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Fork of mbed-stm32l0l1-src-1 by lzbp li

api_source/analogin_api.c@639:b32fded6b0ae, 2016-09-27 (annotated)

Committer:
floatlei
Date:
Tue Sep 27 09:40:53 2016 +0000
Revision:
639:b32fded6b0ae
Parent:
targets/hal/TARGET_STM/TARGET_STM32L0/analogin_api.c@531:47d2b67c511f 
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Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 181:a4cbdfbbd2f4 1 /* mbed Microcontroller Library
mbed_official 531:47d2b67c511f 2 * Copyright (c) 2015, STMicroelectronics
mbed_official 181:a4cbdfbbd2f4 3 * All rights reserved.
mbed_official 181:a4cbdfbbd2f4 4 *
mbed_official 181:a4cbdfbbd2f4 5 * Redistribution and use in source and binary forms, with or without
mbed_official 181:a4cbdfbbd2f4 6 * modification, are permitted provided that the following conditions are met:
mbed_official 181:a4cbdfbbd2f4 7 *
mbed_official 181:a4cbdfbbd2f4 8 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 181:a4cbdfbbd2f4 9 * this list of conditions and the following disclaimer.
mbed_official 181:a4cbdfbbd2f4 10 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 181:a4cbdfbbd2f4 11 * this list of conditions and the following disclaimer in the documentation
mbed_official 181:a4cbdfbbd2f4 12 * and/or other materials provided with the distribution.
mbed_official 181:a4cbdfbbd2f4 13 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 181:a4cbdfbbd2f4 14 * may be used to endorse or promote products derived from this software
mbed_official 181:a4cbdfbbd2f4 15 * without specific prior written permission.
mbed_official 181:a4cbdfbbd2f4 16 *
mbed_official 181:a4cbdfbbd2f4 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 181:a4cbdfbbd2f4 18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 181:a4cbdfbbd2f4 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 181:a4cbdfbbd2f4 20 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 181:a4cbdfbbd2f4 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 181:a4cbdfbbd2f4 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 181:a4cbdfbbd2f4 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 181:a4cbdfbbd2f4 24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 181:a4cbdfbbd2f4 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 181:a4cbdfbbd2f4 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 181:a4cbdfbbd2f4 27 */
mbed_official 227:7bd0639b8911 28 #include "mbed_assert.h"
mbed_official 181:a4cbdfbbd2f4 29 #include "analogin_api.h"
mbed_official 181:a4cbdfbbd2f4 30
mbed_official 181:a4cbdfbbd2f4 31 #if DEVICE_ANALOGIN
mbed_official 181:a4cbdfbbd2f4 32
mbed_official 181:a4cbdfbbd2f4 33 #include "wait_api.h"
mbed_official 181:a4cbdfbbd2f4 34 #include "cmsis.h"
mbed_official 181:a4cbdfbbd2f4 35 #include "pinmap.h"
mbed_official 531:47d2b67c511f 36 #include "mbed_error.h"
mbed_official 414:4ec4c5b614b0 37 #include "PeripheralPins.h"
