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mbed library sources. Supersedes mbed-src.

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targets/TARGET_STM/TARGET_STM32L0/analogin_api.c@180:d79f997829d6, 2017-12-18 (annotated)

Committer:
Anythingconnected
Date:
Mon Dec 18 10:14:27 2017 +0000
Revision:
180:d79f997829d6
Parent:
172:7d866c31b3c5 
Getting byte by byte read to work

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 149:156823d33999 1 /* mbed Microcontroller Library
<> 149:156823d33999 2 * Copyright (c) 2015, STMicroelectronics
<> 149:156823d33999 3 * All rights reserved.
<> 149:156823d33999 4 *
<> 149:156823d33999 5 * Redistribution and use in source and binary forms, with or without
<> 149:156823d33999 6 * modification, are permitted provided that the following conditions are met:
<> 149:156823d33999 7 *
<> 149:156823d33999 8 * 1. Redistributions of source code must retain the above copyright notice,
<> 149:156823d33999 9 * this list of conditions and the following disclaimer.
<> 149:156823d33999 10 * 2. Redistributions in binary form must reproduce the above copyright notice,
<> 149:156823d33999 11 * this list of conditions and the following disclaimer in the documentation
<> 149:156823d33999 12 * and/or other materials provided with the distribution.
<> 149:156823d33999 13 * 3. Neither the name of STMicroelectronics nor the names of its contributors
<> 149:156823d33999 14 * may be used to endorse or promote products derived from this software
<> 149:156823d33999 15 * without specific prior written permission.
<> 149:156823d33999 16 *
<> 149:156823d33999 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
<> 149:156823d33999 18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
<> 149:156823d33999 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
<> 149:156823d33999 20 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
<> 149:156823d33999 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
<> 149:156823d33999 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
<> 149:156823d33999 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
<> 149:156823d33999 24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
<> 149:156823d33999 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
<> 149:156823d33999 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
<> 149:156823d33999 27 */
<> 149:156823d33999 28 #include "mbed_assert.h"
<> 149:156823d33999 29 #include "analogin_api.h"
<> 149:156823d33999 30
<> 149:156823d33999 31 #if DEVICE_ANALOGIN
<> 149:156823d33999 32
<> 160:d5399cc887bb 33 #include "mbed_wait_api.h"
<> 149:156823d33999 34 #include "cmsis.h"
<> 149:156823d33999 35 #include "pinmap.h"
<> 149:156823d33999 36 #include "mbed_error.h"
<> 149:156823d33999 37 #include "PeripheralPins.h"
<> 149:156823d33999 38
<> 149:156823d33999 39 int adc_inited = 0;
<> 149:156823d33999 40
<> 149:156823d33999 41 void analogin_init(analogin_t *obj, PinName pin)
<> 149:156823d33999 42 {
Kojto 169:e3b6fe271b81 43 uint32_t function = (uint32_t)NC;
AnnaBridge 171:89b338f31ef1 44 obj->handle.Instance = (ADC_TypeDef *)NC;
Kojto 169:e3b6fe271b81 45
Kojto 169:e3b6fe271b81 46 // ADC Internal Channels "pins" (Temperature, Vref, Vbat, ...)
Kojto 169:e3b6fe271b81 47 // are described in PinNames.h and PeripheralPins.c
AnnaBridge 172:7d866c31b3c5 48 // Pin value must be between 0xF0 and 0xFF
AnnaBridge 172:7d866c31b3c5 49 if ((pin < 0xF0) || (pin >= 0x100)) {
Kojto 169:e3b6fe271b81 50 // Normal channels
Kojto 169:e3b6fe271b81 51 // Get the peripheral name from the pin and assign it to the object
AnnaBridge 171:89b338f31ef1 52 obj->handle.Instance = (ADC_TypeDef *)pinmap_peripheral(pin, PinMap_ADC);
Kojto 169:e3b6fe271b81 53 // Get the functions (adc channel) from the pin and assign it to the object
