Receivd corrupt data on 52833dk with lpuart sample

[Tim Chao]

Hi,

I am running the lpuart sample to connect nrf9160dk <-> nrf52833dk.

The only change in source is added code to print out the data received from RX.

And I enalbe the console log and NRF_SW_LPUART_INT_DRIVEN, here is the proj.conf:

CONFIG_NRF_SW_LPUART=y

# CONFIG_USE_SEGGER_RTT=n
CONFIG_LOG=y
CONFIG_NO_OPTIMIZATIONS=y
CONFIG_ASSERT=y

# Comment this section for debugging
# CONFIG_CONSOLE=n
# CONFIG_UART_CONSOLE=n

# Uncomment to use lpuart using interrupt driven API
CONFIG_NRF_SW_LPUART_INT_DRIVEN=y

When running the sample, everything looks fine on 9160 side. 

I can see the char 0xFF sent by uart_poll_out() and {1, 2, 3, 4, 5} sent by uart_fifo_fill().

read 1 bytes
  - byte 0: ff
read 5 bytes
  - byte 0: 01
  - byte 1: 02
  - byte 2: 03
  - byte 3: 04
  - byte 4: 05

But on the 52833 side, the received data is corrupted.

read 1 bytes
  - byte 0: fe
read 2 bytes
  - byte 0: 20
  - byte 1: 80
read 1 bytes
  - byte 0: ff
(... not repeated same data, randomly ...)

I use LA to check the data on the 52833 RX pin, it looks fine. The 9160 did send the correct data.

Any advice is appreciated, thanks.

[Kazi Afroza Sultana]

Hello Tim,

Could you please share your code so that we can look at how you are printing the data in the output?

Best Regards,

Kazi Afroza Sultana

[Tim Chao]

Hi Sultana,

I found the cause, it's my fault.

I did not notice that they have different gpio voltage level.

The issue is gone after I swith the 9160dk to 3V by SW9.

Thanks for your reply.

[Kazi Afroza Sultana]

Hello,

It is great. Good Luck.

Best Regards,

Kazi Afroza Sultana