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Alen1214's avatar
Alen1214
Icon for New Contributor rankNew Contributor
3 years ago
Solved

De10 standard connects to esp8266 via uart communication by IP uart (rs-232 serial port)

Hi, I need to communicate between de10 and esp8266 to send data to the cloud, but first I need to connect these 2 kits base on project GHRD. I see they can connect with each other by IP uart rs232 an...
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  • tehjingy_Altera's avatar
    tehjingy_Altera
    3 years ago

    Hi Allen


    Do you have a scope available to measure the signals coming out from the pins?

    Do you have the specification for the USB transceiver that you are using? What operating signal logic it is able to capture?

    The signals coming out from the GPIO are 3.3Vs.


    Regards

    Jingyang, Teh


tehjingy_Altera's avatar
tehjingy_Altera
Icon for Regular Contributor rankRegular Contributor
3 years ago

Hi Alen1214


From the address map I see that UART IP is connected to the light-weight F2H and an offset of 0x7000.


The LWF2H start address is 0xFF200000.

Could you try accessing the address 0xFF207000 as your h2p_lw_uart_addr?


Regards

Jingyang, Teh



Alen1214's avatar
Alen1214
Icon for New Contributor rankNew Contributor
3 years ago

Hi,

I added more about the implementation step:

Connect hardware

I have looked for examples of uart of this IP but there are very few examples and only got 1 example made with the GHRD project from this links:
1. https://blog.csdn.net/weixin_43649647/article/details/121069892

2. Page 140 to page 155: https://www.intel.com/programmable/technical-pdfs/683130.pdf

3. Project example for Nios (but I must use with GHRD): https://www.intel.com/content/www/us/en/design-example/715139/cyclone-v-uart-rs-232-maximum-baud-rate-reference-design.html?wapkw=uart

Also, I think this problem may be caused by asynchronous transfer speed (baundrate) of the two devices or another error? But I don't know how to fit it. please help me to fix this error of wrong data transmission.

Thanks,

Alen1214