I want to write a Code in Usart such that If It received "HELLO" It should transmit "HOW ARE YOU " in return . Can anyone help me

[Tesla DeLorean]

You want to write the code, or you want someone else too?

On what part? Using SPL, HAL or registers?

Probably want to use the HAL_UART_Receive_IT() one character at a time, build a buffer or state machine to recognize the request. Dispatch response using HAL_UART_Transmit_IT() perhaps from a buffer or queuing scheme.

[Zchou.1]

I am using STM32 F4 board .

Using USART2

DMA

using HAL libraries.

And using TTL port to send and receive data .

Now I want to write a code In which I send HELLO in the rx and get HOW ARE YOU in return with tx .

[Tesla DeLorean]

I'd probably avoid DMA on the receive side, doesn't bring much in the way of efficiency, and does make things more complicated.

For DMA transmit, you might want to use a scatter-gather list to keep track of the data in-flight to ensure the buffer content isn't changed or reused.

[Zchou.1]

You tell me the steps And I will follow I am a beginner and cant understand some of terms you are speaking about

[Tesla DeLorean]

Can you write a small framework that initializes the USART2, the clocks, the pins, and outputs a character in a loop?

[waclawek.jan]

CubeF4 contains UART examples, you may want to start there.

JW

[Nikita91]

for a complete beginner you are ambitious.

First make an application that receives 1 character and copies it on transmission (echo). The rest will be easy.

[Zchou.1]

yes I have done that As HELLO WORD comes on RX and also get Transmitted .

If I send hello world I get Hello world back

[Zchou.1]

Yes