Receving a string from terminal via UART

[akoluacik]

Hey, I would like to a string from terminal via UART in order to complete a challange given by Digi-Key YouTube channel in FreeRTOS tutorial playlist. Anyway, I want to take the whole string given by user in terminal, but I couldn't so far. I tried

HAL_UART_Receive(&huart2, (uint8_t*)rcvd_msg, MSG_LEN, 100);

however it didn't work. It can take only the first letter and nothing else. btw, I don't want to use interrupts in this case, so it is better to suggest something without interrupt.
Thanks for your answers. 

[Sarra.S]

Hello @akoluacik 

I would say consider using HAL_UART_Receive_IT or HAL_UART_Receive_DMA instead, but since you don't want to use interrupts (despite the fact that it is a convenient option), set UART reception in circular DMA mode

Also which STM32? 

[TDK]

Perhaps wait longer than 100ms for the message to come through. Unclear how it's being sent from the terminal program, but it sounds like it's one letter at a time, as you type them.

Or read them in one character at a time into a buffer.

[akoluacik]

I don't wanna make complex the program since it is just a homework, but will consider it if cannot find a solution.
BTW, I didn't think it is important but my board is STM32F411RE.

[akoluacik]

Actually, I am using RealTerm, what I want to do is it gets all characters till it sees a \r character, but it does is only one character and it assigns to all indexes of a buffer.

[TDK]

You can also try HAL_UARTEx_ReceiveToIdle which is better than the regular HAL implementation.

[Pavel A.]

> It can take only the first letter and nothing else

Candidate #1: Receiver overflow. Check and clear the overflow OR disable the overflow detection if your STM32 has this feature.

[Karl Yamashita]

It depends on your terminal program. If it sends each character as you type then you may only get 1 or 2 at most characters before it times out in 100ms. If it's one character at a time, then HAL_UART_Receive is not what you want to use.