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_NUCLEO_F103RB/analogin_api.c@52:a51c77007319, 2013-12-02 (annotated)

Committer:
mbed_official
Date:
Mon Dec 02 11:30:05 2013 +0000
Revision:
52:a51c77007319
Child:
56:99eb381a3269
Synchronized with git revision 49df530ae72ce97ccc773d1f2c13b38e868e6abd



Full URL: https://github.com/mbedmicro/mbed/commit/49df530ae72ce97ccc773d1f2c13b38e868e6abd/



Add STMicroelectronics NUCLEO_F103RB target

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 52:a51c77007319 1 /* mbed Microcontroller Library
mbed_official 52:a51c77007319 2 * Copyright (c) 2006-2013 ARM Limited
mbed_official 52:a51c77007319 3 *
mbed_official 52:a51c77007319 4 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 52:a51c77007319 5 * you may not use this file except in compliance with the License.
mbed_official 52:a51c77007319 6 * You may obtain a copy of the License at
mbed_official 52:a51c77007319 7 *
mbed_official 52:a51c77007319 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 52:a51c77007319 9 *
mbed_official 52:a51c77007319 10 * Unless required by applicable law or agreed to in writing, software
mbed_official 52:a51c77007319 11 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 52:a51c77007319 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 52:a51c77007319 13 * See the License for the specific language governing permissions and
mbed_official 52:a51c77007319 14 * limitations under the License.
mbed_official 52:a51c77007319 15 */
mbed_official 52:a51c77007319 16 //==============================================================================
mbed_official 52:a51c77007319 17 // STM32F103
mbed_official 52:a51c77007319 18 //==============================================================================
mbed_official 52:a51c77007319 19 #include "analogin_api.h"
mbed_official 52:a51c77007319 20 #include "wait_api.h"
mbed_official 52:a51c77007319 21
mbed_official 52:a51c77007319 22 #if DEVICE_ANALOGIN
mbed_official 52:a51c77007319 23
mbed_official 52:a51c77007319 24 #include "cmsis.h"
mbed_official 52:a51c77007319 25 #include "pinmap.h"
mbed_official 52:a51c77007319 26 #include "error.h"
mbed_official 52:a51c77007319 27
mbed_official 52:a51c77007319 28 static const PinMap PinMap_ADC[] = {
mbed_official 52:a51c77007319 29 {PA_0, ADC_1, STM_PIN_DATA(GPIO_Mode_AIN, 0)},
mbed_official 52:a51c77007319 30 {PA_1, ADC_1, STM_PIN_DATA(GPIO_Mode_AIN, 0)},
mbed_official 52:a51c77007319 31 {PA_4, ADC_1, STM_PIN_DATA(GPIO_Mode_AIN, 0)},
mbed_official 52:a51c77007319 32 {PB_0, ADC_1, STM_PIN_DATA(GPIO_Mode_AIN, 0)},
mbed_official 52:a51c77007319 33 {PC_1, ADC_1, STM_PIN_DATA(GPIO_Mode_AIN, 0)},
mbed_official 52:a51c77007319 34 {PC_0, ADC_1, STM_PIN_DATA(GPIO_Mode_AIN, 0)},
mbed_official 52:a51c77007319 35 {NC, NC, 0}
mbed_official 52:a51c77007319 36 };
mbed_official 52:a51c77007319 37
mbed_official 52:a51c77007319 38 int adc_inited = 0;
mbed_official 52:a51c77007319 39
mbed_official 52:a51c77007319 40 void analogin_init(analogin_t *obj, PinName pin) {
mbed_official 52:a51c77007319 41
mbed_official 52:a51c77007319 42 ADC_TypeDef *adc;
mbed_official 52:a51c77007319 43 ADC_InitTypeDef ADC_InitStructure;
mbed_official 52:a51c77007319 44
mbed_official 52:a51c77007319 45 // Get the peripheral name (ADC_1, ADC_2...) from the pin and assign it to the object
mbed_official 52:a51c77007319 46 obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
mbed_official 52:a51c77007319 47
mbed_official 52:a51c77007319 48 if (obj->adc == (ADCName)NC) {
mbed_official 52:a51c77007319 49 error("ADC pin mapping failed");
mbed_official 52:a51c77007319 50 }
mbed_official 52:a51c77007319 51
mbed_official 52:a51c77007319 52 // Configure GPIO
mbed_official 52:a51c77007319 53 pinmap_pinout(pin, PinMap_ADC);
mbed_official 52:a51c77007319 54
mbed_official 52:a51c77007319 55 // Save pin number for the read function
mbed_official 52:a51c77007319 56 obj->pin = pin;
mbed_official 52:a51c77007319 57
mbed_official 52:a51c77007319 58 // The ADC initialization is done once
mbed_official 52:a51c77007319 59 if (adc_inited == 0) {
mbed_official 52:a51c77007319 60 adc_inited = 1;
mbed_official 52:a51c77007319 61
mbed_official 52:a51c77007319 62 // Get ADC registers structure address
