added prescaler for 16 bit pwm in LPC1347 target
Fork of mbed-dev by
targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/emlib/src/em_adc.c@0:9b334a45a8ff, 2015-10-01 (annotated)
- Committer:
- bogdanm
- Date:
- Thu Oct 01 15:25:22 2015 +0300
- Revision:
- 0:9b334a45a8ff
- Child:
- 50:a417edff4437
Initial commit on mbed-dev
Replaces mbed-src (now inactive)
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
bogdanm | 0:9b334a45a8ff | 1 | /***************************************************************************//** |
bogdanm | 0:9b334a45a8ff | 2 | * @file em_adc.c |
bogdanm | 0:9b334a45a8ff | 3 | * @brief Analog to Digital Converter (ADC) Peripheral API |
bogdanm | 0:9b334a45a8ff | 4 | * @version 3.20.12 |
bogdanm | 0:9b334a45a8ff | 5 | ******************************************************************************* |
bogdanm | 0:9b334a45a8ff | 6 | * @section License |
bogdanm | 0:9b334a45a8ff | 7 | * <b>(C) Copyright 2014 Silicon Labs, 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. |
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. |
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 Labs has no |
bogdanm | 0:9b334a45a8ff | 21 | * obligation to support this Software. Silicon Labs is providing the |
bogdanm | 0:9b334a45a8ff | 22 | * Software "AS IS", with no express or implied warranties of any kind, |
bogdanm | 0:9b334a45a8ff | 23 | * including, but not limited to, any implied warranties of merchantability |
bogdanm | 0:9b334a45a8ff | 24 | * or fitness for any particular purpose or warranties against infringement |
bogdanm | 0:9b334a45a8ff | 25 | * of any proprietary rights of a third party. |
bogdanm | 0:9b334a45a8ff | 26 | * |
bogdanm | 0:9b334a45a8ff | 27 | * Silicon Labs will not be liable for any consequential, incidental, or |
bogdanm | 0:9b334a45a8ff | 28 | * special damages, or any other relief, or for any claim by any third party, |
bogdanm | 0:9b334a45a8ff | 29 | * arising from your use of this Software. |
bogdanm | 0:9b334a45a8ff | 30 | * |
bogdanm | 0:9b334a45a8ff | 31 | ******************************************************************************/ |
bogdanm | 0:9b334a45a8ff | 32 | |
bogdanm | 0:9b334a45a8ff | 33 | |
bogdanm | 0:9b334a45a8ff | 34 | #include "em_adc.h" |
bogdanm | 0:9b334a45a8ff | 35 | #if defined(ADC_COUNT) && (ADC_COUNT > 0) |
bogdanm | 0:9b334a45a8ff | 36 | |
bogdanm | 0:9b334a45a8ff | 37 | #include "em_cmu.h" |
bogdanm | 0:9b334a45a8ff | 38 | #include "em_assert.h" |
bogdanm | 0:9b334a45a8ff | 39 | |
bogdanm | 0:9b334a45a8ff | 40 | /***************************************************************************//** |
bogdanm | 0:9b334a45a8ff | 41 | * @addtogroup EM_Library |
bogdanm | 0:9b334a45a8ff | 42 | * @{ |
bogdanm | 0:9b334a45a8ff | 43 | ******************************************************************************/ |
bogdanm | 0:9b334a45a8ff | 44 | |
bogdanm | 0:9b334a45a8ff | 45 | /***************************************************************************//** |
bogdanm | 0:9b334a45a8ff | 46 | * @addtogroup ADC |
bogdanm | 0:9b334a45a8ff | 47 | * @brief Analog to Digital Converter (ADC) Peripheral API |
bogdanm | 0:9b334a45a8ff | 48 | * @{ |
bogdanm | 0:9b334a45a8ff | 49 | ******************************************************************************/ |
bogdanm | 0:9b334a45a8ff | 50 | |
bogdanm | 0:9b334a45a8ff | 51 | /******************************************************************************* |
bogdanm | 0:9b334a45a8ff | 52 | ******************************* DEFINES *********************************** |
bogdanm | 0:9b334a45a8ff | 53 | ******************************************************************************/ |
bogdanm | 0:9b334a45a8ff | 54 | |
bogdanm | 0:9b334a45a8ff | 55 | /** @cond DO_NOT_INCLUDE_WITH_DOXYGEN */ |
bogdanm | 0:9b334a45a8ff | 56 | |
bogdanm | 0:9b334a45a8ff | 57 | /** Validation of ADC register block pointer reference for assert statements. */ |
bogdanm | 0:9b334a45a8ff | 58 | #define ADC_REF_VALID(ref) ((ref) == ADC0) |
bogdanm | 0:9b334a45a8ff | 59 | |
bogdanm | 0:9b334a45a8ff | 60 | /** Max ADC clock */ |
bogdanm | 0:9b334a45a8ff | 61 | #define ADC_MAX_CLOCK 13000000 |
bogdanm | 0:9b334a45a8ff | 62 | |
bogdanm | 0:9b334a45a8ff | 63 | /** Min ADC clock */ |
bogdanm | 0:9b334a45a8ff | 64 | #define ADC_MIN_CLOCK 32000 |
bogdanm | 0:9b334a45a8ff | 65 | |
