claim that you wrote the original software.@n |
mbed_official | 50:a417edff4437 | 16 | * 2. Altered source versions must be plainly marked as such, and must not be |
mbed_official | 50:a417edff4437 | 17 | * misrepresented as being the original software.@n |
mbed_official | 50:a417edff4437 | 18 | * 3. This notice may not be removed or altered from any source distribution. |
mbed_official | 50:a417edff4437 | 19 | * |
mbed_official | 50:a417edff4437 | 20 | * DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Silicon Laboratories, Inc. |
mbed_official | 50:a417edff4437 | 21 | * has no obligation to support this Software. Silicon Laboratories, Inc. is |
mbed_official | 50:a417edff4437 | 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 |
mbed_official | 50:a417edff4437 | 24 | * merchantability or fitness for any particular purpose or warranties against |
mbed_official | 50:a417edff4437 | 25 | * infringement of any proprietary rights of a third party. |
mbed_official | 50:a417edff4437 | 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 |
mbed_official | 50:a417edff4437 | 29 | * any third party, arising from your use of this Software. |
mbed_official | 50:a417edff4437 | 30 | * |
mbed_official | 50:a417edff4437 | 31 | *****************************************************************************/ |
mbed_official | 50:a417edff4437 | 32 | |
mbed_official | 50:a417edff4437 | 33 | #include <stdint.h> |
mbed_official | 50:a417edff4437 | 34 | #include "em_device.h" |
mbed_official | 50:a417edff4437 | 35 | |
mbed_official | 50:a417edff4437 | 36 | /******************************************************************************* |
mbed_official | 50:a417edff4437 | 37 | ****************************** DEFINES ************************************ |
mbed_official | 50:a417edff4437 | 38 | ******************************************************************************/ |
mbed_official | 50:a417edff4437 | 39 | |
mbed_official | 50:a417edff4437 | 40 | /** LFRCO frequency, tuned to below frequency during manufacturing. */ |
mbed_official | 50:a417edff4437 | 41 | #define EFM32_LFRCO_FREQ (32768UL) |
mbed_official | 50:a417edff4437 | 42 | #define EFM32_ULFRCO_FREQ (1000UL) |
mbed_official | 50:a417edff4437 | 43 | |
mbed_official | 50:a417edff4437 | 44 | /******************************************************************************* |
mbed_official | 50:a417edff4437 | 45 | ************************** LOCAL VARIABLES ******************************** |
mbed_official | 50:a417edff4437 | 46 | ******************************************************************************/ |
mbed_official | 50:a417edff4437 | 47 | |
mbed_official | 50:a417edff4437 | 48 | /* System oscillator frequencies. These frequencies are normally constant */ |
mbed_official | 50:a417edff4437 | 49 | /* for a target, but they are made configurable in order to allow run-time */ |
mbed_official | 50:a417edff4437 | 50 | /* handling of different boards. The crystal oscillator clocks can be set */ |
mbed_official | 50:a417edff4437 | 51 | /* compile time to a non-default value by defining respective EFM_nFXO_FREQ */ |
mbed_official | 50:a417edff4437 | 52 | /* values according to board design. By defining the EFM_nFXO_FREQ to 0, */ |
