Ermanno Brusadin / mbed

mbed library sources

Dependents:   FRDM-KL46Z_LCD_Test FRDM-KL46Z_LCD_Test FRDM-KL46Z_Plantilla FRDM-KL46Z_Plantilla ... more

targets/hal/TARGET_STM/TARGET_NUCLEO_L053R8/analogin_api.c@0:6bc4ac881c8e, 2016-07-28 (annotated)

Committer:
ebrus
Date:
Thu Jul 28 15:56:34 2016 +0000
Revision:
0:6bc4ac881c8e
1;

Who changed what in which revision?

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ebrus 0:6bc4ac881c8e 1 /* mbed Microcontroller Library
ebrus 0:6bc4ac881c8e 2 * Copyright (c) 2014, STMicroelectronics
ebrus 0:6bc4ac881c8e 3 * All rights reserved.
ebrus 0:6bc4ac881c8e 4 *
ebrus 0:6bc4ac881c8e 5 * Redistribution and use in source and binary forms, with or without
ebrus 0:6bc4ac881c8e 6 * modification, are permitted provided that the following conditions are met:
ebrus 0:6bc4ac881c8e 7 *
ebrus 0:6bc4ac881c8e 8 * 1. Redistributions of source code must retain the above copyright notice,
ebrus 0:6bc4ac881c8e 9 * this list of conditions and the following disclaimer.
ebrus 0:6bc4ac881c8e 10 * 2. Redistributions in binary form must reproduce the above copyright notice,
ebrus 0:6bc4ac881c8e 11 * this list of conditions and the following disclaimer in the documentation
ebrus 0:6bc4ac881c8e 12 * and/or other materials provided with the distribution.
ebrus 0:6bc4ac881c8e 13 * 3. Neither the name of STMicroelectronics nor the names of its contributors
ebrus 0:6bc4ac881c8e 14 * may be used to endorse or promote products derived from this software
ebrus 0:6bc4ac881c8e 15 * without specific prior written permission.
ebrus 0:6bc4ac881c8e 16 *
ebrus 0:6bc4ac881c8e 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
ebrus 0:6bc4ac881c8e 18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
ebrus 0:6bc4ac881c8e 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
ebrus 0:6bc4ac881c8e 20 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
ebrus 0:6bc4ac881c8e 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
ebrus 0:6bc4ac881c8e 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
ebrus 0:6bc4ac881c8e 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
ebrus 0:6bc4ac881c8e 24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
ebrus 0:6bc4ac881c8e 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
ebrus 0:6bc4ac881c8e 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
ebrus 0:6bc4ac881c8e 27 */
ebrus 0:6bc4ac881c8e 28 #include "mbed_assert.h"
ebrus 0:6bc4ac881c8e 29 #include "analogin_api.h"
ebrus 0:6bc4ac881c8e 30
ebrus 0:6bc4ac881c8e 31 #if DEVICE_ANALOGIN
ebrus 0:6bc4ac881c8e 32
ebrus 0:6bc4ac881c8e 33 #include "wait_api.h"
ebrus 0:6bc4ac881c8e 34 #include "cmsis.h"
ebrus 0:6bc4ac881c8e 35 #include "pinmap.h"
ebrus 0:6bc4ac881c8e 36
ebrus 0:6bc4ac881c8e 37 static const PinMap PinMap_ADC[] = {
