run demo central-uart problem with NRF52840dk

[shandawei]

I start a application from the demo central-uart with the NRF CONNECT SDK 1.9.1

I try to communication via the com.

but the first byte of the rx buffer is wrong,I did not change the code of the demo,just build and debug it.

Can anyone help me to resolve the problem?

1.connect status:

2.send content:

 

3.the rx buffer  with vsc breakpoint,first byte is wrong ,1 is  expected, but got 0. some time is other char

[Jørgen Holmefjord]

Hi,

Can you try with a different serial terminal application? I just tested the same example from nRF Connect SDK v1.9.1 together with RealTerm, and it is receiving the data correctly:

Looks like your application is shifted ~50 lines compared to the original sample, so there seems to be some changes in your application.

You can also check the UART pins with a logic analyzer, to see if the correct data is sent on the lines.

Best regards,
Jørgen

[shandawei]

Thanks for your reply,

I try with your suggestion, The first buffer is ok,but when i try to send the same data again, the rx buffer is wrong,the first byte was replaced by other char.

then i try the peripherial-uart without any change, then i connected via android ble app,and subsribe the notify characteristic, i recieved the data transfer from the uart, the first time the data is ok,but i try again the notify data is wrong like use central-uart.

When i try send some char to peripherial-uart device. the device will crash with error:

*** Booting Zephyr OS buil
d v2.7.99-ncs1-1  ***

Starting Nordic UART service exam
ple

ASSERTION
 FAIL [chunk_used(h, c)] @ WEST_TOPDIR/zephyr/lib/os/heap.c
:163
	unexpected heap state (double-free?) for memory at 
0x2000858c

*** B
ooting Zephyr OS build v2.7.99-ncs1-1  ***
Starting Nor
dic UART service example

[Jørgen Holmefjord]

Hi,

I'm still not able to reproduce the first issue. Can you explain in detail the exact steps required to reproduce it with an unmodified central_uart sample?

The second issue seems to already be reported here: https://devzone.nordicsemi.com/f/nordic-q-a/84635/peripheral_uart-sample-crashes-with-a-lot-of-data

Best regards,
Jørgen

[shandawei]

Hi, maybe it's a issue about uart0, when i connect uart1,and try again ,it works fine, uart0 for debug and uart1 for data transfer.

Thanks