teralytic / mbed-dev

mbed library sources. Supersedes mbed-src.

Fork of mbed by teralytic

targets/hal/TARGET_STM/TARGET_STM32F0/analogin_api.c@5:ac9f6c2c45e8, 2015-10-06 (annotated)

Committer:
mbed_official
Date:
Tue Oct 06 13:30:11 2015 +0100
Revision:
5:ac9f6c2c45e8
Parent:
0:9b334a45a8ff
Child:
144:ef7eb2e8f9f7
Synchronized with git revision 3b75452bbd7b9aa90310014dbc8b6263ab4fd47d



Full URL: https://github.com/mbedmicro/mbed/commit/3b75452bbd7b9aa90310014dbc8b6263ab4fd47d/



Dev nucleo f042k6

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bogdanm 0:9b334a45a8ff 1 /* mbed Microcontroller Library
bogdanm 0:9b334a45a8ff 2 * Copyright (c) 2015, STMicroelectronics
bogdanm 0:9b334a45a8ff 3 * All rights reserved.
bogdanm 0:9b334a45a8ff 4 *
bogdanm 0:9b334a45a8ff 5 * Redistribution and use in source and binary forms, with or without
bogdanm 0:9b334a45a8ff 6 * modification, are permitted provided that the following conditions are met:
bogdanm 0:9b334a45a8ff 7 *
bogdanm 0:9b334a45a8ff 8 * 1. Redistributions of source code must retain the above copyright notice,
bogdanm 0:9b334a45a8ff 9 * this list of conditions and the following disclaimer.
bogdanm 0:9b334a45a8ff 10 * 2. Redistributions in binary form must reproduce the above copyright notice,
bogdanm 0:9b334a45a8ff 11 * this list of conditions and the following disclaimer in the documentation
bogdanm 0:9b334a45a8ff 12 * and/or other materials provided with the distribution.
bogdanm 0:9b334a45a8ff 13 * 3. Neither the name of STMicroelectronics nor the names of its contributors
bogdanm 0:9b334a45a8ff 14 * may be used to endorse or promote products derived from this software
bogdanm 0:9b334a45a8ff 15 * without specific prior written permission.
bogdanm 0:9b334a45a8ff 16 *
bogdanm 0:9b334a45a8ff 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
bogdanm 0:9b334a45a8ff 18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
bogdanm 0:9b334a45a8ff 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
bogdanm 0:9b334a45a8ff 20 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
bogdanm 0:9b334a45a8ff 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
bogdanm 0:9b334a45a8ff 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
bogdanm 0:9b334a45a8ff 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
bogdanm 0:9b334a45a8ff 24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
bogdanm 0:9b334a45a8ff 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
bogdanm 0:9b334a45a8ff 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
bogdanm 0:9b334a45a8ff 27 */
bogdanm 0:9b334a45a8ff 28 #include "mbed_assert.h"
bogdanm 0:9b334a45a8ff 29 #include "analogin_api.h"
bogdanm 0:9b334a45a8ff 30
bogdanm 0:9b334a45a8ff 31 #if DEVICE_ANALOGIN
bogdanm 0:9b334a45a8ff 32
bogdanm 0:9b334a45a8ff 33 #include "wait_api.h"
bogdanm 0:9b334a45a8ff 34 #include "cmsis.h"
bogdanm 0:9b334a45a8ff 35 #include "pinmap.h"
bogdanm 0:9b334a45a8ff 36 #include "PeripheralPins.h"
bogdanm 0:9b334a45a8ff 37 #include "mbed_error.h"
bogdanm 0:9b334a45a8ff 38
bogdanm 0:9b334a45a8ff 39 ADC_HandleTypeDef AdcHandle;
bogdanm 0:9b334a45a8ff 40
bogdanm 0:9b334a45a8ff 41 int adc_inited = 0;
bogdanm 0:9b334a45a8ff 42
bogdanm 0:9b334a45a8ff 43 void analogin_init(analogin_t *obj, PinName pin) {
bogdanm 0:9b334a45a8ff 44 // Get the peripheral name from the pin and assign it to the object
bogdanm 0:9b334a45a8ff 45 obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
