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targets/hal/TARGET_ONSEMI/TARGET_NCS36510/analogin_api.c@144:ef7eb2e8f9f7, 2016-09-02 (annotated)

Committer:
<>
Date:
Fri Sep 02 15:07:44 2016 +0100
Revision:
144:ef7eb2e8f9f7
Child:
147:30b64687e01f
This updates the lib to the mbed lib v125

Who changed what in which revision?

UserRevisionLine numberNew 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 ******************************************************************************
<> 144:ef7eb2e8f9f7 10 * @copyright (c) 2012 ON Semiconductor. All rights reserved.
<> 144:ef7eb2e8f9f7 11 * ON Semiconductor is supplying this software for use with ON Semiconductor
<> 144:ef7eb2e8f9f7 12 * processor based microcontrollers only.
<> 144:ef7eb2e8f9f7 13 *
<> 144:ef7eb2e8f9f7 14 * THIS SOFTWARE IS PROVIDED "AS IS". NO WARRANTIES, WHETHER EXPRESS, IMPLIED
<> 144:ef7eb2e8f9f7 15 * OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF
<> 144:ef7eb2e8f9f7 16 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE.
<> 144:ef7eb2e8f9f7 17 * ON SEMICONDUCTOR SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL,
<> 144:ef7eb2e8f9f7 18 * INCIDENTAL, OR CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.
<> 144:ef7eb2e8f9f7 19 * @endinternal
<> 144:ef7eb2e8f9f7 20 *
<> 144:ef7eb2e8f9f7 21 * @ingroup adc_sar
<> 144:ef7eb2e8f9f7 22 *
<> 144:ef7eb2e8f9f7 23 * @details
<> 144:ef7eb2e8f9f7 24 * <p>
<> 144:ef7eb2e8f9f7 25 * </p>
<> 144:ef7eb2e8f9f7 26 *
<> 144:ef7eb2e8f9f7 27 */
<> 144:ef7eb2e8f9f7 28
<> 144:ef7eb2e8f9f7 29 #include "device.h"
<> 144:ef7eb2e8f9f7 30 #include "analogin_api.h"
<> 144:ef7eb2e8f9f7 31 #include "PeripheralPins.h"
<> 144:ef7eb2e8f9f7 32 #include "mbed_assert.h"
<> 144:ef7eb2e8f9f7 33 #include "clock.h"
<> 144:ef7eb2e8f9f7 34 #include "adc_sar.h"
<> 144:ef7eb2e8f9f7 35
<> 144:ef7eb2e8f9f7 36 #if DEVICE_ANALOGIN
<> 144:ef7eb2e8f9f7 37
<> 144:ef7eb2e8f9f7 38 /**
<> 144:ef7eb2e8f9f7 39 * \defgroup hal_analogin Analogin hal functions
<> 144:ef7eb2e8f9f7 40 * @{
<> 144:ef7eb2e8f9f7 41 */
<> 144:ef7eb2e8f9f7 42
<> 144:ef7eb2e8f9f7 43 /** Initialize the analogin peripheral
<> 144:ef7eb2e8f9f7 44 *
<> 144:ef7eb2e8f9f7 45 * Configures the pin used by analogin.
<> 144:ef7eb2e8f9f7 46 * @param obj The analogin object to initialize
<> 144:ef7eb2e8f9f7 47 * @param pin The analogin pin name
<> 144:ef7eb2e8f9f7 48 */
<> 144:ef7eb2e8f9f7 49 void analogin_init(analogin_t *obj, PinName pin)
<> 144:ef7eb2e8f9f7 50 {
<> 144:ef7eb2e8f9f7 51 CLOCK_ENABLE(CLOCK_ADC);
<> 144:ef7eb2e8f9f7 52 ADCName adc;
<> 144:ef7eb2e8f9f7 53 uint8_t adc_pin = 0;
<> 144:ef7eb2e8f9f7 54
<> 144:ef7eb2e8f9f7 55 adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
<> 144:ef7eb2e8f9f7 56 MBED_ASSERT(adc != (ADCName)NC);
<> 144:ef7eb2e8f9f7 57
<> 144:ef7eb2e8f9f7 58 obj->adcReg = (AdcReg_pt)adc;
<> 144:ef7eb2e8f9f7 59 obj->pin = pin;
<> 144:ef7eb2e8f9f7 60 obj->pinFlag = 1;
<> 144:ef7eb2e8f9f7 61
<> 144:ef7eb2e8f9f7 62 switch (pin) {
<> 144:ef7eb2e8f9f7 63 case A0:
<> 144:ef7eb2e8f9f7 64 adc_pin=0;
<> 144:ef7eb2e8f9f7 65 break;
<> 144:ef7eb2e8f9f7 66 case A1:
