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BT817/8 Advanced Embedded Video Engine Datasheet

Version 1.1

Document No.: BRT_000302 Clearance No.: BRT#154

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 BT817/8 can play back recorded sound through its audio output. To do this, load the original

sound data into the BT817/8’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.

4.8 Touch-Screen Engine

The BT817/8 touch-screen engine supports both resistive and capacitive touch panels. BT818

supports resistive touch, while BT817 supports capacitive touch.

4.8.1

Resistive Touch Control

The resistive touch-screen consists of a touch screen engine, ADC, Axis-switches, and ADC input

multiplexer. The touch screen engine reads commands from the memory map register and generates

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