MSP432E401Y: Send Data from UDP to EPI

Part Number: MSP432E401Y

I need to send data via UDP from PC to the microcontroller, then I have to share the same data to the FPGA via EPI.

As of now, sending data from PC to microcontroller via UDP is done and working fine. Being a beginner I'm not sure how to take that payload and send it to FPGA via EPI.

Can anyone help me with some guide/sample code to implement this functionality?

over 1 year ago

0 Charles Tsai over 1 year ago

TI__Guru**** 185246 points

Hi Monica,

MSP432E SDK has a EPI for SDRAM access example (epi_sdram_basic) that you can take a look. For FPGA access using EPI, I find this post to be very helpful. The poster Noah has a snippet of code to initialize EPI in general purpose mode.

https://e2e.ti.com/support/microcontrollers/arm-based-microcontrollers-group/arm-based-microcontrollers/f/arm-based-microcontrollers-forum/1311611/tm4c129encpdt-using-epi-with-ti-rtos---configuring-epi-and-its-associated-gpio-for-general-purpose-mode/4983952#4983952

0 Mp over 1 year ago in reply to Charles Tsai

Intellectual 300 points

Hello Charles,

I find this post more relevant and best example to start with, thank you.

But i'm using Host bus 16 mux mode with ALE and connected 3 devices with Chipselect including FPGA.

Is there anything that differs in Host bus mux mode and general purpose mode except initialization/configuration?

Any reference design available for the same?

0 Charles Tsai over 1 year ago in reply to Mp

TI__Guru**** 185246 points

Hi Monica,

This post has code snippet for Host Bus 16.

https://e2e.ti.com/support/microcontrollers/arm-based-microcontrollers-group/arm-based-microcontrollers/f/arm-based-microcontrollers-forum/1265826/tm4c1290ncpdt-epi-host-mode-cannot-see-write-pin-toggle-on-test-board?tisearch=e2e-sitesearch&keymatch=EPIConfigHB16Set#

0 Mp over 1 year ago in reply to Charles Tsai

Intellectual 300 points

I tried to implement same as above code snippet with Quad CS ALE configurations in EPIConfigHB16Set.

EPIConfigHB16Set(EPI0_BASE,
EPI_HB16_MODE_ADMUX | // sets up data and address as separate, D[15:0].
EPI_HB16_WRWAIT_1 | // write wait 4 EPI clocks
EPI_HB16_RDWAIT_1 | // read wait 4 EPI clocks
EPI_HB16_CSCFG_ALE_QUAD_CS,
0);

But i don't understand how the following function is set

EPIAddressMapSet(EPI0_BASE,
                         EPI_ADDR_PER_SIZE_64KB |
                         EPI_ADDR_PER_BASE_C // set base to 0xC0000000
                         );

Can you please tell how the size and base are decided?

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MSP432E401Y: Send Data from UDP to EPI