mbed_official 181:a4cbdfbbd2f4 38
mbed_official 181:a4cbdfbbd2f4 39 ADC_HandleTypeDef AdcHandle;
mbed_official 181:a4cbdfbbd2f4 40
mbed_official 181:a4cbdfbbd2f4 41 int adc_inited = 0;
mbed_official 181:a4cbdfbbd2f4 42
mbed_official 402:09075a3b15e3 43 void analogin_init(analogin_t *obj, PinName pin)
mbed_official 402:09075a3b15e3 44 {
mbed_official 181:a4cbdfbbd2f4 45 // Get the peripheral name from the pin and assign it to the object
mbed_official 181:a4cbdfbbd2f4 46 obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
mbed_official 227:7bd0639b8911 47 MBED_ASSERT(obj->adc != (ADCName)NC);
mbed_official 181:a4cbdfbbd2f4 48
mbed_official 531:47d2b67c511f 49 // Get the pin function and assign the used channel to the object
mbed_official 531:47d2b67c511f 50 uint32_t function = pinmap_function(pin, PinMap_ADC);
mbed_official 531:47d2b67c511f 51 MBED_ASSERT(function != (uint32_t)NC);
mbed_official 531:47d2b67c511f 52 obj->channel = STM_PIN_CHANNEL(function);
mbed_official 531:47d2b67c511f 53
mbed_official 181:a4cbdfbbd2f4 54 // Configure GPIO
mbed_official 181:a4cbdfbbd2f4 55 pinmap_pinout(pin, PinMap_ADC);
mbed_official 181:a4cbdfbbd2f4 56
mbed_official 181:a4cbdfbbd2f4 57 // Save pin number for the read function
mbed_official 181:a4cbdfbbd2f4 58 obj->pin = pin;
mbed_official 181:a4cbdfbbd2f4 59
mbed_official 181:a4cbdfbbd2f4 60 // The ADC initialization is done once
mbed_official 181:a4cbdfbbd2f4 61 if (adc_inited == 0) {
mbed_official 181:a4cbdfbbd2f4 62 adc_inited = 1;
mbed_official 181:a4cbdfbbd2f4 63
mbed_official 291:bdc8a81aee9a 64 AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
mbed_official 291:bdc8a81aee9a 65
mbed_official 181:a4cbdfbbd2f4 66 // Enable ADC clock
mbed_official 181:a4cbdfbbd2f4 67 __ADC1_CLK_ENABLE();
mbed_official 181:a4cbdfbbd2f4 68
mbed_official 181:a4cbdfbbd2f4 69 // Configure ADC
mbed_official 181:a4cbdfbbd2f4 70 AdcHandle.Init.OversamplingMode = DISABLE;
mbed_official 334:c5736b48acaf 71 AdcHandle.Init.ClockPrescaler = ADC_CLOCKPRESCALER_PCLK_DIV1;
mbed_official 181:a4cbdfbbd2f4 72 AdcHandle.Init.Resolution = ADC_RESOLUTION12b;
mbed_official 334:c5736b48acaf 73 AdcHandle.Init.SamplingTime = ADC_SAMPLETIME_41CYCLES_5;
mbed_official 489:119543c9f674 74 AdcHandle.Init.ScanConvMode = ADC_SCAN_DIRECTION_FORWARD;
mbed_official 181:a4cbdfbbd2f4 75 AdcHandle.Init.DataAlign = ADC_DATAALIGN_RIGHT;
mbed_official 181:a4cbdfbbd2f4 76 AdcHandle.Init.ContinuousConvMode = DISABLE;
mbed_official 181:a4cbdfbbd2f4 77 AdcHandle.Init.DiscontinuousConvMode = DISABLE;
mbed_official 181:a4cbdfbbd2f4 78 AdcHandle.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIG_EDGE_NONE;
mbed_official 181:a4cbdfbbd2f4 79 AdcHandle.Init.ExternalTrigConv = ADC_EXTERNALTRIG0_T6_TRGO; // Not used here
mbed_official 181:a4cbdfbbd2f4 80 AdcHandle.Init.DMAContinuousRequests = DISABLE;
