1 /* mbed Microcontroller Library
2 * Copyright (c) 2014, STMicroelectronics
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
8 * 1. Redistributions of source code must retain the above copyright notice,
9 * this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright notice,
11 * this list of conditions and the following disclaimer in the documentation
12 * and/or other materials provided with the distribution.
13 * 3. Neither the name of STMicroelectronics nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 #include "mbed_assert.h"
29 #include "analogin_api.h"
36 #include "PeripheralPins.h"
38 ADC_HandleTypeDef AdcHandle;
40 void analogin_init(analogin_t *obj, PinName pin)
42 static int adc1_inited = 0;
43 static int adc2_inited = 0;
45 // Get the peripheral name from the pin and assign it to the object
46 obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
47 MBED_ASSERT(obj->adc != (ADCName)NC);
50 pinmap_pinout(pin, PinMap_ADC);
52 // Save pin number for the read function
55 // Check if ADC is already initialized
56 if ((obj->adc == ADC_1) && adc1_inited) return;
57 if ((obj->adc == ADC_2) && adc2_inited) return;
58 if (obj->adc == ADC_1) adc1_inited = 1;
59 if (obj->adc == ADC_2) adc2_inited = 1;
65 AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
66 AdcHandle.Init.ClockPrescaler = ADC_CLOCKPRESCALER_PCLK_DIV2;
67 AdcHandle.Init.Resolution = ADC_RESOLUTION12b;
68 AdcHandle.Init.ScanConvMode = DISABLE;
69 AdcHandle.Init.ContinuousConvMode = DISABLE;
70 AdcHandle.Init.DiscontinuousConvMode = DISABLE;
71 AdcHandle.Init.NbrOfDiscConversion = 0;
72 AdcHandle.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
73 AdcHandle.Init.ExternalTrigConv = ADC_EXTERNALTRIGCONV_T1_CC1;
74 AdcHandle.Init.DataAlign = ADC_DATAALIGN_RIGHT;
75 AdcHandle.Init.NbrOfConversion = 1;
76 AdcHandle.Init.DMAContinuousRequests = DISABLE;
77 AdcHandle.Init.EOCSelection = DISABLE;
78 HAL_ADC_Init(&AdcHandle);
81 static inline uint16_t adc_read(analogin_t *obj)
83 ADC_ChannelConfTypeDef sConfig;
85 AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
87 // Configure ADC channel
88 sConfig.Rank = ADC_REGULAR_RANK_1;
89 sConfig.SamplingTime = ADC_SAMPLETIME_19CYCLES_5;
90 sConfig.SingleDiff = ADC_SINGLE_ENDED;
91 sConfig.OffsetNumber = ADC_OFFSET_NONE;
96 sConfig.Channel = ADC_CHANNEL_1;
99 sConfig.Channel = ADC_CHANNEL_2;
102 sConfig.Channel = ADC_CHANNEL_3;
105 sConfig.Channel = ADC_CHANNEL_4;
108 sConfig.Channel = ADC_CHANNEL_1;
111 sConfig.Channel = ADC_CHANNEL_2;
114 sConfig.Channel = ADC_CHANNEL_3;
117 sConfig.Channel = ADC_CHANNEL_4;
120 sConfig.Channel = ADC_CHANNEL_11;
123 sConfig.Channel = ADC_CHANNEL_12;
126 sConfig.Channel = ADC_CHANNEL_12;
129 sConfig.Channel = ADC_CHANNEL_13;
132 sConfig.Channel = ADC_CHANNEL_13;
135 sConfig.Channel = ADC_CHANNEL_14;
138 sConfig.Channel = ADC_CHANNEL_15;
141 sConfig.Channel = ADC_CHANNEL_6;
144 sConfig.Channel = ADC_CHANNEL_7;
147 sConfig.Channel = ADC_CHANNEL_8;
150 sConfig.Channel = ADC_CHANNEL_9;
153 sConfig.Channel = ADC_CHANNEL_5;
156 sConfig.Channel = ADC_CHANNEL_11;
162 HAL_ADC_ConfigChannel(&AdcHandle, &sConfig);
164 HAL_ADC_Start(&AdcHandle); // Start conversion
166 // Wait end of conversion and get value
167 if (HAL_ADC_PollForConversion(&AdcHandle, 10) == HAL_OK) {
168 return (HAL_ADC_GetValue(&AdcHandle));
174 uint16_t analogin_read_u16(analogin_t *obj)
176 uint16_t value = adc_read(obj);
177 // 12-bit to 16-bit conversion
178 value = ((value << 4) & (uint16_t)0xFFF0) | ((value >> 8) & (uint16_t)0x000F);
182 float analogin_read(analogin_t *obj)
184 uint16_t value = adc_read(obj);
185 return (float)value * (1.0f / (float)0xFFF); // 12 bits range