mbed_official | 50:a417edff4437 | 53 | /* one indicates that the oscillator is not present, in order to save some */ |
mbed_official | 50:a417edff4437 | 54 | /* SW footprint. */ |
mbed_official | 50:a417edff4437 | 55 | |
mbed_official | 50:a417edff4437 | 56 | #ifndef EFM32_HFRCO_MAX_FREQ |
mbed_official | 50:a417edff4437 | 57 | #define EFM32_HFRCO_MAX_FREQ (38000000UL) |
mbed_official | 50:a417edff4437 | 58 | #endif |
mbed_official | 50:a417edff4437 | 59 | |
mbed_official | 50:a417edff4437 | 60 | #ifndef EFM32_HFXO_FREQ |
mbed_official | 50:a417edff4437 | 61 | #define EFM32_HFXO_FREQ (40000000UL) |
mbed_official | 50:a417edff4437 | 62 | #endif |
mbed_official | 50:a417edff4437 | 63 | |
mbed_official | 50:a417edff4437 | 64 | #ifndef EFM32_HFRCO_STARTUP_FREQ |
mbed_official | 50:a417edff4437 | 65 | #define EFM32_HFRCO_STARTUP_FREQ (19000000UL) |
mbed_official | 50:a417edff4437 | 66 | #endif |
mbed_official | 50:a417edff4437 | 67 | |
mbed_official | 50:a417edff4437 | 68 | |
mbed_official | 50:a417edff4437 | 69 | /* Do not define variable if HF crystal oscillator not present */ |
mbed_official | 50:a417edff4437 | 70 | #if (EFM32_HFXO_FREQ > 0UL) |
mbed_official | 50:a417edff4437 | 71 | /** @cond DO_NOT_INCLUDE_WITH_DOXYGEN */ |
mbed_official | 50:a417edff4437 | 72 | /** System HFXO clock. */ |
mbed_official | 50:a417edff4437 | 73 | static uint32_t SystemHFXOClock = EFM32_HFXO_FREQ; |
mbed_official | 50:a417edff4437 | 74 | /** @endcond (DO_NOT_INCLUDE_WITH_DOXYGEN) */ |
mbed_official | 50:a417edff4437 | 75 | #endif |
mbed_official | 50:a417edff4437 | 76 | |
mbed_official | 50:a417edff4437 | 77 | #ifndef EFM32_LFXO_FREQ |
mbed_official | 50:a417edff4437 | 78 | #define EFM32_LFXO_FREQ (EFM32_LFRCO_FREQ) |
mbed_official | 50:a417edff4437 | 79 | #endif |
mbed_official | 50:a417edff4437 | 80 | /* Do not define variable if LF crystal oscillator not present */ |
mbed_official | 50:a417edff4437 | 81 | #if (EFM32_LFXO_FREQ > 0UL) |
mbed_official | 50:a417edff4437 | 82 | /** @cond DO_NOT_INCLUDE_WITH_DOXYGEN */ |
mbed_official | 50:a417edff4437 | 83 | /** System LFXO clock. */ |
mbed_official | 50:a417edff4437 | 84 | static uint32_t SystemLFXOClock = 32768UL; |
mbed_official | 50:a417edff4437 | 85 | /** @endcond (DO_NOT_INCLUDE_WITH_DOXYGEN) */ |
mbed_official | 50:a417edff4437 | 86 | #endif |
mbed_official | 50:a417edff4437 | 87 | |
mbed_official | 50:a417edff4437 | 88 | |
mbed_official | 50:a417edff4437 | 89 | /******************************************************************************* |
mbed_official | 50:a417edff4437 | 90 | ************************** GLOBAL VARIABLES ******************************* |
mbed_official | 50:a417edff4437 | 91 | ******************************************************************************/ |
mbed_official | 50:a417edff4437 | 92 | |
mbed_official | 50:a417edff4437 | 93 | /** |
mbed_official | 50:a417edff4437 | 94 | * @brief |
mbed_official | 50:a417edff4437 | 95 | * System System Clock Frequency (Core Clock). |
mbed_official | 50:a417edff4437 | 96 | * |
mbed_official | 50:a417edff4437 | 97 | * @details |
mbed_official | 50:a417edff4437 | 98 | * Required CMSIS global variable that must be kept up-to-date. |
mbed_official | 50:a417edff4437 | 99 | */ |
mbed_official | 50:a417edff4437 | 100 | uint32_t SystemCoreClock; |
mbed_official | 50:a417edff4437 | 101 | |