<> 144:ef7eb2e8f9f7 67 adc_pin = 1;
<> 144:ef7eb2e8f9f7 68 break;
<> 144:ef7eb2e8f9f7 69 case A2:
<> 144:ef7eb2e8f9f7 70 adc_pin = 2;
<> 144:ef7eb2e8f9f7 71 break;
<> 144:ef7eb2e8f9f7 72 case A3:
<> 144:ef7eb2e8f9f7 73 adc_pin = 3;
<> 144:ef7eb2e8f9f7 74 break;
<> 144:ef7eb2e8f9f7 75 default:
<> 144:ef7eb2e8f9f7 76 break;
<> 144:ef7eb2e8f9f7 77 }
<> 144:ef7eb2e8f9f7 78
<> 144:ef7eb2e8f9f7 79 /* If no config parameters are passed on; assume default value */
<> 144:ef7eb2e8f9f7 80 if (obj->adcConf == Null) {
<> 144:ef7eb2e8f9f7 81 /* Single sample, absolute conversion, scale = 1 */
<> 144:ef7eb2e8f9f7 82 obj->adcReg->CONTROL.WORD = ((0 << ADC_CONTROL_MODE_BIT_POS) |
<> 144:ef7eb2e8f9f7 83 (1 << ADC_CONTROL_MEASTYPE_BIT_POS) |
<> 144:ef7eb2e8f9f7 84 (1 << ADC_CONTROL_INPUTSCALE_BIT_POS) |
<> 144:ef7eb2e8f9f7 85 (((uint8_t)adc_pin) << ADC_CONTROL_MEAS_CH_BIT_POS));
<> 144:ef7eb2e8f9f7 86
<> 144:ef7eb2e8f9f7 87 /* Prescaler enabled; set to 7 */
<> 144:ef7eb2e8f9f7 88 obj->adcReg->PRESCALE.WORD = ((True << ADC_PRESCALE_EN_BIT_POS) |
<> 144:ef7eb2e8f9f7 89 (7 << ADC_PRESCALE_VAL_BIT_POS)); /* ADC clock = 32MHz/(Prescale + 1) */
<> 144:ef7eb2e8f9f7 90
<> 144:ef7eb2e8f9f7 91 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 92 (0x05 << ADC_DELAY_WARMUP_BIT_POS) | /** 12.5 uS Sets the measure time in units of PCLKperiod * (Prescale + 1). */
<> 144:ef7eb2e8f9f7 93 (0x1A << ADC_DELAY_SAMPLE_TIME_BIT_POS)); /** 2.5 uS Sets the warm-up time in units of PCLKperiod * (Prescale + 1). */
<> 144:ef7eb2e8f9f7 94
<> 144:ef7eb2e8f9f7 95 obj->adcReg->IR = 0; /** No interrupt generated */
<> 144:ef7eb2e8f9f7 96 } else {
<> 144:ef7eb2e8f9f7 97 obj->adcConf->convCh = adc_pin;
<> 144:ef7eb2e8f9f7 98
<> 144:ef7eb2e8f9f7 99 /* ADC register settings */
<> 144:ef7eb2e8f9f7 100 if((obj->adcConf->measurementType) == ADC_RELATIVE_MEAS) {
<> 144:ef7eb2e8f9f7 101 obj->adcReg->CONTROL.WORD = ((obj->adcConf->mode << ADC_CONTROL_MODE_BIT_POS) |
<> 144:ef7eb2e8f9f7 102 (obj->adcConf->measurementType << ADC_CONTROL_MEASTYPE_BIT_POS) |
<> 144:ef7eb2e8f9f7 103 (obj->adcConf->inputScale << ADC_CONTROL_INPUTSCALE_BIT_POS) |
<> 144:ef7eb2e8f9f7 104 (obj->adcConf->convCh << ADC_CONTROL_MEAS_CH_BIT_POS) |
<> 144:ef7eb2e8f9f7 105 (obj->adcConf->referenceCh << ADC_CONTROL_REF_CH_BIT_POS));
<> 144:ef7eb2e8f9f7 106 } else {
<> 144:ef7eb2e8f9f7 107 obj->adcReg->CONTROL.WORD = ((obj->adcConf->mode << ADC_CONTROL_MODE_BIT_POS) |
<> 144:ef7eb2e8f9f7 108 (obj->adcConf->measurementType << ADC_CONTROL_MEASTYPE_BIT_POS) |
<> 144:ef7eb2e8f9f7 109 (obj->adcConf->inputScale << ADC_CONTROL_INPUTSCALE_BIT_POS) |
<> 144:ef7eb2e8f9f7 110 (obj->adcConf->convCh << ADC_CONTROL_MEAS_CH_BIT_POS));
<> 144:ef7eb2e8f9f7 111 }
<> 144:ef7eb2e8f9f7 112
<> 144:ef7eb2e8f9f7 113 obj->adcReg->PRESCALE.WORD = ((True << ADC_PRESCALE_EN_BIT_POS) |
<> 144:ef7eb2e8f9f7 114 (obj->adcConf->PrescaleVal << ADC_PRESCALE_VAL_BIT_POS)); /* ADC clock = 32MHz/(Prescale + 1) */
<> 144:ef7eb2e8f9f7 115
<> 144:ef7eb2e8f9f7 116 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 117 (obj->adcConf->WarmUpTime << ADC_DELAY_WARMUP_BIT_POS) | /** 12.5 uS Sets the measure time in units of PCLKperiod * (Prescale + 1). */
