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"
37 static const PinMap PinMap_ADC[] = {
38 {PA_0, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN1
39 {PA_1, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN2
40 {PA_2, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN3
41 {PA_3, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN4
42 {PA_4, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN5
43 {PC_0, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN6
44 {PC_1, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN7
45 {PC_2, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN8
46 {PC_3, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN9
47 {PA_6, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN10
48 {PB_0, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN11
49 {PB_1, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN12
50 {PB_13, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN13
51 {PB_11, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN14
52 {PA_7, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN15
58 void analogin_init(analogin_t *obj, PinName pin) {
61 ADC_InitTypeDef ADC_InitStructure;
62 ADC_CommonInitTypeDef ADC_CommonInitStructure;
64 // Get the peripheral name from the pin and assign it to the object
65 obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
66 MBED_ASSERT(obj->adc == (ADCName)NC);
69 pinmap_pinout(pin, PinMap_ADC);
71 // Save pin number for the read function
74 // The ADC initialization is done once
75 if (adc_inited == 0) {
78 // Get ADC registers structure address
79 adc = (ADC_TypeDef *)(obj->adc);
82 RCC_ADCCLKConfig(RCC_ADC12PLLCLK_Div1);
83 RCC_AHBPeriphClockCmd(RCC_AHBPeriph_ADC12, ENABLE);
86 ADC_VoltageRegulatorCmd(adc, ENABLE);
88 ADC_SelectCalibrationMode(adc, ADC_CalibrationMode_Single);
89 ADC_StartCalibration(adc);
90 while (ADC_GetCalibrationStatus(adc) != RESET) {}
93 ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;
94 ADC_CommonInitStructure.ADC_Clock = ADC_Clock_AsynClkMode;
95 ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;
96 ADC_CommonInitStructure.ADC_DMAMode = ADC_DMAMode_OneShot;
97 ADC_CommonInitStructure.ADC_TwoSamplingDelay = 0;
98 ADC_CommonInit(adc, &ADC_CommonInitStructure);
100 ADC_InitStructure.ADC_ContinuousConvMode = ADC_ContinuousConvMode_Disable;
101 ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
102 ADC_InitStructure.ADC_ExternalTrigConvEvent = ADC_ExternalTrigConvEvent_0;
103 ADC_InitStructure.ADC_ExternalTrigEventEdge = ADC_ExternalTrigEventEdge_None;
104 ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
105 ADC_InitStructure.ADC_OverrunMode = ADC_OverrunMode_Disable;
106 ADC_InitStructure.ADC_AutoInjMode = ADC_AutoInjec_Disable;
107 ADC_InitStructure.ADC_NbrOfRegChannel = 1;
108 ADC_Init(adc, &ADC_InitStructure);
111 ADC_Cmd(adc, ENABLE);
113 while (!ADC_GetFlagStatus(adc, ADC_FLAG_RDY)) {}
117 static inline uint16_t adc_read(analogin_t *obj) {
118 // Get ADC registers structure address
119 ADC_TypeDef *adc = (ADC_TypeDef *)(obj->adc);
122 // Configure ADC channel
125 channel = ADC_Channel_1;
128 channel = ADC_Channel_2;
131 channel = ADC_Channel_3;
134 channel = ADC_Channel_4;
137 channel = ADC_Channel_5;
140 channel = ADC_Channel_6;
143 channel = ADC_Channel_7;
146 channel = ADC_Channel_8;
149 channel = ADC_Channel_9;
152 channel = ADC_Channel_10;
155 channel = ADC_Channel_11;
158 channel = ADC_Channel_12;
161 channel = ADC_Channel_13;
164 channel = ADC_Channel_14;
167 channel = ADC_Channel_15;
173 ADC_RegularChannelConfig(adc, channel, 1, ADC_SampleTime_7Cycles5);
175 ADC_StartConversion(adc); // Start conversion
177 while (ADC_GetFlagStatus(adc, ADC_FLAG_EOC) == RESET); // Wait end of conversion
179 return (ADC_GetConversionValue(adc)); // Get conversion value
182 uint16_t analogin_read_u16(analogin_t *obj) {
183 return (adc_read(obj));
186 float analogin_read(analogin_t *obj) {
187 uint16_t value = adc_read(obj);
188 return (float)value * (1.0f / (float)0xFFF); // 12 bits range