This example shows how to configure GPIO and USART peripheral for continuously receiving characters from HyperTerminal (PC) in Asynchronous mode using Interrupt mode. 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.
Example execution:
After startup from reset and system configuration, LED1 is blinking quickly.
On press on push button, USART RX Not Empty interrupt is enabled.
When character is received on USART Rx line, a RXNE interrupt occurs.
Received data is read from USART RDR register and stored in user buffer.
A double buffer is available for received data, allowing continuous reception.
User could process data received in Buffer A, while buffer B is used for reception.
When buffer B is full, it could be handled by user, while buffer A becomes active buffer for next reception, and so on.
Each time a reception buffer is full, user data process callback is called.
Data processing consists in echoing data buffer content on PC Com port, and making LED1 toggle.
In case of errors, LED1 is blinking.
Connectivity, UART/USART, Asynchronous, RS-232, baud rate, Interrupt, HyperTerminal, Continuous Reception, Receiver
- USART/USART_Communication_Rx_IT_Continuous_Init/Inc/stm32c0xx_it.h Interrupt handlers header file
- USART/USART_Communication_Rx_IT_Continuous_Init/Inc/main.h Header for main.c module
- USART/USART_Communication_Rx_IT_Continuous_Init/Inc/stm32_assert.h Template file to include assert_failed function
- USART/USART_Communication_Rx_IT_Continuous_Init/Src/stm32c0xx_it.c Interrupt handlers
- USART/USART_Communication_Rx_IT_Continuous_Init/Src/main.c Main program
- USART/USART_Communication_Rx_IT_Continuous_Init/Src/system_stm32c0xx.c STM32C0xx system source file
This example runs on STM32C071RBTx devices.
This example has been tested with NUCLEO-C071RB board and can be easily tailored to any other supported device and development board.
NUCLEO-C071RB Set-up:
Connect USART1 TX/RX to respectively RX and TX pins of PC UART (could be done through a USB to UART adapter) :
Launch serial communication SW on PC (as HyperTerminal or TeraTerm) with proper configuration (115200 bauds, 8 bits data, 1 stop bit, no parity, no HW flow control).
Launch the program. Enter characters on PC communication SW side.
In order to make the program work, you must do the following :