gabriel della-monica / mbed-src

mbed library sources

Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_DISCO_L053C8/analogin_api.c@439:c4382fcbbaed, 2014-12-15 (annotated)

Committer:
mbed_official
Date:
Mon Dec 15 09:30:07 2014 +0000
Revision:
439:c4382fcbbaed
Parent:
376:cb4d9db17537 
Synchronized with git revision 6172cbea1a558a9a2ebbd965e77f83a9ceeec670



Full URL: https://github.com/mbedmicro/mbed/commit/6172cbea1a558a9a2ebbd965e77f83a9ceeec670/



Targets: DISCO_L053C8 - update from nucleo latest changes

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 376:cb4d9db17537 1 /* mbed Microcontroller Library
mbed_official 376:cb4d9db17537 2 * Copyright (c) 2014, STMicroelectronics
mbed_official 376:cb4d9db17537 3 * All rights reserved.
mbed_official 376:cb4d9db17537 4 *
mbed_official 376:cb4d9db17537 5 * Redistribution and use in source and binary forms, with or without
mbed_official 376:cb4d9db17537 6 * modification, are permitted provided that the following conditions are met:
mbed_official 376:cb4d9db17537 7 *
mbed_official 376:cb4d9db17537 8 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 376:cb4d9db17537 9 * this list of conditions and the following disclaimer.
mbed_official 376:cb4d9db17537 10 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 376:cb4d9db17537 11 * this list of conditions and the following disclaimer in the documentation
mbed_official 376:cb4d9db17537 12 * and/or other materials provided with the distribution.
mbed_official 376:cb4d9db17537 13 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 376:cb4d9db17537 14 * may be used to endorse or promote products derived from this software
mbed_official 376:cb4d9db17537 15 * without specific prior written permission.
mbed_official 376:cb4d9db17537 16 *
mbed_official 376:cb4d9db17537 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 376:cb4d9db17537 18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 376:cb4d9db17537 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 376:cb4d9db17537 20 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 376:cb4d9db17537 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 376:cb4d9db17537 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 376:cb4d9db17537 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 376:cb4d9db17537 24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 376:cb4d9db17537 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 376:cb4d9db17537 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 376:cb4d9db17537 27 */
mbed_official 376:cb4d9db17537 28 #include "mbed_assert.h"
mbed_official 376:cb4d9db17537 29 #include "analogin_api.h"
mbed_official 376:cb4d9db17537 30
mbed_official 376:cb4d9db17537 31 #if DEVICE_ANALOGIN
mbed_official 376:cb4d9db17537 32
mbed_official 376:cb4d9db17537 33 #include "wait_api.h"
mbed_official 376:cb4d9db17537 34 #include "cmsis.h"
mbed_official 376:cb4d9db17537 35 #include "pinmap.h"
mbed_official 439:c4382fcbbaed 36 #include "PeripheralPins.h"
mbed_official 376:cb4d9db17537 37
mbed_official 376:cb4d9db17537 38 ADC_HandleTypeDef AdcHandle;
mbed_official 376:cb4d9db17537 39
mbed_official 376:cb4d9db17537 40 int adc_inited = 0;
mbed_official 376:cb4d9db17537 41
mbed_official 439:c4382fcbbaed 42 void analogin_init(analogin_t *obj, PinName pin)
mbed_official 439:c4382fcbbaed 43 {
mbed_official 376:cb4d9db17537 44 // Get the peripheral name from the pin and assign it to the object
mbed_official 376:cb4d9db17537 45 obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
mbed_official 376:cb4d9db17537 46 MBED_ASSERT(obj->adc != (ADCName)NC);
mbed_official 376:cb4d9db17537 47
mbed_official 376:cb4d9db17537 48 // Configure GPIO
