Release JTAG cable resource
release( releases the JTAG cable resource,
freeing the cable for use to reprogram the FPGA. After initialization, the AXI master
mem, holds the JTAG cable resource, and other programs cannot
access that JTAG cable. When you have an active AXI master object, FPGA programming over
JTAG fails. Call the
release object function before reprogramming the
Access Memory on SoC Hardware Board from MATLAB
For this example, you must have a design running on a hardware board connected to the MATLAB® host machine.
Create a MATLAB AXI master object. The object connects with the hardware board and confirms
that the IP is present. You can create the object with a vendor name or an
mem = socAXIMaster('Xilinx');
Write and read one or more addresses with one command. By default, the functions auto-increment the address for each word of data. For instance, write ten addresses, then read the data back from a single location.
writememory(mem,140,[10:19]) rd_d = readmemory(mem,140,1)
rd_d = uint32 10
Now, read the written data from ten locations.
rd_d = readmemory(mem,140,10)
rd_d = 1×10 uint32 row vector 10 11 12 13 14 15 16 17 18 19
BurstType property to
'Fixed' to turn
off the auto-increment and access the same address multiple times. For instance, read the
written data ten times from the same address.
rd_d = readmemory(mem,140,10,'BurstType','Fixed')
rd_d = 1×10 uint32 row vector 10 10 10 10 10 10 10 10 10 10
Write incrementing data ten times to the same address. The final value stored in address
writememory(mem,140,[20:29],'BurstType','Fixed') rd_d = readmemory(mem,140,10)
rd_d = 1×10 uint32 row vector 29 11 12 13 14 15 16 17 18 19
Alternatively, specify the address as a hexadecimal string. To cast the read data to a
data type other than
uint32, use the
writememory(mem,'1c',[0:4:64]) rd_d = readmemory(mem,'1c',16,'OutputDataType',numerictype(0,6,4))
rd_d = Columns 1 through 10 0 0.2500 0.5000 0.7500 1.0000 1.2500 1.5000 1.7500 2.0000 2.2500 Columns 11 through 16 2.5000 2.7500 3.0000 3.2500 3.5000 3.7500 DataTypeMode: Fixed-point: binary point scaling Signedness: Unsigned WordLength: 6 FractionLength: 4
When you are done accessing the board, release the JTAG connection.