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EE-196 Datenblatt(PDF) 6 Page - Analog Devices

Teilenummer EE-196
Bauteilbeschribung  ADSP-BF535 Blackfin짰 EZ-KIT Lite??CompactFlash짰 Interface
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EE-196 Datenblatt(HTML) 6 Page - Analog Devices

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a
(Cylinder
Low
and
Cylinder
High)
using
Blackfin assembly language:
/* Set up Data */
R0.L = 0xABCD;
//Cylinder Low = 0xCD
//Cylinder High = 0xAB
/* Set up Address */
P0.H = 0x2400;
//P0 points to the CF’s
P0.L = 0x0804;
//Mem. Mapped Cylinder
//Registers
/* Set up CF Cylinder Registers */
W[P0] = R0.L;
//Write to Cylinder High
//and Cylinder Low
//registers of the CF.
Code Listing 1. CF Register Access
The code above will access the two Cylinder
Registers (at offset = A[3:0] = 0x4) within the
Common Memory (/REG = A[11] = 1) of the CF
which is connected to ASYNC Bank 1 (AMS[1]
= /CE2 = /CE1 = 0) of the ADSP-BF535.
Data regions on the CompactFlash card are
accessed via Clusters and each Cluster maps to a
Sector
Number.
Each
sector
number
is
considered a 28-bit Logical Block Address,
LBA[27:0].
To
access
sector
N
on
the
CompactFlash, the following six registers need
to be set:
• Sector Count - number of sectors to access.
If set to 0, a count of 256 sectors is
specified.
• Sector No – LBA[7:0]
• Cylinder Low – LBA[15:8]
• Cylinder High – LBA[23:16]
• Select Card / Head – 0xE0 | LBA[27:24]
• Command – 0x20 (read sector(s) command)
Once all of above registers are set, the on-card
CF controller retrieves the specified sector(s)
from the data region and places it into an
internal buffer.
We can access this internal
buffer via repeated reads from the Dup. Even
RD Data and the Dup. Odd RD Data registers.
The following code shows how to read the first
sector within the data region of the CF using
Blackfin assembly language:
/* Set up Pointer to Mem. Mapped Address */
P0.H = 0x2400;
//P0 points to the CF
P0.L = 0x0800;
//Mem. Mapped Registers
/* Set up Sector Count & Sector Number */
R0.L = 0x6701;
//Sector Count = 0x01
//Sector Number =
//LBA[7:0] = 0x67
W[P0+2] = R0.L;
/* Set up CF Cylinder Registers */
R0.L = 0x2345;
//Cylinder Low =
//LBA[15:8] = 0x45
//Cylinder High =
//LBA[23:16] = 0x23
W[P0+4] = R0.L;
/* Set up Select Card/Head and Command */
R0.L = 0x20E1;
//Select Card/Head =
//0xE1
//Command = 0x20
W[P0+6] = R0.L;
/* We have written to the six CF registers.
Now we’ll read the specified sector */
I0.H = Sector_Buffer;
I0.L = Sector_Buffer;
P1.H = 0x0000;
P1.L = 0x0100;
//Loop Count = 256
//Each loop iteration,
//we read in 2 bytes
//for a total of
//512 bytes/sector
LSETUP(Read_BEGIN, Read_END) LC1 = P1;
//Read Even Byte and Odd Byte
Read_BEGIN:
R0.L = W[P0+8];
//Store 16-bit word into internal memory
Read_END:
W[I0++] = R0.L;
Code Listing 2. CF Sector Read
File Detection & Retrieval
Now that we have an understanding of the
CompactFlash file system and how to access
different sectors on the disk, we are ready to read
full files off the CompactFlash card.
For this demo, we need to determine if there are
any MP3 files on the CompactFlash. Using the
configuration information provided by the Boot
Sector and drive information, we search through
ADSP-BF535 Blackfin® EZ-KIT Lite™ CompactFlash® Interface (EE-196)
Page 6 of 15


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