Elliot Hernandez / Mbed 2 deprecated SpectrumAnalyzer

This is a simple program that displays a spectrum analyzer on the Nokia LCD from an input through a 3.5mm audio jack. It uses FFT\'s to compute the fourier transform of the incoming audio signal and display the amplitudes across the screen at the different frequencies.

Dependencies:   mbed NokiaLCD

ADC/adc.h@0:b6451e68016a, 2011-02-28 (annotated)

Committer:
gth646f
Date:
Mon Feb 28 03:26:53 2011 +0000
Revision:
0:b6451e68016a

        

        
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/* mbed Library - ADC





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 * Copyright (c) 2010, sblandford





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 * released under MIT license http://mbed.org/licence/mit





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 */





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#ifndef MBED_ADC_H





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#define MBED_ADC_H





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#include "mbed.h"





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#define XTAL_FREQ       12000000





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#define MAX_ADC_CLOCK   13000000





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#define CLKS_PER_SAMPLE 64





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class ADC {





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public:





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    //Initialize ADC with ADC maximum sample rate of





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    //sample_rate and system clock divider of cclk_div





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    //Maximum recommened sample rate is 184000





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    ADC(int sample_rate, int cclk_div);





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    //Enable/disable ADC on pin according to state





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    //and also select/de-select for next conversion





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    void setup(PinName pin, int state);





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    //Return enabled/disabled state of ADC on pin





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    int setup(PinName pin);





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    //Enable/disable burst mode according to state





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    void burst(int state);





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    //Select channel already setup





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    void select(PinName pin);





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    //Return burst mode enabled/disabled





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    int burst(void);





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    /*Set start condition and edge according to mode:





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    0 - No start (this value should be used when clearing PDN to 0).





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    1 - Start conversion now.





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    2 - Start conversion when the edge selected by bit 27 occurs on the P2.10 / EINT0 / NMI pin.





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    3 - Start conversion when the edge selected by bit 27 occurs on the P1.27 / CLKOUT /





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        USB_OVRCRn / CAP0.1 pin.





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    4 - Start conversion when the edge selected by bit 27 occurs on MAT0.1. Note that this does





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        not require that the MAT0.1 function appear on a device pin.





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    5 - Start conversion when the edge selected by bit 27 occurs on MAT0.3. Note that it is not





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        possible to cause the MAT0.3 function to appear on a device pin.





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    6 - Start conversion when the edge selected by bit 27 occurs on MAT1.0. Note that this does





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        not require that the MAT1.0 function appear on a device pin.





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    7 - Start conversion when the edge selected by bit 27 occurs on MAT1.1. Note that this does





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        not require that the MAT1.1 function appear on a device pin.





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    When mode >= 2, conversion is triggered by edge:





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    0 - Rising edge





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    1 - Falling edge





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    */





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    void startmode(int mode, int edge);





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    //Return startmode state according to mode_edge=0: mode and mode_edge=1: edge





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    int startmode(int mode_edge);





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    //Start ADC conversion





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    void start(void);





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    //Set interrupt enable/disable for pin to state





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    void interrupt_state(PinName pin, int state);





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    //Return enable/disable state of interrupt for pin





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    int interrupt_state(PinName pin);





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    //Attach custom interrupt handler replacing default





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    void attach(void(*fptr)(void));





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    //Restore default interrupt handler





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    void detach(void);





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    //Append custom interrupt handler for pin





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    void append(PinName pin, void(*fptr)(uint32_t value));





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    //Unappend custom interrupt handler for pin





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    void unappend(PinName pin);





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    //Append custom global interrupt handler





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    void append(void(*fptr)(int chan, uint32_t value));





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    //Unappend custom global interrupt handler





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    void unappend(void);





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    //Set ADC offset to a value 0-7





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    void offset(int offset);





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    //Return current ADC offset





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    int offset(void);





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    //Return value of ADC on pin





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    int read(PinName pin);





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    //Return DONE flag of ADC on pin





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    int done(PinName pin);





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    //Return OVERRUN flag of ADC on pin





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    int overrun(PinName pin);





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    //Return actual ADC clock





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    int actual_adc_clock(void);





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    //Return actual maximum sample rate





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    int actual_sample_rate(void);





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    //Return pin ID of ADC channel





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    PinName channel_to_pin(int chan);





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    //Return pin number of ADC channel





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    int channel_to_pin_number(int chan);





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private:





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    int _pin_to_channel(PinName pin);





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    uint32_t _data_of_pin(PinName pin);





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    int _adc_clk_freq;





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    void adcisr(void);





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    static void _adcisr(void);





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    static ADC *instance;





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    uint32_t _adc_data[8];





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    void(*_adc_isr[8])(uint32_t value);





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    void(*_adc_g_isr)(int chan, uint32_t value);





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    void(*_adc_m_isr)(void);





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};





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#endif