lzbp li / mbed-src

mbed library sources

Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_NUCLEO_F103RB/analogin_api.c@402:09075a3b15e3, 2014-11-14 (annotated)

Committer:
mbed_official
Date:
Fri Nov 14 09:00:07 2014 +0000
Revision:
402:09075a3b15e3
Parent:
298:7557d401dbc3
Child:
414:4ec4c5b614b0
Synchronized with git revision dffeedc96e731e30785ca4a7842fb9769412bea1



Full URL: https://github.com/mbedmicro/mbed/commit/dffeedc96e731e30785ca4a7842fb9769412bea1/



Targets: add USBTX and USBRX pin definitions for targets that don't provide them

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 402:09075a3b15e3 59 void analogin_init(analogin_t *obj, PinName pin)
mbed_official 402:09075a3b15e3 60 {
mbed_official 174:8bb9f3a33240 61 ADC_TypeDef *adc;
mbed_official 52:a51c77007319 62 ADC_InitTypeDef ADC_InitStructure;
mbed_official 174:8bb9f3a33240 63
mbed_official 167:d5744491c362 64 // Get the peripheral name from the pin and assign it to the object
mbed_official 52:a51c77007319 65 obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
mbed_official 227:7bd0639b8911 66 MBED_ASSERT(obj->adc != (ADCName)NC);
mbed_official 52:a51c77007319 67
mbed_official 52:a51c77007319 68 // Configure GPIO
mbed_official 52:a51c77007319 69 pinmap_pinout(pin, PinMap_ADC);
mbed_official 52:a51c77007319 70
mbed_official 52:a51c77007319 71 // Save pin number for the read function
mbed_official 52:a51c77007319 72 obj->pin = pin;
mbed_official 52:a51c77007319 73
mbed_official 52:a51c77007319 74 // The ADC initialization is done once
mbed_official 52:a51c77007319 75 if (adc_inited == 0) {
mbed_official 52:a51c77007319 76 adc_inited = 1;
mbed_official 52:a51c77007319 77
mbed_official 52:a51c77007319 78 // Get ADC registers structure address
mbed_official 52:a51c77007319 79 adc = (ADC_TypeDef *)(obj->adc);
mbed_official 174:8bb9f3a33240 80
mbed_official 167:d5744491c362 81 // Enable ADC clock (14 MHz maximum)
mbed_official 167:d5744491c362 82 // PCLK2 = 64 MHz --> ADC clock = 64/6 = 10.666 MHz
mbed_official 167:d5744491c362 83 RCC_ADCCLKConfig(RCC_PCLK2_Div6);
mbed_official 52:a51c77007319 84 RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
mbed_official 174:8bb9f3a33240 85
mbed_official 52:a51c77007319 86 // Configure ADC
mbed_official 167:d5744491c362 87 ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
mbed_official 167:d5744491c362 88 ADC_InitStructure.ADC_ScanConvMode = DISABLE;
mbed_official 52:a51c77007319 89 ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
mbed_official 167:d5744491c362 90 ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
mbed_official 167:d5744491c362 91 ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
mbed_official 167:d5744491c362 92 ADC_InitStructure.ADC_NbrOfChannel = 1;
mbed_official 52:a51c77007319 93 ADC_Init(adc, &ADC_InitStructure);
mbed_official 52:a51c77007319 94
mbed_official 52:a51c77007319 95 // Enable ADC
mbed_official 52:a51c77007319 96 ADC_Cmd(adc, ENABLE);
mbed_official 52:a51c77007319 97
mbed_official 52:a51c77007319 98 // Calibrate ADC
mbed_official 52:a51c77007319 99 ADC_ResetCalibration(adc);
mbed_official 174:8bb9f3a33240 100 while (ADC_GetResetCalibrationStatus(adc));
mbed_official 52:a51c77007319 101 ADC_StartCalibration(adc);
mbed_official 174:8bb9f3a33240 102 while (ADC_GetCalibrationStatus(adc));
mbed_official 52:a51c77007319 103 }
mbed_official 52:a51c77007319 104 }
mbed_official 52:a51c77007319 105
mbed_official 402:09075a3b15e3 106 static inline uint16_t adc_read(analogin_t *obj)
mbed_official 402:09075a3b15e3 107 {
mbed_official 174:8bb9f3a33240 108 // Get ADC registers structure address
mbed_official 174:8bb9f3a33240 109 ADC_TypeDef *adc = (ADC_TypeDef *)(obj->adc);
mbed_official 174:8bb9f3a33240 110 int channel = 0;
mbed_official 52:a51c77007319 111
mbed_official 174:8bb9f3a33240 112 // Configure ADC channel
