lzbp li / mbed-src

mbed library sources

Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_NUCLEO_F103RB/analogin_api.c@227:7bd0639b8911, 2014-06-11 (annotated)

Committer:
mbed_official
Date:
Wed Jun 11 16:00:09 2014 +0100
Revision:
227:7bd0639b8911
Parent:
174:8bb9f3a33240
Child:
298:7557d401dbc3
Synchronized with git revision d58d532ebc0e0a96f4fffb8edefc082b71b964af



Full URL: https://github.com/mbedmicro/mbed/commit/d58d532ebc0e0a96f4fffb8edefc082b71b964af/

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 52:a51c77007319 1 /* mbed Microcontroller Library
mbed_official 70:c1fbde68b492 2 * Copyright (c) 2014, STMicroelectronics
mbed_official 70:c1fbde68b492 3 * All rights reserved.
mbed_official 52:a51c77007319 4 *
mbed_official 70:c1fbde68b492 5 * Redistribution and use in source and binary forms, with or without
mbed_official 70:c1fbde68b492 6 * modification, are permitted provided that the following conditions are met:
mbed_official 52:a51c77007319 7 *
mbed_official 70:c1fbde68b492 8 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 70:c1fbde68b492 9 * this list of conditions and the following disclaimer.
mbed_official 70:c1fbde68b492 10 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 70:c1fbde68b492 11 * this list of conditions and the following disclaimer in the documentation
mbed_official 70:c1fbde68b492 12 * and/or other materials provided with the distribution.
mbed_official 70:c1fbde68b492 13 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 70:c1fbde68b492 14 * may be used to endorse or promote products derived from this software
mbed_official 70:c1fbde68b492 15 * without specific prior written permission.
mbed_official 52:a51c77007319 16 *
mbed_official 70:c1fbde68b492 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 70:c1fbde68b492 18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 70:c1fbde68b492 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 70:c1fbde68b492 20 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 70:c1fbde68b492 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 70:c1fbde68b492 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 70:c1fbde68b492 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 70:c1fbde68b492 24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 70:c1fbde68b492 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 70:c1fbde68b492 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 52:a51c77007319 27 */
mbed_official 227:7bd0639b8911 28 #include "mbed_assert.h"
mbed_official 52:a51c77007319 29 #include "analogin_api.h"
mbed_official 52:a51c77007319 30
mbed_official 52:a51c77007319 31 #if DEVICE_ANALOGIN
mbed_official 52:a51c77007319 32
mbed_official 52:a51c77007319 33 #include "cmsis.h"
mbed_official 52:a51c77007319 34 #include "pinmap.h"
mbed_official 174:8bb9f3a33240 35 #include "wait_api.h"
mbed_official 52:a51c77007319 36
mbed_official 52:a51c77007319 37 static const PinMap PinMap_ADC[] = {
mbed_official 167:d5744491c362 38 {PA_0, ADC_1, STM_PIN_DATA(GPIO_Mode_AIN, 0)}, // ADC12_IN0
mbed_official 167:d5744491c362 39 {PA_1, ADC_1, STM_PIN_DATA(GPIO_Mode_AIN, 0)}, // ADC12_IN1
mbed_official 167:d5744491c362 40 {PA_2, ADC_1, STM_PIN_DATA(GPIO_Mode_AIN, 0)}, // ADC12_IN2
mbed_official 167:d5744491c362 41 {PA_3, ADC_1, STM_PIN_DATA(GPIO_Mode_AIN, 0)}, // ADC12_IN3
mbed_official 167:d5744491c362 42 {PA_4, ADC_1, STM_PIN_DATA(GPIO_Mode_AIN, 0)}, // ADC12_IN4
mbed_official 167:d5744491c362 43 {PA_5, ADC_1, STM_PIN_DATA(GPIO_Mode_AIN, 0)}, // ADC12_IN5
mbed_official 167:d5744491c362 44 {PA_6, ADC_1, STM_PIN_DATA(GPIO_Mode_AIN, 0)}, // ADC12_IN6
mbed_official 167:d5744491c362 45 {PA_7, ADC_1, STM_PIN_DATA(GPIO_Mode_AIN, 0)}, // ADC12_IN7
mbed_official 167:d5744491c362 46 {PB_0, ADC_1, STM_PIN_DATA(GPIO_Mode_AIN, 0)}, // ADC12_IN8
