shao ziyang / mbed-src-kl05

mbed library sources

Dependents:   frdm_kl05z_gpio_test

Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_DISCO_F051R8/analogin_api.c@130:1dec54e4aec3, 2014-03-21 (annotated)

Committer:
mbed_official
Date:
Fri Mar 21 11:45:09 2014 +0000
Revision:
130:1dec54e4aec3
Child:
227:7bd0639b8911
Synchronized with git revision e5c9ff6781a4e277a5a454e5a0b037f76e31739d



Full URL: https://github.com/mbedmicro/mbed/commit/e5c9ff6781a4e277a5a454e5a0b037f76e31739d/



STM32F0-Discovery (STM32F051R8) initial port

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 130:1dec54e4aec3 1 /* mbed Microcontroller Library
mbed_official 130:1dec54e4aec3 2 * Copyright (c) 2014, STMicroelectronics
mbed_official 130:1dec54e4aec3 3 * All rights reserved.
mbed_official 130:1dec54e4aec3 4 *
mbed_official 130:1dec54e4aec3 5 * Redistribution and use in source and binary forms, with or without
mbed_official 130:1dec54e4aec3 6 * modification, are permitted provided that the following conditions are met:
mbed_official 130:1dec54e4aec3 7 *
mbed_official 130:1dec54e4aec3 8 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 130:1dec54e4aec3 9 * this list of conditions and the following disclaimer.
mbed_official 130:1dec54e4aec3 10 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 130:1dec54e4aec3 11 * this list of conditions and the following disclaimer in the documentation
mbed_official 130:1dec54e4aec3 12 * and/or other materials provided with the distribution.
mbed_official 130:1dec54e4aec3 13 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 130:1dec54e4aec3 14 * may be used to endorse or promote products derived from this software
mbed_official 130:1dec54e4aec3 15 * without specific prior written permission.
mbed_official 130:1dec54e4aec3 16 *
mbed_official 130:1dec54e4aec3 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 130:1dec54e4aec3 18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 130:1dec54e4aec3 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 130:1dec54e4aec3 20 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 130:1dec54e4aec3 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 130:1dec54e4aec3 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 130:1dec54e4aec3 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 130:1dec54e4aec3 24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 130:1dec54e4aec3 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 130:1dec54e4aec3 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 130:1dec54e4aec3 27 */
mbed_official 130:1dec54e4aec3 28 #include "analogin_api.h"
mbed_official 130:1dec54e4aec3 29 #include "wait_api.h"
mbed_official 130:1dec54e4aec3 30
mbed_official 130:1dec54e4aec3 31 #if DEVICE_ANALOGIN
mbed_official 130:1dec54e4aec3 32
mbed_official 130:1dec54e4aec3 33 #include "cmsis.h"
mbed_official 130:1dec54e4aec3 34 #include "pinmap.h"
mbed_official 130:1dec54e4aec3 35 #include "error.h"
mbed_official 130:1dec54e4aec3 36
mbed_official 130:1dec54e4aec3 37 static const PinMap PinMap_ADC[] = {
mbed_official 130:1dec54e4aec3 38 {PA_0, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN0
mbed_official 130:1dec54e4aec3 39 {PA_1, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN1
mbed_official 130:1dec54e4aec3 40 {PA_4, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN4
mbed_official 130:1dec54e4aec3 41 {PB_0, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN8
mbed_official 130:1dec54e4aec3 42 {PC_1, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN11
mbed_official 130:1dec54e4aec3 43 {PC_0, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN10
mbed_official 130:1dec54e4aec3 44 {NC, NC, 0}
mbed_official 130:1dec54e4aec3 45 };
mbed_official 130:1dec54e4aec3 46
mbed_official 130:1dec54e4aec3 47 int adc_inited = 0;
mbed_official 130:1dec54e4aec3 48
mbed_official 130:1dec54e4aec3 49 void analogin_init(analogin_t *obj, PinName pin) {
mbed_official 130:1dec54e4aec3 50
mbed_official 130:1dec54e4aec3 51 ADC_TypeDef *adc;
mbed_official 130:1dec54e4aec3 52 ADC_InitTypeDef ADC_InitStructure;
mbed_official 130:1dec54e4aec3 53
mbed_official 130:1dec54e4aec3 54 // Get the peripheral name (ADC_1, ADC_2...) from the pin and assign it to the object
mbed_official 130:1dec54e4aec3 55 obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
mbed_official 130:1dec54e4aec3 56
mbed_official 130:1dec54e4aec3 57 if (obj->adc == (ADCName)NC) {
mbed_official 130:1dec54e4aec3 58 error("ADC pin mapping failed");
mbed_official 130:1dec54e4aec3 59 }
mbed_official 130:1dec54e4aec3 60
mbed_official 130:1dec54e4aec3 61 // Configure GPIO
mbed_official 130:1dec54e4aec3 62 pinmap_pinout(pin, PinMap_ADC);
mbed_official 130:1dec54e4aec3 63
