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targets/TARGET_ONSEMI/TARGET_NCS36510/analogin_api.c@178:c26431f84b0d, 2017-11-09 (annotated)
- Committer:
- amithy
- Date:
- Thu Nov 09 22:14:37 2017 +0000
- Revision:
- 178:c26431f84b0d
- Parent:
- 153:fa9ff456f731
- Child:
- 161:2cc1468da177
test export
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
<> | 144:ef7eb2e8f9f7 | 1 | /** |
<> | 144:ef7eb2e8f9f7 | 2 | ****************************************************************************** |
<> | 144:ef7eb2e8f9f7 | 3 | * @file adc_sar.c |
<> | 144:ef7eb2e8f9f7 | 4 | * @brief Implementation of a SAR ADC driver |
<> | 144:ef7eb2e8f9f7 | 5 | * @internal |
<> | 144:ef7eb2e8f9f7 | 6 | * @author ON Semiconductor |
<> | 144:ef7eb2e8f9f7 | 7 | * $Rev: |
<> | 144:ef7eb2e8f9f7 | 8 | * $Date: |
<> | 144:ef7eb2e8f9f7 | 9 | ****************************************************************************** |
<> | 147:30b64687e01f | 10 | * Copyright 2016 Semiconductor Components Industries LLC (d/b/a ON Semiconductor). |
<> | 147:30b64687e01f | 11 | * All rights reserved. This software and/or documentation is licensed by ON Semiconductor |
<> | 147:30b64687e01f | 12 | * under limited terms and conditions. The terms and conditions pertaining to the software |
<> | 147:30b64687e01f | 13 | * and/or documentation are available at http://www.onsemi.com/site/pdf/ONSEMI_T&C.pdf |
<> | 147:30b64687e01f | 14 | * (ON Semiconductor Standard Terms and Conditions of Sale, Section 8 Software) and |
<> | 147:30b64687e01f | 15 | * if applicable the software license agreement. Do not use this software and/or |
<> | 147:30b64687e01f | 16 | * documentation unless you have carefully read and you agree to the limited terms and |
<> | 147:30b64687e01f | 17 | * conditions. By using this software and/or documentation, you agree to the limited |
<> | 147:30b64687e01f | 18 | * terms and conditions. |
<> | 144:ef7eb2e8f9f7 | 19 | * |
<> | 144:ef7eb2e8f9f7 | 20 | * THIS SOFTWARE IS PROVIDED "AS IS". NO WARRANTIES, WHETHER EXPRESS, IMPLIED |
<> | 144:ef7eb2e8f9f7 | 21 | * OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF |
<> | 144:ef7eb2e8f9f7 | 22 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. |
<> | 144:ef7eb2e8f9f7 | 23 | * ON SEMICONDUCTOR SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, |
<> | 144:ef7eb2e8f9f7 | 24 | * INCIDENTAL, OR CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER. |
<> | 144:ef7eb2e8f9f7 | 25 | * @endinternal |
<> | 144:ef7eb2e8f9f7 | 26 | * |