mbed_official 181:a4cbdfbbd2f4 81 AdcHandle.Init.EOCSelection = EOC_SINGLE_CONV;
mbed_official 334:c5736b48acaf 82 AdcHandle.Init.Overrun = OVR_DATA_OVERWRITTEN;
mbed_official 181:a4cbdfbbd2f4 83 AdcHandle.Init.LowPowerAutoWait = ENABLE;
mbed_official 181:a4cbdfbbd2f4 84 AdcHandle.Init.LowPowerFrequencyMode = DISABLE; // To be enabled only if ADC clock < 2.8 MHz
mbed_official 489:119543c9f674 85 AdcHandle.Init.LowPowerAutoPowerOff = DISABLE;
mbed_official 531:47d2b67c511f 86
mbed_official 531:47d2b67c511f 87 if (HAL_ADC_Init(&AdcHandle) != HAL_OK) {
mbed_official 531:47d2b67c511f 88 error("Cannot initialize ADC");
mbed_official 531:47d2b67c511f 89 }
mbed_official 402:09075a3b15e3 90
mbed_official 291:bdc8a81aee9a 91 // Calibration
mbed_official 291:bdc8a81aee9a 92 HAL_ADCEx_Calibration_Start(&AdcHandle, ADC_SINGLE_ENDED);
mbed_official 402:09075a3b15e3 93
mbed_official 291:bdc8a81aee9a 94 __HAL_ADC_ENABLE(&AdcHandle);
mbed_official 181:a4cbdfbbd2f4 95 }
mbed_official 181:a4cbdfbbd2f4 96 }
mbed_official 181:a4cbdfbbd2f4 97
mbed_official 402:09075a3b15e3 98 static inline uint16_t adc_read(analogin_t *obj)
mbed_official 402:09075a3b15e3 99 {
mbed_official 531:47d2b67c511f 100 ADC_ChannelConfTypeDef sConfig = {0};
mbed_official 181:a4cbdfbbd2f4 101
mbed_official 181:a4cbdfbbd2f4 102 AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
mbed_official 181:a4cbdfbbd2f4 103
mbed_official 181:a4cbdfbbd2f4 104 // Configure ADC channel
mbed_official 531:47d2b67c511f 105 switch (obj->channel) {
mbed_official 531:47d2b67c511f 106 case 0:
mbed_official 181:a4cbdfbbd2f4 107 sConfig.Channel = ADC_CHANNEL_0;
mbed_official 181:a4cbdfbbd2f4 108 break;
mbed_official 531:47d2b67c511f 109 case 1:
mbed_official 181:a4cbdfbbd2f4 110 sConfig.Channel = ADC_CHANNEL_1;
mbed_official 181:a4cbdfbbd2f4 111 break;
mbed_official 531:47d2b67c511f 112 case 2:
mbed_official 181:a4cbdfbbd2f4 113 sConfig.Channel = ADC_CHANNEL_2;
mbed_official 181:a4cbdfbbd2f4 114 break;
mbed_official 531:47d2b67c511f 115 case 3:
mbed_official 181:a4cbdfbbd2f4 116 sConfig.Channel = ADC_CHANNEL_3;
mbed_official 181:a4cbdfbbd2f4 117 break;
mbed_official 531:47d2b67c511f 118 case 4:
mbed_official 181:a4cbdfbbd2f4 119 sConfig.Channel = ADC_CHANNEL_4;
mbed_official 181:a4cbdfbbd2f4 120 break;
mbed_official 531:47d2b67c511f 121 case 5:
mbed_official 181:a4cbdfbbd2f4 122 sConfig.Channel = ADC_CHANNEL_5;
mbed_official 181:a4cbdfbbd2f4 123 break;
mbed_official 531:47d2b67c511f 124 case 6:
mbed_official 181:a4cbdfbbd2f4 125 sConfig.Channel = ADC_CHANNEL_6;
mbed_official 181:a4cbdfbbd2f4 126 break;
mbed_official 531:47d2b67c511f 127 case 7:
mbed_official 181:a4cbdfbbd2f4 128 sConfig.Channel = ADC_CHANNEL_7;
mbed_official 181:a4cbdfbbd2f4 129 break;
mbed_official 531:47d2b67c511f 130 case 8:
mbed_official 181:a4cbdfbbd2f4 131 sConfig.Channel = ADC_CHANNEL_8;
mbed_official 181:a4cbdfbbd2f4 132 break;
mbed_official 531:47d2b67c511f 133 case 9:
mbed_official 181:a4cbdfbbd2f4 134 sConfig.Channel = ADC_CHANNEL_9;
mbed_official 181:a4cbdfbbd2f4 135 break;
mbed_official 531:47d2b67c511f 136 case 10:
mbed_official 181:a4cbdfbbd2f4 137 sConfig.Channel = ADC_CHANNEL_10;
mbed_official 181:a4cbdfbbd2f4 138 break;
mbed_official 531:47d2b67c511f 139 case 11:
mbed_official 181:a4cbdfbbd2f4 140 sConfig.Channel = ADC_CHANNEL_11;
mbed_official 181:a4cbdfbbd2f4 141 break;
mbed_official 531:47d2b67c511f 142 case 12:
mbed_official 181:a4cbdfbbd2f4 143 sConfig.Channel = ADC_CHANNEL_12;
mbed_official 181:a4cbdfbbd2f4 144 break;
mbed_official 531:47d2b67c511f 145 case 13:
mbed_official 181:a4cbdfbbd2f4 146 sConfig.Channel = ADC_CHANNEL_13;
mbed_official 181:a4cbdfbbd2f4 147 break;
mbed_official 531:47d2b67c511f 148 case 14:
mbed_official 181:a4cbdfbbd2f4 149 sConfig.Channel = ADC_CHANNEL_14;
mbed_official 181:a4cbdfbbd2f4 150 break;
mbed_official 531:47d2b67c511f 151 case 15:
mbed_official 181:a4cbdfbbd2f4 152 sConfig.Channel = ADC_CHANNEL_15;
mbed_official 181:a4cbdfbbd2f4 153 break;
mbed_official 181:a4cbdfbbd2f4 154 default:
mbed_official 181:a4cbdfbbd2f4 155 return 0;
mbed_official 181:a4cbdfbbd2f4 156 }
mbed_official 181:a4cbdfbbd2f4 157
mbed_official 181:a4cbdfbbd2f4 158 ADC1->CHSELR = 0; // [TODO] Workaround. To be removed after Cube driver is corrected.
mbed_official 181:a4cbdfbbd2f4 159 HAL_ADC_ConfigChannel(&AdcHandle, &sConfig);
mbed_official 181:a4cbdfbbd2f4 160
mbed_official 181:a4cbdfbbd2f4 161 HAL_ADC_Start(&AdcHandle); // Start conversion
mbed_official 181:a4cbdfbbd2f4 162
mbed_official 181:a4cbdfbbd2f4 163 // Wait end of conversion and get value
mbed_official 181:a4cbdfbbd2f4 164 if (HAL_ADC_PollForConversion(&AdcHandle, 10) == HAL_OK) {
mbed_official 181:a4cbdfbbd2f4 165 return (HAL_ADC_GetValue(&AdcHandle));
mbed_official 181:a4cbdfbbd2f4 166 } else {
mbed_official 181:a4cbdfbbd2f4 167 return 0;
mbed_official 181:a4cbdfbbd2f4 168 }
mbed_official 181:a4cbdfbbd2f4 169 }
mbed_official 181:a4cbdfbbd2f4 170
mbed_official 402:09075a3b15e3 171 uint16_t analogin_read_u16(analogin_t *obj)
mbed_official 402:09075a3b15e3 172 {
mbed_official 298:7557d401dbc3 173 uint16_t value = adc_read(obj);
mbed_official 298:7557d401dbc3 174 // 12-bit to 16-bit conversion
mbed_official 298:7557d401dbc3 175 value = ((value << 4) & (uint16_t)0xFFF0) | ((value >> 8) & (uint16_t)0x000F);
mbed_official 298:7557d401dbc3 176 return value;
mbed_official 181:a4cbdfbbd2f4 177 }
mbed_official 181:a4cbdfbbd2f4 178
mbed_official 402:09075a3b15e3 179 float analogin_read(analogin_t *obj)
mbed_official 402:09075a3b15e3 180 {
mbed_official 181:a4cbdfbbd2f4 181 uint16_t value = adc_read(obj);
mbed_official 181:a4cbdfbbd2f4 182 return (float)value * (1.0f / (float)0xFFF); // 12 bits range
mbed_official 181:a4cbdfbbd2f4 183 }
mbed_official 181:a4cbdfbbd2f4 184
mbed_official 181:a4cbdfbbd2f4 185 #endif