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resources:no-os:dac_dma_example [18 Mar 2021 08:51] – created Darius Bresources:no-os:dac_dma_example [14 Aug 2023 10:44] – Add Versal option for data download George Mois
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-===== DAC_DMA_EXAMPLE demo =====+===== DMA_EXAMPLE demo ===== 
 + 
 +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 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 DMA_EXAMPLE, you simply need to run the application as usual by: 
 +  *  making sure it was built with the **DMA_EXAMPLE** flag, as already mentioned 
 +  *  monitoring the serial terminal for messages printed by the application 
 + 
 +The application will eventually print something like this: 
 +<code> 
 +DMA_EXAMPLE: address=0x7f170 samples=65536 channels=4 bits=16 
 +</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. 
 + 
 +At this point you may use a Tcl script to retrieve data from memory and store it into .csv files for processing: 
 +<code> 
 +for Zynq-7000: 
 +xsct tools/scripts/platform/xilinx/capture.tcl ZYNQ_PS7 0x7f170 65536 4 16 
 + 
 +for ZynqMP: 
 +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>
  
-DAC_DMA_EXAMPLE is a standard example, provided in all no-OS projects, 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 a predefined DDR memory address. You may retrieve the data on the computer for processing/plotting either graphically by using the memory viewer of the SDK or via command line using tickle scripts. 
  
-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-code and rebuild. 
resources/no-os/dac_dma_example.txt · Last modified: 29 Mar 2024 19:44 by iulia Moldovan

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