mbed_official | 50:a417edff4437 | 102 | |
mbed_official | 50:a417edff4437 | 103 | /** |
mbed_official | 50:a417edff4437 | 104 | * @brief |
mbed_official | 50:a417edff4437 | 105 | * System HFRCO frequency |
mbed_official | 50:a417edff4437 | 106 | * |
mbed_official | 50:a417edff4437 | 107 | * @note |
mbed_official | 50:a417edff4437 | 108 | * This is an EFM32 proprietary variable, not part of the CMSIS definition. |
mbed_official | 50:a417edff4437 | 109 | * |
mbed_official | 50:a417edff4437 | 110 | * @details |
mbed_official | 50:a417edff4437 | 111 | * Frequency of the system HFRCO oscillator |
mbed_official | 50:a417edff4437 | 112 | */ |
mbed_official | 50:a417edff4437 | 113 | uint32_t SystemHfrcoFreq = EFM32_HFRCO_STARTUP_FREQ; |
mbed_official | 50:a417edff4437 | 114 | |
mbed_official | 50:a417edff4437 | 115 | |
mbed_official | 50:a417edff4437 | 116 | /******************************************************************************* |
mbed_official | 50:a417edff4437 | 117 | ************************** GLOBAL FUNCTIONS ******************************* |
mbed_official | 50:a417edff4437 | 118 | ******************************************************************************/ |
mbed_official | 50:a417edff4437 | 119 | |
mbed_official | 50:a417edff4437 | 120 | /***************************************************************************//** |
mbed_official | 50:a417edff4437 | 121 | * @brief |
mbed_official | 50:a417edff4437 | 122 | * Get the current core clock frequency. |
mbed_official | 50:a417edff4437 | 123 | * |
mbed_official | 50:a417edff4437 | 124 | * @details |
mbed_official | 50:a417edff4437 | 125 | * Calculate and get the current core clock frequency based on the current |
mbed_official | 50:a417edff4437 | 126 | * configuration. Assuming that the SystemCoreClock global variable is |
mbed_official | 50:a417edff4437 | 127 | * maintained, the core clock frequency is stored in that variable as well. |
mbed_official | 50:a417edff4437 | 128 | * This function will however calculate the core clock based on actual HW |
mbed_official | 50:a417edff4437 | 129 | * configuration. It will also update the SystemCoreClock global variable. |
mbed_official | 50:a417edff4437 | 130 | * |
mbed_official | 50:a417edff4437 | 131 | * @note |
mbed_official | 50:a417edff4437 | 132 | * This is an EFM32 proprietary function, not part of the CMSIS definition. |
mbed_official | 50:a417edff4437 | 133 | * |
mbed_official | 50:a417edff4437 | 134 | * @return |
mbed_official | 50:a417edff4437 | 135 | * The current core clock frequency in Hz. |
mbed_official | 50:a417edff4437 | 136 | ******************************************************************************/ |
mbed_official | 50:a417edff4437 | 137 | uint32_t SystemCoreClockGet(void) |
mbed_official | 50:a417edff4437 | 138 | { |
mbed_official | 50:a417edff4437 | 139 | uint32_t ret; |
mbed_official | 50:a417edff4437 | 140 | uint32_t presc; |
mbed_official | 50:a417edff4437 | 141 | |
mbed_official | 50:a417edff4437 | 142 | ret = SystemHFClockGet(); |
mbed_official | 50:a417edff4437 | 143 | presc = (CMU->HFCOREPRESC & _CMU_HFCOREPRESC_PRESC_MASK) >> |
mbed_official | 50:a417edff4437 | 144 | _CMU_HFCOREPRESC_PRESC_SHIFT; |
mbed_official | 50:a417edff4437 | 145 | ret /= (presc + 1); |
mbed_official | 50:a417edff4437 | 146 | |