mbed_official 130:1dec54e4aec3 64 // Save pin number for the read function
mbed_official 130:1dec54e4aec3 65 obj->pin = pin;
mbed_official 130:1dec54e4aec3 66
mbed_official 130:1dec54e4aec3 67 // The ADC initialization is done once
mbed_official 130:1dec54e4aec3 68 if (adc_inited == 0) {
mbed_official 130:1dec54e4aec3 69 adc_inited = 1;
mbed_official 130:1dec54e4aec3 70
mbed_official 130:1dec54e4aec3 71 // Get ADC registers structure address
mbed_official 130:1dec54e4aec3 72 adc = (ADC_TypeDef *)(obj->adc);
mbed_official 130:1dec54e4aec3 73
mbed_official 130:1dec54e4aec3 74 // Enable ADC clock
mbed_official 130:1dec54e4aec3 75 RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
mbed_official 130:1dec54e4aec3 76
mbed_official 130:1dec54e4aec3 77 // Configure ADC
mbed_official 130:1dec54e4aec3 78 ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
mbed_official 130:1dec54e4aec3 79 ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
mbed_official 130:1dec54e4aec3 80 ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
mbed_official 130:1dec54e4aec3 81 ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T1_TRGO;
mbed_official 130:1dec54e4aec3 82 ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
mbed_official 130:1dec54e4aec3 83 ADC_InitStructure.ADC_ScanDirection = ADC_ScanDirection_Upward;
mbed_official 130:1dec54e4aec3 84 ADC_Init(adc, &ADC_InitStructure);
mbed_official 130:1dec54e4aec3 85
mbed_official 130:1dec54e4aec3 86 // Calibrate ADC
mbed_official 130:1dec54e4aec3 87 ADC_GetCalibrationFactor(adc);
mbed_official 130:1dec54e4aec3 88
mbed_official 130:1dec54e4aec3 89 // Enable ADC
mbed_official 130:1dec54e4aec3 90 ADC_Cmd(adc, ENABLE);
mbed_official 130:1dec54e4aec3 91 }
mbed_official 130:1dec54e4aec3 92 }
mbed_official 130:1dec54e4aec3 93
mbed_official 130:1dec54e4aec3 94 static inline uint16_t adc_read(analogin_t *obj) {
mbed_official 130:1dec54e4aec3 95 // Get ADC registers structure address
mbed_official 130:1dec54e4aec3 96 ADC_TypeDef *adc = (ADC_TypeDef *)(obj->adc);
mbed_official 130:1dec54e4aec3 97
mbed_official 130:1dec54e4aec3 98 adc->CHSELR = 0; // Clear all channels first
mbed_official 130:1dec54e4aec3 99
mbed_official 130:1dec54e4aec3 100 // Configure ADC channel
mbed_official 130:1dec54e4aec3 101 switch (obj->pin) {
mbed_official 130:1dec54e4aec3 102 case PA_0:
mbed_official 130:1dec54e4aec3 103 ADC_ChannelConfig(adc, ADC_Channel_0, ADC_SampleTime_7_5Cycles);
mbed_official 130:1dec54e4aec3 104 break;
mbed_official 130:1dec54e4aec3 105 case PA_1:
mbed_official 130:1dec54e4aec3 106 ADC_ChannelConfig(adc, ADC_Channel_1, ADC_SampleTime_7_5Cycles);
mbed_official 130:1dec54e4aec3 107 break;
mbed_official 130:1dec54e4aec3 108 case PA_4:
mbed_official 130:1dec54e4aec3 109 ADC_ChannelConfig(adc, ADC_Channel_4, ADC_SampleTime_7_5Cycles);
mbed_official 130:1dec54e4aec3 110 break;
mbed_official 130:1dec54e4aec3 111 case PB_0:
mbed_official 130:1dec54e4aec3 112 ADC_ChannelConfig(adc, ADC_Channel_8, ADC_SampleTime_7_5Cycles);
mbed_official 130:1dec54e4aec3 113 break;
mbed_official 130:1dec54e4aec3 114 case PC_1:
mbed_official 130:1dec54e4aec3 115 ADC_ChannelConfig(adc, ADC_Channel_11, ADC_SampleTime_7_5Cycles);
mbed_official 130:1dec54e4aec3 116 break;
mbed_official 130:1dec54e4aec3 117 case PC_0:
mbed_official 130:1dec54e4aec3 118 ADC_ChannelConfig(adc, ADC_Channel_10, ADC_SampleTime_7_5Cycles);
mbed_official 130:1dec54e4aec3 119 break;
mbed_official 130:1dec54e4aec3 120 default:
mbed_official 130:1dec54e4aec3 121 return 0;
mbed_official 130:1dec54e4aec3 122 }
mbed_official 130:1dec54e4aec3 123
mbed_official 130:1dec54e4aec3 124 while(!ADC_GetFlagStatus(adc, ADC_FLAG_ADRDY)); // Wait ADC ready
mbed_official 130:1dec54e4aec3 125
mbed_official 130:1dec54e4aec3 126 ADC_StartOfConversion(adc); // Start conversion
mbed_official 130:1dec54e4aec3 127
mbed_official 130:1dec54e4aec3 128 while(ADC_GetFlagStatus(adc, ADC_FLAG_EOC) == RESET); // Wait end of conversion
mbed_official 130:1dec54e4aec3 129
mbed_official 130:1dec54e4aec3 130 return(ADC_GetConversionValue(adc)); // Get conversion value
mbed_official 130:1dec54e4aec3 131 }
mbed_official 130:1dec54e4aec3 132
mbed_official 130:1dec54e4aec3 133 uint16_t analogin_read_u16(analogin_t *obj) {
mbed_official 130:1dec54e4aec3 134 return(adc_read(obj));
mbed_official 130:1dec54e4aec3 135 }
mbed_official 130:1dec54e4aec3 136
mbed_official 130:1dec54e4aec3 137 float analogin_read(analogin_t *obj) {
mbed_official 130:1dec54e4aec3 138 uint16_t value = adc_read(obj);
mbed_official 130:1dec54e4aec3 139 return (float)value * (1.0f / (float)0xFFF); // 12 bits range
mbed_official 130:1dec54e4aec3 140 }
mbed_official 130:1dec54e4aec3 141
mbed_official 130:1dec54e4aec3 142 #endif