<> 144:ef7eb2e8f9f7 118 (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 119
<> 144:ef7eb2e8f9f7 120 obj->adcReg->IR = obj->adcConf->interruptConfig; /** Interrupt setting */
<> 144:ef7eb2e8f9f7 121 }
<> 144:ef7eb2e8f9f7 122
<> 144:ef7eb2e8f9f7 123 /* Enable interrupt */
<> 144:ef7eb2e8f9f7 124 NVIC_ClearPendingIRQ(Adc_IRQn);
<> 144:ef7eb2e8f9f7 125 NVIC_EnableIRQ(Adc_IRQn);
<> 144:ef7eb2e8f9f7 126 }
<> 144:ef7eb2e8f9f7 127
<> 144:ef7eb2e8f9f7 128 /** Read the input voltage, represented as a float in the range [0.0, 1.0]
<> 144:ef7eb2e8f9f7 129 *
<> 144:ef7eb2e8f9f7 130 * @param obj The analogin object
<> 144:ef7eb2e8f9f7 131 * @return A floating value representing the current input voltage
<> 144:ef7eb2e8f9f7 132 */
<> 144:ef7eb2e8f9f7 133 float analogin_read(analogin_t *obj)
<> 144:ef7eb2e8f9f7 134 {
<> 144:ef7eb2e8f9f7 135 float retVal = 0.0;
<> 144:ef7eb2e8f9f7 136 uint16_t value = analogin_read_u16(obj);
<> 144:ef7eb2e8f9f7 137 retVal = (float)value * (1.0f / (float)0x03FF);
<> 144:ef7eb2e8f9f7 138 return(retVal);
<> 144:ef7eb2e8f9f7 139 }
<> 144:ef7eb2e8f9f7 140
<> 144:ef7eb2e8f9f7 141 /** Read the value from analogin pin, represented as an unsigned 16bit value
<> 144:ef7eb2e8f9f7 142 *
<> 144:ef7eb2e8f9f7 143 * @param obj The analogin object
<> 144:ef7eb2e8f9f7 144 * @return An unsigned 16bit value representing the current input voltage
<> 144:ef7eb2e8f9f7 145 */
<> 144:ef7eb2e8f9f7 146 uint16_t analogin_read_u16(analogin_t *obj)
<> 144:ef7eb2e8f9f7 147 {
<> 144:ef7eb2e8f9f7 148 uint16_t adcData = 0;
<> 144:ef7eb2e8f9f7 149 uint8_t adc_pin = 0;
<> 144:ef7eb2e8f9f7 150
<> 144:ef7eb2e8f9f7 151 CLOCK_ENABLE(CLOCK_ADC);
<> 144:ef7eb2e8f9f7 152
<> 144:ef7eb2e8f9f7 153 if (obj->pinFlag) {
<> 144:ef7eb2e8f9f7 154 switch (obj->pin) {
<> 144:ef7eb2e8f9f7 155 case A0:
<> 144:ef7eb2e8f9f7 156 adc_pin=0;
<> 144:ef7eb2e8f9f7 157 break;
<> 144:ef7eb2e8f9f7 158 case A1:
<> 144:ef7eb2e8f9f7 159 adc_pin = 1;
<> 144:ef7eb2e8f9f7 160 break;
<> 144:ef7eb2e8f9f7 161 case A2:
<> 144:ef7eb2e8f9f7 162 adc_pin = 2;
<> 144:ef7eb2e8f9f7 163 break;
<> 144:ef7eb2e8f9f7 164 case A3:
<> 144:ef7eb2e8f9f7 165 adc_pin = 3;
<> 144:ef7eb2e8f9f7 166 break;
<> 144:ef7eb2e8f9f7 167 default:
<> 144:ef7eb2e8f9f7 168 break;
<> 144:ef7eb2e8f9f7 169 }
<> 144:ef7eb2e8f9f7 170
<> 144:ef7eb2e8f9f7 171 /* Re initialize the pin configured for ADC read */
<> 144:ef7eb2e8f9f7 172 obj->adcReg->CONTROL.BITS.CONV_CH = adc_pin;
<> 144:ef7eb2e8f9f7 173 }
<> 144:ef7eb2e8f9f7 174
<> 144:ef7eb2e8f9f7 175 obj->adcReg->CONTROL.BITS.START_CONV=1; /* Start The Conversion */
<> 144:ef7eb2e8f9f7 176
<> 144:ef7eb2e8f9f7 177 while((uint32_t)(obj->adcReg->STATUS)!=(uint32_t)1) {
<> 144:ef7eb2e8f9f7 178 }
<> 144:ef7eb2e8f9f7 179 adcData =(uint16_t)(obj->adcReg->DATA);
<> 144:ef7eb2e8f9f7 180 CLOCK_DISABLE(CLOCK_ADC);
<> 144:ef7eb2e8f9f7 181
<> 144:ef7eb2e8f9f7 182 return(adcData);
<> 144:ef7eb2e8f9f7 183 }
<> 144:ef7eb2e8f9f7 184
<> 144:ef7eb2e8f9f7 185 #endif // DEVICE_ANALOGIN
<> 144:ef7eb2e8f9f7 186