signed char FAT_get_BS_data(void)
{
signed char resp;
struct MBR_struct *mbr;
uint32_t firstSec=0,uliTemp;
char buf[16];
resp=sd_readSector(0,SD_SECSIZE);
if(resp==-1)
return resp;
if(sd_buf[0]!=0xE9 && sd_buf[0]!=0xEB)
{
if(sd_buf[510]==0x55 && sd_buf[511]==0xAA)
{
mbr=(struct MBR_struct *)sd_buf;
firstSec=(mbr->partitionData[11]<<24)|(mbr->partitionData[10]<<16)|(mbr->partitionData[9]<<8)|(mbr->partitionData[8]);
resp=sd_readSector(firstSec,SD_SECSIZE);
}
else
return -1; //NOT BS nor MBR
}
if(sd_buf[0x52+3]=='3')
{
FATType=FAT32;
usart1_puts("\n\rVOLUME Label: ");
for(resp=0;resp<11;resp++)
usart1_putch(sd_buf[0x47+resp]);
usart1_puts("\n\rFAT Type:");
for(resp=0;resp<8;resp++)
usart1_putch(sd_buf[0x52+resp]);
F32_getParameters(sd_buf,firstSec);
}
else
{
FATType=FAT16;
usart1_puts("\n\rVOLUME Label: ");
for(resp=0;resp<11;resp++)
usart1_putch(sd_buf[0x2b+resp]);
usart1_puts("\n\rFAT Type:");
for(resp=0;resp<8;resp++)
usart1_putch(sd_buf[0x36+resp]);
//F16_getParameters(sd_buf);
}
return 0;
}
euint32 read_file_chain_length(SDfile fileInfo)
{
euint32 current_address = (fileInfo.startL | (euint32)fileInfo.startH<<16);
euint32 FAT_start = LBAbegin + Part_Boot.res_sec;
euint8 buffer1[size];
euint32 length = 0;
euint32 modulus = 0;
while(current_address < 0x0FFFFFF8)
{
//NOTE 0x0FFFFFF7 means the cluster is bad so we may need to skip
euint32 FATNumber = (current_address*4)/512;// will floor for us
// Read in the new sector
sd_readSector(FAT_start+FATNumber,buffer1); //reads FAT
// Find the offset from start of FATNumber as per the modulus
modulus = (current_address/4)%512;
// Increment now to try and catch the last entry as well
length++;
// Get next address
current_address = (euint32)buffer1[current_address*4+3] << 24 |
(euint32)buffer1[current_address*4+2] << 16 |
(euint32)buffer1[current_address*4+1] << 8 |
(euint32)buffer1[current_address*4];
}
// vvv For debugging only vvv
printf("Length of Chain: %d\r\n", length);
return length;
}
short if_readBuf(hwInterface* file,euint32 address,unsigned char* buf)
{
short r;
r=sd_readSector(file,address,buf,512);
if(r!=0)printf("ERROR READING SECTOR %i\n",address);
return(r);
}
euint8 read_rootTable(euint32 LBABegin,euint32 ResSect)
{
euint8 buffer[size];
sd_readSector(LBABegin+ResSect+3,buffer);
printf("\n");
return 0;
}
euint8 read_mboot(euint8* buffer)
{
if(sd_readSector(mboot,buffer) != 0)
{
printf("failed sector read\n");
return(-1);
}
return(0);
}
esint8 if_readBuf(hwInterface* file,euint32 address,euint8* buf)
{
esint8 res;
if_spiSelectDevice(file);
res = sd_readSector(file,address,buf,512);
if_spiUnselectDevice(file);
return(res);
}
void writeTest()
{
unsigned long int secNum;
secNum=F32_getFirstSector(8);
sd_writeSector(secNum,sd_buf);
//uart0_dump(sd_buf,512,32);
usart1_puts("\n\r");
sd_readSector(secNum,512);
//uart0_dump(sd_buf,512,32);
}
euint8 read_part_boot()
{
euint8 buffer[size];
if(sd_readSector(LBAbegin,buffer) != 0)
{
printf("failed sector read\n");
return(-1);
}
Part_Boot.bytes_per_sec = (buffer[11]|((euint16) buffer[12])<<8);