mbed_official | 50:a417edff4437 | 147 | /* Keep CMSIS system clock variable up-to-date */ |
mbed_official | 50:a417edff4437 | 148 | SystemCoreClock = ret; |
mbed_official | 50:a417edff4437 | 149 | |
mbed_official | 50:a417edff4437 | 150 | return ret; |
mbed_official | 50:a417edff4437 | 151 | } |
mbed_official | 50:a417edff4437 | 152 | |
mbed_official | 50:a417edff4437 | 153 | |
mbed_official | 50:a417edff4437 | 154 | /***************************************************************************//** |
mbed_official | 50:a417edff4437 | 155 | * @brief |
mbed_official | 50:a417edff4437 | 156 | * Get the maximum core clock frequency. |
mbed_official | 50:a417edff4437 | 157 | * |
mbed_official | 50:a417edff4437 | 158 | * @note |
mbed_official | 50:a417edff4437 | 159 | * This is an EFM32 proprietary function, not part of the CMSIS definition. |
mbed_official | 50:a417edff4437 | 160 | * |
mbed_official | 50:a417edff4437 | 161 | * @return |
mbed_official | 50:a417edff4437 | 162 | * The maximum core clock frequency in Hz. |
mbed_official | 50:a417edff4437 | 163 | ******************************************************************************/ |
mbed_official | 50:a417edff4437 | 164 | uint32_t SystemMaxCoreClockGet(void) |
mbed_official | 50:a417edff4437 | 165 | { |
mbed_official | 50:a417edff4437 | 166 | return (EFM32_HFRCO_MAX_FREQ > EFM32_HFXO_FREQ ? \ |
mbed_official | 50:a417edff4437 | 167 | EFM32_HFRCO_MAX_FREQ : EFM32_HFXO_FREQ); |
mbed_official | 50:a417edff4437 | 168 | } |
mbed_official | 50:a417edff4437 | 169 | |
mbed_official | 50:a417edff4437 | 170 | |
mbed_official | 50:a417edff4437 | 171 | /***************************************************************************//** |
mbed_official | 50:a417edff4437 | 172 | * @brief |
mbed_official | 50:a417edff4437 | 173 | * Get the current HFCLK frequency. |
mbed_official | 50:a417edff4437 | 174 | * |
mbed_official | 50:a417edff4437 | 175 | * @note |
mbed_official | 50:a417edff4437 | 176 | * This is an EFM32 proprietary function, not part of the CMSIS definition. |
mbed_official | 50:a417edff4437 | 177 | * |
mbed_official | 50:a417edff4437 | 178 | * @return |
mbed_official | 50:a417edff4437 | 179 | * The current HFCLK frequency in Hz. |
mbed_official | 50:a417edff4437 | 180 | ******************************************************************************/ |
mbed_official | 50:a417edff4437 | 181 | uint32_t SystemHFClockGet(void) |
mbed_official | 50:a417edff4437 | 182 | { |
mbed_official | 50:a417edff4437 | 183 | uint32_t ret; |
mbed_official | 50:a417edff4437 | 184 | |
mbed_official | 50:a417edff4437 | 185 | switch (CMU->HFCLKSTATUS & _CMU_HFCLKSTATUS_SELECTED_MASK) |
mbed_official | 50:a417edff4437 | 186 | { |
mbed_official | 50:a417edff4437 | 187 | case CMU_HFCLKSTATUS_SELECTED_LFXO: |
mbed_official | 50:a417edff4437 | 188 | #if (EFM32_LFXO_FREQ > 0) |
mbed_official | 50:a417edff4437 | 189 | ret = SystemLFXOClock; |
mbed_official | 50:a417edff4437 | 190 | #else |
mbed_official | 50:a417edff4437 | 191 | /* We should not get here, since core should not be clocked. May */ |
mbed_official | 50:a417edff4437 | 192 | /* be caused by a misconfiguration though. */ |
mbed_official | 50:a417edff4437 | 193 | ret = 0; |
mbed_official | 50:a417edff4437 | 194 | #endif |
mbed_official | 50:a417edff4437 | 195 | break; |
