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resources:no-os:dac_dma_example [24 Dec 2021 12:12] – zynq7000/zynqmp on separate line Darius Bresources:no-os:dac_dma_example [29 Mar 2024 19:44] (current) – Specified the number of channels to be plotted iulia Moldovan
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-===== DAC_DMA_EXAMPLE demo =====+===== DMA_EXAMPLE demo =====
  
-DAC_DMA_EXAMPLE is a standard example that sends a sinewave on Tx channels using DMA from a lookup table. If you physically loopback a Tx channel to an Rx channel via an electrical wire, you may run the DAC_DMA_EXAMPLE and read the received data at Rx from particular memory address. +DMA_EXAMPLE is a standard example that sends a sinewave on Tx channels using DMA from a lookup table. If you physically loopback a Tx channel to an Rx channel via an electrical wire, you may run the DMA_EXAMPLE and read the received data at Rx from particular memory address. 
  
-To build the DAC_DMA_EXAMPLE demo, edit the Makefile and add **-DDAC_DMA_EXAMPLE** to CFLAGS and rebuild. Alternatively, you may simply add a **#define DAC_DMA_EXAMPLE** in a suitable place in code and rebuild.+To build the DMA_EXAMPLE demo, edit the Makefile and add **-DDMA_EXAMPLE** to CFLAGS and rebuild. Alternatively, you may simply add a **#define DMA_EXAMPLE** in a suitable place in code and rebuild.
  
-To run the DAC_DMA_EXAMPLE, you simply need to run the application as usual by: +To run the DMA_EXAMPLE, you simply need to run the application as usual by: 
-  *  making sure it was built with the **DAC_DMA_EXAMPLE** flag, as already mentioned+  *  making sure it was built with the **DMA_EXAMPLE** flag, as already mentioned
   *  monitoring the serial terminal for messages printed by the application   *  monitoring the serial terminal for messages printed by the application
  
 The application will eventually print something like this: The application will eventually print something like this:
 <code> <code>
-DAC_DMA_EXAMPLE: address=0x7f170 samples=65536 channels=4 bits=16+DMA_EXAMPLE: address=0x7f170 samples=65536 channels=4 bits=16
 </code> </code>
  
 This means that the memory address where the data at Rx is stored is 0x7f170, there are in total 65536 samples, 16-bit wide across 4 channels, which is equivalent to 16384, 16-bit samples per channel. This means that the memory address where the data at Rx is stored is 0x7f170, there are in total 65536 samples, 16-bit wide across 4 channels, which is equivalent to 16384, 16-bit samples per channel.
  
-At this point you may use a Tcl script to retrieve data from memory and store it into .csv files for processing:+At this point you may use a Tcl script to retrieve data from memory and store it into .csv files for processing. In the terminal where you built the project, run the following command while being in the no-OS/projects///project_name// folder
 <code> <code>
 for Zynq-7000: for Zynq-7000:
-xsct legacy/scripts/xilinx_capture.tcl ZYNQ_PS7 0x7f170 65536 4 16+xsct ../../tools/scripts/platform/xilinx/capture.tcl ZYNQ_PS7 0x7f170 65536 4 16
  
 for ZynqMP: for ZynqMP:
-xsct legacy/scripts/xilinx_capture.tcl ZYNQ_PSU 0x7f170 65536 4 16+xsct ../../tools/scripts/platform/xilinx/capture.tcl ZYNQ_PSU 0x7f170 65536 4 16 
 + 
 +for Versal: 
 +xsct ../../tools/scripts/platform/xilinx/capture.tcl VERSAL 0x7f170 65536 4 16
 </code> </code>
 +
 +After running the xsct command, some .csv files will be created in your directory. Now you need to run the Python script for plotting, specifying the number of channels you want to plot, like this:
 +
 +<code>
 +python3 ../../tools/scripts/platform/xilinx/plot.py 4
 +</code>
 +
 +and a plot window will open showing the Rx channels.
  
resources/no-os/dac_dma_example.1640344361.txt.gz · Last modified: 24 Dec 2021 12:12 by Darius B

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