mbed_official 167:d5744491c362 47 {PB_1, ADC_1, STM_PIN_DATA(GPIO_Mode_AIN, 0)}, // ADC12_IN9
mbed_official 167:d5744491c362 48 {PC_0, ADC_1, STM_PIN_DATA(GPIO_Mode_AIN, 0)}, // ADC12_IN10
mbed_official 167:d5744491c362 49 {PC_1, ADC_1, STM_PIN_DATA(GPIO_Mode_AIN, 0)}, // ADC12_IN11
mbed_official 167:d5744491c362 50 {PC_2, ADC_1, STM_PIN_DATA(GPIO_Mode_AIN, 0)}, // ADC12_IN12
mbed_official 167:d5744491c362 51 {PC_3, ADC_1, STM_PIN_DATA(GPIO_Mode_AIN, 0)}, // ADC12_IN13
mbed_official 167:d5744491c362 52 {PC_4, ADC_1, STM_PIN_DATA(GPIO_Mode_AIN, 0)}, // ADC12_IN14
mbed_official 167:d5744491c362 53 {PC_5, ADC_1, STM_PIN_DATA(GPIO_Mode_AIN, 0)}, // ADC12_IN15
mbed_official 52:a51c77007319 54 {NC, NC, 0}
mbed_official 52:a51c77007319 55 };
mbed_official 52:a51c77007319 56
mbed_official 52:a51c77007319 57 int adc_inited = 0;
mbed_official 52:a51c77007319 58
mbed_official 52:a51c77007319 59 void analogin_init(analogin_t *obj, PinName pin) {
mbed_official 174:8bb9f3a33240 60 ADC_TypeDef *adc;
mbed_official 52:a51c77007319 61 ADC_InitTypeDef ADC_InitStructure;
mbed_official 174:8bb9f3a33240 62
mbed_official 167:d5744491c362 63 // Get the peripheral name from the pin and assign it to the object
mbed_official 52:a51c77007319 64 obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
mbed_official 227:7bd0639b8911 65 MBED_ASSERT(obj->adc != (ADCName)NC);
mbed_official 52:a51c77007319 66
mbed_official 52:a51c77007319 67 // Configure GPIO
mbed_official 52:a51c77007319 68 pinmap_pinout(pin, PinMap_ADC);
mbed_official 52:a51c77007319 69
mbed_official 52:a51c77007319 70 // Save pin number for the read function
mbed_official 52:a51c77007319 71 obj->pin = pin;
mbed_official 52:a51c77007319 72
mbed_official 52:a51c77007319 73 // The ADC initialization is done once
mbed_official 52:a51c77007319 74 if (adc_inited == 0) {
mbed_official 52:a51c77007319 75 adc_inited = 1;
mbed_official 52:a51c77007319 76
mbed_official 52:a51c77007319 77 // Get ADC registers structure address
mbed_official 52:a51c77007319 78 adc = (ADC_TypeDef *)(obj->adc);
mbed_official 174:8bb9f3a33240 79
mbed_official 167:d5744491c362 80 // Enable ADC clock (14 MHz maximum)
mbed_official 167:d5744491c362 81 // PCLK2 = 64 MHz --> ADC clock = 64/6 = 10.666 MHz
mbed_official 167:d5744491c362 82 RCC_ADCCLKConfig(RCC_PCLK2_Div6);
mbed_official 52:a51c77007319 83 RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
mbed_official 174:8bb9f3a33240 84
mbed_official 52:a51c77007319 85 // Configure ADC
mbed_official 167:d5744491c362 86 ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
mbed_official 167:d5744491c362 87 ADC_InitStructure.ADC_ScanConvMode = DISABLE;
mbed_official 52:a51c77007319 88 ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
mbed_official 167:d5744491c362 89 ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
mbed_official 167:d5744491c362 90 ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
mbed_official 167:d5744491c362 91 ADC_InitStructure.ADC_NbrOfChannel = 1;
mbed_official 52:a51c77007319 92 ADC_Init(adc, &ADC_InitStructure);
mbed_official 52:a51c77007319 93
mbed_official 52:a51c77007319 94 // Enable ADC
mbed_official 52:a51c77007319 95 ADC_Cmd(adc, ENABLE);
mbed_official 52:a51c77007319 96
mbed_official 52:a51c77007319 97 // Calibrate ADC
mbed_official 52:a51c77007319 98 ADC_ResetCalibration(adc);
mbed_official 174:8bb9f3a33240 99 while (ADC_GetResetCalibrationStatus(adc));
mbed_official 52:a51c77007319 100 ADC_StartCalibration(adc);
mbed_official 174:8bb9f3a33240 101 while (ADC_GetCalibrationStatus(adc));
mbed_official 52:a51c77007319 102 }
mbed_official 52:a51c77007319 103 }
mbed_official 52:a51c77007319 104
mbed_official 52:a51c77007319 105 static inline uint16_t adc_read(analogin_t *obj) {
mbed_official 174:8bb9f3a33240 106 // Get ADC registers structure address
