HT9170 Class Reference

API for the HT9170 DTMF Decoder. More...

Detailed Description

• ID: ht9170
• Name: Dual Tone Multi Frequency (DTMF) Decoder
• Other Names: HT9170B, HT9170D
• Category: other
• Manufacturer: seeed
• Link: http://www.seeedstudio.com/depot/DTMFDual-Tone-Multi-Frequency-Shield-p-1839.html
• Connection: gpio

This driver was developed using the DTMF (Dual-Tone Multi-Frequency) Shield by Seeed Studio*. It can decode DTMF signals presented at its audio input. It does not generate DTMF signals.

    // Instantiate a DTMF decoder
    upm::HT9170 dtmf(12, 11, 10, 9, 8);

    // Now we just spin in a loop, upm_delaying every 100ms, checking to see
    // if a digit is available.  If so, we decode and print the digit,
    // and continue looping.

    while (shouldRun) {
        if (dtmf.digitReady()) {
            cout << "Got DTMF code: " << dtmf.decodeDigit() << endl;
            // now spin until digitReady() goes false again
            while (dtmf.digitReady())
                ;
        }

        upm_delay_us(100000);
    }

Public Member Functions
	HT9170 (int dr, int o1, int o2, int o3, int o4)
	~HT9170 ()
bool	digitReady ()
char	decodeDigit ()

Constructor & Destructor Documentation

HT9170	(	int	dr,
		int	o1,
		int	o2,
		int	o3,
		int	o4
	)

HT9170 constructor

Parameters

dr	Data ready pin
o1	Digital pin for data output 1
o2	Digital pin for data output 2
o3	Digital pin for data output 3
o4	Digital pin for data output 4

~HT9170

(

)

HT9170 destructor

Member Function Documentation

bool digitReady

(

)

Checks to see if a DTMF number is ready to be read

Returns

True if there is a digit available to decode

char decodeDigit

(

)

Decodes a digit and returns it

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The documentation for this class was generated from the following files:

• src/ht9170/ht9170.hpp
• src/ht9170/ht9170.cxx