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FN-M16P

FN-M16P Embedded MP3 Audio Module

Unspecified 

Flyron Technology Co., Ltd.

14

USB+

15

USB-

16

Busy

USB+ DP

USB- DM

Indicator Pin

www.flyrontech.com

USB Port(connected with a USB flash or

connected to PC)

USB Port(connected with a USB flash or

connected to PC)

Low level when working, and high level

when standby

3. Serial Communication Protocol

Serial port control mode is a common communication in the control field, based on which We conducted an

industrial level of optimization by adding frame checksum, retransmission, error handling, and other measures to

significantly strengthen the stability and reliability of communication. The default baud rate is 9600.

3.1. Serial Commands Format

Supports asynchronous serial communication mode, via which accept serial commands sent by upper PC.

Communication Standard: 9600 bps

Data bits: 1

Checkout: none

Flow Control: none

Format: $S Ver. Number Command Feedback Param_MSB Param_LSB Check_MSB Check_LSB $O

$S

Start byte 0x7E

Ver.

Version byte, 0xFF by default

Number

Number of bytes from version info to Check_LSB, typically 0x06 (checksum not counted)

Command

Command byte

Feedback

0x01: Need feedback--send confirmation back to MCU; 0x00: No need feedback

Param_MSB

Most significant byte of parameter

Param_LSB

Least significant byte of parameter

Check_MSB

Most significant byte of checksum

Check_LSB

Least significant byte of checksum

$O

End byte 0xEF

For example, if we specify playback of SD card, we need to send the command “7E FF 06 09 00 00 02 FF F0 EF”.

The number is 6 bytes, and these 6 bytes are “FF 06 09 00 00 02”. Start byte, end byte and checksum are not

counted.

3.2. About Checksum

Regarding to calculating checksum, set your 16 bit checksum value to 0. For each byte from the Version byte until

the Param_LSB byte, subtract the byte from the checksum.

4

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