bogdanm | 0:9b334a45a8ff | 66 | /** @endcond */ |
bogdanm | 0:9b334a45a8ff | 67 | |
bogdanm | 0:9b334a45a8ff | 68 | |
bogdanm | 0:9b334a45a8ff | 69 | /******************************************************************************* |
bogdanm | 0:9b334a45a8ff | 70 | *************************** LOCAL FUNCTIONS ******************************* |
bogdanm | 0:9b334a45a8ff | 71 | ******************************************************************************/ |
bogdanm | 0:9b334a45a8ff | 72 | |
bogdanm | 0:9b334a45a8ff | 73 | /** @cond DO_NOT_INCLUDE_WITH_DOXYGEN */ |
bogdanm | 0:9b334a45a8ff | 74 | |
bogdanm | 0:9b334a45a8ff | 75 | /***************************************************************************//** |
bogdanm | 0:9b334a45a8ff | 76 | * @brief |
bogdanm | 0:9b334a45a8ff | 77 | * Load SCAN calibrate register with predefined values for a certain |
bogdanm | 0:9b334a45a8ff | 78 | * reference. |
bogdanm | 0:9b334a45a8ff | 79 | * |
bogdanm | 0:9b334a45a8ff | 80 | * @details |
bogdanm | 0:9b334a45a8ff | 81 | * During production, calibration values are made and stored in the device |
bogdanm | 0:9b334a45a8ff | 82 | * information page for known references. Notice that for external references, |
bogdanm | 0:9b334a45a8ff | 83 | * calibration values must be determined explicitly, and this function |
bogdanm | 0:9b334a45a8ff | 84 | * will not modify the calibration register. |
bogdanm | 0:9b334a45a8ff | 85 | * |
bogdanm | 0:9b334a45a8ff | 86 | * @param[in] adc |
bogdanm | 0:9b334a45a8ff | 87 | * Pointer to ADC peripheral register block. |
bogdanm | 0:9b334a45a8ff | 88 | * |
bogdanm | 0:9b334a45a8ff | 89 | * @param[in] ref |
bogdanm | 0:9b334a45a8ff | 90 | * Reference to load calibrated values for. No values are loaded for |
bogdanm | 0:9b334a45a8ff | 91 | * external references. |
bogdanm | 0:9b334a45a8ff | 92 | ******************************************************************************/ |
bogdanm | 0:9b334a45a8ff | 93 | static void ADC_CalibrateLoadScan(ADC_TypeDef *adc, ADC_Ref_TypeDef ref) |
bogdanm | 0:9b334a45a8ff | 94 | { |
bogdanm | 0:9b334a45a8ff | 95 | uint32_t cal; |
bogdanm | 0:9b334a45a8ff | 96 | |
bogdanm | 0:9b334a45a8ff | 97 | /* Load proper calibration data depending on selected reference */ |
bogdanm | 0:9b334a45a8ff | 98 | /* NOTE: We use ...SCAN... defines below, they are the same as */ |
bogdanm | 0:9b334a45a8ff | 99 | /* similar ...SINGLE... defines. */ |
bogdanm | 0:9b334a45a8ff | 100 | switch (ref) |
bogdanm | 0:9b334a45a8ff | 101 | { |
bogdanm | 0:9b334a45a8ff | 102 | case adcRef1V25: |
bogdanm | 0:9b334a45a8ff | 103 | cal = adc->CAL & ~(_ADC_CAL_SCANOFFSET_MASK | _ADC_CAL_SCANGAIN_MASK); |
bogdanm | 0:9b334a45a8ff | 104 | cal |= ((DEVINFO->ADC0CAL0 & _DEVINFO_ADC0CAL0_1V25_GAIN_MASK) >> |
bogdanm | 0:9b334a45a8ff | 105 | _DEVINFO_ADC0CAL0_1V25_GAIN_SHIFT) << _ADC_CAL_SCANGAIN_SHIFT; |
bogdanm | 0:9b334a45a8ff | 106 | cal |= ((DEVINFO->ADC0CAL0 & _DEVINFO_ADC0CAL0_1V25_OFFSET_MASK) >> |
bogdanm | 0:9b334a45a8ff | 107 | _DEVINFO_ADC0CAL0_1V25_OFFSET_SHIFT) << _ADC_CAL_SCANOFFSET_SHIFT; |
bogdanm | 0:9b334a45a8ff | 108 | adc->CAL = cal; |
bogdanm | 0:9b334a45a8ff | 109 | break; |
bogdanm | 0:9b334a45a8ff | 110 | |
bogdanm | 0:9b334a45a8ff | 111 | case adcRef2V5: |
bogdanm | 0:9b334a45a8ff | 112 | cal = adc->CAL & ~(_ADC_CAL_SCANOFFSET_MASK | _ADC_CAL_SCANGAIN_MASK); |
bogdanm | 0:9b334a45a8ff | 113 | cal |= ((DEVINFO->ADC0CAL0 & _DEVINFO_ADC0CAL0_2V5_GAIN_MASK) >> |
bogdanm | 0:9b334a45a8ff | 114 | _DEVINFO_ADC0CAL0_2V5_GAIN_SHIFT) << _ADC_CAL_SCANGAIN_SHIFT; |
bogdanm | 0:9b334a45a8ff | 115 | cal |= ((DEVINFO->ADC0CAL0 & _DEVINFO_ADC0CAL0_2V5_OFFSET_MASK) >> |
bogdanm | 0:9b334a45a8ff | 116 | _DEVINFO_ADC0CAL0_2V5_OFFSET_SHIFT) << _ADC_CAL_SCANOFFSET_SHIFT; |
bogdanm | 0:9b334a45a8ff | 117 | adc->CAL = cal; |
bogdanm | 0:9b334a45a8ff | 118 | break; |
bogdanm | 0:9b334a45a8ff | 119 | |
bogdanm | 0:9b334a45a8ff | 120 | case adcRefVDD: |
bogdanm | 0:9b334a45a8ff | 121 | cal = adc->CAL & ~(_ADC_CAL_SCANOFFSET_MASK | _ADC_CAL_SCANGAIN_MASK); |
bogdanm | 0:9b334a45a8ff | 122 | cal |= ((DEVINFO->ADC0CAL1 & _DEVINFO_ADC0CAL1_VDD_GAIN_MASK) >> |
bogdanm | 0:9b334a45a8ff | 123 | _DEVINFO_ADC0CAL1_VDD_GAIN_SHIFT) << _ADC_CAL_SCANGAIN_SHIFT; |
bogdanm | 0:9b334a45a8ff | 124 | cal |= ((DEVINFO->ADC0CAL1 & _DEVINFO_ADC0CAL1_VDD_OFFSET_MASK) >> |
