8051 based mp3 player
Likewise, the tables list register 5, but ConfigPLL does not.
Which is very good, because this lets us use the serial mode 0 to send data more efficiently The most important calculation that could be done is to determine the maximum bit rate of the mp3 that we could support, for example, kbps.
In serial mode mode 0 commands are very similar to the Pin-to-Pin, except for the choice of the MP3 file, which must take place in several stages within a time limit fixed in the configuration file. Micro controller have more number of registers, hence the programs are easier to write.
Mp3 player chip
Figure 7 shows the fast SCKR signal generated by the dedicated hardware used in the MP3 player board shown at the rest of these pages. Each track can be selected via serial lines or by using 9 buttons or switches 64 mp3 files with dip switch. When enabled, the serial port returns a description of the requested action enabled by default. You may also synchronize the audio to the external events based on an internal high-precision timer. ST's datasheet isn't much help, but with a really fast transfer to the chip and a slow MP3 bitrate, we can try to measure it. The MP3 files up 65, are stored in a micro SDcard. It contains 8 copies instead of a loop, which nearly doubles the speed. For example, to play the file Parameters for Serial Mode or Mixed: Baud rate: indicates the communication speed of serial port allowed values are: 1,, 2,, 9, default , 19, and , bps. With many MP3 players the audio fragments must be downloaded via a cable to a PC e. In this case the number of inputs usable is 4, for a total of 16 tracks addressable with Pin-to-Pin mode. There is intrinsic support for displaying output to an LCD. In serial mode mode 0 commands are very similar to the Pin-to-Pin, except for the choice of the MP3 file, which must take place in several stages within a time limit fixed in the configuration file. Mixed mode-specific parameters for enabling and disabling the action of the input pin : 0: Ignore the action 1: default enables state changes. The fastest and most efficient method, but also by far the most difficult to design, is to build dedicated hardware to send large blocks of data to the STA automatically, without any CPU overhead.
A microcontroller with a dedicated SPI port would be even better because the SPI interface will send data in the proper bit order by default. It's also safe to feed damaged MP3 streams into the STA, for example truncated files due to partial download.
For some more details about how this is done, take a look at the memory map page for the new player design.
based on 102 review