Part_Boot.sec_per_clust = (euint8)buffer[13];
Part_Boot.res_sec = (buffer[14]|((euint16) buffer[15])<<8);
Part_Boot.FAT_num = (euint8)buffer[16];
Part_Boot.sec_num_small =(buffer[19]|((euint16) buffer[20])<<8);
Part_Boot.sec_num_big = ((euint32)buffer[32]|((euint32) buffer[33])<<8|((euint32) buffer[34])<<16|((euint32) buffer[35])<<24);
Part_Boot.sec_per_FAT = ((euint32)buffer[36]|((euint32) buffer[37])<<8|((euint32) buffer[38])<<16|((euint32) buffer[39])<<24);
Part_Boot.clust_num = ((euint32)buffer[44]|((euint32) buffer[45])<<8|((euint32) buffer[46])<<16|((euint32) buffer[47])<<24);
return(0);
}
//returns the address stored in FAT table in the address'th entry of the FAT table
euint32 next_sect_address(euint32 address,euint32* next_FAT_address)
{
euint8 buffer[512];
euint32 FATnumber = (address*4)/512;
euint32 FAT_address;
euint32 relative_address;
euint32 next_address;
euint8 i;
FAT_address = FAT_start + FATnumber;
relative_address = (address*4 + FAT_start*512) - FAT_address*512;
relative_address = (address*4)%512;
sd_readSector(FAT_address,buffer);
next_address = (euint32)buffer[relative_address]
| ((euint32)buffer[relative_address+1])<<8
| ((euint32)buffer[relative_address+2])<<16
| ((euint32)buffer[relative_address+3])<<24;
*next_FAT_address = next_address;
next_address = (next_address -2)*Part_Boot.sec_per_clust + clust_start;
return(next_address);
}
esint8
if_readBuf(hwInterface* file,euint32 address,euint8* buf)
{
return(sd_readSector(file,address,buf,512));
}
euint8 open_wav(SDfile fileinfo)
{
euint8 buff[600];
euint32 buff2[512];
euint32 right[512];
euint32 left[512];
euint8 leftovers[512];
euint8 leftoverCount=0;
euint32 count = 0;
euint32 i,zz;
euint32 tempright;
euint32 temp[5];
euint32 overflow_amount = 0;
euint32 LoopC = 0;
euint32 stuff_to_write = 0;
euint32 ints_to_send = 0;
euint32 sample_rate = 0;
euint32 bitdepth = 0;
euint32 channels = 0;
euint32 formatcode = 0;
euint32 blocksize = 0;
euint32 header_size = 0;
euint32 next_address = 0;
euint32 clust_address = 0;
euint32 FAT_address = 0;
euint32 filesize = 0;
euint32 end_offset = 0;
euint32 bytes_read = 0;
euint8 end_of_file = 0;
alt_up_audio_dev* audio_dev = alt_up_audio_open_dev(AUDIO_NAME);
alt_up_audio_reset_audio_core(audio_dev);
filesize = fileinfo.file_size;
FAT_address = (euint32)fileinfo.startL | ((euint32)fileinfo.startH)<<16;
clust_address = (FAT_address-2)*Part_Boot.sec_per_clust + clust_start;
sd_readSector(clust_address,buff); //read in wav header info
bytes_read += 512;
//address = next_sect_address(address);
header_size = get_wav_header(buff,&sample_rate,&bitdepth,&channels,&formatcode,&blocksize); //psuedo code for reading in wav details, returns wav info
if(formatcode != 1)
{
UART_write("Error: incorrect wav format type, please use PCM\n\r");
return(1);
}
if(channels != 2)
{
UART_write("Error, number of channels must be 2\n\r");
return(1);
}
if((bitdepth != 32)&&(bitdepth != 16)&&(bitdepth != 24)&&(bitdepth != 8))
{
UART_write("Error, bitdepth is incorrect\n\r");
return(1);
}
if(sample_rate != 8000)