mbed_official 174:8bb9f3a33240 113 switch (obj->pin) {
mbed_official 174:8bb9f3a33240 114 case PA_0:
mbed_official 174:8bb9f3a33240 115 channel = 0;
mbed_official 174:8bb9f3a33240 116 break;
mbed_official 174:8bb9f3a33240 117 case PA_1:
mbed_official 174:8bb9f3a33240 118 channel = 1;
mbed_official 174:8bb9f3a33240 119 break;
mbed_official 174:8bb9f3a33240 120 case PA_2:
mbed_official 174:8bb9f3a33240 121 channel = 2;
mbed_official 174:8bb9f3a33240 122 break;
mbed_official 174:8bb9f3a33240 123 case PA_3:
mbed_official 174:8bb9f3a33240 124 channel = 3;
mbed_official 174:8bb9f3a33240 125 break;
mbed_official 174:8bb9f3a33240 126 case PA_4:
mbed_official 174:8bb9f3a33240 127 channel = 4;
mbed_official 174:8bb9f3a33240 128 break;
mbed_official 174:8bb9f3a33240 129 case PA_5:
mbed_official 174:8bb9f3a33240 130 channel = 5;
mbed_official 174:8bb9f3a33240 131 break;
mbed_official 174:8bb9f3a33240 132 case PA_6:
mbed_official 174:8bb9f3a33240 133 channel = 6;
mbed_official 174:8bb9f3a33240 134 break;
mbed_official 174:8bb9f3a33240 135 case PA_7:
mbed_official 174:8bb9f3a33240 136 channel = 7;
mbed_official 174:8bb9f3a33240 137 break;
mbed_official 174:8bb9f3a33240 138 case PB_0:
mbed_official 174:8bb9f3a33240 139 channel = 8;
mbed_official 174:8bb9f3a33240 140 break;
mbed_official 174:8bb9f3a33240 141 case PB_1:
mbed_official 174:8bb9f3a33240 142 channel = 9;
mbed_official 174:8bb9f3a33240 143 break;
mbed_official 174:8bb9f3a33240 144 case PC_0:
mbed_official 174:8bb9f3a33240 145 channel = 10;
mbed_official 174:8bb9f3a33240 146 break;
mbed_official 174:8bb9f3a33240 147 case PC_1:
mbed_official 174:8bb9f3a33240 148 channel = 11;
mbed_official 174:8bb9f3a33240 149 break;
mbed_official 174:8bb9f3a33240 150 case PC_2:
mbed_official 174:8bb9f3a33240 151 channel = 12;
mbed_official 174:8bb9f3a33240 152 break;
mbed_official 174:8bb9f3a33240 153 case PC_3:
mbed_official 174:8bb9f3a33240 154 channel = 13;
mbed_official 174:8bb9f3a33240 155 break;
mbed_official 174:8bb9f3a33240 156 case PC_4:
mbed_official 174:8bb9f3a33240 157 channel = 14;
mbed_official 174:8bb9f3a33240 158 break;
mbed_official 174:8bb9f3a33240 159 case PC_5:
mbed_official 174:8bb9f3a33240 160 channel = 15;
mbed_official 174:8bb9f3a33240 161 break;
mbed_official 174:8bb9f3a33240 162 default:
mbed_official 174:8bb9f3a33240 163 return 0;
mbed_official 174:8bb9f3a33240 164 }
mbed_official 174:8bb9f3a33240 165
mbed_official 174:8bb9f3a33240 166 ADC_RegularChannelConfig(adc, channel, 1, ADC_SampleTime_7Cycles5);
mbed_official 174:8bb9f3a33240 167
mbed_official 174:8bb9f3a33240 168 ADC_SoftwareStartConvCmd(adc, ENABLE); // Start conversion
mbed_official 174:8bb9f3a33240 169
mbed_official 174:8bb9f3a33240 170 while (ADC_GetFlagStatus(adc, ADC_FLAG_EOC) == RESET); // Wait end of conversion
mbed_official 174:8bb9f3a33240 171
mbed_official 174:8bb9f3a33240 172 return (ADC_GetConversionValue(adc)); // Get conversion value
mbed_official 52:a51c77007319 173 }
mbed_official 52:a51c77007319 174
mbed_official 402:09075a3b15e3 175 uint16_t analogin_read_u16(analogin_t *obj)
mbed_official 402:09075a3b15e3 176 {
mbed_official 298:7557d401dbc3 177 uint16_t value = adc_read(obj);
mbed_official 298:7557d401dbc3 178 // 12-bit to 16-bit conversion
mbed_official 298:7557d401dbc3 179 value = ((value << 4) & (uint16_t)0xFFF0) | ((value >> 8) & (uint16_t)0x000F);
mbed_official 298:7557d401dbc3 180 return value;
mbed_official 52:a51c77007319 181 }
mbed_official 52:a51c77007319 182
mbed_official 402:09075a3b15e3 183 float analogin_read(analogin_t *obj)
mbed_official 402:09075a3b15e3 184 {
mbed_official 174:8bb9f3a33240 185 uint16_t value = adc_read(obj);
mbed_official 174:8bb9f3a33240 186 return (float)value * (1.0f / (float)0xFFF); // 12 bits range
mbed_official 52:a51c77007319 187 }
mbed_official 52:a51c77007319 188
mbed_official 52:a51c77007319 189 #endif