ebrus 0:6bc4ac881c8e 38 {PA_0, ADC_1, STM_PIN_DATA(STM_MODE_ANALOG, GPIO_NOPULL, 0)}, // ADC1_IN0
ebrus 0:6bc4ac881c8e 39 {PA_1, ADC_1, STM_PIN_DATA(STM_MODE_ANALOG, GPIO_NOPULL, 0)}, // ADC1_IN1
ebrus 0:6bc4ac881c8e 40 {PA_2, ADC_1, STM_PIN_DATA(STM_MODE_ANALOG, GPIO_NOPULL, 0)}, // ADC1_IN2
ebrus 0:6bc4ac881c8e 41 {PA_3, ADC_1, STM_PIN_DATA(STM_MODE_ANALOG, GPIO_NOPULL, 0)}, // ADC1_IN3
ebrus 0:6bc4ac881c8e 42 {PA_4, ADC_1, STM_PIN_DATA(STM_MODE_ANALOG, GPIO_NOPULL, 0)}, // ADC1_IN4
ebrus 0:6bc4ac881c8e 43 {PA_5, ADC_1, STM_PIN_DATA(STM_MODE_ANALOG, GPIO_NOPULL, 0)}, // ADC1_IN5
ebrus 0:6bc4ac881c8e 44 {PA_6, ADC_1, STM_PIN_DATA(STM_MODE_ANALOG, GPIO_NOPULL, 0)}, // ADC1_IN6
ebrus 0:6bc4ac881c8e 45 {PA_7, ADC_1, STM_PIN_DATA(STM_MODE_ANALOG, GPIO_NOPULL, 0)}, // ADC1_IN7
ebrus 0:6bc4ac881c8e 46 {PB_0, ADC_1, STM_PIN_DATA(STM_MODE_ANALOG, GPIO_NOPULL, 0)}, // ADC1_IN8
ebrus 0:6bc4ac881c8e 47 {PB_1, ADC_1, STM_PIN_DATA(STM_MODE_ANALOG, GPIO_NOPULL, 0)}, // ADC1_IN9
ebrus 0:6bc4ac881c8e 48 {PC_0, ADC_1, STM_PIN_DATA(STM_MODE_ANALOG, GPIO_NOPULL, 0)}, // ADC1_IN10
ebrus 0:6bc4ac881c8e 49 {PC_1, ADC_1, STM_PIN_DATA(STM_MODE_ANALOG, GPIO_NOPULL, 0)}, // ADC1_IN11
ebrus 0:6bc4ac881c8e 50 {PC_2, ADC_1, STM_PIN_DATA(STM_MODE_ANALOG, GPIO_NOPULL, 0)}, // ADC1_IN12
ebrus 0:6bc4ac881c8e 51 {PC_3, ADC_1, STM_PIN_DATA(STM_MODE_ANALOG, GPIO_NOPULL, 0)}, // ADC1_IN13
ebrus 0:6bc4ac881c8e 52 {PC_4, ADC_1, STM_PIN_DATA(STM_MODE_ANALOG, GPIO_NOPULL, 0)}, // ADC1_IN14
ebrus 0:6bc4ac881c8e 53 {PC_5, ADC_1, STM_PIN_DATA(STM_MODE_ANALOG, GPIO_NOPULL, 0)}, // ADC1_IN15
ebrus 0:6bc4ac881c8e 54 {NC, NC, 0}
ebrus 0:6bc4ac881c8e 55 };
ebrus 0:6bc4ac881c8e 56
ebrus 0:6bc4ac881c8e 57 ADC_HandleTypeDef AdcHandle;
ebrus 0:6bc4ac881c8e 58
ebrus 0:6bc4ac881c8e 59 int adc_inited = 0;
ebrus 0:6bc4ac881c8e 60
ebrus 0:6bc4ac881c8e 61 void analogin_init(analogin_t *obj, PinName pin) {
ebrus 0:6bc4ac881c8e 62 // Get the peripheral name from the pin and assign it to the object
ebrus 0:6bc4ac881c8e 63 obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
ebrus 0:6bc4ac881c8e 64 MBED_ASSERT(obj->adc != (ADCName)NC);
ebrus 0:6bc4ac881c8e 65
ebrus 0:6bc4ac881c8e 66 // Configure GPIO
ebrus 0:6bc4ac881c8e 67 pinmap_pinout(pin, PinMap_ADC);
ebrus 0:6bc4ac881c8e 68
ebrus 0:6bc4ac881c8e 69 // Save pin number for the read function
ebrus 0:6bc4ac881c8e 70 obj->pin = pin;
ebrus 0:6bc4ac881c8e 71
ebrus 0:6bc4ac881c8e 72 // The ADC initialization is done once
ebrus 0:6bc4ac881c8e 73 if (adc_inited == 0) {
ebrus 0:6bc4ac881c8e 74 adc_inited = 1;
ebrus 0:6bc4ac881c8e 75
ebrus 0:6bc4ac881c8e 76 AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
ebrus 0:6bc4ac881c8e 77
ebrus 0:6bc4ac881c8e 78 // Enable ADC clock
ebrus 0:6bc4ac881c8e 79 __ADC1_CLK_ENABLE();