mbed_official 376:cb4d9db17537 49 pinmap_pinout(pin, PinMap_ADC);
mbed_official 376:cb4d9db17537 50
mbed_official 376:cb4d9db17537 51 // Save pin number for the read function
mbed_official 376:cb4d9db17537 52 obj->pin = pin;
mbed_official 376:cb4d9db17537 53
mbed_official 376:cb4d9db17537 54 // The ADC initialization is done once
mbed_official 376:cb4d9db17537 55 if (adc_inited == 0) {
mbed_official 376:cb4d9db17537 56 adc_inited = 1;
mbed_official 376:cb4d9db17537 57
mbed_official 376:cb4d9db17537 58 AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
mbed_official 376:cb4d9db17537 59
mbed_official 376:cb4d9db17537 60 // Enable ADC clock
mbed_official 376:cb4d9db17537 61 __ADC1_CLK_ENABLE();
mbed_official 376:cb4d9db17537 62
mbed_official 376:cb4d9db17537 63 // Configure ADC
mbed_official 376:cb4d9db17537 64 AdcHandle.Init.OversamplingMode = DISABLE;
mbed_official 376:cb4d9db17537 65 AdcHandle.Init.ClockPrescaler = ADC_CLOCKPRESCALER_PCLK_DIV1;
mbed_official 376:cb4d9db17537 66 AdcHandle.Init.Resolution = ADC_RESOLUTION12b;
mbed_official 376:cb4d9db17537 67 AdcHandle.Init.SamplingTime = ADC_SAMPLETIME_41CYCLES_5;
mbed_official 376:cb4d9db17537 68 AdcHandle.Init.ScanDirection = ADC_SCAN_DIRECTION_UPWARD;
mbed_official 376:cb4d9db17537 69 AdcHandle.Init.DataAlign = ADC_DATAALIGN_RIGHT;
mbed_official 376:cb4d9db17537 70 AdcHandle.Init.ContinuousConvMode = DISABLE;
mbed_official 376:cb4d9db17537 71 AdcHandle.Init.DiscontinuousConvMode = DISABLE;
mbed_official 376:cb4d9db17537 72 AdcHandle.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIG_EDGE_NONE;
mbed_official 376:cb4d9db17537 73 AdcHandle.Init.ExternalTrigConv = ADC_EXTERNALTRIG0_T6_TRGO; // Not used here
mbed_official 376:cb4d9db17537 74 AdcHandle.Init.DMAContinuousRequests = DISABLE;
mbed_official 376:cb4d9db17537 75 AdcHandle.Init.EOCSelection = EOC_SINGLE_CONV;
mbed_official 376:cb4d9db17537 76 AdcHandle.Init.Overrun = OVR_DATA_OVERWRITTEN;
mbed_official 376:cb4d9db17537 77 AdcHandle.Init.LowPowerAutoWait = ENABLE;
mbed_official 376:cb4d9db17537 78 AdcHandle.Init.LowPowerFrequencyMode = DISABLE; // To be enabled only if ADC clock < 2.8 MHz
mbed_official 376:cb4d9db17537 79 AdcHandle.Init.LowPowerAutoOff = DISABLE;
mbed_official 376:cb4d9db17537 80 HAL_ADC_Init(&AdcHandle);
mbed_official 439:c4382fcbbaed 81
mbed_official 376:cb4d9db17537 82 // Calibration
mbed_official 376:cb4d9db17537 83 HAL_ADCEx_Calibration_Start(&AdcHandle, ADC_SINGLE_ENDED);
mbed_official 439:c4382fcbbaed 84
mbed_official 376:cb4d9db17537 85 __HAL_ADC_ENABLE(&AdcHandle);
mbed_official 376:cb4d9db17537 86 }
mbed_official 376:cb4d9db17537 87 }
mbed_official 376:cb4d9db17537 88
mbed_official 439:c4382fcbbaed 89 static inline uint16_t adc_read(analogin_t *obj)
mbed_official 439:c4382fcbbaed 90 {
mbed_official 376:cb4d9db17537 91 ADC_ChannelConfTypeDef sConfig;
mbed_official 376:cb4d9db17537 92
mbed_official 376:cb4d9db17537 93 AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
mbed_official 376:cb4d9db17537 94
mbed_official 376:cb4d9db17537 95 // Configure ADC channel
mbed_official 376:cb4d9db17537 96 switch (obj->pin) {
mbed_official 376:cb4d9db17537 97 case PA_0:
mbed_official 376:cb4d9db17537 98 sConfig.Channel = ADC_CHANNEL_0;
mbed_official 376:cb4d9db17537 99 break;
mbed_official 376:cb4d9db17537 100 case PA_1:
mbed_official 376:cb4d9db17537 101 sConfig.Channel = ADC_CHANNEL_1;
mbed_official 376:cb4d9db17537 102 break;
mbed_official 376:cb4d9db17537 103 case PA_2:
mbed_official 376:cb4d9db17537 104 sConfig.Channel = ADC_CHANNEL_2;
mbed_official 376:cb4d9db17537 105 break;
mbed_official 376:cb4d9db17537 106 case PA_3:
mbed_official 376:cb4d9db17537 107 sConfig.Channel = ADC_CHANNEL_3;
mbed_official 376:cb4d9db17537 108 break;