<> | 144:ef7eb2e8f9f7 | 27 | * @ingroup adc_sar |
<> | 144:ef7eb2e8f9f7 | 28 | * |
<> | 144:ef7eb2e8f9f7 | 29 | * @details |
<> | 144:ef7eb2e8f9f7 | 30 | * <p> |
<> | 144:ef7eb2e8f9f7 | 31 | * </p> |
<> | 144:ef7eb2e8f9f7 | 32 | * |
<> | 144:ef7eb2e8f9f7 | 33 | */ |
<> | 144:ef7eb2e8f9f7 | 34 | |
<> | 144:ef7eb2e8f9f7 | 35 | #include "device.h" |
<> | 144:ef7eb2e8f9f7 | 36 | #include "analogin_api.h" |
<> | 144:ef7eb2e8f9f7 | 37 | #include "PeripheralPins.h" |
<> | 144:ef7eb2e8f9f7 | 38 | #include "mbed_assert.h" |
<> | 144:ef7eb2e8f9f7 | 39 | #include "clock.h" |
<> | 144:ef7eb2e8f9f7 | 40 | #include "adc_sar.h" |
<> | 144:ef7eb2e8f9f7 | 41 | |
<> | 144:ef7eb2e8f9f7 | 42 | #if DEVICE_ANALOGIN |
<> | 144:ef7eb2e8f9f7 | 43 | |
<> | 144:ef7eb2e8f9f7 | 44 | /** |
<> | 144:ef7eb2e8f9f7 | 45 | * \defgroup hal_analogin Analogin hal functions |
<> | 144:ef7eb2e8f9f7 | 46 | * @{ |
<> | 144:ef7eb2e8f9f7 | 47 | */ |
<> | 144:ef7eb2e8f9f7 | 48 | |
<> | 144:ef7eb2e8f9f7 | 49 | /** Initialize the analogin peripheral |
<> | 144:ef7eb2e8f9f7 | 50 | * |
<> | 144:ef7eb2e8f9f7 | 51 | * Configures the pin used by analogin. |
<> | 144:ef7eb2e8f9f7 | 52 | * @param obj The analogin object to initialize |
<> | 144:ef7eb2e8f9f7 | 53 | * @param pin The analogin pin name |
<> | 144:ef7eb2e8f9f7 | 54 | */ |
<> | 144:ef7eb2e8f9f7 | 55 | void analogin_init(analogin_t *obj, PinName pin) |
<> | 144:ef7eb2e8f9f7 | 56 | { |
<> | 144:ef7eb2e8f9f7 | 57 | CLOCK_ENABLE(CLOCK_ADC); |
<> | 144:ef7eb2e8f9f7 | 58 | ADCName adc; |
<> | 144:ef7eb2e8f9f7 | 59 | uint8_t adc_pin = 0; |
<> | 144:ef7eb2e8f9f7 | 60 | |
<> | 144:ef7eb2e8f9f7 | 61 | adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC); |
<> | 144:ef7eb2e8f9f7 | 62 | MBED_ASSERT(adc != (ADCName)NC); |
<> | 144:ef7eb2e8f9f7 | 63 | |
<> | 144:ef7eb2e8f9f7 | 64 | obj->adcReg = (AdcReg_pt)adc; |
<> | 144:ef7eb2e8f9f7 | 65 | obj->pin = pin; |
<> | 144:ef7eb2e8f9f7 | 66 | obj->pinFlag = 1; |
<> | 153:fa9ff456f731 | 67 | obj->ADC_Offset_Value = TRIMREG->ADC_OFFSET_TRIM; |
<> | 153:fa9ff456f731 | 68 | |
<> | 144:ef7eb2e8f9f7 | 69 | switch (pin) { |
<> | 144:ef7eb2e8f9f7 | 70 | case A0: |
<> | 144:ef7eb2e8f9f7 | 71 | adc_pin=0; |
<> | 144:ef7eb2e8f9f7 | 72 | break; |
<> | 144:ef7eb2e8f9f7 | 73 | case A1: |
<> | 144:ef7eb2e8f9f7 | 74 | adc_pin = 1; |
<> | 144:ef7eb2e8f9f7 | 75 | break; |
<> | 144:ef7eb2e8f9f7 | 76 | case A2: |
<> | 144:ef7eb2e8f9f7 | 77 | adc_pin = 2; |
<> | 144:ef7eb2e8f9f7 | 78 | break; |
<> | 144:ef7eb2e8f9f7 | 79 | case A3: |
<> | 144:ef7eb2e8f9f7 | 80 | adc_pin = 3; |
