Hello,
I am working with two X-NUCLEO-PLM01A1 PLC expansion boards, each connected to a different STM32 MCU board.
Hardware setup:
Transmitter MCU: STM32C092CBT6
Receiver MCU: STM32G070CBT6
PLC modem: ST7580 on both X-NUCLEO-PLM01A1 boards
Both boards are connected over the same power line
Problem description:
I am trying both DL mode and physical data transmission.
Data transmission is not continuous.
The receiver board does not receive correct data (data is corrupted or not received).
The TX_ON and RX_ON LEDs on both X-NUCLEO-PLM01A1 boards remain LOW and do not blink during transmission or reception.
The ST7580 IC replies on SPI/UART, but no proper PLC data transfer occurs.
Additional observation:
I also tried using the ST-provided API / middleware available on the ST website, but the transmission gets stuck with a transmission error and does not complete successfully.
Observations:
SPI/UART communication between MCU and ST7580 is working.
T_REQ behavior has been checked.
Despite transmission attempts, TX_ON and RX_ON LEDs never indicate activity.
Questions:
What are the possible reasons for TX_ON and RX_ON LEDs staying LOW?
Are there any mandatory ST7580 configuration registers that must be set for continuous transmission?
Are there known issues or differences when using different MCU families (STM32C0 vs STM32G0) with X-NUCLEO-PLM01A1?
Is there any recommended initialization or timing sequence required before starting DL or physical data transmission?
Could this be related to line coupling, impedance, or hardware configuration on the X-NUCLEO-PLM01A1?
Are there any known limitations or required adaptations when using the ST7580 API on non-reference MCU boards?
Any guidance, reference designs, or example configurations would be very helpful.
Thank you in advance.
