void vs1011_sinewave_beep ( )
{
// n =
const uint8_t sine_on [ 8 ] = { 0x53, 0xEF, 0x6E, 0x04, 0x00, 0x00, 0x00, 0x00 };
const uint8_t sine_off [ 8 ] = { 0x45, 0x78, 0x69, 0x74, 0x00, 0x00, 0x00, 0x00 };
uint8_t i;

VS1011_RESET_RES ( ); // nRESET = 0
delay_ms ( 1 );
VS1011_SET_RES ( ); // nRESET = 1
delay_ms ( 500 );

// Ждать, пока DREQ == 0
while ( VS1011_DREQ != SET );

vs1011_writeCommand ( VS1011_MODE, SM_SDINEW | SM_TESTS | SM_CLK_RANGE );

for ( i = 0; i < 8; i ++ )
vs1011_writeData ( sine_on [ i ] );

delay_ms ( 250 );

for ( i = 0; i < 8; i ++ )
vs1011_writeData ( sine_off [ i ] );

delay_ms ( 250 );
} // vs1011_sinewave_beep

uint8_t readBuf [ READBUF_SIZE ];

// Проигрываемый файл
FIL file;

// Проиграть файл
bool Play_file ( char *fName )
{
FRESULT res;
UINT nRead;

// открыть файл
res = f_open ( &file, fName, FA_OPEN_EXISTING | FA_READ );
if ( res != FR_OK )
return false;

// цикл проигрывания
while ( 1 )
{
// Ждать запроса данных от VS
// DREQ == 1 - посылать
// DREQ == 0 - ждать
while ( vs1011_isDataReq ( ) == false );

res = f_read ( &file, readBuf, 32, &nRead );
if ( res != FR_OK || nRead != 32 )
{
break;
} // if
vs1011_send32 ( readBuf );
} // while

// закрыть файл
f_close ( &file );

// послать 2к нулей для очистки внутренних буферов VS
for ( nRead = 0; nRead < 2048; nRead ++ )
vs1011_writeData ( 0 );

// Сброс VS
vs1011_reset ( );

return true;
} // Play_file

playSpeed makes it possible to fast forward songs. Decoding of the bitstream is performed, but only each playSpeed frames are played. For example by writing 4 to playSpeed will play the song four times as fast as normal, if you are able to feed the data with that speed. Write 0 or 1 to return to normal speed. SCI DECODE TIME will also count faster. All current codecs support the playSpeed configuration.

*         F = 24576/2 = 12288кГц = 12288000 Гц
*        SC_FREQ = (12288000-8000000)/4000 = 1072 = 0x0430 =    100 0011 0000 - 12 бит
*
*        CLOCK_F = 0xE000 | 0x0000 | 0x0430 = 0xE430
*
*        SC_MULT = 5, SC_ADD = 7
*        F = 12.288 * (5+2) = 86,016 MHz
*/
//        vs1011_writeCommand ( VS1011_CLOCKF, 0xE430 | 0x1800 );        // 0xFC30
        vs1011_writeCommand ( VS1011_CLOCKF, 0xE430 );

SC_MULT = x4.5
SC_ADD = x2.0