mbed_official 52:a51c77007319 63 adc = (ADC_TypeDef *)(obj->adc);
mbed_official 52:a51c77007319 64
mbed_official 52:a51c77007319 65 // Enable ADC clock
mbed_official 52:a51c77007319 66 RCC_ADCCLKConfig(RCC_PCLK2_Div4);
mbed_official 52:a51c77007319 67 RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
mbed_official 52:a51c77007319 68
mbed_official 52:a51c77007319 69 // Configure ADC
mbed_official 52:a51c77007319 70 ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
mbed_official 52:a51c77007319 71 ADC_InitStructure.ADC_ScanConvMode = DISABLE;
mbed_official 52:a51c77007319 72 ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
mbed_official 52:a51c77007319 73 ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
mbed_official 52:a51c77007319 74 ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
mbed_official 52:a51c77007319 75 ADC_InitStructure.ADC_NbrOfChannel = 1;
mbed_official 52:a51c77007319 76 ADC_Init(adc, &ADC_InitStructure);
mbed_official 52:a51c77007319 77
mbed_official 52:a51c77007319 78 // Enable ADC
mbed_official 52:a51c77007319 79 ADC_Cmd(adc, ENABLE);
mbed_official 52:a51c77007319 80
mbed_official 52:a51c77007319 81 // Calibrate ADC
mbed_official 52:a51c77007319 82 ADC_ResetCalibration(adc);
mbed_official 52:a51c77007319 83 while(ADC_GetResetCalibrationStatus(adc));
mbed_official 52:a51c77007319 84 ADC_StartCalibration(adc);
mbed_official 52:a51c77007319 85 while(ADC_GetCalibrationStatus(adc));
mbed_official 52:a51c77007319 86 }
mbed_official 52:a51c77007319 87 }
mbed_official 52:a51c77007319 88
mbed_official 52:a51c77007319 89 static inline uint16_t adc_read(analogin_t *obj) {
mbed_official 52:a51c77007319 90 // Get ADC registers structure address
mbed_official 52:a51c77007319 91 ADC_TypeDef *adc = (ADC_TypeDef *)(obj->adc);
mbed_official 52:a51c77007319 92
mbed_official 52:a51c77007319 93 // Configure ADC channel
mbed_official 52:a51c77007319 94 switch (obj->pin) {
mbed_official 52:a51c77007319 95 case PA_0:
mbed_official 52:a51c77007319 96 ADC_RegularChannelConfig(adc, ADC_Channel_0, 1, ADC_SampleTime_7Cycles5);
mbed_official 52:a51c77007319 97 break;
mbed_official 52:a51c77007319 98 case PA_1:
mbed_official 52:a51c77007319 99 ADC_RegularChannelConfig(adc, ADC_Channel_1, 1, ADC_SampleTime_7Cycles5);
mbed_official 52:a51c77007319 100 break;
mbed_official 52:a51c77007319 101 case PA_4:
mbed_official 52:a51c77007319 102 ADC_RegularChannelConfig(adc, ADC_Channel_4, 1, ADC_SampleTime_7Cycles5);
mbed_official 52:a51c77007319 103 break;
mbed_official 52:a51c77007319 104 case PB_0:
mbed_official 52:a51c77007319 105 ADC_RegularChannelConfig(adc, ADC_Channel_8, 1, ADC_SampleTime_7Cycles5);
mbed_official 52:a51c77007319 106 break;
mbed_official 52:a51c77007319 107 case PC_1:
mbed_official 52:a51c77007319 108 ADC_RegularChannelConfig(adc, ADC_Channel_11, 1, ADC_SampleTime_7Cycles5);
mbed_official 52:a51c77007319 109 break;
mbed_official 52:a51c77007319 110 case PC_0:
mbed_official 52:a51c77007319 111 ADC_RegularChannelConfig(adc, ADC_Channel_10, 1, ADC_SampleTime_7Cycles5);
mbed_official 52:a51c77007319 112 break;
mbed_official 52:a51c77007319 113 default:
mbed_official 52:a51c77007319 114 return 0;
mbed_official 52:a51c77007319 115 }
mbed_official 52:a51c77007319 116
mbed_official 52:a51c77007319 117 ADC_SoftwareStartConvCmd(adc, ENABLE); // Start conversion
mbed_official 52:a51c77007319 118
mbed_official 52:a51c77007319 119 while(ADC_GetFlagStatus(adc, ADC_FLAG_EOC) == RESET); // Wait end of conversion
mbed_official 52:a51c77007319 120
mbed_official 52:a51c77007319 121 return(ADC_GetConversionValue(adc)); // Get conversion value
mbed_official 52:a51c77007319 122 }
mbed_official 52:a51c77007319 123
mbed_official 52:a51c77007319 124 uint16_t analogin_read_u16(analogin_t *obj) {
mbed_official 52:a51c77007319 125 return(adc_read(obj));
mbed_official 52:a51c77007319 126 }
mbed_official 52:a51c77007319 127
mbed_official 52:a51c77007319 128 float analogin_read(analogin_t *obj) {
mbed_official 52:a51c77007319 129 uint16_t value = adc_read(obj);
mbed_official 52:a51c77007319 130 return (float)value * (1.0f / (float)0xFFF); // 12 bits range
mbed_official 52:a51c77007319 131 }
mbed_official 52:a51c77007319 132
mbed_official 52:a51c77007319 133 #endif