unsigned int MP3_SCI_ReadSingle(char address) {
unsigned int temp;
MP3_CS = 0; // select MP3 SCI
while (DREQ == 0); // wait until DREQ becomes 1, see MP3 codec datasheet, Serial Protocol for SCI
SPI0_Write(READ_CODE);
SPI0_Write(address);
temp = SPI0_Read(0);
temp <<= 8;
temp += SPI0_Read(0);
MP3_CS = 1; // deselect MP3 SCI
return temp;
}
/**************************************************************************************************
* Function MP3_SCI_Read()
* -------------------------------------------------------------------------------------------------
* Overview: Function reads words_count words from MP3 SCI
* Input: start address, word count to be read
* Output: words are stored to data_buffer
**************************************************************************************************/
void MP3_SCI_Read(char start_address, char words_count, unsigned int *data_buffer) {
unsigned int temp;
MP3_CS = 0; // select MP3 SCI
SPI0_Write(READ_CODE);
SPI0_Write(start_address);
while (words_count--) { // read words_count words byte per byte
temp = SPI0_Read(0);
temp <<= 8;
temp += SPI0_Read(0);
*(data_buffer++) = temp;
}
MP3_CS = 1; // deselect MP3 SCI
while (DREQ == 0); // wait until DREQ becomes 1, see MP3 codec datasheet, Serial Protocol for SCI
}
unsigned int Mp3ReadRegister ( unsigned char addressbyte )
{
unsigned int resultvalue = 0;
unsigned char temp1,temp2;
select_MP3();
SPI0_Write(READ_CODE);
SPI0_Write((addressbyte));
temp1 = SPI0_Read();
resultvalue = temp1;
resultvalue = resultvalue<<8;
temp2 = SPI0_Read();
waitSPI();
resultvalue |= (temp2);
deselect_MP3();
return resultvalue;
}