mbed_official | 50:a417edff4437 | 196 | |
mbed_official | 50:a417edff4437 | 197 | case CMU_HFCLKSTATUS_SELECTED_LFRCO: |
mbed_official | 50:a417edff4437 | 198 | ret = EFM32_LFRCO_FREQ; |
mbed_official | 50:a417edff4437 | 199 | break; |
mbed_official | 50:a417edff4437 | 200 | |
mbed_official | 50:a417edff4437 | 201 | case CMU_HFCLKSTATUS_SELECTED_HFXO: |
mbed_official | 50:a417edff4437 | 202 | #if (EFM32_HFXO_FREQ > 0) |
mbed_official | 50:a417edff4437 | 203 | ret = SystemHFXOClock; |
mbed_official | 50:a417edff4437 | 204 | #else |
mbed_official | 50:a417edff4437 | 205 | /* We should not get here, since core should not be clocked. May */ |
mbed_official | 50:a417edff4437 | 206 | /* be caused by a misconfiguration though. */ |
mbed_official | 50:a417edff4437 | 207 | ret = 0; |
mbed_official | 50:a417edff4437 | 208 | #endif |
mbed_official | 50:a417edff4437 | 209 | break; |
mbed_official | 50:a417edff4437 | 210 | |
mbed_official | 50:a417edff4437 | 211 | default: /* CMU_HFCLKSTATUS_SELECTED_HFRCO */ |
mbed_official | 50:a417edff4437 | 212 | ret = SystemHfrcoFreq; |
mbed_official | 50:a417edff4437 | 213 | break; |
mbed_official | 50:a417edff4437 | 214 | } |
mbed_official | 50:a417edff4437 | 215 | |
mbed_official | 50:a417edff4437 | 216 | return ret; |
mbed_official | 50:a417edff4437 | 217 | } |
mbed_official | 50:a417edff4437 | 218 | |
mbed_official | 50:a417edff4437 | 219 | |
mbed_official | 50:a417edff4437 | 220 | /**************************************************************************//** |
mbed_official | 50:a417edff4437 | 221 | * @brief |
mbed_official | 50:a417edff4437 | 222 | * Get high frequency crystal oscillator clock frequency for target system. |
mbed_official | 50:a417edff4437 | 223 | * |
mbed_official | 50:a417edff4437 | 224 | * @note |
mbed_official | 50:a417edff4437 | 225 | * This is an EFM32 proprietary function, not part of the CMSIS definition. |
mbed_official | 50:a417edff4437 | 226 | * |
mbed_official | 50:a417edff4437 | 227 | * @return |
mbed_official | 50:a417edff4437 | 228 | * HFXO frequency in Hz. |
mbed_official | 50:a417edff4437 | 229 | *****************************************************************************/ |
mbed_official | 50:a417edff4437 | 230 | uint32_t SystemHFXOClockGet(void) |
mbed_official | 50:a417edff4437 | 231 | { |
mbed_official | 50:a417edff4437 | 232 | /* External crystal oscillator present? */ |
mbed_official | 50:a417edff4437 | 233 | #if (EFM32_HFXO_FREQ > 0) |
mbed_official | 50:a417edff4437 | 234 | return SystemHFXOClock; |
mbed_official | 50:a417edff4437 | 235 | #else |
mbed_official | 50:a417edff4437 | 236 | return 0; |
mbed_official | 50:a417edff4437 | 237 | #endif |
mbed_official | 50:a417edff4437 | 238 | } |
mbed_official | 50:a417edff4437 | 239 | |
mbed_official | 50:a417edff4437 | 240 | |
mbed_official | 50:a417edff4437 | 241 | /**************************************************************************//** |
mbed_official | 50:a417edff4437 | 242 | * @brief |
mbed_official | 50:a417edff4437 | 243 | * Set high frequency crystal oscillator clock frequency for target system. |
mbed_official | 50:a417edff4437 | 244 | * |
mbed_official | 50:a417edff4437 | 245 | * @note |
mbed_official | 50:a417edff4437 | 246 | * This function is mainly provided for being able to handle target systems |