bogdanm 0:9b334a45a8ff 46 MBED_ASSERT(obj->adc != (ADCName)NC);
bogdanm 0:9b334a45a8ff 47
bogdanm 0:9b334a45a8ff 48 // Configure GPIO
bogdanm 0:9b334a45a8ff 49 pinmap_pinout(pin, PinMap_ADC);
bogdanm 0:9b334a45a8ff 50
bogdanm 0:9b334a45a8ff 51 // Save pin number for the read function
bogdanm 0:9b334a45a8ff 52 obj->pin = pin;
bogdanm 0:9b334a45a8ff 53
bogdanm 0:9b334a45a8ff 54 // The ADC initialization is done once
bogdanm 0:9b334a45a8ff 55 if (adc_inited == 0) {
bogdanm 0:9b334a45a8ff 56 adc_inited = 1;
bogdanm 0:9b334a45a8ff 57
bogdanm 0:9b334a45a8ff 58 // Enable ADC clock
bogdanm 0:9b334a45a8ff 59 __ADC1_CLK_ENABLE();
bogdanm 0:9b334a45a8ff 60
bogdanm 0:9b334a45a8ff 61 // Configure ADC
bogdanm 0:9b334a45a8ff 62 AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
bogdanm 0:9b334a45a8ff 63 AdcHandle.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV4;
bogdanm 0:9b334a45a8ff 64 AdcHandle.Init.Resolution = ADC_RESOLUTION12b;
bogdanm 0:9b334a45a8ff 65 AdcHandle.Init.DataAlign = ADC_DATAALIGN_RIGHT;
bogdanm 0:9b334a45a8ff 66 AdcHandle.Init.ScanConvMode = DISABLE;
bogdanm 0:9b334a45a8ff 67 AdcHandle.Init.EOCSelection = EOC_SINGLE_CONV;
bogdanm 0:9b334a45a8ff 68 AdcHandle.Init.LowPowerAutoWait = DISABLE;
bogdanm 0:9b334a45a8ff 69 AdcHandle.Init.LowPowerAutoPowerOff = DISABLE;
bogdanm 0:9b334a45a8ff 70 AdcHandle.Init.ContinuousConvMode = DISABLE;
bogdanm 0:9b334a45a8ff 71 AdcHandle.Init.DiscontinuousConvMode = DISABLE;
bogdanm 0:9b334a45a8ff 72 AdcHandle.Init.ExternalTrigConv = ADC_SOFTWARE_START;
bogdanm 0:9b334a45a8ff 73 AdcHandle.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
bogdanm 0:9b334a45a8ff 74 AdcHandle.Init.DMAContinuousRequests = DISABLE;
bogdanm 0:9b334a45a8ff 75 AdcHandle.Init.Overrun = OVR_DATA_OVERWRITTEN;
bogdanm 0:9b334a45a8ff 76 if (HAL_ADC_Init(&AdcHandle) != HAL_OK) {
bogdanm 0:9b334a45a8ff 77 error("Cannot initialize ADC");
bogdanm 0:9b334a45a8ff 78 }
bogdanm 0:9b334a45a8ff 79 // Run the ADC calibration
bogdanm 0:9b334a45a8ff 80 if (HAL_ADCEx_Calibration_Start(&AdcHandle) != HAL_OK) {
bogdanm 0:9b334a45a8ff 81 error("Cannot Start ADC_Calibration");
bogdanm 0:9b334a45a8ff 82 }
bogdanm 0:9b334a45a8ff 83 }
bogdanm 0:9b334a45a8ff 84 }
bogdanm 0:9b334a45a8ff 85
bogdanm 0:9b334a45a8ff 86 static inline uint16_t adc_read(analogin_t *obj) {
bogdanm 0:9b334a45a8ff 87 ADC_ChannelConfTypeDef sConfig;
bogdanm 0:9b334a45a8ff 88
bogdanm 0:9b334a45a8ff 89 AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
bogdanm 0:9b334a45a8ff 90
bogdanm 0:9b334a45a8ff 91 // Configure ADC channel
bogdanm 0:9b334a45a8ff 92 sConfig.Rank = ADC_RANK_CHANNEL_NUMBER;
bogdanm 0:9b334a45a8ff 93 #if defined (TARGET_STM32F091RC)
bogdanm 0:9b334a45a8ff 94 sConfig.SamplingTime = ADC_SAMPLETIME_13CYCLES_5;
bogdanm 0:9b334a45a8ff 95 #else
bogdanm 0:9b334a45a8ff 96 sConfig.SamplingTime = ADC_SAMPLETIME_7CYCLES_5;
bogdanm 0:9b334a45a8ff 97 #endif
bogdanm 0:9b334a45a8ff 98
bogdanm 0:9b334a45a8ff 99 switch (obj->pin) {
bogdanm 0:9b334a45a8ff 100 case PA_0:
bogdanm 0:9b334a45a8ff 101 sConfig.Channel = ADC_CHANNEL_0;
bogdanm 0:9b334a45a8ff 102 break;
bogdanm 0:9b334a45a8ff 103 case PA_1:
bogdanm 0:9b334a45a8ff 104 sConfig.Channel = ADC_CHANNEL_1;
bogdanm 0:9b334a45a8ff 105 break;
bogdanm 0:9b334a45a8ff 106 case PA_2:
bogdanm 0:9b334a45a8ff 107 sConfig.Channel = ADC_CHANNEL_2;
bogdanm 0:9b334a45a8ff 108 break;
bogdanm 0:9b334a45a8ff 109 case PA_3:
bogdanm 0:9b334a45a8ff 110 sConfig.Channel = ADC_CHANNEL_3;
bogdanm 0:9b334a45a8ff 111 break;
bogdanm 0:9b334a45a8ff 112 case PA_4:
bogdanm 0:9b334a45a8ff 113 sConfig.Channel = ADC_CHANNEL_4;
bogdanm 0:9b334a45a8ff 114 break;
bogdanm 0:9b334a45a8ff 115 case PA_5:
bogdanm 0:9b334a45a8ff 116 sConfig.Channel = ADC_CHANNEL_5;
bogdanm 0:9b334a45a8ff 117 break;
bogdanm 0:9b334a45a8ff 118 case PA_6:
bogdanm 0:9b334a45a8ff 119 sConfig.Channel = ADC_CHANNEL_6;
bogdanm 0:9b334a45a8ff 120 break;
bogdanm 0:9b334a45a8ff 121 case PA_7:
bogdanm 0:9b334a45a8ff 122 sConfig.Channel = ADC_CHANNEL_7;
bogdanm 0:9b334a45a8ff 123 break;
bogdanm 0:9b334a45a8ff 124 case PB_0:
bogdanm 0:9b334a45a8ff 125 sConfig.Channel = ADC_CHANNEL_8;
bogdanm 0:9b334a45a8ff 126 break;
bogdanm 0:9b334a45a8ff 127 case PB_1:
bogdanm 0:9b334a45a8ff 128 sConfig.Channel = ADC_CHANNEL_9;
bogdanm 0:9b334a45a8ff 129 break;
mbed_official 5:ac9f6c2c45e8 130 #if !defined (TARGET_STM32F031K6) && !defined (TARGET_STM32F042K6)
bogdanm 0:9b334a45a8ff 131 case PC_0:
bogdanm 0:9b334a45a8ff 132 sConfig.Channel = ADC_CHANNEL_10;
bogdanm 0:9b334a45a8ff 133 break;
bogdanm 0:9b334a45a8ff 134 case PC_1:
bogdanm 0:9b334a45a8ff 135 sConfig.Channel = ADC_CHANNEL_11;
bogdanm 0:9b334a45a8ff 136 break;
bogdanm 0:9b334a45a8ff 137 case PC_2:
bogdanm 0:9b334a45a8ff 138 sConfig.Channel = ADC_CHANNEL_12;
bogdanm 0:9b334a45a8ff 139 break;
bogdanm 0:9b334a45a8ff 140 case PC_3:
bogdanm 0:9b334a45a8ff 141 sConfig.Channel = ADC_CHANNEL_13;
bogdanm 0:9b334a45a8ff 142 break;
bogdanm 0:9b334a45a8ff 143 case PC_4:
bogdanm 0:9b334a45a8ff 144 sConfig.Channel = ADC_CHANNEL_14;
bogdanm 0:9b334a45a8ff 145 break;
bogdanm 0:9b334a45a8ff 146 case PC_5:
bogdanm 0:9b334a45a8ff 147 sConfig.Channel = ADC_CHANNEL_15;
bogdanm 0:9b334a45a8ff 148 break;
bogdanm 0:9b334a45a8ff 149 #endif
bogdanm 0:9b334a45a8ff 150 default:
bogdanm 0:9b334a45a8ff 151 return 0;
bogdanm 0:9b334a45a8ff 152 }
bogdanm 0:9b334a45a8ff 153
bogdanm 0:9b334a45a8ff 154 // Clear all channels as it is not done in HAL_ADC_ConfigChannel()
bogdanm 0:9b334a45a8ff 155 AdcHandle.Instance->CHSELR = 0;
bogdanm 0:9b334a45a8ff 156
bogdanm 0:9b334a45a8ff 157 HAL_ADC_ConfigChannel(&AdcHandle, &sConfig);
bogdanm 0:9b334a45a8ff 158
bogdanm 0:9b334a45a8ff 159 HAL_ADC_Start(&AdcHandle); // Start conversion
bogdanm 0:9b334a45a8ff 160
bogdanm 0:9b334a45a8ff 161 // Wait end of conversion and get value
bogdanm 0:9b334a45a8ff 162 if (HAL_ADC_PollForConversion(&AdcHandle, 10) == HAL_OK) {
bogdanm 0:9b334a45a8ff 163 return (HAL_ADC_GetValue(&AdcHandle));
bogdanm 0:9b334a45a8ff 164 } else {
bogdanm 0:9b334a45a8ff 165 return 0;
bogdanm 0:9b334a45a8ff 166 }
bogdanm 0:9b334a45a8ff 167 }
bogdanm 0:9b334a45a8ff 168
bogdanm 0:9b334a45a8ff 169 uint16_t analogin_read_u16(analogin_t *obj) {
bogdanm 0:9b334a45a8ff 170 uint16_t value = adc_read(obj);
bogdanm 0:9b334a45a8ff 171 // 12-bit to 16-bit conversion
bogdanm 0:9b334a45a8ff 172 value = ((value << 4) & (uint16_t)0xFFF0) | ((value >> 8) & (uint16_t)0x000F);
bogdanm 0:9b334a45a8ff 173 return value;
bogdanm 0:9b334a45a8ff 174 }
bogdanm 0:9b334a45a8ff 175
bogdanm 0:9b334a45a8ff 176 float analogin_read(analogin_t *obj) {
bogdanm 0:9b334a45a8ff 177 uint16_t value = adc_read(obj);
bogdanm 0:9b334a45a8ff 178 return (float)value * (1.0f / (float)0xFFF); // 12 bits range
bogdanm 0:9b334a45a8ff 179 }
bogdanm 0:9b334a45a8ff 180
bogdanm 0:9b334a45a8ff 181 #endif