<> | 144:ef7eb2e8f9f7 | 81 | break; |
<> | 144:ef7eb2e8f9f7 | 82 | default: |
<> | 144:ef7eb2e8f9f7 | 83 | break; |
<> | 144:ef7eb2e8f9f7 | 84 | } |
<> | 144:ef7eb2e8f9f7 | 85 | |
<> | 144:ef7eb2e8f9f7 | 86 | /* If no config parameters are passed on; assume default value */ |
<> | 144:ef7eb2e8f9f7 | 87 | if (obj->adcConf == Null) { |
<> | 144:ef7eb2e8f9f7 | 88 | /* Single sample, absolute conversion, scale = 1 */ |
<> | 144:ef7eb2e8f9f7 | 89 | obj->adcReg->CONTROL.WORD = ((0 << ADC_CONTROL_MODE_BIT_POS) | |
<> | 144:ef7eb2e8f9f7 | 90 | (1 << ADC_CONTROL_MEASTYPE_BIT_POS) | |
<> | 144:ef7eb2e8f9f7 | 91 | (1 << ADC_CONTROL_INPUTSCALE_BIT_POS) | |
<> | 144:ef7eb2e8f9f7 | 92 | (((uint8_t)adc_pin) << ADC_CONTROL_MEAS_CH_BIT_POS)); |
<> | 144:ef7eb2e8f9f7 | 93 | |
<> | 144:ef7eb2e8f9f7 | 94 | /* Prescaler enabled; set to 7 */ |
<> | 144:ef7eb2e8f9f7 | 95 | obj->adcReg->PRESCALE.WORD = ((True << ADC_PRESCALE_EN_BIT_POS) | |
<> | 144:ef7eb2e8f9f7 | 96 | (7 << ADC_PRESCALE_VAL_BIT_POS)); /* ADC clock = 32MHz/(Prescale + 1) */ |
<> | 144:ef7eb2e8f9f7 | 97 | |
<> | 144:ef7eb2e8f9f7 | 98 | obj->adcReg->DELAY.WORD = ((0x34 << ADC_DELAY_SAMPLE_RATE_BIT_POS) | /** 25 uS Sets the sample rate in units of PCLKperiod * (Prescale + 1). */ |
<> | 144:ef7eb2e8f9f7 | 99 | (0x05 << ADC_DELAY_WARMUP_BIT_POS) | /** 12.5 uS Sets the measure time in units of PCLKperiod * (Prescale + 1). */ |
<> | 144:ef7eb2e8f9f7 | 100 | (0x1A << ADC_DELAY_SAMPLE_TIME_BIT_POS)); /** 2.5 uS Sets the warm-up time in units of PCLKperiod * (Prescale + 1). */ |
<> | 144:ef7eb2e8f9f7 | 101 | |
<> | 144:ef7eb2e8f9f7 | 102 | obj->adcReg->IR = 0; /** No interrupt generated */ |
<> | 144:ef7eb2e8f9f7 | 103 | } else { |
<> | 144:ef7eb2e8f9f7 | 104 | obj->adcConf->convCh = adc_pin; |
<> | 144:ef7eb2e8f9f7 | 105 | |
<> | 144:ef7eb2e8f9f7 | 106 | /* ADC register settings */ |
<> | 144:ef7eb2e8f9f7 | 107 | if((obj->adcConf->measurementType) == ADC_RELATIVE_MEAS) { |
<> | 144:ef7eb2e8f9f7 | 108 | obj->adcReg->CONTROL.WORD = ((obj->adcConf->mode << ADC_CONTROL_MODE_BIT_POS) | |
<> | 144:ef7eb2e8f9f7 | 109 | (obj->adcConf->measurementType << ADC_CONTROL_MEASTYPE_BIT_POS) | |
<> | 144:ef7eb2e8f9f7 | 110 | (obj->adcConf->inputScale << ADC_CONTROL_INPUTSCALE_BIT_POS) | |
<> | 144:ef7eb2e8f9f7 | 111 | (obj->adcConf->convCh << ADC_CONTROL_MEAS_CH_BIT_POS) | |
<> | 144:ef7eb2e8f9f7 | 112 | (obj->adcConf->referenceCh << ADC_CONTROL_REF_CH_BIT_POS)); |
<> | 144:ef7eb2e8f9f7 | 113 | } else { |
