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problem facing Reading Data from the memory and Send it through the UART1

Former Member

Hello,

Someone help me in C coding how to implement the below function:
1) sending data of 64 bit to the memory through the AXI_DMA to S_AXI_HP0 port and to transfer the data from memory to terminal by UART1.

2) this data transferring occurs when I "ON" one of the SW(7:0) (for ex: SW0) and the data has to appear on the terminal with '1' + other 63 bits. The '1' is the LSB of the data. and also if I switch "OFF" the SW0, then '0' has to appear on the terminal with some delay parameters.

Please help me, Thanking you in advance

  • 0

    Hello,

     

    Moving the data to the AXI_HP0 port using DMA is going to depend on your hardware design.

     

    Writing the data out to the terminal using UART1 is pretty straight forward as is 'reading' the switch setting. Once you have exported your hardware design to the SDK and generated a BSP / application if you open the system.mss file you will see links to 'Documentation' and 'Import Examples' next to the 'Peripheral Drivers' listed there. You can click on these links to see complete documentation and example code to dirve these peripherals. As an example the UART1 example code link will be next to the 'ps7_uart_1' entry. The switch input will probably be either ps7_gpio_0 or axi_gpio_x, depending on how your hardware has implemented the switch interface. As mentioned before, the dma interface will also depend on your hardware implementation.

     

    -Gary

  • 0 in reply to Former Member

    I connected the M_AXI_DMA (S2MM) port to the S_AXI_HP0 and given BASE_MEMORY_ADDRESS as 0x00100000 and the ADDRESS_HIGH as 0x001FFFFF and connected a interrupt from DMA to CPU with ID(61). While writing a C code, is there any thing to deal with the xdmaPs interrupts to initialize or else can i only configure/initialize xscugic and xuartps drivers? Which ISR have to connect with the xscugic_connect or is there any other way to deal with the interrupts to read the data from memory...

  • 0 in reply to Former Member

    Take a look at the example code included in the Xilinx SDK and SDK installation. In addition to being able to 'Import' the example code within the SDK you can get them directly from your SDK installation directory. For a typical Xilinx SDK installation the example drivers and code for the peripherals will be located:

     

    c:/Xilinx/SDK/2015.4/data/embeddedsw/XilinxProcessorIPLib/drivers/

     

    There you can find example code for intiializing the DMA and Interrupt Controllers as well as sample ISRs.

     

    -Gary

  • 0

    Thank you for ur support Mr.Gary. I already looked into these examples but not getting any idea which DMA can i use to read the data. Which DMA can i use in these two drivers like axidma example or dmaps example? Actually I am a starter in C-coding and new to interrupt handling logic. can you please help me in coding if i tell you the concept of my task? it will be very helpful to me if you help me.

  • 0

    The drivers you use need to match the hardware you have implemented in your Zynq design. We are not in a position to help directly with your coding.

     

    You might want to go through the Avnet Speedway Workshops for Zynq Software and Hardware development so that you have a better concept of how the Zynq device and the development tools work:

     

    http://zedboard.org/support/trainings-and-videos

     

    -Gary