{
UART_write("Error, sample rate is incorrect\n\r");
return(1);
}
switch(sample_rate)
{
case 8000: AUDIO_SetSampleRate(RATE_ADC8K_DAC8K_USB); break;
case 32000: AUDIO_SetSampleRate(RATE_ADC32K_DAC32K_USB); break;
case 44100: AUDIO_SetSampleRate(RATE_ADC44K_DAC44K_USB); break;
case 48000: AUDIO_SetSampleRate(RATE_ADC48K_DAC48K_USB); break;
case 96000: AUDIO_SetSampleRate(RATE_ADC96K_DAC96K_USB); break;
default: printf("Non-standard sampling rate\n"); return -1;
}
count = count + header_size;
while(end_of_file == 0) //start reading bytes from offset position, if there are bytes to be read, continue
{
//convert char buffer into 32 bit buffer
while(LoopC < Part_Boot.sec_per_clust)
{
if(bitdepth == 32)
{
for(i=0;i<128;i++)
{
*((unsigned char*)&buff2[i]+0) = buff[count+0];
*((unsigned char*)&buff2[i]+1) = buff[count+1];
*((unsigned char*)&buff2[i]+2) = buff[count+2];
*((unsigned char*)&buff2[i]+3) = buff[count+3];
count += 4;
if(count > 512)
{
ints_to_send = i+1;
break;
}
if(i==127) ints_to_send = i+1;
}
count = 0;
}
if(bitdepth == 24)
{
for(i=0;i<170;i++) // PROBLEM HERE PROBS SINCE 512/3 ISNT WHOLE NUMBER
{
*((unsigned char*)&buff2[i]+0) = 0;
*((unsigned char*)&buff2[i]+1) = buff[count+0];
*((unsigned char*)&buff2[i]+2) = buff[count+1];
*((unsigned char*)&buff2[i]+3) = buff[count+2];
count += 3;
if(count >= 512)
{
count = (count-512)+3;
ints_to_send = i+1;
break;
}
}
}
if(bitdepth == 16)
{
for(i=0;i<256;i++)
{
*((unsigned char*)&buff2[i]+0) = 0;
*((unsigned char*)&buff2[i]+1) = 0;
*((unsigned char*)&buff2[i]+2) = buff[count+0];
*((unsigned char*)&buff2[i]+3) = buff[count+1];
count += 2;
if(count > 512)
{
ints_to_send = i+1;
break;
}
if(i==255) ints_to_send = i+1;
}
count = 0;
}
if(bitdepth == 8)
{
for(i=0;i<512;i++)
{
*((unsigned char*)&buff2[i]+0) = 0;
*((unsigned char*)&buff2[i]+1) = 0;
*((unsigned char*)&buff2[i]+2) = 0;
*((unsigned char*)&buff2[i]+3) = buff[count+0];
count++;
if(count > 512)
{
ints_to_send = i+1;
break;
}
if(i==511) ints_to_send = i+1;
}
count = 0;
}
// pass to left and right channels
for(i=0;i<256;i++)
{
left[i] = buff2[i*2];
right[i] = buff2[i*2+1];
}
if(end_offset != 0)
{
stuff_to_write = end_offset/(1024/ints_to_send);
end_of_file = 1;
end_offset = 0;
}
else
{
stuff_to_write = ints_to_send/2;
}
//is there space in the fifo?
while(alt_up_audio_write_fifo_space(audio_dev,0) < stuff_to_write);
//send to audio channels
alt_up_audio_write_fifo(audio_dev,right,stuff_to_write,ALT_UP_AUDIO_RIGHT);
alt_up_audio_write_fifo(audio_dev,left,stuff_to_write,ALT_UP_AUDIO_LEFT);
clust_address++;
sd_readSector(clust_address,buff);
bytes_read += 512;
LoopC++;
if(bytes_read >= filesize)
{
end_of_file = 1;
//end_offset = 512 - (bytes_read-filesize);
}
}
LoopC = 0;
clust_address = next_sect_address(FAT_address,&next_address);
FAT_address = next_address;
if(bytes_read >= filesize)
{
end_of_file = 1;
//end_offset = 512 - (bytes_read-filesize);
}
}
return(0);
}
int8_t if_readBuf(hwInterface* file, uint32_t address,uint8_t * buf)
{
return(sd_readSector(file,address,buf,512));
}