mbed_official | 50:a417edff4437 | 247 | * with different HF crystal oscillator frequencies run-time. If used, it |
mbed_official | 50:a417edff4437 | 248 | * should probably only be used once during system startup. |
mbed_official | 50:a417edff4437 | 249 | * |
mbed_official | 50:a417edff4437 | 250 | * @note |
mbed_official | 50:a417edff4437 | 251 | * This is an EFM32 proprietary function, not part of the CMSIS definition. |
mbed_official | 50:a417edff4437 | 252 | * |
mbed_official | 50:a417edff4437 | 253 | * @param[in] freq |
mbed_official | 50:a417edff4437 | 254 | * HFXO frequency in Hz used for target. |
mbed_official | 50:a417edff4437 | 255 | *****************************************************************************/ |
mbed_official | 50:a417edff4437 | 256 | void SystemHFXOClockSet(uint32_t freq) |
mbed_official | 50:a417edff4437 | 257 | { |
mbed_official | 50:a417edff4437 | 258 | /* External crystal oscillator present? */ |
mbed_official | 50:a417edff4437 | 259 | #if (EFM32_HFXO_FREQ > 0) |
mbed_official | 50:a417edff4437 | 260 | SystemHFXOClock = freq; |
mbed_official | 50:a417edff4437 | 261 | |
mbed_official | 50:a417edff4437 | 262 | /* Update core clock frequency if HFXO is used to clock core */ |
mbed_official | 50:a417edff4437 | 263 | if ((CMU->HFCLKSTATUS & _CMU_HFCLKSTATUS_SELECTED_MASK) == CMU_HFCLKSTATUS_SELECTED_HFXO) |
mbed_official | 50:a417edff4437 | 264 | { |
mbed_official | 50:a417edff4437 | 265 | /* The function will update the global variable */ |
mbed_official | 50:a417edff4437 | 266 | SystemCoreClockGet(); |
mbed_official | 50:a417edff4437 | 267 | } |
mbed_official | 50:a417edff4437 | 268 | #else |
mbed_official | 50:a417edff4437 | 269 | (void)freq; /* Unused parameter */ |
mbed_official | 50:a417edff4437 | 270 | #endif |
mbed_official | 50:a417edff4437 | 271 | } |
mbed_official | 50:a417edff4437 | 272 | |
mbed_official | 50:a417edff4437 | 273 | |
mbed_official | 50:a417edff4437 | 274 | /**************************************************************************//** |
mbed_official | 50:a417edff4437 | 275 | * @brief |
mbed_official | 50:a417edff4437 | 276 | * Initialize the system. |
mbed_official | 50:a417edff4437 | 277 | * |
mbed_official | 50:a417edff4437 | 278 | * @details |
mbed_official | 50:a417edff4437 | 279 | * Do required generic HW system init. |
mbed_official | 50:a417edff4437 | 280 | * |
mbed_official | 50:a417edff4437 | 281 | * @note |
mbed_official | 50:a417edff4437 | 282 | * This function is invoked during system init, before the main() routine |
mbed_official | 50:a417edff4437 | 283 | * and any data has been initialized. For this reason, it cannot do any |
mbed_official | 50:a417edff4437 | 284 | * initialization of variables etc. |
mbed_official | 50:a417edff4437 | 285 | *****************************************************************************/ |
mbed_official | 50:a417edff4437 | 286 | void SystemInit(void) |
mbed_official | 50:a417edff4437 | 287 | { |
mbed_official | 50:a417edff4437 | 288 | #if (__FPU_PRESENT == 1) |
mbed_official | 50:a417edff4437 | 289 | /* Set floating point coprosessor access mode. */ |
mbed_official | 50:a417edff4437 | 290 | SCB->CPACR |= ((3UL << 10 * 2) | /* set CP10 Full Access */ |
mbed_official | 50:a417edff4437 | 291 | (3UL << 11 * 2)); /* set CP11 Full Access */ |