bogdanm | 0:9b334a45a8ff | 125 | _DEVINFO_ADC0CAL1_VDD_OFFSET_SHIFT) << _ADC_CAL_SCANOFFSET_SHIFT; |
bogdanm | 0:9b334a45a8ff | 126 | adc->CAL = cal; |
bogdanm | 0:9b334a45a8ff | 127 | break; |
bogdanm | 0:9b334a45a8ff | 128 | |
bogdanm | 0:9b334a45a8ff | 129 | case adcRef5VDIFF: |
bogdanm | 0:9b334a45a8ff | 130 | cal = adc->CAL & ~(_ADC_CAL_SCANOFFSET_MASK | _ADC_CAL_SCANGAIN_MASK); |
bogdanm | 0:9b334a45a8ff | 131 | cal |= ((DEVINFO->ADC0CAL1 & _DEVINFO_ADC0CAL1_5VDIFF_GAIN_MASK) >> |
bogdanm | 0:9b334a45a8ff | 132 | _DEVINFO_ADC0CAL1_5VDIFF_GAIN_SHIFT) << _ADC_CAL_SCANGAIN_SHIFT; |
bogdanm | 0:9b334a45a8ff | 133 | cal |= ((DEVINFO->ADC0CAL1 & _DEVINFO_ADC0CAL1_5VDIFF_OFFSET_MASK) >> |
bogdanm | 0:9b334a45a8ff | 134 | _DEVINFO_ADC0CAL1_5VDIFF_OFFSET_SHIFT) << _ADC_CAL_SCANOFFSET_SHIFT; |
bogdanm | 0:9b334a45a8ff | 135 | adc->CAL = cal; |
bogdanm | 0:9b334a45a8ff | 136 | break; |
bogdanm | 0:9b334a45a8ff | 137 | |
bogdanm | 0:9b334a45a8ff | 138 | case adcRef2xVDD: |
bogdanm | 0:9b334a45a8ff | 139 | /* Gain value not of relevance for this reference, leave as is */ |
bogdanm | 0:9b334a45a8ff | 140 | cal = adc->CAL & ~_ADC_CAL_SCANOFFSET_MASK; |
bogdanm | 0:9b334a45a8ff | 141 | cal |= ((DEVINFO->ADC0CAL2 & _DEVINFO_ADC0CAL2_2XVDDVSS_OFFSET_MASK) >> |
bogdanm | 0:9b334a45a8ff | 142 | _DEVINFO_ADC0CAL2_2XVDDVSS_OFFSET_SHIFT) << _ADC_CAL_SCANOFFSET_SHIFT; |
bogdanm | 0:9b334a45a8ff | 143 | adc->CAL = cal; |
bogdanm | 0:9b334a45a8ff | 144 | break; |
bogdanm | 0:9b334a45a8ff | 145 | |
bogdanm | 0:9b334a45a8ff | 146 | /* For external references, the calibration must be determined for the */ |
bogdanm | 0:9b334a45a8ff | 147 | /* specific application and set explicitly. */ |
bogdanm | 0:9b334a45a8ff | 148 | default: |
bogdanm | 0:9b334a45a8ff | 149 | break; |
bogdanm | 0:9b334a45a8ff | 150 | } |
bogdanm | 0:9b334a45a8ff | 151 | } |
bogdanm | 0:9b334a45a8ff | 152 | |
bogdanm | 0:9b334a45a8ff | 153 | /***************************************************************************//** |
bogdanm | 0:9b334a45a8ff | 154 | * @brief |
bogdanm | 0:9b334a45a8ff | 155 | * Load SINGLE calibrate register with predefined values for a certain |
bogdanm | 0:9b334a45a8ff | 156 | * reference. |
bogdanm | 0:9b334a45a8ff | 157 | * |
bogdanm | 0:9b334a45a8ff | 158 | * @details |
bogdanm | 0:9b334a45a8ff | 159 | * During production, calibration values are made and stored in the device |
bogdanm | 0:9b334a45a8ff | 160 | * information page for known references. Notice that for external references, |
bogdanm | 0:9b334a45a8ff | 161 | * calibration values must be determined explicitly, and this function |
bogdanm | 0:9b334a45a8ff | 162 | * will not modify the calibration register. |
bogdanm | 0:9b334a45a8ff | 163 | * |
bogdanm | 0:9b334a45a8ff | 164 | * @param[in] adc |
bogdanm | 0:9b334a45a8ff | 165 | * Pointer to ADC peripheral register block. |
bogdanm | 0:9b334a45a8ff | 166 | * |
bogdanm | 0:9b334a45a8ff | 167 | * @param[in] ref |
bogdanm | 0:9b334a45a8ff | 168 | * Reference to load calibrated values for. No values are loaded for |
bogdanm | 0:9b334a45a8ff | 169 | * external references. |
bogdanm | 0:9b334a45a8ff | 170 | ******************************************************************************/ |
bogdanm | 0:9b334a45a8ff | 171 | static void ADC_CalibrateLoadSingle(ADC_TypeDef *adc, ADC_Ref_TypeDef ref) |
bogdanm | 0:9b334a45a8ff | 172 | { |
bogdanm | 0:9b334a45a8ff | 173 | uint32_t cal; |
bogdanm | 0:9b334a45a8ff | 174 | |
bogdanm | 0:9b334a45a8ff | 175 | /* Load proper calibration data depending on selected reference */ |
bogdanm | 0:9b334a45a8ff | 176 | /* NOTE: We use ...SCAN... defines below, they are the same as */ |
bogdanm | 0:9b334a45a8ff | 177 | /* similar ...SINGLE... defines. */ |
bogdanm | 0:9b334a45a8ff | 178 | switch (ref) |
bogdanm | 0:9b334a45a8ff | 179 | { |
bogdanm | 0:9b334a45a8ff | 180 | case adcRef1V25: |
bogdanm | 0:9b334a45a8ff | 181 | cal = adc->CAL & ~(_ADC_CAL_SINGLEOFFSET_MASK | _ADC_CAL_SINGLEGAIN_MASK); |
bogdanm | 0:9b334a45a8ff | 182 | cal |= ((DEVINFO->ADC0CAL0 & _DEVINFO_ADC0CAL0_1V25_GAIN_MASK) >> |
bogdanm | 0:9b334a45a8ff | 183 | _DEVINFO_ADC0CAL0_1V25_GAIN_SHIFT) << _ADC_CAL_SINGLEGAIN_SHIFT; |
bogdanm | 0:9b334a45a8ff | 184 | cal |= ((DEVINFO->ADC0CAL0 & _DEVINFO_ADC0CAL0_1V25_OFFSET_MASK) >> |
