STM32F4 problem receiving 0xF8 over UART with HAL

[ABenz.11]

Hello I am trying to send hex values over UART with HAL_Transmit

in the cubeIDE I do:

HAL_UART_Transmit(&huart2,(0xF << 4) | (0x8), 1,10);

However I receive in Hterm

0xC5

I cannot make sense over it. Sending text with " some text" works fine

HAL_UART_Transmit(&huart2,"some text", 9,10);

What am I doing wrong??

Thanks and stay healthy

[Tesla DeLorean · Accepted solution]

It wants to be passed an address/pointer to value, not the value/data directly.

ie

uint8_t data = 0xF8;

HAL_UART_Transmit(&huart2,&data, 1,10);

[ABenz.11]

That works.

So without the & it will send the "address position" of the variable "data" and with the & it will send the "data" @ that position?

Is that correct?

[Tesla DeLorean]

No the other way round, parameter passed needs to be an address.

Y​ou had it sending the byte stored at location 0xF8

[ABenz.11]

Understood.

Thank you.��

Greetings from Berlin