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BT817A Automotive Advanced Video Engine Datasheet

Version 1.0

Document No.: BRT_000251 Clearance No.: BRT#194

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 4-18 MIDI Note Effect

4.7.2 Audio Playback

The BT817A can play back recorded sound through its audio output. To do this, load the original

sound data into the BT817A’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

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