bogdanm | 0:9b334a45a8ff | 185 | _DEVINFO_ADC0CAL0_1V25_OFFSET_SHIFT) << _ADC_CAL_SINGLEOFFSET_SHIFT; |
bogdanm | 0:9b334a45a8ff | 186 | adc->CAL = cal; |
bogdanm | 0:9b334a45a8ff | 187 | break; |
bogdanm | 0:9b334a45a8ff | 188 | |
bogdanm | 0:9b334a45a8ff | 189 | case adcRef2V5: |
bogdanm | 0:9b334a45a8ff | 190 | cal = adc->CAL & ~(_ADC_CAL_SINGLEOFFSET_MASK | _ADC_CAL_SINGLEGAIN_MASK); |
bogdanm | 0:9b334a45a8ff | 191 | cal |= ((DEVINFO->ADC0CAL0 & _DEVINFO_ADC0CAL0_2V5_GAIN_MASK) >> |
bogdanm | 0:9b334a45a8ff | 192 | _DEVINFO_ADC0CAL0_2V5_GAIN_SHIFT) << _ADC_CAL_SINGLEGAIN_SHIFT; |
bogdanm | 0:9b334a45a8ff | 193 | cal |= ((DEVINFO->ADC0CAL0 & _DEVINFO_ADC0CAL0_2V5_OFFSET_MASK) >> |
bogdanm | 0:9b334a45a8ff | 194 | _DEVINFO_ADC0CAL0_2V5_OFFSET_SHIFT) << _ADC_CAL_SINGLEOFFSET_SHIFT; |
bogdanm | 0:9b334a45a8ff | 195 | adc->CAL = cal; |
bogdanm | 0:9b334a45a8ff | 196 | break; |
bogdanm | 0:9b334a45a8ff | 197 | |
bogdanm | 0:9b334a45a8ff | 198 | case adcRefVDD: |
bogdanm | 0:9b334a45a8ff | 199 | cal = adc->CAL & ~(_ADC_CAL_SINGLEOFFSET_MASK | _ADC_CAL_SINGLEGAIN_MASK); |
bogdanm | 0:9b334a45a8ff | 200 | cal |= ((DEVINFO->ADC0CAL1 & _DEVINFO_ADC0CAL1_VDD_GAIN_MASK) >> |
bogdanm | 0:9b334a45a8ff | 201 | _DEVINFO_ADC0CAL1_VDD_GAIN_SHIFT) << _ADC_CAL_SINGLEGAIN_SHIFT; |
bogdanm | 0:9b334a45a8ff | 202 | cal |= ((DEVINFO->ADC0CAL1 & _DEVINFO_ADC0CAL1_VDD_OFFSET_MASK) >> |
bogdanm | 0:9b334a45a8ff | 203 | _DEVINFO_ADC0CAL1_VDD_OFFSET_SHIFT) << _ADC_CAL_SINGLEOFFSET_SHIFT; |
bogdanm | 0:9b334a45a8ff | 204 | adc->CAL = cal; |
bogdanm | 0:9b334a45a8ff | 205 | break; |
bogdanm | 0:9b334a45a8ff | 206 | |
bogdanm | 0:9b334a45a8ff | 207 | case adcRef5VDIFF: |
bogdanm | 0:9b334a45a8ff | 208 | cal = adc->CAL & ~(_ADC_CAL_SINGLEOFFSET_MASK | _ADC_CAL_SINGLEGAIN_MASK); |
bogdanm | 0:9b334a45a8ff | 209 | cal |= ((DEVINFO->ADC0CAL1 & _DEVINFO_ADC0CAL1_5VDIFF_GAIN_MASK) >> |
bogdanm | 0:9b334a45a8ff | 210 | _DEVINFO_ADC0CAL1_5VDIFF_GAIN_SHIFT) << _ADC_CAL_SINGLEGAIN_SHIFT; |
bogdanm | 0:9b334a45a8ff | 211 | cal |= ((DEVINFO->ADC0CAL1 & _DEVINFO_ADC0CAL1_5VDIFF_OFFSET_MASK) >> |
bogdanm | 0:9b334a45a8ff | 212 | _DEVINFO_ADC0CAL1_5VDIFF_OFFSET_SHIFT) << _ADC_CAL_SINGLEOFFSET_SHIFT; |
bogdanm | 0:9b334a45a8ff | 213 | adc->CAL = cal; |
bogdanm | 0:9b334a45a8ff | 214 | break; |
bogdanm | 0:9b334a45a8ff | 215 | |
bogdanm | 0:9b334a45a8ff | 216 | case adcRef2xVDD: |
bogdanm | 0:9b334a45a8ff | 217 | /* Gain value not of relevance for this reference, leave as is */ |
bogdanm | 0:9b334a45a8ff | 218 | cal = adc->CAL & ~_ADC_CAL_SINGLEOFFSET_MASK; |
bogdanm | 0:9b334a45a8ff | 219 | cal |= ((DEVINFO->ADC0CAL2 & _DEVINFO_ADC0CAL2_2XVDDVSS_OFFSET_MASK) >> |
bogdanm | 0:9b334a45a8ff | 220 | _DEVINFO_ADC0CAL2_2XVDDVSS_OFFSET_SHIFT) << _ADC_CAL_SINGLEOFFSET_SHIFT; |
bogdanm | 0:9b334a45a8ff | 221 | adc->CAL = cal; |
bogdanm | 0:9b334a45a8ff | 222 | break; |
bogdanm | 0:9b334a45a8ff | 223 | |
bogdanm | 0:9b334a45a8ff | 224 | /* For external references, the calibration must be determined for the */ |
bogdanm | 0:9b334a45a8ff | 225 | /* specific application and set explicitly. */ |
bogdanm | 0:9b334a45a8ff | 226 | default: |
bogdanm | 0:9b334a45a8ff | 227 | break; |
bogdanm | 0:9b334a45a8ff | 228 | } |
bogdanm | 0:9b334a45a8ff | 229 | } |
bogdanm | 0:9b334a45a8ff | 230 | |
bogdanm | 0:9b334a45a8ff | 231 | /** @endcond */ |
bogdanm | 0:9b334a45a8ff | 232 | |
bogdanm | 0:9b334a45a8ff | 233 | /******************************************************************************* |
bogdanm | 0:9b334a45a8ff | 234 | ************************** GLOBAL FUNCTIONS ******************************* |
bogdanm | 0:9b334a45a8ff | 235 | ******************************************************************************/ |
bogdanm | 0:9b334a45a8ff | 236 | |
bogdanm | 0:9b334a45a8ff | 237 | /***************************************************************************//** |
bogdanm | 0:9b334a45a8ff | 238 | * @brief |
bogdanm | 0:9b334a45a8ff | 239 | * Initialize ADC. |
bogdanm | 0:9b334a45a8ff | 240 | * |
bogdanm | 0:9b334a45a8ff | 241 | * @details |
bogdanm | 0:9b334a45a8ff | 242 | * Initializes common parts for both single conversion and scan sequence. |
bogdanm | 0:9b334a45a8ff | 243 | * In addition, single and/or scan control configuration must be done, please |
bogdanm | 0:9b334a45a8ff | 244 | * refer to ADC_InitSingle() and ADC_InitScan() respectively. |
