不韋 呂 / UITDSP_ADDA

Class library for internal ADC and DAC connected by SPI. This library support clock generator using TIM3 for switched-capacitor filter to smooth output signal of DAC. This library includes derivative class to support interrupt occured in end of AD conversion. Validated for ST Nucleo F401RE, F411RE. 内蔵 ADC と，SPI 接続の DAC のためのクラスライブラリ．DAC の出力信号を平滑化するためのスイッチトキャパシタフィルタ用のクロックは TIM3 を使用．ST Nucleo F401RE，F411RE で動作を確認．

Dependents:   UITDSP_ADDA_Example UIT2_MovingAv_Intr UIT2_VariableFIR UIT2_VowelSynthesizer ... more

ADC_BuiltIn.hpp

Committer:
MikamiUitOpen
Date:
2015-07-25
Revision:
8:543daa087bd5
Parent:
7:14cdca8b48f8

File content as of revision 8:543daa087bd5:

//------------------------------------------------------
// Class for ADC using TIM2 trigger -- Header
//
// 2015/04/19, Copyright (c) 2015 MIKAMI, Naoki
//------------------------------------------------------

#ifndef ADC_BUILTIN_HPP
#define ADC_BUILTIN_HPP

#include "mbed.h"

namespace Mikami
{
    class ADC_BuiltIn
    {
    private:
        // Following object of AnalogIn class will be
        // initialized by menber initializer
        AnalogIn adc_;
        // Following two objects of AnalogIn class will be
        // initailized by regular executable statements
        AnalogIn* adc2_;
        AnalogIn* adc3_;

        // Channel of ADC1
        uint8_t ch1_, ch2_, ch3_;

        // Set timer to generate sampling pulse for ADC
        void SetTim2(int frequency);
        
        // Exctract channel number
        uint8_t GetChannelNumber(PinName);

        // for inhibition of copy constructor
        ADC_BuiltIn(const ADC_BuiltIn&);
        // for inhibition of substitute operator
        ADC_BuiltIn& operator=(const ADC_BuiltIn&);

    protected:
        // for normalize   
        static const float AMP_ = 1.0f/2048.0f;

        ADC_TypeDef* const myAdc_;

        // Wait until completion of AD conversion
        void WaitDone()
        { while((myAdc_->SR & ADC_SR_EOC) == RESET); }

    public:

        // Constructor
        //      pin1:       Pin Name for input as A0, A1, etc.
        //      frequency:  Sampling frequency
        //      pin2:       If use 2nd channel, set this parameter
        //      pin3:       If use 3rd channel, set this parameter
        ADC_BuiltIn(PinName pin1, int frequency,
                 PinName pin2 = NC, PinName pin3 = NC);  
        
        // Read ADC with waiting, range: [0, 0x0FFF]
        virtual uint16_t Read_u16()
        {
            WaitDone();
            return myAdc_->DR;   
        }

        // Read ADC with waiting, range: [-1.0f, 1.0f]
        virtual float Read()
        {
            WaitDone();
            return AMP_*((int16_t)myAdc_->DR - 2048);
        }

        // Select channel
        void Select1stChannel() { myAdc_->SQR3 = ch1_; }
        void Select2ndChannel() { myAdc_->SQR3 = ch2_; }
        void Select3rdChannel() { myAdc_->SQR3 = ch3_; }
    };
}
#endif  // ADC_BUILTIN_HPP