WILLY BAYOT / anaDMA

analogIn with DMA

Dependents:   TDEMNucleo

analoginDMA_api.c@0:1f6ea9afd585, 2015-01-03 (annotated)

Committer:
willybayot
Date:
Sat Jan 03 09:42:26 2015 +0000
Revision:
0:1f6ea9afd585
Child:
1:4b275a292c9d
anaalogIN with DMA

Who changed what in which revision?

UserRevisionLine numberNew contents of line
willybayot 0:1f6ea9afd585 1 /* mbed Microcontroller Library
willybayot 0:1f6ea9afd585 2 * Copyright (c) 2014, STMicroelectronics
willybayot 0:1f6ea9afd585 3 * All rights reserved.
willybayot 0:1f6ea9afd585 4 *
willybayot 0:1f6ea9afd585 5 * Redistribution and use in source and binary forms, with or without
willybayot 0:1f6ea9afd585 6 * modification, are permitted provided that the following conditions are met:
willybayot 0:1f6ea9afd585 7 *
willybayot 0:1f6ea9afd585 8 * 1. Redistributions of source code must retain the above copyright notice,
willybayot 0:1f6ea9afd585 9 * this list of conditions and the following disclaimer.
willybayot 0:1f6ea9afd585 10 * 2. Redistributions in binary form must reproduce the above copyright notice,
willybayot 0:1f6ea9afd585 11 * this list of conditions and the following disclaimer in the documentation
willybayot 0:1f6ea9afd585 12 * and/or other materials provided with the distribution.
willybayot 0:1f6ea9afd585 13 * 3. Neither the name of STMicroelectronics nor the names of its contributors
willybayot 0:1f6ea9afd585 14 * may be used to endorse or promote products derived from this software
willybayot 0:1f6ea9afd585 15 * without specific prior written permission.
willybayot 0:1f6ea9afd585 16 *
willybayot 0:1f6ea9afd585 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
willybayot 0:1f6ea9afd585 18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
willybayot 0:1f6ea9afd585 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
willybayot 0:1f6ea9afd585 20 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
willybayot 0:1f6ea9afd585 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
willybayot 0:1f6ea9afd585 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
willybayot 0:1f6ea9afd585 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
willybayot 0:1f6ea9afd585 24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
willybayot 0:1f6ea9afd585 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
willybayot 0:1f6ea9afd585 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
willybayot 0:1f6ea9afd585 27 */
willybayot 0:1f6ea9afd585 28 #include "mbed_assert.h"
willybayot 0:1f6ea9afd585 29 #include "analogin_api.h"
willybayot 0:1f6ea9afd585 30
willybayot 0:1f6ea9afd585 31 #if DEVICE_ANALOGIN
willybayot 0:1f6ea9afd585 32
willybayot 0:1f6ea9afd585 33 #include "wait_api.h"
willybayot 0:1f6ea9afd585 34 #include "cmsis.h"
willybayot 0:1f6ea9afd585 35 #include "pinmap.h"
willybayot 0:1f6ea9afd585 36 #include "PeripheralPins.h"
willybayot 0:1f6ea9afd585 37
willybayot 0:1f6ea9afd585 38 ADC_HandleTypeDef AdcDMAHandle;
willybayot 0:1f6ea9afd585 39
willybayot 0:1f6ea9afd585 40 int adcDMA_inited = 0;
willybayot 0:1f6ea9afd585 41
willybayot 0:1f6ea9afd585 42 void analoginDMA_init(analogin_t *obj, PinName pin)
willybayot 0:1f6ea9afd585 43 {
willybayot 0:1f6ea9afd585 44 // Get the peripheral name from the pin and assign it to the object