mbed_official 174:8bb9f3a33240 107 ADC_TypeDef *adc = (ADC_TypeDef *)(obj->adc);
mbed_official 174:8bb9f3a33240 108 int channel = 0;
mbed_official 52:a51c77007319 109
mbed_official 174:8bb9f3a33240 110 // Configure ADC channel
mbed_official 174:8bb9f3a33240 111 switch (obj->pin) {
mbed_official 174:8bb9f3a33240 112 case PA_0:
mbed_official 174:8bb9f3a33240 113 channel = 0;
mbed_official 174:8bb9f3a33240 114 break;
mbed_official 174:8bb9f3a33240 115 case PA_1:
mbed_official 174:8bb9f3a33240 116 channel = 1;
mbed_official 174:8bb9f3a33240 117 break;
mbed_official 174:8bb9f3a33240 118 case PA_2:
mbed_official 174:8bb9f3a33240 119 channel = 2;
mbed_official 174:8bb9f3a33240 120 break;
mbed_official 174:8bb9f3a33240 121 case PA_3:
mbed_official 174:8bb9f3a33240 122 channel = 3;
mbed_official 174:8bb9f3a33240 123 break;
mbed_official 174:8bb9f3a33240 124 case PA_4:
mbed_official 174:8bb9f3a33240 125 channel = 4;
mbed_official 174:8bb9f3a33240 126 break;
mbed_official 174:8bb9f3a33240 127 case PA_5:
mbed_official 174:8bb9f3a33240 128 channel = 5;
mbed_official 174:8bb9f3a33240 129 break;
mbed_official 174:8bb9f3a33240 130 case PA_6:
mbed_official 174:8bb9f3a33240 131 channel = 6;
mbed_official 174:8bb9f3a33240 132 break;
mbed_official 174:8bb9f3a33240 133 case PA_7:
mbed_official 174:8bb9f3a33240 134 channel = 7;
mbed_official 174:8bb9f3a33240 135 break;
mbed_official 174:8bb9f3a33240 136 case PB_0:
mbed_official 174:8bb9f3a33240 137 channel = 8;
mbed_official 174:8bb9f3a33240 138 break;
mbed_official 174:8bb9f3a33240 139 case PB_1:
mbed_official 174:8bb9f3a33240 140 channel = 9;
mbed_official 174:8bb9f3a33240 141 break;
mbed_official 174:8bb9f3a33240 142 case PC_0:
mbed_official 174:8bb9f3a33240 143 channel = 10;
mbed_official 174:8bb9f3a33240 144 break;
mbed_official 174:8bb9f3a33240 145 case PC_1:
mbed_official 174:8bb9f3a33240 146 channel = 11;
mbed_official 174:8bb9f3a33240 147 break;
mbed_official 174:8bb9f3a33240 148 case PC_2:
mbed_official 174:8bb9f3a33240 149 channel = 12;
mbed_official 174:8bb9f3a33240 150 break;
mbed_official 174:8bb9f3a33240 151 case PC_3:
mbed_official 174:8bb9f3a33240 152 channel = 13;
mbed_official 174:8bb9f3a33240 153 break;
mbed_official 174:8bb9f3a33240 154 case PC_4:
mbed_official 174:8bb9f3a33240 155 channel = 14;
mbed_official 174:8bb9f3a33240 156 break;
mbed_official 174:8bb9f3a33240 157 case PC_5:
mbed_official 174:8bb9f3a33240 158 channel = 15;
mbed_official 174:8bb9f3a33240 159 break;
mbed_official 174:8bb9f3a33240 160 default:
mbed_official 174:8bb9f3a33240 161 return 0;
mbed_official 174:8bb9f3a33240 162 }
mbed_official 174:8bb9f3a33240 163
mbed_official 174:8bb9f3a33240 164 ADC_RegularChannelConfig(adc, channel, 1, ADC_SampleTime_7Cycles5);
mbed_official 174:8bb9f3a33240 165
mbed_official 174:8bb9f3a33240 166 ADC_SoftwareStartConvCmd(adc, ENABLE); // Start conversion
mbed_official 174:8bb9f3a33240 167
mbed_official 174:8bb9f3a33240 168 while (ADC_GetFlagStatus(adc, ADC_FLAG_EOC) == RESET); // Wait end of conversion
mbed_official 174:8bb9f3a33240 169
mbed_official 174:8bb9f3a33240 170 return (ADC_GetConversionValue(adc)); // Get conversion value
mbed_official 52:a51c77007319 171 }
mbed_official 52:a51c77007319 172
mbed_official 52:a51c77007319 173 uint16_t analogin_read_u16(analogin_t *obj) {
mbed_official 174:8bb9f3a33240 174 return (adc_read(obj));
mbed_official 52:a51c77007319 175 }
mbed_official 52:a51c77007319 176
mbed_official 52:a51c77007319 177 float analogin_read(analogin_t *obj) {
mbed_official 174:8bb9f3a33240 178 uint16_t value = adc_read(obj);
mbed_official 174:8bb9f3a33240 179 return (float)value * (1.0f / (float)0xFFF); // 12 bits range
mbed_official 52:a51c77007319 180 }
mbed_official 52:a51c77007319 181
mbed_official 52:a51c77007319 182 #endif