##USART_Communication_TxRx_DMA_Init Example Description

This example shows how to configure GPIO and USART peripheral to send characters asynchronously to/from an HyperTerminal (PC) in DMA mode. This example is based on STM32C0xx USART LL API. Peripheral initialization is done using LL unitary services functions for optimization purpose (performance and size).

USART Peripheral is configured in asynchronous mode (115200 bauds, 8 data bit, 1 start bit, 1 stop bit, no parity). No HW flow control is used. GPIO associated to User push-button is linked with EXTI. Virtual Com port feature of STLINK is used for UART communication between board and PC.

Example execution:

After startup from reset and system configuration, LED1 is blinking quickly and wait User push-button action. USART and DMA are configured. On press on push button , TX DMA transfer to PC is initiated. RX DMA transfer is also ready to retrieve characters from PC (“END” string is expected to be entered by user on PC side (HyperTerminal). In case of both transfers successfully completed, LED1 is turned on. In case of errors, LED1 is blinking (1sec period).

Keywords

Connectivity, UART/USART, Asynchronous, RS-232, baud rate, DMA, HyperTerminal, Transmitter, Receiver

Directory contents

- USART/USART_Communication_TxRx_DMA_Init/Inc/stm32c0xx_it.h          Interrupt handlers header file
- USART/USART_Communication_TxRx_DMA_Init/Inc/main.h                  Header for main.c module
- USART/USART_Communication_TxRx_DMA_Init/Inc/stm32_assert.h          Template file to include assert_failed function
- USART/USART_Communication_TxRx_DMA_Init/Src/stm32c0xx_it.c          Interrupt handlers
- USART/USART_Communication_TxRx_DMA_Init/Src/main.c                  Main program
- USART/USART_Communication_TxRx_DMA_Init/Src/system_stm32c0xx.c      STM32C0xx system source file

Hardware and Software environment

How to use it ?

In order to make the program work, you must do the following :