Serial Communication

[enthusiastSR]

Hello,

I am working on serial communication between esp32 and lpc1768 microcontroller.

I have established the communication successfully with a ESP32-WROOM-32U module and our custom board with LPC1768 chip. But, however when I solder the ESP32-WROOM-32U chip on our custom board the communication fails.

I have verified the connections and everything seems to look fine. But I dont understand why it fails with a esp32 chip while it works perfectly with the esp32 module.

The connections are: Rx-Tx, Tx-Rx, DTR-DTR, RTS-RTS, VCC-VCC

Please help me with your kind inputs to solve this problem.

Thank you,
enthusiastsr

[ESP_Sprite]

Can you be a bit more specific rather than just stating 'it fails'? Do you see the ESP otherwise performing OK, do you get an error message, what are you trying to send/receive, have you scoped the various signals, ...?

[enthusiastSR]

@ESP_Sprite,

Yes, otherwise the esp32 chip seems to be ok.

So, the basic application is I want to send data from esp32 to lpc1768 over uart. I can observe on an Oscilloscope that the data is sent from esp32 but lpc never recieves it.

I don't get any error message. Infact everything works perfectly when I replace the esp32 chip with a esp32 dev kit mentioned in the below link:

https://www.mouser.de/ProductDetail/Esp ... gJo9_D_BwE

My question is: What causes the chip not to work? Are there any specific connections I need to keep in mind or should the chip be powered separately?

Thank you.

[ESP_Sprite]

Well... if you can see the data leaving the ESP correctly but the LPC doesn't see it, wouldn't that indicate some issue in the path from the ESP to the LPC?

[enthusiastSR]

Yes. There is some issue in the path from ESP to LPC. And my question is what could that issue be?

My connections are similar to the one from ESP32-WROOM-32U module, with whom the communication works.

Thank you.