analogIn with DMA
analoginDMA_api.c@1:4b275a292c9d, 2015-01-03 (annotated)
- Committer:
- willybayot
- Date:
- Sat Jan 03 10:17:22 2015 +0000
- Revision:
- 1:4b275a292c9d
- Parent:
- 0:1f6ea9afd585
- Child:
- 2:08779d8f1873
analogIn with DMA
Who changed what in which revision?
User | Revision | Line number | New 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 | 1:4b275a292c9d | 29 | #include "analoginDMA_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 |