<> | 144:ef7eb2e8f9f7 | 114 | obj->adcReg->CONTROL.WORD = ((obj->adcConf->mode << ADC_CONTROL_MODE_BIT_POS) | |
<> | 144:ef7eb2e8f9f7 | 115 | (obj->adcConf->measurementType << ADC_CONTROL_MEASTYPE_BIT_POS) | |
<> | 144:ef7eb2e8f9f7 | 116 | (obj->adcConf->inputScale << ADC_CONTROL_INPUTSCALE_BIT_POS) | |
<> | 144:ef7eb2e8f9f7 | 117 | (obj->adcConf->convCh << ADC_CONTROL_MEAS_CH_BIT_POS)); |
<> | 144:ef7eb2e8f9f7 | 118 | } |
<> | 144:ef7eb2e8f9f7 | 119 | |
<> | 144:ef7eb2e8f9f7 | 120 | obj->adcReg->PRESCALE.WORD = ((True << ADC_PRESCALE_EN_BIT_POS) | |
<> | 144:ef7eb2e8f9f7 | 121 | (obj->adcConf->PrescaleVal << ADC_PRESCALE_VAL_BIT_POS)); /* ADC clock = 32MHz/(Prescale + 1) */ |
<> | 144:ef7eb2e8f9f7 | 122 | |
<> | 144:ef7eb2e8f9f7 | 123 | obj->adcReg->DELAY.WORD = ((obj->adcConf->samplingRate << ADC_DELAY_SAMPLE_RATE_BIT_POS) | /** 25 uS Sets the sample rate in units of PCLKperiod * (Prescale + 1). */ |
<> | 144:ef7eb2e8f9f7 | 124 | (obj->adcConf->WarmUpTime << ADC_DELAY_WARMUP_BIT_POS) | /** 12.5 uS Sets the measure time in units of PCLKperiod * (Prescale + 1). */ |
<> | 144:ef7eb2e8f9f7 | 125 | (obj->adcConf->samplingTime << ADC_DELAY_SAMPLE_TIME_BIT_POS)); /** 2.5 uS Sets the warm-up time in units of PCLKperiod * (Prescale + 1). */ |
<> | 144:ef7eb2e8f9f7 | 126 | |
<> | 144:ef7eb2e8f9f7 | 127 | obj->adcReg->IR = obj->adcConf->interruptConfig; /** Interrupt setting */ |
<> | 144:ef7eb2e8f9f7 | 128 | } |
<> | 144:ef7eb2e8f9f7 | 129 | |
<> | 144:ef7eb2e8f9f7 | 130 | /* Enable interrupt */ |
<> | 144:ef7eb2e8f9f7 | 131 | NVIC_ClearPendingIRQ(Adc_IRQn); |
<> | 144:ef7eb2e8f9f7 | 132 | NVIC_EnableIRQ(Adc_IRQn); |
<> | 144:ef7eb2e8f9f7 | 133 | } |
<> | 144:ef7eb2e8f9f7 | 134 | |
<> | 144:ef7eb2e8f9f7 | 135 | /** Read the input voltage, represented as a float in the range [0.0, 1.0] |
<> | 144:ef7eb2e8f9f7 | 136 | * |
<> | 144:ef7eb2e8f9f7 | 137 | * @param obj The analogin object |
<> | 144:ef7eb2e8f9f7 | 138 | * @return A floating value representing the current input voltage |
<> | 144:ef7eb2e8f9f7 | 139 | */ |
<> | 144:ef7eb2e8f9f7 | 140 | float analogin_read(analogin_t *obj) |
<> | 144:ef7eb2e8f9f7 | 141 | { |
<> | 144:ef7eb2e8f9f7 | 142 | float retVal = 0.0; |
<> | 144:ef7eb2e8f9f7 | 143 | uint16_t value = analogin_read_u16(obj); |
<> | 144:ef7eb2e8f9f7 | 144 | retVal = (float)value * (1.0f / (float)0x03FF); |
<> | 144:ef7eb2e8f9f7 | 145 | return(retVal); |
<> | 144:ef7eb2e8f9f7 | 146 | } |
<> | 144:ef7eb2e8f9f7 | 147 | |
<> | 144:ef7eb2e8f9f7 | 148 | /** Read the value from analogin pin, represented as an unsigned 16bit value |