bogdanm | 0:9b334a45a8ff | 245 | * |
bogdanm | 0:9b334a45a8ff | 246 | * @note |
bogdanm | 0:9b334a45a8ff | 247 | * This function will stop any ongoing conversion. |
bogdanm | 0:9b334a45a8ff | 248 | * |
bogdanm | 0:9b334a45a8ff | 249 | * @param[in] adc |
bogdanm | 0:9b334a45a8ff | 250 | * Pointer to ADC peripheral register block. |
bogdanm | 0:9b334a45a8ff | 251 | * |
bogdanm | 0:9b334a45a8ff | 252 | * @param[in] init |
bogdanm | 0:9b334a45a8ff | 253 | * Pointer to ADC initialization structure. |
bogdanm | 0:9b334a45a8ff | 254 | ******************************************************************************/ |
bogdanm | 0:9b334a45a8ff | 255 | void ADC_Init(ADC_TypeDef *adc, const ADC_Init_TypeDef *init) |
bogdanm | 0:9b334a45a8ff | 256 | { |
bogdanm | 0:9b334a45a8ff | 257 | uint32_t tmp; |
bogdanm | 0:9b334a45a8ff | 258 | |
bogdanm | 0:9b334a45a8ff | 259 | EFM_ASSERT(ADC_REF_VALID(adc)); |
bogdanm | 0:9b334a45a8ff | 260 | |
bogdanm | 0:9b334a45a8ff | 261 | /* Make sure conversion is not in progress */ |
bogdanm | 0:9b334a45a8ff | 262 | adc->CMD = ADC_CMD_SINGLESTOP | ADC_CMD_SCANSTOP; |
bogdanm | 0:9b334a45a8ff | 263 | |
bogdanm | 0:9b334a45a8ff | 264 | tmp = ((uint32_t)(init->ovsRateSel) << _ADC_CTRL_OVSRSEL_SHIFT) | |
bogdanm | 0:9b334a45a8ff | 265 | (((uint32_t)(init->timebase) << _ADC_CTRL_TIMEBASE_SHIFT) & _ADC_CTRL_TIMEBASE_MASK) | |
bogdanm | 0:9b334a45a8ff | 266 | (((uint32_t)(init->prescale) << _ADC_CTRL_PRESC_SHIFT) & _ADC_CTRL_PRESC_MASK) | |
bogdanm | 0:9b334a45a8ff | 267 | ((uint32_t)(init->lpfMode) << _ADC_CTRL_LPFMODE_SHIFT) | |
bogdanm | 0:9b334a45a8ff | 268 | ((uint32_t)(init->warmUpMode) << _ADC_CTRL_WARMUPMODE_SHIFT); |
bogdanm | 0:9b334a45a8ff | 269 | |
bogdanm | 0:9b334a45a8ff | 270 | if (init->tailgate) |
bogdanm | 0:9b334a45a8ff | 271 | { |
bogdanm | 0:9b334a45a8ff | 272 | tmp |= ADC_CTRL_TAILGATE; |
bogdanm | 0:9b334a45a8ff | 273 | } |
bogdanm | 0:9b334a45a8ff | 274 | |
bogdanm | 0:9b334a45a8ff | 275 | adc->CTRL = tmp; |
bogdanm | 0:9b334a45a8ff | 276 | } |
bogdanm | 0:9b334a45a8ff | 277 | |
bogdanm | 0:9b334a45a8ff | 278 | |
bogdanm | 0:9b334a45a8ff | 279 | /***************************************************************************//** |
bogdanm | 0:9b334a45a8ff | 280 | * @brief |
bogdanm | 0:9b334a45a8ff | 281 | * Initialize ADC scan sequence. |
bogdanm | 0:9b334a45a8ff | 282 | * |
bogdanm | 0:9b334a45a8ff | 283 | * @details |
bogdanm | 0:9b334a45a8ff | 284 | * Please refer to ADC_Start() for starting scan sequence. |
bogdanm | 0:9b334a45a8ff | 285 | * |
bogdanm | 0:9b334a45a8ff | 286 | * When selecting an external reference, the gain and offset calibration |
bogdanm | 0:9b334a45a8ff | 287 | * must be set explicitly (CAL register). For other references, the |
bogdanm | 0:9b334a45a8ff | 288 | * calibration is updated with values defined during manufacturing. |
bogdanm | 0:9b334a45a8ff | 289 | * |
bogdanm | 0:9b334a45a8ff | 290 | * @note |
bogdanm | 0:9b334a45a8ff | 291 | * This function will stop any ongoing scan sequence. |
bogdanm | 0:9b334a45a8ff | 292 | * |
bogdanm | 0:9b334a45a8ff | 293 | * @param[in] adc |
bogdanm | 0:9b334a45a8ff | 294 | * Pointer to ADC peripheral register block. |
bogdanm | 0:9b334a45a8ff | 295 | * |
bogdanm | 0:9b334a45a8ff | 296 | * @param[in] init |
bogdanm | 0:9b334a45a8ff | 297 | * Pointer to ADC initialization structure. |
bogdanm | 0:9b334a45a8ff | 298 | ******************************************************************************/ |
bogdanm | 0:9b334a45a8ff | 299 | void ADC_InitScan(ADC_TypeDef *adc, const ADC_InitScan_TypeDef *init) |
bogdanm | 0:9b334a45a8ff | 300 | { |
bogdanm | 0:9b334a45a8ff | 301 | uint32_t tmp; |
bogdanm | 0:9b334a45a8ff | 302 | |
bogdanm | 0:9b334a45a8ff | 303 | EFM_ASSERT(ADC_REF_VALID(adc)); |
bogdanm | 0:9b334a45a8ff | 304 | |
bogdanm | 0:9b334a45a8ff | 305 | /* Make sure scan sequence is not in progress */ |
bogdanm | 0:9b334a45a8ff | 306 | adc->CMD = ADC_CMD_SCANSTOP; |
bogdanm | 0:9b334a45a8ff | 307 | |
bogdanm | 0:9b334a45a8ff | 308 | /* Load proper calibration data depending on selected reference */ |
bogdanm | 0:9b334a45a8ff | 309 | ADC_CalibrateLoadScan(adc, init->reference); |
bogdanm | 0:9b334a45a8ff | 310 | |
bogdanm | 0:9b334a45a8ff | 311 | tmp = ((uint32_t)(init->prsSel) << _ADC_SCANCTRL_PRSSEL_SHIFT) | |