mbed_official | 50:a417edff4437 | 292 | #endif |
mbed_official | 50:a417edff4437 | 293 | } |
mbed_official | 50:a417edff4437 | 294 | |
mbed_official | 50:a417edff4437 | 295 | |
mbed_official | 50:a417edff4437 | 296 | /**************************************************************************//** |
mbed_official | 50:a417edff4437 | 297 | * @brief |
mbed_official | 50:a417edff4437 | 298 | * Get low frequency RC oscillator clock frequency for target system. |
mbed_official | 50:a417edff4437 | 299 | * |
mbed_official | 50:a417edff4437 | 300 | * @note |
mbed_official | 50:a417edff4437 | 301 | * This is an EFM32 proprietary function, not part of the CMSIS definition. |
mbed_official | 50:a417edff4437 | 302 | * |
mbed_official | 50:a417edff4437 | 303 | * @return |
mbed_official | 50:a417edff4437 | 304 | * LFRCO frequency in Hz. |
mbed_official | 50:a417edff4437 | 305 | *****************************************************************************/ |
mbed_official | 50:a417edff4437 | 306 | uint32_t SystemLFRCOClockGet(void) |
mbed_official | 50:a417edff4437 | 307 | { |
mbed_official | 50:a417edff4437 | 308 | /* Currently we assume that this frequency is properly tuned during */ |
mbed_official | 50:a417edff4437 | 309 | /* manufacturing and is not changed after reset. If future requirements */ |
mbed_official | 50:a417edff4437 | 310 | /* for re-tuning by user, we can add support for that. */ |
mbed_official | 50:a417edff4437 | 311 | return EFM32_LFRCO_FREQ; |
mbed_official | 50:a417edff4437 | 312 | } |
mbed_official | 50:a417edff4437 | 313 | |
mbed_official | 50:a417edff4437 | 314 | |
mbed_official | 50:a417edff4437 | 315 | /**************************************************************************//** |
mbed_official | 50:a417edff4437 | 316 | * @brief |
mbed_official | 50:a417edff4437 | 317 | * Get ultra low frequency RC oscillator clock frequency for target system. |
mbed_official | 50:a417edff4437 | 318 | * |
mbed_official | 50:a417edff4437 | 319 | * @note |
mbed_official | 50:a417edff4437 | 320 | * This is an EFM32 proprietary function, not part of the CMSIS definition. |
mbed_official | 50:a417edff4437 | 321 | * |
mbed_official | 50:a417edff4437 | 322 | * @return |
mbed_official | 50:a417edff4437 | 323 | * ULFRCO frequency in Hz. |
mbed_official | 50:a417edff4437 | 324 | *****************************************************************************/ |
mbed_official | 50:a417edff4437 | 325 | uint32_t SystemULFRCOClockGet(void) |
mbed_official | 50:a417edff4437 | 326 | { |
mbed_official | 50:a417edff4437 | 327 | /* The ULFRCO frequency is not tuned, and can be very inaccurate */ |
mbed_official | 50:a417edff4437 | 328 | return EFM32_ULFRCO_FREQ; |
mbed_official | 50:a417edff4437 | 329 | } |
mbed_official | 50:a417edff4437 | 330 | |
mbed_official | 50:a417edff4437 | 331 | |
mbed_official | 50:a417edff4437 | 332 | /**************************************************************************//** |
mbed_official | 50:a417edff4437 | 333 | * @brief |
mbed_official | 50:a417edff4437 | 334 | * Get low frequency crystal oscillator clock frequency for target system. |
mbed_official | 50:a417edff4437 | 335 | * |
mbed_official | 50:a417edff4437 | 336 | * @note |