mbed_official 376:cb4d9db17537 109 case PA_4:
mbed_official 376:cb4d9db17537 110 sConfig.Channel = ADC_CHANNEL_4;
mbed_official 376:cb4d9db17537 111 break;
mbed_official 376:cb4d9db17537 112 case PA_5:
mbed_official 376:cb4d9db17537 113 sConfig.Channel = ADC_CHANNEL_5;
mbed_official 376:cb4d9db17537 114 break;
mbed_official 376:cb4d9db17537 115 case PA_6:
mbed_official 376:cb4d9db17537 116 sConfig.Channel = ADC_CHANNEL_6;
mbed_official 376:cb4d9db17537 117 break;
mbed_official 376:cb4d9db17537 118 case PA_7:
mbed_official 376:cb4d9db17537 119 sConfig.Channel = ADC_CHANNEL_7;
mbed_official 376:cb4d9db17537 120 break;
mbed_official 376:cb4d9db17537 121 case PB_0:
mbed_official 376:cb4d9db17537 122 sConfig.Channel = ADC_CHANNEL_8;
mbed_official 376:cb4d9db17537 123 break;
mbed_official 376:cb4d9db17537 124 case PB_1:
mbed_official 376:cb4d9db17537 125 sConfig.Channel = ADC_CHANNEL_9;
mbed_official 376:cb4d9db17537 126 break;
mbed_official 376:cb4d9db17537 127 case PC_0:
mbed_official 376:cb4d9db17537 128 sConfig.Channel = ADC_CHANNEL_10;
mbed_official 376:cb4d9db17537 129 break;
mbed_official 376:cb4d9db17537 130 case PC_1:
mbed_official 376:cb4d9db17537 131 sConfig.Channel = ADC_CHANNEL_11;
mbed_official 376:cb4d9db17537 132 break;
mbed_official 376:cb4d9db17537 133 case PC_2:
mbed_official 376:cb4d9db17537 134 sConfig.Channel = ADC_CHANNEL_12;
mbed_official 376:cb4d9db17537 135 break;
mbed_official 376:cb4d9db17537 136 case PC_3:
mbed_official 376:cb4d9db17537 137 sConfig.Channel = ADC_CHANNEL_13;
mbed_official 376:cb4d9db17537 138 break;
mbed_official 376:cb4d9db17537 139 case PC_4:
mbed_official 376:cb4d9db17537 140 sConfig.Channel = ADC_CHANNEL_14;
mbed_official 376:cb4d9db17537 141 break;
mbed_official 376:cb4d9db17537 142 case PC_5:
mbed_official 376:cb4d9db17537 143 sConfig.Channel = ADC_CHANNEL_15;
mbed_official 376:cb4d9db17537 144 break;
mbed_official 376:cb4d9db17537 145 default:
mbed_official 376:cb4d9db17537 146 return 0;
mbed_official 376:cb4d9db17537 147 }
mbed_official 376:cb4d9db17537 148
mbed_official 376:cb4d9db17537 149 ADC1->CHSELR = 0; // [TODO] Workaround. To be removed after Cube driver is corrected.
mbed_official 376:cb4d9db17537 150 HAL_ADC_ConfigChannel(&AdcHandle, &sConfig);
mbed_official 376:cb4d9db17537 151
mbed_official 376:cb4d9db17537 152 HAL_ADC_Start(&AdcHandle); // Start conversion
mbed_official 376:cb4d9db17537 153
mbed_official 376:cb4d9db17537 154 // Wait end of conversion and get value
mbed_official 376:cb4d9db17537 155 if (HAL_ADC_PollForConversion(&AdcHandle, 10) == HAL_OK) {
mbed_official 376:cb4d9db17537 156 return (HAL_ADC_GetValue(&AdcHandle));
mbed_official 376:cb4d9db17537 157 } else {
mbed_official 376:cb4d9db17537 158 return 0;
mbed_official 376:cb4d9db17537 159 }
mbed_official 376:cb4d9db17537 160 }
mbed_official 376:cb4d9db17537 161
mbed_official 439:c4382fcbbaed 162 uint16_t analogin_read_u16(analogin_t *obj)
mbed_official 439:c4382fcbbaed 163 {
mbed_official 376:cb4d9db17537 164 uint16_t value = adc_read(obj);
mbed_official 376:cb4d9db17537 165 // 12-bit to 16-bit conversion
mbed_official 376:cb4d9db17537 166 value = ((value << 4) & (uint16_t)0xFFF0) | ((value >> 8) & (uint16_t)0x000F);
mbed_official 376:cb4d9db17537 167 return value;
mbed_official 376:cb4d9db17537 168 }
mbed_official 376:cb4d9db17537 169
mbed_official 439:c4382fcbbaed 170 float analogin_read(analogin_t *obj)
mbed_official 439:c4382fcbbaed 171 {
mbed_official 376:cb4d9db17537 172 uint16_t value = adc_read(obj);
mbed_official 376:cb4d9db17537 173 return (float)value * (1.0f / (float)0xFFF); // 12 bits range
mbed_official 376:cb4d9db17537 174 }
mbed_official 376:cb4d9db17537 175
mbed_official 376:cb4d9db17537 176 #endif