bogdanm | 0:9b334a45a8ff | 312 | ((uint32_t)(init->acqTime) << _ADC_SCANCTRL_AT_SHIFT) | |
bogdanm | 0:9b334a45a8ff | 313 | ((uint32_t)(init->reference) << _ADC_SCANCTRL_REF_SHIFT) | |
bogdanm | 0:9b334a45a8ff | 314 | init->input | |
bogdanm | 0:9b334a45a8ff | 315 | ((uint32_t)(init->resolution) << _ADC_SCANCTRL_RES_SHIFT); |
bogdanm | 0:9b334a45a8ff | 316 | |
bogdanm | 0:9b334a45a8ff | 317 | if (init->prsEnable) |
bogdanm | 0:9b334a45a8ff | 318 | { |
bogdanm | 0:9b334a45a8ff | 319 | tmp |= ADC_SCANCTRL_PRSEN; |
bogdanm | 0:9b334a45a8ff | 320 | } |
bogdanm | 0:9b334a45a8ff | 321 | |
bogdanm | 0:9b334a45a8ff | 322 | if (init->leftAdjust) |
bogdanm | 0:9b334a45a8ff | 323 | { |
bogdanm | 0:9b334a45a8ff | 324 | tmp |= ADC_SCANCTRL_ADJ_LEFT; |
bogdanm | 0:9b334a45a8ff | 325 | } |
bogdanm | 0:9b334a45a8ff | 326 | |
bogdanm | 0:9b334a45a8ff | 327 | if (init->diff) |
bogdanm | 0:9b334a45a8ff | 328 | { |
bogdanm | 0:9b334a45a8ff | 329 | tmp |= ADC_SCANCTRL_DIFF; |
bogdanm | 0:9b334a45a8ff | 330 | } |
bogdanm | 0:9b334a45a8ff | 331 | |
bogdanm | 0:9b334a45a8ff | 332 | if (init->rep) |
bogdanm | 0:9b334a45a8ff | 333 | { |
bogdanm | 0:9b334a45a8ff | 334 | tmp |= ADC_SCANCTRL_REP; |
bogdanm | 0:9b334a45a8ff | 335 | } |
bogdanm | 0:9b334a45a8ff | 336 | |
bogdanm | 0:9b334a45a8ff | 337 | adc->SCANCTRL = tmp; |
bogdanm | 0:9b334a45a8ff | 338 | } |
bogdanm | 0:9b334a45a8ff | 339 | |
bogdanm | 0:9b334a45a8ff | 340 | |
bogdanm | 0:9b334a45a8ff | 341 | /***************************************************************************//** |
bogdanm | 0:9b334a45a8ff | 342 | * @brief |
bogdanm | 0:9b334a45a8ff | 343 | * Initialize single ADC sample conversion. |
bogdanm | 0:9b334a45a8ff | 344 | * |
bogdanm | 0:9b334a45a8ff | 345 | * @details |
bogdanm | 0:9b334a45a8ff | 346 | * Please refer to ADC_Start() for starting single conversion. |
bogdanm | 0:9b334a45a8ff | 347 | * |
bogdanm | 0:9b334a45a8ff | 348 | * When selecting an external reference, the gain and offset calibration |
bogdanm | 0:9b334a45a8ff | 349 | * must be set explicitly (CAL register). For other references, the |
bogdanm | 0:9b334a45a8ff | 350 | * calibration is updated with values defined during manufacturing. |
bogdanm | 0:9b334a45a8ff | 351 | * |
bogdanm | 0:9b334a45a8ff | 352 | * @note |
bogdanm | 0:9b334a45a8ff | 353 | * This function will stop any ongoing single conversion. |
bogdanm | 0:9b334a45a8ff | 354 | * |
bogdanm | 0:9b334a45a8ff | 355 | * @param[in] adc |
bogdanm | 0:9b334a45a8ff | 356 | * Pointer to ADC peripheral register block. |
bogdanm | 0:9b334a45a8ff | 357 | * |
bogdanm | 0:9b334a45a8ff | 358 | * @param[in] init |
bogdanm | 0:9b334a45a8ff | 359 | * Pointer to ADC initialization structure. |
bogdanm | 0:9b334a45a8ff | 360 | ******************************************************************************/ |
bogdanm | 0:9b334a45a8ff | 361 | void ADC_InitSingle(ADC_TypeDef *adc, const ADC_InitSingle_TypeDef *init) |
bogdanm | 0:9b334a45a8ff | 362 | { |
bogdanm | 0:9b334a45a8ff | 363 | uint32_t tmp; |
bogdanm | 0:9b334a45a8ff | 364 | |
bogdanm | 0:9b334a45a8ff | 365 | EFM_ASSERT(ADC_REF_VALID(adc)); |
bogdanm | 0:9b334a45a8ff | 366 | |
bogdanm | 0:9b334a45a8ff | 367 | /* Make sure single conversion is not in progress */ |
bogdanm | 0:9b334a45a8ff | 368 | adc->CMD = ADC_CMD_SINGLESTOP; |
bogdanm | 0:9b334a45a8ff | 369 | |
bogdanm | 0:9b334a45a8ff | 370 | /* Load proper calibration data depending on selected reference */ |
bogdanm | 0:9b334a45a8ff | 371 | ADC_CalibrateLoadSingle(adc, init->reference); |
bogdanm | 0:9b334a45a8ff | 372 | |
bogdanm | 0:9b334a45a8ff | 373 | tmp = ((uint32_t)(init->prsSel) << _ADC_SINGLECTRL_PRSSEL_SHIFT) | |
bogdanm | 0:9b334a45a8ff | 374 | ((uint32_t)(init->acqTime) << _ADC_SINGLECTRL_AT_SHIFT) | |
bogdanm | 0:9b334a45a8ff | 375 | ((uint32_t)(init->reference) << _ADC_SINGLECTRL_REF_SHIFT) | |
bogdanm | 0:9b334a45a8ff | 376 | ((uint32_t)(init->input) << _ADC_SINGLECTRL_INPUTSEL_SHIFT) | |
bogdanm | 0:9b334a45a8ff | 377 | ((uint32_t)(init->resolution) << _ADC_SINGLECTRL_RES_SHIFT); |
bogdanm | 0:9b334a45a8ff | 378 | |
bogdanm | 0:9b334a45a8ff | 379 | if (init->prsEnable) |
bogdanm | 0:9b334a45a8ff | 380 | { |
bogdanm | 0:9b334a45a8ff | 381 | tmp |= ADC_SINGLECTRL_PRSEN; |
bogdanm | 0:9b334a45a8ff | 382 | } |
bogdanm | 0:9b334a45a8ff | 383 | |