mbed_official | 50:a417edff4437 | 337 | * This is an EFM32 proprietary function, not part of the CMSIS definition. |
mbed_official | 50:a417edff4437 | 338 | * |
mbed_official | 50:a417edff4437 | 339 | * @return |
mbed_official | 50:a417edff4437 | 340 | * LFXO frequency in Hz. |
mbed_official | 50:a417edff4437 | 341 | *****************************************************************************/ |
mbed_official | 50:a417edff4437 | 342 | uint32_t SystemLFXOClockGet(void) |
mbed_official | 50:a417edff4437 | 343 | { |
mbed_official | 50:a417edff4437 | 344 | /* External crystal oscillator present? */ |
mbed_official | 50:a417edff4437 | 345 | #if (EFM32_LFXO_FREQ > 0) |
mbed_official | 50:a417edff4437 | 346 | return SystemLFXOClock; |
mbed_official | 50:a417edff4437 | 347 | #else |
mbed_official | 50:a417edff4437 | 348 | return 0; |
mbed_official | 50:a417edff4437 | 349 | #endif |
mbed_official | 50:a417edff4437 | 350 | } |
mbed_official | 50:a417edff4437 | 351 | |
mbed_official | 50:a417edff4437 | 352 | |
mbed_official | 50:a417edff4437 | 353 | /**************************************************************************//** |
mbed_official | 50:a417edff4437 | 354 | * @brief |
mbed_official | 50:a417edff4437 | 355 | * Set low frequency crystal oscillator clock frequency for target system. |
mbed_official | 50:a417edff4437 | 356 | * |
mbed_official | 50:a417edff4437 | 357 | * @note |
mbed_official | 50:a417edff4437 | 358 | * This function is mainly provided for being able to handle target systems |
mbed_official | 50:a417edff4437 | 359 | * with different HF crystal oscillator frequencies run-time. If used, it |
mbed_official | 50:a417edff4437 | 360 | * should probably only be used once during system startup. |
mbed_official | 50:a417edff4437 | 361 | * |
mbed_official | 50:a417edff4437 | 362 | * @note |
mbed_official | 50:a417edff4437 | 363 | * This is an EFM32 proprietary function, not part of the CMSIS definition. |
mbed_official | 50:a417edff4437 | 364 | * |
mbed_official | 50:a417edff4437 | 365 | * @param[in] freq |
mbed_official | 50:a417edff4437 | 366 | * LFXO frequency in Hz used for target. |
mbed_official | 50:a417edff4437 | 367 | *****************************************************************************/ |
mbed_official | 50:a417edff4437 | 368 | void SystemLFXOClockSet(uint32_t freq) |
mbed_official | 50:a417edff4437 | 369 | { |
mbed_official | 50:a417edff4437 | 370 | /* External crystal oscillator present? */ |
mbed_official | 50:a417edff4437 | 371 | #if (EFM32_LFXO_FREQ > 0) |
mbed_official | 50:a417edff4437 | 372 | SystemLFXOClock = freq; |
mbed_official | 50:a417edff4437 | 373 | |
mbed_official | 50:a417edff4437 | 374 | /* Update core clock frequency if LFXO is used to clock core */ |
mbed_official | 50:a417edff4437 | 375 | if ((CMU->HFCLKSTATUS & _CMU_HFCLKSTATUS_SELECTED_MASK) == CMU_HFCLKSTATUS_SELECTED_LFXO) |
mbed_official | 50:a417edff4437 | 376 | { |
mbed_official | 50:a417edff4437 | 377 | /* The function will update the global variable */ |
mbed_official | 50:a417edff4437 | 378 | SystemCoreClockGet(); |
mbed_official | 50:a417edff4437 | 379 | } |
mbed_official | 50:a417edff4437 | 380 | #else |
mbed_official | 50:a417edff4437 | 381 | (void)freq; /* Unused parameter */ |
mbed_official | 50:a417edff4437 | 382 | #endif |
mbed_official | 50:a417edff4437 | 383 | } |