Kojto 169:e3b6fe271b81 54 function = pinmap_function(pin, PinMap_ADC);
Kojto 169:e3b6fe271b81 55 // Configure GPIO
Kojto 169:e3b6fe271b81 56 pinmap_pinout(pin, PinMap_ADC);
Kojto 169:e3b6fe271b81 57 } else {
Kojto 169:e3b6fe271b81 58 // Internal channels
AnnaBridge 171:89b338f31ef1 59 obj->handle.Instance = (ADC_TypeDef *)pinmap_peripheral(pin, PinMap_ADC_Internal);
Kojto 169:e3b6fe271b81 60 function = pinmap_function(pin, PinMap_ADC_Internal);
Kojto 169:e3b6fe271b81 61 // No GPIO configuration for internal channels
Kojto 169:e3b6fe271b81 62 }
AnnaBridge 171:89b338f31ef1 63 MBED_ASSERT(obj->handle.Instance != (ADC_TypeDef *)NC);
<> 149:156823d33999 64 MBED_ASSERT(function != (uint32_t)NC);
Kojto 169:e3b6fe271b81 65
<> 149:156823d33999 66 obj->channel = STM_PIN_CHANNEL(function);
<> 149:156823d33999 67
<> 149:156823d33999 68 // Save pin number for the read function
<> 149:156823d33999 69 obj->pin = pin;
<> 149:156823d33999 70
<> 149:156823d33999 71 // The ADC initialization is done once
<> 149:156823d33999 72 if (adc_inited == 0) {
<> 149:156823d33999 73 adc_inited = 1;
<> 149:156823d33999 74
AnnaBridge 171:89b338f31ef1 75 obj->handle.State = HAL_ADC_STATE_RESET;
<> 149:156823d33999 76 // Enable ADC clock
<> 149:156823d33999 77 __ADC1_CLK_ENABLE();
<> 149:156823d33999 78
<> 149:156823d33999 79 // Configure ADC
AnnaBridge 171:89b338f31ef1 80 obj->handle.Init.OversamplingMode = DISABLE;
AnnaBridge 171:89b338f31ef1 81 obj->handle.Init.ClockPrescaler = ADC_CLOCKPRESCALER_PCLK_DIV1;
AnnaBridge 171:89b338f31ef1 82 obj->handle.Init.Resolution = ADC_RESOLUTION12b;
AnnaBridge 171:89b338f31ef1 83 obj->handle.Init.SamplingTime = ADC_SAMPLETIME_239CYCLES_5;
AnnaBridge 171:89b338f31ef1 84 obj->handle.Init.ScanConvMode = ADC_SCAN_DIRECTION_FORWARD;
AnnaBridge 171:89b338f31ef1 85 obj->handle.Init.DataAlign = ADC_DATAALIGN_RIGHT;
AnnaBridge 171:89b338f31ef1 86 obj->handle.Init.ContinuousConvMode = DISABLE;
AnnaBridge 171:89b338f31ef1 87 obj->handle.Init.DiscontinuousConvMode = DISABLE;
AnnaBridge 171:89b338f31ef1 88 obj->handle.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIG_EDGE_NONE;
AnnaBridge 171:89b338f31ef1 89 obj->handle.Init.ExternalTrigConv = ADC_EXTERNALTRIG0_T6_TRGO; // Not used here
AnnaBridge 171:89b338f31ef1 90 obj->handle.Init.DMAContinuousRequests = DISABLE;
AnnaBridge 171:89b338f31ef1 91 obj->handle.Init.EOCSelection = EOC_SINGLE_CONV;
AnnaBridge 171:89b338f31ef1 92 obj->handle.Init.Overrun = OVR_DATA_OVERWRITTEN;
AnnaBridge 171:89b338f31ef1 93 obj->handle.Init.LowPowerAutoWait = ENABLE;
AnnaBridge 171:89b338f31ef1 94 obj->handle.Init.LowPowerFrequencyMode = DISABLE; // To be enabled only if ADC clock < 2.8 MHz
AnnaBridge 171:89b338f31ef1 95 obj->handle.Init.LowPowerAutoPowerOff = DISABLE;
<> 149:156823d33999 96
AnnaBridge 171:89b338f31ef1 97 if (HAL_ADC_Init(&obj->handle) != HAL_OK) {
<> 149:156823d33999 98 error("Cannot initialize ADC");
<> 149:156823d33999 99 }
<> 149:156823d33999 100
<> 149:156823d33999 101 // Calibration
AnnaBridge 171:89b338f31ef1 102 HAL_ADCEx_Calibration_Start(&obj->handle, ADC_SINGLE_ENDED);
<> 149:156823d33999 103
AnnaBridge 171:89b338f31ef1 104 __HAL_ADC_ENABLE(&obj->handle);
<> 149:156823d33999 105 }
<> 149:156823d33999 106 }
<> 149:156823d33999 107
<> 149:156823d33999 108 static inline uint16_t adc_read(analogin_t *obj)
<> 149:156823d33999 109 {
<> 149:156823d33999 110 ADC_ChannelConfTypeDef sConfig = {0};
<> 149:156823d33999 111
<> 149:156823d33999 112 // Configure ADC channel
<> 153:fa9ff456f731 113 sConfig.Rank = ADC_RANK_CHANNEL_NUMBER;
<> 149:156823d33999 114 switch (obj->channel) {
<> 149:156823d33999 115 case 0:
<> 149:156823d33999 116 sConfig.Channel = ADC_CHANNEL_0;
<> 149:156823d33999 117 break;
<> 149:156823d33999 118 case 1:
<> 149:156823d33999 119 sConfig.Channel = ADC_CHANNEL_1;
<> 149:156823d33999 120 break;
<> 149:156823d33999 121 case 2:
<> 149:156823d33999 122 sConfig.Channel = ADC_CHANNEL_2;
<> 149:156823d33999 123 break;
<> 149:156823d33999 124 case 3:
<> 149:156823d33999 125 sConfig.Channel = ADC_CHANNEL_3;
<> 149:156823d33999 126 break;
<> 149:156823d33999 127 case 4:
<> 149:156823d33999 128 sConfig.Channel = ADC_CHANNEL_4;
<> 149:156823d33999 129 break;
<> 149:156823d33999 130 case 5:
<> 149:156823d33999 131 sConfig.Channel = ADC_CHANNEL_5;
<> 149:156823d33999 132 break;
<> 149:156823d33999 133 case 6:
<> 149:156823d33999 134 sConfig.Channel = ADC_CHANNEL_6;
<> 149:156823d33999 135 break;
<> 149:156823d33999 136 case 7:
<> 149:156823d33999 137 sConfig.Channel = ADC_CHANNEL_7;
<> 149:156823d33999 138 break;
<> 149:156823d33999 139 case 8:
<> 149:156823d33999 140 sConfig.Channel = ADC_CHANNEL_8;
<> 149:156823d33999 141 break;
<> 149:156823d33999 142 case 9:
<> 149:156823d33999 143 sConfig.Channel = ADC_CHANNEL_9;
<> 149:156823d33999 144 break;
<> 149:156823d33999 145 case 10:
<> 149:156823d33999 146 sConfig.Channel = ADC_CHANNEL_10;
<> 149:156823d33999 147 break;
<> 149:156823d33999 148 case 11:
<> 149:156823d33999 149 sConfig.Channel = ADC_CHANNEL_11;
<> 149:156823d33999 150 break;
<> 149:156823d33999 151 case 12:
<> 149:156823d33999 152 sConfig.Channel = ADC_CHANNEL_12;
<> 149:156823d33999 153 break;
<> 149:156823d33999 154 case 13:
<> 149:156823d33999 155 sConfig.Channel = ADC_CHANNEL_13;
<> 149:156823d33999 156 break;
<> 149:156823d33999 157 case 14:
<> 149:156823d33999 158 sConfig.Channel = ADC_CHANNEL_14;
<> 149:156823d33999 159 break;
<> 149:156823d33999 160 case 15:
<> 149:156823d33999 161 sConfig.Channel = ADC_CHANNEL_15;
<> 149:156823d33999 162 break;
<> 149:156823d33999 163 #ifdef ADC_CHANNEL_VLCD
<> 149:156823d33999 164 case 16:
<> 149:156823d33999 165 sConfig.Channel = ADC_CHANNEL_VLCD;
<> 149:156823d33999 166 break;
<> 149:156823d33999 167 #endif
<> 149:156823d33999 168 case 17:
<> 149:156823d33999 169 sConfig.Channel = ADC_CHANNEL_VREFINT;
<> 149:156823d33999 170 break;
<> 149:156823d33999 171 case 18:
<> 149:156823d33999 172 sConfig.Channel = ADC_CHANNEL_TEMPSENSOR;
<> 149:156823d33999 173 break;
<> 149:156823d33999 174 default:
<> 149:156823d33999 175 return 0;
<> 149:156823d33999 176 }
<> 149:156823d33999 177
<> 149:156823d33999 178 ADC1->CHSELR = 0; // [TODO] Workaround. To be removed after Cube driver is corrected.
AnnaBridge 171:89b338f31ef1 179 HAL_ADC_ConfigChannel(&obj->handle, &sConfig);
<> 149:156823d33999 180
AnnaBridge 171:89b338f31ef1 181 HAL_ADC_Start(&obj->handle); // Start conversion
<> 149:156823d33999 182
<> 149:156823d33999 183 // Wait end of conversion and get value
AnnaBridge 171:89b338f31ef1 184 if (HAL_ADC_PollForConversion(&obj->handle, 10) == HAL_OK) {
AnnaBridge 171:89b338f31ef1 185 return (HAL_ADC_GetValue(&obj->handle));
<> 149:156823d33999 186 } else {
<> 149:156823d33999 187 return 0;
<> 149:156823d33999 188 }
<> 149:156823d33999 189 }
<> 149:156823d33999 190
<> 149:156823d33999 191 uint16_t analogin_read_u16(analogin_t *obj)
<> 149:156823d33999 192 {
<> 149:156823d33999 193 uint16_t value = adc_read(obj);
<> 149:156823d33999 194 // 12-bit to 16-bit conversion
<> 149:156823d33999 195 value = ((value << 4) & (uint16_t)0xFFF0) | ((value >> 8) & (uint16_t)0x000F);
<> 149:156823d33999 196 return value;
<> 149:156823d33999 197 }
<> 149:156823d33999 198
<> 149:156823d33999 199 float analogin_read(analogin_t *obj)
<> 149:156823d33999 200 {
<> 149:156823d33999 201 uint16_t value = adc_read(obj);
<> 149:156823d33999 202 return (float)value * (1.0f / (float)0xFFF); // 12 bits range
<> 149:156823d33999 203 }
<> 149:156823d33999 204
<> 149:156823d33999 205 #endif