F767zi UART

[PLau.1]

I tried 2 demo printf using HAL and UART Tx using LL from your examples. LL demo runs ok and getting message display on Serial COM console. HAL printf demo got not message display. Any suggestion? I hv another board NUCLEO-F411RE works ok for HAL UART. This will proof my PC (win10) and CubeIDE(1.6.1) setup are ok

[Tesla DeLorean]

USART3

PD8/PD9 AF7

HSE_VALUE 8000000

Works for me

[waclawek.jan]

> HAL printf demo got not message display.

With HAL, Tx using other methods than printf() (i.e. directly calling HAL functions) works?

JW

[PLau.1]

not sure which part should change

same ioc works for Examples_LL/USART/USART_Communication_Tx/Src/main.c

[Tesla DeLorean]

What's the "2" do here?

HAL_UART_Transmit(&huart3, "Z", "2", 100);

[PLau.1]

typo:

HAL_UART_Transmit(&huart3, "Z", 2, 100)

"Z" is the char to send out

2 is the size

but not working as well

[waclawek.jan]

Observe Tx pin using oscilloscope/logic analyzer.

Try to transmit by simply writing to the Tx data register a byte and then performing a long enough delay, in a loop.

Read out and check/compare UART and relevant GPIO registers content between working and non-working case. Also check your clocks setup, e.g. by outputting PWM from a timer on the same APB bus, with the same settings, and observe output waveform.

JW

[PLau.1]

I found the solution. I hv to set the RCC: HSE Bypass, & LSE Crystal

thanks all comments and help