ebrus 0:6bc4ac881c8e 80
ebrus 0:6bc4ac881c8e 81 // Configure ADC
ebrus 0:6bc4ac881c8e 82 AdcHandle.Init.OversamplingMode = DISABLE;
ebrus 0:6bc4ac881c8e 83 AdcHandle.Init.ClockPrescaler = ADC_CLOCKPRESCALER_PCLK_DIV2; // ADCCLK = 8 MHz (HSI 16 MHz / 2)
ebrus 0:6bc4ac881c8e 84 AdcHandle.Init.Resolution = ADC_RESOLUTION12b;
ebrus 0:6bc4ac881c8e 85 AdcHandle.Init.SamplingTime = ADC_SAMPLETIME_7CYCLES_5;
ebrus 0:6bc4ac881c8e 86 AdcHandle.Init.ScanDirection = ADC_SCAN_DIRECTION_UPWARD;
ebrus 0:6bc4ac881c8e 87 AdcHandle.Init.DataAlign = ADC_DATAALIGN_RIGHT;
ebrus 0:6bc4ac881c8e 88 AdcHandle.Init.ContinuousConvMode = DISABLE;
ebrus 0:6bc4ac881c8e 89 AdcHandle.Init.DiscontinuousConvMode = DISABLE;
ebrus 0:6bc4ac881c8e 90 AdcHandle.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIG_EDGE_NONE;
ebrus 0:6bc4ac881c8e 91 AdcHandle.Init.ExternalTrigConv = ADC_EXTERNALTRIG0_T6_TRGO; // Not used here
ebrus 0:6bc4ac881c8e 92 AdcHandle.Init.DMAContinuousRequests = DISABLE;
ebrus 0:6bc4ac881c8e 93 AdcHandle.Init.EOCSelection = EOC_SINGLE_CONV;
ebrus 0:6bc4ac881c8e 94 AdcHandle.Init.Overrun = OVR_DATA_PRESERVED;
ebrus 0:6bc4ac881c8e 95 AdcHandle.Init.LowPowerAutoWait = ENABLE;
ebrus 0:6bc4ac881c8e 96 AdcHandle.Init.LowPowerFrequencyMode = DISABLE; // To be enabled only if ADC clock < 2.8 MHz
ebrus 0:6bc4ac881c8e 97 AdcHandle.Init.LowPowerAutoOff = DISABLE;
ebrus 0:6bc4ac881c8e 98 HAL_ADC_Init(&AdcHandle);
ebrus 0:6bc4ac881c8e 99
ebrus 0:6bc4ac881c8e 100 // Calibration
ebrus 0:6bc4ac881c8e 101 HAL_ADCEx_Calibration_Start(&AdcHandle, ADC_SINGLE_ENDED);
ebrus 0:6bc4ac881c8e 102
ebrus 0:6bc4ac881c8e 103 __HAL_ADC_ENABLE(&AdcHandle);
ebrus 0:6bc4ac881c8e 104 }
ebrus 0:6bc4ac881c8e 105 }
ebrus 0:6bc4ac881c8e 106
ebrus 0:6bc4ac881c8e 107 static inline uint16_t adc_read(analogin_t *obj) {
ebrus 0:6bc4ac881c8e 108 ADC_ChannelConfTypeDef sConfig;
ebrus 0:6bc4ac881c8e 109
ebrus 0:6bc4ac881c8e 110 AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
ebrus 0:6bc4ac881c8e 111
ebrus 0:6bc4ac881c8e 112 // Configure ADC channel
ebrus 0:6bc4ac881c8e 113 switch (obj->pin) {
ebrus 0:6bc4ac881c8e 114 case PA_0:
ebrus 0:6bc4ac881c8e 115 sConfig.Channel = ADC_CHANNEL_0;
ebrus 0:6bc4ac881c8e 116 break;
ebrus 0:6bc4ac881c8e 117 case PA_1:
ebrus 0:6bc4ac881c8e 118 sConfig.Channel = ADC_CHANNEL_1;
ebrus 0:6bc4ac881c8e 119 break;
ebrus 0:6bc4ac881c8e 120 case PA_2:
ebrus 0:6bc4ac881c8e 121 sConfig.Channel = ADC_CHANNEL_2;
ebrus 0:6bc4ac881c8e 122 break;
ebrus 0:6bc4ac881c8e 123 case PA_3:
ebrus 0:6bc4ac881c8e 124 sConfig.Channel = ADC_CHANNEL_3;
ebrus 0:6bc4ac881c8e 125 break;
ebrus 0:6bc4ac881c8e 126 case PA_4:
ebrus 0:6bc4ac881c8e 127 sConfig.Channel = ADC_CHANNEL_4;
ebrus 0:6bc4ac881c8e 128 break;
ebrus 0:6bc4ac881c8e 129 case PA_5:
ebrus 0:6bc4ac881c8e 130 sConfig.Channel = ADC_CHANNEL_5;