bogdanm | 0:9b334a45a8ff | 384 | if (init->leftAdjust) |
bogdanm | 0:9b334a45a8ff | 385 | { |
bogdanm | 0:9b334a45a8ff | 386 | tmp |= ADC_SINGLECTRL_ADJ_LEFT; |
bogdanm | 0:9b334a45a8ff | 387 | } |
bogdanm | 0:9b334a45a8ff | 388 | |
bogdanm | 0:9b334a45a8ff | 389 | if (init->diff) |
bogdanm | 0:9b334a45a8ff | 390 | { |
bogdanm | 0:9b334a45a8ff | 391 | tmp |= ADC_SINGLECTRL_DIFF; |
bogdanm | 0:9b334a45a8ff | 392 | } |
bogdanm | 0:9b334a45a8ff | 393 | |
bogdanm | 0:9b334a45a8ff | 394 | if (init->rep) |
bogdanm | 0:9b334a45a8ff | 395 | { |
bogdanm | 0:9b334a45a8ff | 396 | tmp |= ADC_SINGLECTRL_REP; |
bogdanm | 0:9b334a45a8ff | 397 | } |
bogdanm | 0:9b334a45a8ff | 398 | |
bogdanm | 0:9b334a45a8ff | 399 | adc->SINGLECTRL = tmp; |
bogdanm | 0:9b334a45a8ff | 400 | } |
bogdanm | 0:9b334a45a8ff | 401 | |
bogdanm | 0:9b334a45a8ff | 402 | |
bogdanm | 0:9b334a45a8ff | 403 | /***************************************************************************//** |
bogdanm | 0:9b334a45a8ff | 404 | * @brief |
bogdanm | 0:9b334a45a8ff | 405 | * Calculate prescaler value used to determine ADC clock. |
bogdanm | 0:9b334a45a8ff | 406 | * |
bogdanm | 0:9b334a45a8ff | 407 | * @details |
bogdanm | 0:9b334a45a8ff | 408 | * The ADC clock is given by: HFPERCLK / (prescale + 1). |
bogdanm | 0:9b334a45a8ff | 409 | * |
bogdanm | 0:9b334a45a8ff | 410 | * @param[in] adcFreq ADC frequency wanted. The frequency will automatically |
bogdanm | 0:9b334a45a8ff | 411 | * be adjusted to be within valid range according to reference manual. |
bogdanm | 0:9b334a45a8ff | 412 | * |
bogdanm | 0:9b334a45a8ff | 413 | * @param[in] hfperFreq Frequency in Hz of reference HFPER clock. Set to 0 to |
bogdanm | 0:9b334a45a8ff | 414 | * use currently defined HFPER clock setting. |
bogdanm | 0:9b334a45a8ff | 415 | * |
bogdanm | 0:9b334a45a8ff | 416 | * @return |
bogdanm | 0:9b334a45a8ff | 417 | * Prescaler value to use for ADC in order to achieve a clock value |
bogdanm | 0:9b334a45a8ff | 418 | * <= @p adcFreq. |
bogdanm | 0:9b334a45a8ff | 419 | ******************************************************************************/ |
bogdanm | 0:9b334a45a8ff | 420 | uint8_t ADC_PrescaleCalc(uint32_t adcFreq, uint32_t hfperFreq) |
bogdanm | 0:9b334a45a8ff | 421 | { |
bogdanm | 0:9b334a45a8ff | 422 | uint32_t ret; |
bogdanm | 0:9b334a45a8ff | 423 | |
bogdanm | 0:9b334a45a8ff | 424 | /* Make sure selected ADC clock is within valid range */ |
bogdanm | 0:9b334a45a8ff | 425 | if (adcFreq > ADC_MAX_CLOCK) |
bogdanm | 0:9b334a45a8ff | 426 | { |
bogdanm | 0:9b334a45a8ff | 427 | adcFreq = ADC_MAX_CLOCK; |
bogdanm | 0:9b334a45a8ff | 428 | } |
bogdanm | 0:9b334a45a8ff | 429 | else if (adcFreq < ADC_MIN_CLOCK) |
bogdanm | 0:9b334a45a8ff | 430 | { |
bogdanm | 0:9b334a45a8ff | 431 | adcFreq = ADC_MIN_CLOCK; |
bogdanm | 0:9b334a45a8ff | 432 | } |
bogdanm | 0:9b334a45a8ff | 433 | |
bogdanm | 0:9b334a45a8ff | 434 | /* Use current HFPER frequency? */ |
bogdanm | 0:9b334a45a8ff | 435 | if (!hfperFreq) |
bogdanm | 0:9b334a45a8ff | 436 | { |
bogdanm | 0:9b334a45a8ff | 437 | hfperFreq = CMU_ClockFreqGet(cmuClock_HFPER); |
bogdanm | 0:9b334a45a8ff | 438 | } |
bogdanm | 0:9b334a45a8ff | 439 | |
bogdanm | 0:9b334a45a8ff | 440 | ret = (hfperFreq + adcFreq - 1) / adcFreq; |
bogdanm | 0:9b334a45a8ff | 441 | if (ret) |
bogdanm | 0:9b334a45a8ff | 442 | { |
bogdanm | 0:9b334a45a8ff | 443 | ret--; |
bogdanm | 0:9b334a45a8ff | 444 | } |
bogdanm | 0:9b334a45a8ff | 445 | |
bogdanm | 0:9b334a45a8ff | 446 | return (uint8_t)ret; |
bogdanm | 0:9b334a45a8ff | 447 | } |
bogdanm | 0:9b334a45a8ff | 448 | |
bogdanm | 0:9b334a45a8ff | 449 | |
bogdanm | 0:9b334a45a8ff | 450 | /***************************************************************************//** |
bogdanm | 0:9b334a45a8ff | 451 | * @brief |
bogdanm | 0:9b334a45a8ff | 452 | * Reset ADC to same state as after a HW reset. |
bogdanm | 0:9b334a45a8ff | 453 | * |
bogdanm | 0:9b334a45a8ff | 454 | * @note |
bogdanm | 0:9b334a45a8ff | 455 | * The ROUTE register is NOT reset by this function, in order to allow for |
bogdanm | 0:9b334a45a8ff | 456 | * centralized setup of this feature. |
bogdanm | 0:9b334a45a8ff | 457 | * |
bogdanm | 0:9b334a45a8ff | 458 | * @param[in] adc |
bogdanm | 0:9b334a45a8ff | 459 | * Pointer to ADC peripheral register block. |
