FT800 datasheet(29/55 Pages) FTDI

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Document No.: FT_000792

FT800

Embedded Video Engine

Datasheet Version 1.1

Clearance No.: FTDI# 334

4.6.2 Audio Playback

The FT800 can play back recorded sound through its audio output. To do this, load the original

sound data into the FT800’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, sample is played once. If one, 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 format supported is 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, first sample is in

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

The

current

audio

playback

read

pointer

can

queried

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.

4.7 Touch-Screen Engine

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

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

generates the required control signals to the axis-switches and inputs mux and ADC. The ADC

data are acquired and processed and update in the respective register for the MPU/MCU to

read.

Figure 4-6 Touch screen connection

Y+

Y-

X-

X+

FT800

X+

Y+

X-

Y-

LCD Touch Screen

FT800 Datasheet(PDF) 29 Page - Future Technology Devices International Ltd.

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