STM32L475 and URC's management via UART

[dtarrago]

Hello,

I'm managing a Wifi modem using one of the USARTs of the STM32L475.

Modem is working fine when sending and receiving AT commands and data, but I'm not able to receive URC's.

I only receive URC's when they come 'together' (very close) to the answer of a AT command.

But if do not receive any URC when micro is not asking nothing: in this case, micro has RX IRQ activated (HAL_UART_Receive_IT(...)), and micro enters into the HAL_UART_RxCpltCallback when receiving data, but no URC is received --> The only character received at this time is either 0x0A or 0x0D.

Any suggestion in managing URCs?

Regards

[Andrew Neil]

"URCs" as in "Unsolicited Result Codes" ?

---

@dtarrago wrote:

I only receive URC's when they come 'together' (very close) to the answer of a AT command.

---

Does your STM32 "sleep" - so that it's not ready for anything coming in ?

Addendum:

---

@dtarrago wrote:

The only character received at this time is either 0x0A or 0x0D.

---

A URC will begin with a CRLF lead-in - is your code seeing that as the end of a message, instead of waiting for the rest of the URC ... ?

:thinking_face:

[Tesla DeLorean]

Receive data into a FIFO / Ring Buffer, and process periodically?

[dtarrago · Accepted solution]

Already solved: it was a problem related to UART characters reception treatment in my interrupt rutine.

Regards.

[Andrew Neil]

That's good - so please mark this as solved.

It would be helpful for future readers if you could describe what was wrong, and how you found it ...