willybayot 0:1f6ea9afd585 45 obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
willybayot 0:1f6ea9afd585 46 MBED_ASSERT(obj->adc != (ADCName)NC);
willybayot 0:1f6ea9afd585 47
willybayot 0:1f6ea9afd585 48 // Configure GPIO
willybayot 0:1f6ea9afd585 49 pinmap_pinout(pin, PinMap_ADC);
willybayot 0:1f6ea9afd585 50
willybayot 0:1f6ea9afd585 51 // Save pin number for the read function
willybayot 0:1f6ea9afd585 52 obj->pin = pin;
willybayot 0:1f6ea9afd585 53
willybayot 0:1f6ea9afd585 54 // The ADC initialization is done once
willybayot 0:1f6ea9afd585 55 if (adcDMA_inited == 0) {
willybayot 0:1f6ea9afd585 56 adcDMA_inited = 1;
willybayot 0:1f6ea9afd585 57
willybayot 0:1f6ea9afd585 58 // Enable ADC clock
willybayot 0:1f6ea9afd585 59 __ADC1_CLK_ENABLE();
willybayot 0:1f6ea9afd585 60
willybayot 0:1f6ea9afd585 61 // Configure ADC
willybayot 0:1f6ea9afd585 62 AdcDMAHandle.Instance = (ADC_TypeDef *)(obj->adc);
willybayot 0:1f6ea9afd585 63 AdcDMAHandle.Init.ClockPrescaler = ADC_CLOCKPRESCALER_PCLK_DIV2;
willybayot 0:1f6ea9afd585 64 AdcDMAHandle.Init.Resolution = ADC_RESOLUTION12b;
willybayot 0:1f6ea9afd585 65 AdcDMAHandle.Init.ScanConvMode = DISABLE;
willybayot 0:1f6ea9afd585 66 AdcDMAHandle.Init.ContinuousConvMode = DISABLE;
willybayot 0:1f6ea9afd585 67 AdcDMAHandle.Init.DiscontinuousConvMode = DISABLE;
willybayot 0:1f6ea9afd585 68 AdcDMAHandle.Init.NbrOfDiscConversion = 0;
willybayot 0:1f6ea9afd585 69 AdcDMAHandle.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
willybayot 0:1f6ea9afd585 70 AdcDMAHandle.Init.ExternalTrigConv = ADC_EXTERNALTRIGCONV_T1_CC1;
willybayot 0:1f6ea9afd585 71 AdcDMAHandle.Init.DataAlign = ADC_DATAALIGN_RIGHT;
willybayot 0:1f6ea9afd585 72 AdcDMAHandle.Init.NbrOfConversion = 1;
willybayot 0:1f6ea9afd585 73 AdcDMAHandle.Init.DMAContinuousRequests = DISABLE;
willybayot 0:1f6ea9afd585 74 AdcDMAHandle.Init.EOCSelection = DISABLE;
willybayot 0:1f6ea9afd585 75 HAL_ADC_Init(&AdcDMAHandle);
willybayot 0:1f6ea9afd585 76 }
willybayot 0:1f6ea9afd585 77 }
willybayot 0:1f6ea9afd585 78
willybayot 0:1f6ea9afd585 79 static inline uint16_t adc_read(analogin_t *obj)
willybayot 0:1f6ea9afd585 80 {
willybayot 0:1f6ea9afd585 81 ADC_ChannelConfTypeDef sConfig;
willybayot 0:1f6ea9afd585 82
willybayot 0:1f6ea9afd585 83 AdcDMAHandle.Instance = (ADC_TypeDef *)(obj->adc);
willybayot 0:1f6ea9afd585 84
willybayot 0:1f6ea9afd585 85 // Configure ADC channel
willybayot 0:1f6ea9afd585 86 sConfig.Rank = 1;
willybayot 0:1f6ea9afd585 87 sConfig.SamplingTime = ADC_SAMPLETIME_3CYCLES;
willybayot 0:1f6ea9afd585 88 sConfig.Offset = 0;
willybayot 0:1f6ea9afd585 89
willybayot 0:1f6ea9afd585 90 switch (obj->pin) {
willybayot 0:1f6ea9afd585 91 case PA_0:
willybayot 0:1f6ea9afd585 92 sConfig.Channel = ADC_CHANNEL_0;
willybayot 0:1f6ea9afd585 93 break;
willybayot 0:1f6ea9afd585 94 case PA_1:
willybayot 0:1f6ea9afd585 95 sConfig.Channel = ADC_CHANNEL_1;
willybayot 0:1f6ea9afd585 96 break;
willybayot 0:1f6ea9afd585 97 case PA_2:
willybayot 0:1f6ea9afd585 98 sConfig.Channel = ADC_CHANNEL_2;
willybayot 0:1f6ea9afd585 99 break;
willybayot 0:1f6ea9afd585 100 case PA_3:
willybayot 0:1f6ea9afd585 101 sConfig.Channel = ADC_CHANNEL_3;
willybayot 0:1f6ea9afd585 102 break;
willybayot 0:1f6ea9afd585 103 case PA_4:
willybayot 0:1f6ea9afd585 104 sConfig.Channel = ADC_CHANNEL_4;
willybayot 0:1f6ea9afd585 105 break;
willybayot 0:1f6ea9afd585 106 case PA_5:
willybayot 0:1f6ea9afd585 107 sConfig.Channel = ADC_CHANNEL_5;
willybayot 0:1f6ea9afd585 108 break;
willybayot 0:1f6ea9afd585 109 case PA_6:
willybayot 0:1f6ea9afd585 110 sConfig.Channel = ADC_CHANNEL_6;
willybayot 0:1f6ea9afd585 111 break;
willybayot 0:1f6ea9afd585 112 case PA_7:
willybayot 0:1f6ea9afd585 113 sConfig.Channel = ADC_CHANNEL_7;
willybayot 0:1f6ea9afd585 114 break;
willybayot 0:1f6ea9afd585 115 case PB_0:
willybayot 0:1f6ea9afd585 116 sConfig.Channel = ADC_CHANNEL_8;
willybayot 0:1f6ea9afd585 117 break;
willybayot 0:1f6ea9afd585 118 case PB_1:
willybayot 0:1f6ea9afd585 119 sConfig.Channel = ADC_CHANNEL_9;
willybayot 0:1f6ea9afd585 120 break;
willybayot 0:1f6ea9afd585 121 case PC_0:
willybayot 0:1f6ea9afd585 122 sConfig.Channel = ADC_CHANNEL_10;
willybayot 0:1f6ea9afd585 123 break;
willybayot 0:1f6ea9afd585 124 case PC_1:
willybayot 0:1f6ea9afd585 125 sConfig.Channel = ADC_CHANNEL_11;
willybayot 0:1f6ea9afd585 126 break;
willybayot 0:1f6ea9afd585 127 case PC_2:
willybayot 0:1f6ea9afd585 128 sConfig.Channel = ADC_CHANNEL_12;
willybayot 0:1f6ea9afd585 129 break;
willybayot 0:1f6ea9afd585 130 case PC_3:
willybayot 0:1f6ea9afd585 131 sConfig.Channel = ADC_CHANNEL_13;
willybayot 0:1f6ea9afd585 132 break;
willybayot 0:1f6ea9afd585 133 case PC_4:
willybayot 0:1f6ea9afd585 134 sConfig.Channel = ADC_CHANNEL_14;
willybayot 0:1f6ea9afd585 135 break;
willybayot 0:1f6ea9afd585 136 case PC_5:
willybayot 0:1f6ea9afd585 137 sConfig.Channel = ADC_CHANNEL_15;
willybayot 0:1f6ea9afd585 138 break;
willybayot 0:1f6ea9afd585 139 default:
willybayot 0:1f6ea9afd585 140 return 0;
willybayot 0:1f6ea9afd585 141 }
willybayot 0:1f6ea9afd585 142
willybayot 0:1f6ea9afd585 143 HAL_ADC_ConfigChannel(&AdcDMAHandle, &sConfig);
willybayot 0:1f6ea9afd585 144
willybayot 0:1f6ea9afd585 145 HAL_ADC_Start(&AdcDMAHandle); // Start conversion
willybayot 0:1f6ea9afd585 146
willybayot 0:1f6ea9afd585 147 // Wait end of conversion and get value
willybayot 0:1f6ea9afd585 148 if (HAL_ADC_PollForConversion(&AdcDMAHandle, 10) == HAL_OK) {
willybayot 0:1f6ea9afd585 149 return (HAL_ADC_GetValue(&AdcDMAHandle));
willybayot 0:1f6ea9afd585 150 } else {
willybayot 0:1f6ea9afd585 151 return 0;
willybayot 0:1f6ea9afd585 152 }
willybayot 0:1f6ea9afd585 153 }
willybayot 0:1f6ea9afd585 154
willybayot 0:1f6ea9afd585 155 uint16_t analogin_readdMA_u16(analogin_t *obj)
willybayot 0:1f6ea9afd585 156 {
willybayot 0:1f6ea9afd585 157 uint16_t value = adc_read(obj);
willybayot 0:1f6ea9afd585 158 // 12-bit to 16-bit conversion
willybayot 0:1f6ea9afd585 159 value = ((value << 4) & (uint16_t)0xFFF0) | ((value >> 8) & (uint16_t)0x000F);
willybayot 0:1f6ea9afd585 160 return value;
willybayot 0:1f6ea9afd585 161 }
willybayot 0:1f6ea9afd585 162
willybayot 0:1f6ea9afd585 163 float analoginDMA_read(analogin_t *obj)
willybayot 0:1f6ea9afd585 164 {
willybayot 0:1f6ea9afd585 165 uint16_t value = adc_read(obj);
willybayot 0:1f6ea9afd585 166 return (float)value * (1.0f / (float)0xFFF); // 12 bits range
willybayot 0:1f6ea9afd585 167 }
willybayot 0:1f6ea9afd585 168
willybayot 0:1f6ea9afd585 169 #endif