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_F100RB/analogin_api.c@323:9e901b0a5aa1, 2014-09-13 (annotated)

Committer:
shaoziyang
Date:
Sat Sep 13 14:25:46 2014 +0000
Revision:
323:9e901b0a5aa1
Parent:
227:7bd0639b8911 
test with CLOCK_SETUP = 0

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 126:549ba18ddd81 1 /* mbed Microcontroller Library
mbed_official 126:549ba18ddd81 2 * Copyright (c) 2014, STMicroelectronics
mbed_official 126:549ba18ddd81 3 * All rights reserved.
mbed_official 126:549ba18ddd81 4 *
mbed_official 126:549ba18ddd81 5 * Redistribution and use in source and binary forms, with or without
mbed_official 126:549ba18ddd81 6 * modification, are permitted provided that the following conditions are met:
mbed_official 126:549ba18ddd81 7 *
mbed_official 126:549ba18ddd81 8 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 126:549ba18ddd81 9 * this list of conditions and the following disclaimer.
mbed_official 126:549ba18ddd81 10 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 126:549ba18ddd81 11 * this list of conditions and the following disclaimer in the documentation
mbed_official 126:549ba18ddd81 12 * and/or other materials provided with the distribution.
mbed_official 126:549ba18ddd81 13 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 126:549ba18ddd81 14 * may be used to endorse or promote products derived from this software
mbed_official 126:549ba18ddd81 15 * without specific prior written permission.
mbed_official 126:549ba18ddd81 16 *
mbed_official 126:549ba18ddd81 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 126:549ba18ddd81 18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 126:549ba18ddd81 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 126:549ba18ddd81 20 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 126:549ba18ddd81 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 126:549ba18ddd81 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 126:549ba18ddd81 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 126:549ba18ddd81 24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 126:549ba18ddd81 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 126:549ba18ddd81 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 126:549ba18ddd81 27 */
mbed_official 227:7bd0639b8911 28 #include "mbed_assert.h"
mbed_official 126:549ba18ddd81 29 #include "analogin_api.h"
mbed_official 126:549ba18ddd81 30 #include "wait_api.h"
mbed_official 126:549ba18ddd81 31
mbed_official 126:549ba18ddd81 32 #if DEVICE_ANALOGIN
mbed_official 126:549ba18ddd81 33
mbed_official 126:549ba18ddd81 34 #include "cmsis.h"
mbed_official 126:549ba18ddd81 35 #include "pinmap.h"
mbed_official 126:549ba18ddd81 36
mbed_official 126:549ba18ddd81 37 static const PinMap PinMap_ADC[] = {
mbed_official 126:549ba18ddd81 38 {PA_0, ADC_1, STM_PIN_DATA(GPIO_Mode_AIN, 0)},
mbed_official 126:549ba18ddd81 39 {PA_1, ADC_1, STM_PIN_DATA(GPIO_Mode_AIN, 0)},
mbed_official 126:549ba18ddd81 40 {PA_4, ADC_1, STM_PIN_DATA(GPIO_Mode_AIN, 0)},
mbed_official 126:549ba18ddd81 41 {PB_0, ADC_1, STM_PIN_DATA(GPIO_Mode_AIN, 0)},
mbed_official 126:549ba18ddd81 42 {PC_1, ADC_1, STM_PIN_DATA(GPIO_Mode_AIN, 0)},
mbed_official 126:549ba18ddd81 43 {PC_0, ADC_1, STM_PIN_DATA(GPIO_Mode_AIN, 0)},
mbed_official 126:549ba18ddd81 44 {NC, NC, 0}
mbed_official 126:549ba18ddd81 45 };
mbed_official 126:549ba18ddd81 46
mbed_official 126:549ba18ddd81 47 int adc_inited = 0;
mbed_official 126:549ba18ddd81 48
mbed_official 126:549ba18ddd81 49 void analogin_init(analogin_t *obj, PinName pin) {
mbed_official 126:549ba18ddd81 50
mbed_official 126:549ba18ddd81 51 ADC_TypeDef *adc;
mbed_official 126:549ba18ddd81 52 ADC_InitTypeDef ADC_InitStructure;
mbed_official 126:549ba18ddd81 53
mbed_official 126:549ba18ddd81 54 // Get the peripheral name (ADC_1, ADC_2...) from the pin and assign it to the object
mbed_official 126:549ba18ddd81 55 obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
mbed_official 227:7bd0639b8911 56 MBED_ASSERT(obj->adc != (ADCName)NC);
mbed_official 126:549ba18ddd81 57
mbed_official 126:549ba18ddd81 58 // Configure GPIO
mbed_official 126:549ba18ddd81 59 pinmap_pinout(pin, PinMap_ADC);
mbed_official 126:549ba18ddd81 60
mbed_official 126:549ba18ddd81 61 // Save pin number for the read function
mbed_official 126:549ba18ddd81 62 obj->pin = pin;
mbed_official 126:549ba18ddd81 63
mbed_official 126:549ba18ddd81 64 // The ADC initialization is done once
mbed_official 126:549ba18ddd81 65 if (adc_inited == 0) {