bogdanm | 0:9b334a45a8ff | 460 | ******************************************************************************/ |
bogdanm | 0:9b334a45a8ff | 461 | void ADC_Reset(ADC_TypeDef *adc) |
bogdanm | 0:9b334a45a8ff | 462 | { |
bogdanm | 0:9b334a45a8ff | 463 | /* Stop conversions, before resetting other registers. */ |
bogdanm | 0:9b334a45a8ff | 464 | adc->CMD = ADC_CMD_SINGLESTOP | ADC_CMD_SCANSTOP; |
bogdanm | 0:9b334a45a8ff | 465 | adc->SINGLECTRL = _ADC_SINGLECTRL_RESETVALUE; |
bogdanm | 0:9b334a45a8ff | 466 | adc->SCANCTRL = _ADC_SCANCTRL_RESETVALUE; |
bogdanm | 0:9b334a45a8ff | 467 | adc->CTRL = _ADC_CTRL_RESETVALUE; |
bogdanm | 0:9b334a45a8ff | 468 | adc->IEN = _ADC_IEN_RESETVALUE; |
bogdanm | 0:9b334a45a8ff | 469 | adc->IFC = _ADC_IFC_MASK; |
bogdanm | 0:9b334a45a8ff | 470 | adc->BIASPROG = _ADC_BIASPROG_RESETVALUE; |
bogdanm | 0:9b334a45a8ff | 471 | |
bogdanm | 0:9b334a45a8ff | 472 | /* Load calibration values for the 1V25 internal reference. */ |
bogdanm | 0:9b334a45a8ff | 473 | ADC_CalibrateLoadSingle(adc, adcRef1V25); |
bogdanm | 0:9b334a45a8ff | 474 | ADC_CalibrateLoadScan(adc, adcRef1V25); |
bogdanm | 0:9b334a45a8ff | 475 | |
bogdanm | 0:9b334a45a8ff | 476 | /* Do not reset route register, setting should be done independently */ |
bogdanm | 0:9b334a45a8ff | 477 | } |
bogdanm | 0:9b334a45a8ff | 478 | |
bogdanm | 0:9b334a45a8ff | 479 | |
bogdanm | 0:9b334a45a8ff | 480 | /***************************************************************************//** |
bogdanm | 0:9b334a45a8ff | 481 | * @brief |
bogdanm | 0:9b334a45a8ff | 482 | * Calculate timebase value in order to get a timebase providing at least 1us. |
bogdanm | 0:9b334a45a8ff | 483 | * |
bogdanm | 0:9b334a45a8ff | 484 | * @param[in] hfperFreq Frequency in Hz of reference HFPER clock. Set to 0 to |
bogdanm | 0:9b334a45a8ff | 485 | * use currently defined HFPER clock setting. |
bogdanm | 0:9b334a45a8ff | 486 | * |
bogdanm | 0:9b334a45a8ff | 487 | * @return |
bogdanm | 0:9b334a45a8ff | 488 | * Timebase value to use for ADC in order to achieve at least 1 us. |
bogdanm | 0:9b334a45a8ff | 489 | ******************************************************************************/ |
bogdanm | 0:9b334a45a8ff | 490 | uint8_t ADC_TimebaseCalc(uint32_t hfperFreq) |
bogdanm | 0:9b334a45a8ff | 491 | { |
bogdanm | 0:9b334a45a8ff | 492 | if (!hfperFreq) |
bogdanm | 0:9b334a45a8ff | 493 | { |
bogdanm | 0:9b334a45a8ff | 494 | hfperFreq = CMU_ClockFreqGet(cmuClock_HFPER); |
bogdanm | 0:9b334a45a8ff | 495 | |
bogdanm | 0:9b334a45a8ff | 496 | /* Just in case, make sure we get non-zero freq for below calculation */ |
bogdanm | 0:9b334a45a8ff | 497 | if (!hfperFreq) |
bogdanm | 0:9b334a45a8ff | 498 | { |
bogdanm | 0:9b334a45a8ff | 499 | hfperFreq = 1; |
bogdanm | 0:9b334a45a8ff | 500 | } |
bogdanm | 0:9b334a45a8ff | 501 | } |
bogdanm | 0:9b334a45a8ff | 502 | #if defined(_EFM32_GIANT_FAMILY) || defined(_EFM32_WONDER_FAMILY) |
bogdanm | 0:9b334a45a8ff | 503 | /* Handle errata on Giant Gecko, max TIMEBASE is 5 bits wide or max 0x1F */ |
bogdanm | 0:9b334a45a8ff | 504 | /* cycles. This will give a warmp up time of e.g. 0.645us, not the */ |
bogdanm | 0:9b334a45a8ff | 505 | /* required 1us when operating at 48MHz. One must also increase acqTime */ |
bogdanm | 0:9b334a45a8ff | 506 | /* to compensate for the missing clock cycles, adding up to 1us in total.*/ |
bogdanm | 0:9b334a45a8ff | 507 | /* See reference manual for details. */ |
bogdanm | 0:9b334a45a8ff | 508 | if( hfperFreq > 32000000 ) |
bogdanm | 0:9b334a45a8ff | 509 | { |
bogdanm | 0:9b334a45a8ff | 510 | hfperFreq = 32000000; |
bogdanm | 0:9b334a45a8ff | 511 | } |
bogdanm | 0:9b334a45a8ff | 512 | #endif |
bogdanm | 0:9b334a45a8ff | 513 | /* Determine number of HFPERCLK cycle >= 1us */ |
bogdanm | 0:9b334a45a8ff | 514 | hfperFreq += 999999; |
bogdanm | 0:9b334a45a8ff | 515 | hfperFreq /= 1000000; |
bogdanm | 0:9b334a45a8ff | 516 | |
bogdanm | 0:9b334a45a8ff | 517 | /* Return timebase value (N+1 format) */ |
bogdanm | 0:9b334a45a8ff | 518 | return (uint8_t)(hfperFreq - 1); |
bogdanm | 0:9b334a45a8ff | 519 | } |
bogdanm | 0:9b334a45a8ff | 520 | |
bogdanm | 0:9b334a45a8ff | 521 | |
bogdanm | 0:9b334a45a8ff | 522 | /** @} (end addtogroup ADC) */ |
bogdanm | 0:9b334a45a8ff | 523 | /** @} (end addtogroup EM_Library) */ |
bogdanm | 0:9b334a45a8ff | 524 | #endif /* defined(ADC_COUNT) && (ADC_COUNT > 0) */ |