ebrus 0:6bc4ac881c8e 131 break;
ebrus 0:6bc4ac881c8e 132 case PA_6:
ebrus 0:6bc4ac881c8e 133 sConfig.Channel = ADC_CHANNEL_6;
ebrus 0:6bc4ac881c8e 134 break;
ebrus 0:6bc4ac881c8e 135 case PA_7:
ebrus 0:6bc4ac881c8e 136 sConfig.Channel = ADC_CHANNEL_7;
ebrus 0:6bc4ac881c8e 137 break;
ebrus 0:6bc4ac881c8e 138 case PB_0:
ebrus 0:6bc4ac881c8e 139 sConfig.Channel = ADC_CHANNEL_8;
ebrus 0:6bc4ac881c8e 140 break;
ebrus 0:6bc4ac881c8e 141 case PB_1:
ebrus 0:6bc4ac881c8e 142 sConfig.Channel = ADC_CHANNEL_9;
ebrus 0:6bc4ac881c8e 143 break;
ebrus 0:6bc4ac881c8e 144 case PC_0:
ebrus 0:6bc4ac881c8e 145 sConfig.Channel = ADC_CHANNEL_10;
ebrus 0:6bc4ac881c8e 146 break;
ebrus 0:6bc4ac881c8e 147 case PC_1:
ebrus 0:6bc4ac881c8e 148 sConfig.Channel = ADC_CHANNEL_11;
ebrus 0:6bc4ac881c8e 149 break;
ebrus 0:6bc4ac881c8e 150 case PC_2:
ebrus 0:6bc4ac881c8e 151 sConfig.Channel = ADC_CHANNEL_12;
ebrus 0:6bc4ac881c8e 152 break;
ebrus 0:6bc4ac881c8e 153 case PC_3:
ebrus 0:6bc4ac881c8e 154 sConfig.Channel = ADC_CHANNEL_13;
ebrus 0:6bc4ac881c8e 155 break;
ebrus 0:6bc4ac881c8e 156 case PC_4:
ebrus 0:6bc4ac881c8e 157 sConfig.Channel = ADC_CHANNEL_14;
ebrus 0:6bc4ac881c8e 158 break;
ebrus 0:6bc4ac881c8e 159 case PC_5:
ebrus 0:6bc4ac881c8e 160 sConfig.Channel = ADC_CHANNEL_15;
ebrus 0:6bc4ac881c8e 161 break;
ebrus 0:6bc4ac881c8e 162 default:
ebrus 0:6bc4ac881c8e 163 return 0;
ebrus 0:6bc4ac881c8e 164 }
ebrus 0:6bc4ac881c8e 165
ebrus 0:6bc4ac881c8e 166 ADC1->CHSELR = 0; // [TODO] Workaround. To be removed after Cube driver is corrected.
ebrus 0:6bc4ac881c8e 167 HAL_ADC_ConfigChannel(&AdcHandle, &sConfig);
ebrus 0:6bc4ac881c8e 168
ebrus 0:6bc4ac881c8e 169 HAL_ADC_Start(&AdcHandle); // Start conversion
ebrus 0:6bc4ac881c8e 170
ebrus 0:6bc4ac881c8e 171 // Wait end of conversion and get value
ebrus 0:6bc4ac881c8e 172 if (HAL_ADC_PollForConversion(&AdcHandle, 10) == HAL_OK) {
ebrus 0:6bc4ac881c8e 173 return (HAL_ADC_GetValue(&AdcHandle));
ebrus 0:6bc4ac881c8e 174 } else {
ebrus 0:6bc4ac881c8e 175 return 0;
ebrus 0:6bc4ac881c8e 176 }
ebrus 0:6bc4ac881c8e 177 }
ebrus 0:6bc4ac881c8e 178
ebrus 0:6bc4ac881c8e 179 uint16_t analogin_read_u16(analogin_t *obj) {
ebrus 0:6bc4ac881c8e 180 uint16_t value = adc_read(obj);
ebrus 0:6bc4ac881c8e 181 // 12-bit to 16-bit conversion
ebrus 0:6bc4ac881c8e 182 value = ((value << 4) & (uint16_t)0xFFF0) | ((value >> 8) & (uint16_t)0x000F);
ebrus 0:6bc4ac881c8e 183 return value;
ebrus 0:6bc4ac881c8e 184 }
ebrus 0:6bc4ac881c8e 185
ebrus 0:6bc4ac881c8e 186 float analogin_read(analogin_t *obj) {
ebrus 0:6bc4ac881c8e 187 uint16_t value = adc_read(obj);
ebrus 0:6bc4ac881c8e 188 return (float)value * (1.0f / (float)0xFFF); // 12 bits range
ebrus 0:6bc4ac881c8e 189 }
ebrus 0:6bc4ac881c8e 190
ebrus 0:6bc4ac881c8e 191 #endif