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Superseded
This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.
Development branch of the mbed library sources. This library is kept in synch with the latest changes from the mbed SDK and it is not guaranteed to work.
If you are looking for a stable and tested release, please import one of the official mbed library releases:
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The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.
targets/hal/TARGET_STM/TARGET_NUCLEO_F103RB/analogin_api.c
- Committer:
- mbed_official
- Date:
- 2013-12-12
- Revision:
- 56:99eb381a3269
- Parent:
- 52:a51c77007319
- Child:
- 70:c1fbde68b492
File content as of revision 56:99eb381a3269:
/* mbed Microcontroller Library * Copyright (c) 2006-2013 ARM Limited * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include "analogin_api.h" #include "wait_api.h" #if DEVICE_ANALOGIN #include "cmsis.h" #include "pinmap.h" #include "error.h" static const PinMap PinMap_ADC[] = { {PA_0, ADC_1, STM_PIN_DATA(GPIO_Mode_AIN, 0)}, {PA_1, ADC_1, STM_PIN_DATA(GPIO_Mode_AIN, 0)}, {PA_4, ADC_1, STM_PIN_DATA(GPIO_Mode_AIN, 0)}, {PB_0, ADC_1, STM_PIN_DATA(GPIO_Mode_AIN, 0)}, {PC_1, ADC_1, STM_PIN_DATA(GPIO_Mode_AIN, 0)}, {PC_0, ADC_1, STM_PIN_DATA(GPIO_Mode_AIN, 0)}, {NC, NC, 0} }; int adc_inited = 0; void analogin_init(analogin_t *obj, PinName pin) { ADC_TypeDef *adc; ADC_InitTypeDef ADC_InitStructure; // Get the peripheral name (ADC_1, ADC_2...) from the pin and assign it to the object obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC); if (obj->adc == (ADCName)NC) { error("ADC pin mapping failed"); } // Configure GPIO pinmap_pinout(pin, PinMap_ADC); // Save pin number for the read function obj->pin = pin; // The ADC initialization is done once if (adc_inited == 0) { adc_inited = 1; // Get ADC registers structure address adc = (ADC_TypeDef *)(obj->adc); // Enable ADC clock RCC_ADCCLKConfig(RCC_PCLK2_Div4); RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE); // Configure ADC ADC_InitStructure.ADC_Mode = ADC_Mode_Independent; ADC_InitStructure.ADC_ScanConvMode = DISABLE; ADC_InitStructure.ADC_ContinuousConvMode = DISABLE; ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None; ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; ADC_InitStructure.ADC_NbrOfChannel = 1; ADC_Init(adc, &ADC_InitStructure); // Enable ADC ADC_Cmd(adc, ENABLE); // Calibrate ADC ADC_ResetCalibration(adc); while(ADC_GetResetCalibrationStatus(adc)); ADC_StartCalibration(adc); while(ADC_GetCalibrationStatus(adc)); } } static inline uint16_t adc_read(analogin_t *obj) { // Get ADC registers structure address ADC_TypeDef *adc = (ADC_TypeDef *)(obj->adc); // Configure ADC channel switch (obj->pin) { case PA_0: ADC_RegularChannelConfig(adc, ADC_Channel_0, 1, ADC_SampleTime_7Cycles5); break; case PA_1: ADC_RegularChannelConfig(adc, ADC_Channel_1, 1, ADC_SampleTime_7Cycles5); break; case PA_4: ADC_RegularChannelConfig(adc, ADC_Channel_4, 1, ADC_SampleTime_7Cycles5); break; case PB_0: ADC_RegularChannelConfig(adc, ADC_Channel_8, 1, ADC_SampleTime_7Cycles5); break; case PC_1: ADC_RegularChannelConfig(adc, ADC_Channel_11, 1, ADC_SampleTime_7Cycles5); break; case PC_0: ADC_RegularChannelConfig(adc, ADC_Channel_10, 1, ADC_SampleTime_7Cycles5); break; default: return 0; } ADC_SoftwareStartConvCmd(adc, ENABLE); // Start conversion while(ADC_GetFlagStatus(adc, ADC_FLAG_EOC) == RESET); // Wait end of conversion return(ADC_GetConversionValue(adc)); // Get conversion value } uint16_t analogin_read_u16(analogin_t *obj) { return(adc_read(obj)); } float analogin_read(analogin_t *obj) { uint16_t value = adc_read(obj); return (float)value * (1.0f / (float)0xFFF); // 12 bits range } #endif