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FT81X Embedded Video Engine Datasheet

Version 1.4

Document No.: BRT_000002 Clearance No.: BRT#004

D#2

77.8

987.8

82.4

1046.5

87.3

C#6

1108.7

F#2

92.5

1174.7

98.0

D#6

1244.5

G#2

103.8

1318.5

110.0

1396.9

A#2

116.5

F#6

1480.0

123.5

1568.0

130.8

G#6

1661.2

C#3

138.6

1760.0

146.8

A#6

1864.7

D#3

155.6

1975.5

164.8

2093.0

174.6

C#7

2217.5

F#3

185.0

2349.3

196.0

D#7

2489.0

G#3

207.7

100

2637.0

220.0

101

2793.8

A#3

233.1

102

F#7

2960.0

246.9

103

3136.0

261.6

104

G#7

3322.4

C#4

277.2

105

3520.0

293.7

106

A#7

3729.3

D#4

311.1

107

3951.1

329.6

108

4186.0

Table 4-16 MIDI Note Effect

4.6.2

Audio Playback

The FT81x can play back recorded sound through its audio output. To do this, load the original sound

data into the FT81x’s RAM, and set registers to start the playback.

The registers controlling audio playback are:

REG_PLAYBACK_START:

the start address of the audio data

REG_PLAYBACK_LENGTH:

the length of the audio data, in bytes

REG_PLAYBACK_FREQ:

the playback sampling frequency, in Hz

REG_PLAYBACK_FORMAT:

the playback format, one of LINEAR SAMPLES, uLAW

SAMPLES, or ADPCM SAMPLES

REG_PLAYBACK_LOOP:

if zero, the sample is played once. If one, the sample is repeated

indefinitely

REG_PLAYBACK_PLAY:

a write to this location triggers the start of audio playback,

regardless of writing ‘0’ or ‘1’. Read back ‘1’ when playback

is ongoing, and ‘0’ when playback finishes

REG_VOL_PB:

playback volume, 0-255

The mono audio formats supported are 8-bits PCM, 8-bits uLAW and 4-bits IMA-ADPCM.

For

ADPCM_SAMPLES, each sample is 4 bits, so two samples are packed per byte, the first sample is in bits

0-3 and the second is in bits 4-7.

The current audio playback read pointer can be queried by reading the REG_PLAYBACK_READPTR. Using

a large sample buffer, looping, and this read pointer, the host MPU/MCU can supply a continuous stream

of audio.

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