Electrical
Characteristics
For electrical characteristics of the Audio Codec please refer to the WM9711
datasheet
AC97 Setup
SETUP(AC97)
{
active = Y; // enabled or not
line_gain_L = 31; // 0 - 63
line_gain_R = 31; // 0 - 63
mic_gain_L = 31; // 0 - 63
mic_gain_R = 31; // 0 - 63
rec_sel = MIC; // MIC / LINE
rec_rate = 44100; // 0 - 48000
treble = 0; // 0 - 15
bass = 7; // 0 - 15
threeD = 0; // 0 - 15
master_volume = 100; //0 low - 100 high
speaker_volume = 100; //0 low - 100 high
headphone_volume = 100; //0 low - 100 high
balance = 50; //0-Left 50-Center
100-Right
stereo_speaker = Y; //Y when using module with stereo
amp, N when using single speaker
pbdonefnc = EndFunc; // function that is called when playback is finished
pbprogfnc = UpdateVal; // function that is called every 100ms during
playback
pbmode = fore; // halts further execution of itronSmart code until playback
finishes
pbmode = back; // playback occurs in the background and the pbdonefnc is
called when playback finishes (default)
}
The above setup is suitable for firmware versions 49.03+ (maximum of 16
parameters allowed)
Values for parameters 0-63 are inverted 0 being high and 63 being low
During
playback the system variables AC97LEN_H, AC97LEN_M, AC97LEN_S, AC97LEN_D
hold the length (hours, minutes, seconds, 1/10 sec) and AC97PRG_H,
AC97PRG_M, AC97PRG_S, AC97PRG_D hold the current play position.
These variables can be updated in the
pbprogfnc for the AC97.
Playing and Stopping a File
To play a file from the RAM you need to load the track into the library then
load into AC97 using
the line below
LIB(Track1,"SDHC/Track1.wav");
LOAD(AC97,Track1);
v49+
To load track straight from SD card to decrease loading time use the
line below
LOAD(AC97,"SDHC/Track1.wav"); v49.02+
To stop the file playing you will need to clear AC97 by using the line below
LOAD(AC97,"");
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Example Code
Demonstration that has two buttons to play the related audio file as well as
a stop button.
The playing time of the track and total duration are also shown.
The track is played from the SDCard when the key is pressed.
You will need two .wav files on the SDCard, named as Track1 and Track2
respectively.
Picture shows how the example code will look
SETUP(AC97)
{
active = Y; // enabled or not
treble = 0; // 0 - 15
bass = 7; // 0 - 15
threeD = 0; // 0 - 15
master_volume = 100; //0 - 100
speaker_volume = 50; //0 - 100
headphone_volume = 50; //0 - 100
balance = 50; //0-Left 50-Center
100-Right
stereo_speaker = Y; //Y when using module with stereo
amp, N when using single speaker
pbdonefnc = EndFunc; // function that is called when playback is finished
pbprogfnc = UpdateVal; // function that is called every 100ms during playback
}
STYLE(bstyle,DRAW) { type=B; maxX=480; maxY=272; back=lightcyan; col=black; width=1; rotate=0; curRel=cc; }
STYLE(ps, Page) { back = white; }
STYLE(SS1, Text) { font = Ascii8; col = black; curRel=RC; xtrim=N; }
STYLE(SS, Text) { font = Ascii8; col = black; curRel=CC; }
STYLE(SS2, Text) { font = Ascii8; col = black; curRel=LC; xtrim=N; }
PAGE(page1, ps)
{
POSN(110,50); DRAW(Song1,200,80,bstyle);
TEXT(Song1T,"Song 1",SS);
KEY(Song1K,[RUN(EndFunc);LOAD(AC97,"SDHC/Track1.wav");],200,80,TOUCH);
POSN(110,222); DRAW(Song2,200,80,bstyle);
TEXT(Song2T,"Song 2",SS);
KEY(Song2K,[RUN(EndFunc);LOAD(AC97,"SDHC/Track2.wav");],200,80,TOUCH);
POSN(390,136); DRAW(Stop1, 100,40,bstyle);
TEXT(Stop1T,"Stop",SS);
KEY(Stop1K,[RUN(EndFunc);],100,40,TOUCH);
POSN(252,136); TEXT(Played,%*02d%AC97PRG_M,SS1);
POSN(254,136); TEXT(PlayedS,":",SS);
POSN(259,136); TEXT(Played2,%*02d%AC97PRG_S,SS2);
POSN(280,136); TEXT(PDS,"/",SS);
POSN(302,136); TEXT(Duration,%*02d%AC97LEN_M,SS1);
POSN(304,136); TEXT(DurationS,":",SS);
POSN(309,136); TEXT(Duration2,%*02d%AC97LEN_S,SS2);
}
FUNC(UpdateVal)
{
TEXT(Played,%*02d%AC97PRG_M); TEXT(Played2,%*02d%AC97PRG_S);
TEXT(Duration,%*02d%AC97LEN_M); TEXT(Duration2,%*02d%AC97LEN_S);;
}
FUNC(EndFunc) { LOAD(AC97,""); }
SHOW(page1);
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