mbed_official 126:549ba18ddd81 66 adc_inited = 1;
mbed_official 126:549ba18ddd81 67
mbed_official 126:549ba18ddd81 68 // Get ADC registers structure address
mbed_official 126:549ba18ddd81 69 adc = (ADC_TypeDef *)(obj->adc);
mbed_official 126:549ba18ddd81 70
mbed_official 126:549ba18ddd81 71 // Enable ADC clock
mbed_official 126:549ba18ddd81 72 RCC_ADCCLKConfig(RCC_PCLK2_Div4);
mbed_official 126:549ba18ddd81 73 RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
mbed_official 126:549ba18ddd81 74
mbed_official 126:549ba18ddd81 75 // Configure ADC
mbed_official 126:549ba18ddd81 76 ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
mbed_official 126:549ba18ddd81 77 ADC_InitStructure.ADC_ScanConvMode = DISABLE;
mbed_official 126:549ba18ddd81 78 ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
mbed_official 126:549ba18ddd81 79 ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
mbed_official 126:549ba18ddd81 80 ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
mbed_official 126:549ba18ddd81 81 ADC_InitStructure.ADC_NbrOfChannel = 1;
mbed_official 126:549ba18ddd81 82 ADC_Init(adc, &ADC_InitStructure);
mbed_official 126:549ba18ddd81 83
mbed_official 126:549ba18ddd81 84 // Enable ADC
mbed_official 126:549ba18ddd81 85 ADC_Cmd(adc, ENABLE);
mbed_official 126:549ba18ddd81 86
mbed_official 126:549ba18ddd81 87 // Calibrate ADC
mbed_official 126:549ba18ddd81 88 ADC_ResetCalibration(adc);
mbed_official 126:549ba18ddd81 89 while(ADC_GetResetCalibrationStatus(adc));
mbed_official 126:549ba18ddd81 90 ADC_StartCalibration(adc);
mbed_official 227:7bd0639b8911 91 while(ADC_GetCalibrationStatus(adc));
mbed_official 126:549ba18ddd81 92 }
mbed_official 126:549ba18ddd81 93 }
mbed_official 126:549ba18ddd81 94
mbed_official 126:549ba18ddd81 95 static inline uint16_t adc_read(analogin_t *obj) {
mbed_official 126:549ba18ddd81 96 // Get ADC registers structure address
mbed_official 126:549ba18ddd81 97 ADC_TypeDef *adc = (ADC_TypeDef *)(obj->adc);
mbed_official 126:549ba18ddd81 98
mbed_official 126:549ba18ddd81 99 // Configure ADC channel
mbed_official 126:549ba18ddd81 100 switch (obj->pin) {
mbed_official 126:549ba18ddd81 101 case PA_0:
mbed_official 126:549ba18ddd81 102 ADC_RegularChannelConfig(adc, ADC_Channel_0, 1, ADC_SampleTime_7Cycles5);
mbed_official 126:549ba18ddd81 103 break;
mbed_official 126:549ba18ddd81 104 case PA_1:
mbed_official 126:549ba18ddd81 105 ADC_RegularChannelConfig(adc, ADC_Channel_1, 1, ADC_SampleTime_7Cycles5);
mbed_official 126:549ba18ddd81 106 break;
mbed_official 126:549ba18ddd81 107 case PA_4:
mbed_official 126:549ba18ddd81 108 ADC_RegularChannelConfig(adc, ADC_Channel_4, 1, ADC_SampleTime_7Cycles5);
mbed_official 126:549ba18ddd81 109 break;
mbed_official 126:549ba18ddd81 110 case PB_0:
mbed_official 126:549ba18ddd81 111 ADC_RegularChannelConfig(adc, ADC_Channel_8, 1, ADC_SampleTime_7Cycles5);
mbed_official 126:549ba18ddd81 112 break;
mbed_official 126:549ba18ddd81 113 case PC_1:
mbed_official 126:549ba18ddd81 114 ADC_RegularChannelConfig(adc, ADC_Channel_11, 1, ADC_SampleTime_7Cycles5);
mbed_official 126:549ba18ddd81 115 break;
mbed_official 126:549ba18ddd81 116 case PC_0:
mbed_official 126:549ba18ddd81 117 ADC_RegularChannelConfig(adc, ADC_Channel_10, 1, ADC_SampleTime_7Cycles5);
mbed_official 126:549ba18ddd81 118 break;
mbed_official 126:549ba18ddd81 119 default:
mbed_official 126:549ba18ddd81 120 return 0;
mbed_official 126:549ba18ddd81 121 }
mbed_official 126:549ba18ddd81 122
mbed_official 126:549ba18ddd81 123 ADC_SoftwareStartConvCmd(adc, ENABLE); // Start conversion
mbed_official 126:549ba18ddd81 124
mbed_official 126:549ba18ddd81 125 while(ADC_GetFlagStatus(adc, ADC_FLAG_EOC) == RESET); // Wait end of conversion
mbed_official 126:549ba18ddd81 126
mbed_official 126:549ba18ddd81 127 return(ADC_GetConversionValue(adc)); // Get conversion value
mbed_official 126:549ba18ddd81 128 }
mbed_official 126:549ba18ddd81 129
mbed_official 126:549ba18ddd81 130 uint16_t analogin_read_u16(analogin_t *obj) {
mbed_official 126:549ba18ddd81 131 return(adc_read(obj));
mbed_official 126:549ba18ddd81 132 }
mbed_official 126:549ba18ddd81 133
mbed_official 126:549ba18ddd81 134 float analogin_read(analogin_t *obj) {
mbed_official 126:549ba18ddd81 135 uint16_t value = adc_read(obj);
mbed_official 126:549ba18ddd81 136 return (float)value * (1.0f / (float)0xFFF); // 12 bits range
mbed_official 126:549ba18ddd81 137 }
mbed_official 126:549ba18ddd81 138
mbed_official 126:549ba18ddd81 139 #endif