<> | 144:ef7eb2e8f9f7 | 149 | * |
<> | 144:ef7eb2e8f9f7 | 150 | * @param obj The analogin object |
<> | 144:ef7eb2e8f9f7 | 151 | * @return An unsigned 16bit value representing the current input voltage |
<> | 144:ef7eb2e8f9f7 | 152 | */ |
<> | 144:ef7eb2e8f9f7 | 153 | uint16_t analogin_read_u16(analogin_t *obj) |
<> | 144:ef7eb2e8f9f7 | 154 | { |
<> | 144:ef7eb2e8f9f7 | 155 | uint16_t adcData = 0; |
<> | 144:ef7eb2e8f9f7 | 156 | uint8_t adc_pin = 0; |
<> | 144:ef7eb2e8f9f7 | 157 | |
<> | 144:ef7eb2e8f9f7 | 158 | CLOCK_ENABLE(CLOCK_ADC); |
<> | 144:ef7eb2e8f9f7 | 159 | |
<> | 144:ef7eb2e8f9f7 | 160 | if (obj->pinFlag) { |
<> | 144:ef7eb2e8f9f7 | 161 | switch (obj->pin) { |
<> | 144:ef7eb2e8f9f7 | 162 | case A0: |
<> | 144:ef7eb2e8f9f7 | 163 | adc_pin=0; |
<> | 144:ef7eb2e8f9f7 | 164 | break; |
<> | 144:ef7eb2e8f9f7 | 165 | case A1: |
<> | 144:ef7eb2e8f9f7 | 166 | adc_pin = 1; |
<> | 144:ef7eb2e8f9f7 | 167 | break; |
<> | 144:ef7eb2e8f9f7 | 168 | case A2: |
<> | 144:ef7eb2e8f9f7 | 169 | adc_pin = 2; |
<> | 144:ef7eb2e8f9f7 | 170 | break; |
<> | 144:ef7eb2e8f9f7 | 171 | case A3: |
<> | 144:ef7eb2e8f9f7 | 172 | adc_pin = 3; |
<> | 144:ef7eb2e8f9f7 | 173 | break; |
<> | 144:ef7eb2e8f9f7 | 174 | default: |
<> | 144:ef7eb2e8f9f7 | 175 | break; |
<> | 144:ef7eb2e8f9f7 | 176 | } |
<> | 144:ef7eb2e8f9f7 | 177 | |
<> | 144:ef7eb2e8f9f7 | 178 | /* Re initialize the pin configured for ADC read */ |
<> | 144:ef7eb2e8f9f7 | 179 | obj->adcReg->CONTROL.BITS.CONV_CH = adc_pin; |
<> | 144:ef7eb2e8f9f7 | 180 | } |
<> | 144:ef7eb2e8f9f7 | 181 | |
<> | 144:ef7eb2e8f9f7 | 182 | obj->adcReg->CONTROL.BITS.START_CONV=1; /* Start The Conversion */ |
<> | 144:ef7eb2e8f9f7 | 183 | |
<> | 144:ef7eb2e8f9f7 | 184 | while((uint32_t)(obj->adcReg->STATUS)!=(uint32_t)1) { |
<> | 144:ef7eb2e8f9f7 | 185 | } |
<> | 144:ef7eb2e8f9f7 | 186 | adcData =(uint16_t)(obj->adcReg->DATA); |
<> | 153:fa9ff456f731 | 187 | |
<> | 153:fa9ff456f731 | 188 | /* Offset the ADC data with trim value */ |
<> | 153:fa9ff456f731 | 189 | if (obj->ADC_Offset_Value != 0xFFFFFFFF) { |
<> | 153:fa9ff456f731 | 190 | |
<> | 153:fa9ff456f731 | 191 | if(adcData >= obj->ADC_Offset_Value) { |
<> | 153:fa9ff456f731 | 192 | adcData -= obj->ADC_Offset_Value; |
<> | 153:fa9ff456f731 | 193 | } |
<> | 153:fa9ff456f731 | 194 | } |
<> | 144:ef7eb2e8f9f7 | 195 | |
<> | 144:ef7eb2e8f9f7 | 196 | return(adcData); |
<> | 144:ef7eb2e8f9f7 | 197 | } |
<> | 144:ef7eb2e8f9f7 | 198 | |
<> | 144:ef7eb2e8f9f7 | 199 | #endif // DEVICE_ANALOGIN |
<> | 144:ef7eb2e8f9f7 | 200 |