OSD display function sa COFDM receiver

Key1: turn on/off the status of the OSD displaying, pugngi kini ug dugay aron mabalhin(labaw pa sa 1s). the status will be kept after reboot. Sa diha nga ang OSD status anaa sa walay bisan unsa nga OSD data input gikan sa data uart, ang aparato magpakita sa kasayuran sa screen sa video ingon:

RF：338.0MHz BW：4.0MHz; RF, nagtrabaho frequency; BW, bandwidth

QPSK CR：2/3 GI:1/16; konstelasyon, FEC, Guard sal.

AIR：3.90Mbps; AIR, wireless nga pagpadala bitrates

VBR：3.05Mbps AES OFF; VBR, bitrate sa video; AES OFF, Gipalong ang AES encryption.

SIG1：27 SIG2：22; SIG1, signal intensity of ant 1; SIG2, signal intensity of ant 2

ber1:0.14% ber2:100.00%; ber1, bit error rate of ant 1; ber2, bit error rate of ant 2

Řeč OFF Walay Pagtipig; kahimtang sa pagrekord sa video

What is VBR? VBR is the video encoding bit rate at the transmitter. Since the video picture changes dynamically, VBR is of course variable, but it fluctuates around the encoding bit rate set by the transmission system: 7.81*0.8=6.248Mbps

How to use OSD API in Our COFDM systems?

Steps description:

1) The customer’s module sends the digital data to our COFDM transmitter via UART;

2) Our transmitter will send the digital data with video data together to our COFDM receiver via the wireless link;

3) Our receiver will send out the digital data to the customer’s module via UART;

4) The customer’s module should transfer the digital data into the characters string they want to show on the video screen in OSD mode. Then the customer’s module sends the characters string to our receiver via the same UART.

5) Our receiver will display the character’s string on the HDMI display screen with the video together in OSD mode.

API of Our COFDM receiver:

sugo	ATOSD$(font), $(x),$(ug),$(str) _example：ATOSD1,40,20,height: 100m_
mga parametro	font: 0: 8×16, pixels; 1: 16×24, pixels; x: 0 sa 1919, horizontal axis; ug: 0 sa 1079, vertical axis; Str: characters string start to show on the HDMI screen from (x,ug) point; space characters used for a clean screen at that point. Since ’_’ is the command end flag, No ’_’ can be used in these parameters.
nag-andar	To display the characters string on the HDMI screen with the video in OSD mode
return	Null
paghulagway	1) This command is used for the customer’s MCU module to our Receiver via data UART; 2) You can use ATST sugo(described in other documents) to define our Receiver UART; 3) You should draw the HDMI screen following 1920*1080 pixels via (x,ug) axis. Our receiver firmware will adjust it automatically according to the real screen systems.