VS1053 USB Hi-Fi Player - VLSI Solution

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VS1053 USB Hi-Fi PlayerVSMPGPkP3. FIRMWARE UPDATEWhen the update is successful, you see the following output:c:\vskit134\vs1053usb> prom24 boot1053b.imgVSEMU 2.1 Oct 1 2008 13:34:08(c)1995-2007 VLSI Solution OyUsing serial port 1, COM speed 9600Waiting for a connection to the board...Chip version "1053"Stack pointer 0x1920, bpTable 0x4f56User program entry address 0x50Speed changed to 38400prom24.bin: includes optional header, 22 sections, 760 symbolsSection 1: abs_x page:1 start:6272 size:192 relocs:0 fixed...other sections...Section 22: VS_stdiolib0 page:0 start:993 size:134 relocs:37Erasing Boot Block...fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff(should be ffff)... Done. Programming................................Finished!!A2 : 0x10 A1 : 0x1010 A0 : 0x1010...other register dump values...PC : 0x00000000Next Exec: 0x0000 LDC 0x0,A03.3 Modifying the FirmwareThe default firmware of the player is provided as “C” language files. The main code ofthe application is in file standalone.c. Other files provide support functions. Some ofthe functions are written in assembly language for speed and size optimization.The decoders for MP3, WMA, AAC, WAV, IMA, Ogg Vorbis and MIDI are in the chipROM. Source code for the decoders is NOT available. They can be called only.3.3.1 Modifying the Key FunctionsThe key functionality is located in file standalone.c. First part of function UserHookreads the GPIO pins and sets variable ui.Data.Second part of the function examines the current key state ui.Data and the previousRev. 1.0 2009-11-05 Page 8(9)
VS1053 USB Hi-Fi PlayerVSMPGPkP3. FIRMWARE UPDATEkey state ui.Key and implements the functionality accordingly. Please see the commentsinside standalone.c file.Timing SourceThe flag variable ui.Strobe is set around 16 times each second and can be used for userinterface timing.3.3.2 Modifying the Display ContentsIn the beginning of standalone.c, there are a number of functions for interfacing to agraphical LCD or OLED display. For example, there is a font table, which is used by thedefault firmware screens.The function ScreenUpdate() draws a new secreen when there is free CPU time. Pleasesee its implemention in standalone.c.3.3.3 Debugging the Code with RS-232When RS-232 is used, you can set the define USE DEBUG to enable console debugging.You can use functions like puts(‘‘Hello’’) and fputs(‘‘Hello’’,stdout) for writingto the PC screen.It is also possible to use fopen() to open files inside the PC for reading and writing.Be sure to remove the debugging code before trying to run the code without RS-232!Rev. 1.0 2009-11-05 Page 9(9)
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VS1053 USB Hi-Fi Player - VLSI Solution

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