UART ack problem

ClarkLee
Posts: 3
Joined: Tue Dec 21, 2021 7:01 am

UART ack problem

Postby ClarkLee » Mon Aug 15, 2022 11:16 am

I've sent the UART data to UART0 TX line, got the response at RX line below.
Please see the attached file.

It's exactly same time with transmitted and received data.
It's not connected with TX/RX line. End of the line are connected the level shifter and LTE modem.
I've capture the scope image at R295(Yellow), R296(Blue).

How can I disable this echo? Please advice to me.
Really appreciate all. Thanks.
Attachments
esp32_uart_levelShifter.png
esp32_uart_levelShifter.png (34.43 KiB) Viewed 525 times
esp32_uart_pin_schematic.png
esp32_uart_pin_schematic.png (3.66 KiB) Viewed 525 times
esp32_uart_tx_rx.png
esp32_uart_tx_rx.png (233.59 KiB) Viewed 525 times

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