#Nucleo stm32 uart interrupt how to#
#Nucleo stm32 uart interrupt serial#
#Nucleo stm32 uart interrupt full#
#Nucleo stm32 uart interrupt code#

The above function initializes the UART receive process in interrupt mode (non-blocking) and upon completion, a callback function is called to notify the application and the processor knows that the received data buffer is now ready. HAL_UART_Receive_IT ( & huart1, UART1_rxBuffer, 12 ) Until an interrupt is received, then it freezes the main context and switches to the ISR handler to save the received byte to a buffer and switches back to the main context and resume the main code. As the CPU initiates the receiving process and it resumes executing the main code.

This way of handling the UART data reception is a non-blocking way. And in the ISR code, we save the received data in a buffer for further processing. The CPU initializes the UART receive hardware so that it fires an interrupt signal whenever a new byte of data is received.

#Nucleo stm32 uart interrupt serial#

Using interrupt signals is a convenient way to achieve serial UART data reception. And obviously, it’s not an efficient way to receive serial data despite the fact that it does actually work. If it doesn’t receive that amount of data, the CPU will be kept blocked waiting for 5sec until this function returns to the main context.

#Nucleo stm32 uart interrupt code#

if it does that in 100uSec, it’s ok and the CPU will resume main code execution. HAL_UART_Receive ( & huart1, UART1_rxBuffer, 12, 5000 ) Otherwise, and if the UART peripheral for some reason didn’t receive the expected amount of data, the function will keep blocking the CPU for a certain amount of time “time-out” after which it gets terminated and gives back the control to the CPU to resume the main code. After receiving the required amount of data, the function ends and the CPU continues the main code execution. The polling method is essentially a blocking function being called from the main routine and it does block the CPU so it can’t proceed in the main task execution until a certain amount of UART data bytes are received. However, I’d like also to list down all the other possible ways in order to receive serial UART data with an STM32 microcontroller including the DMA method.

This tutorial is intended to be an example application for the DMA unit which we’ve discussed in the previous tutorial (DMA Tutorial). Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network (EPN) and.

Logic Analyzer (on ) ( on eBay)Īffiliate Disclosure: When you click on links in this section and make a purchase, this can result in this site earning a commission.

FeelTech DDS Function Generator: KKMoon FY6900 (on ) ( on eBay).

My Digital Storage Oscilloscope (DSO): Siglent SDS1104 (on ) ( on eBay).

Some Extremely Useful Test Equipment For Troubleshooting:

#Nucleo stm32 uart interrupt full#

★ Check The Full Course Complete Kit List

ST-Link v2 Debugger or ( eBay) QTY Component Name 🛒 🛒 2 BreadBoard Amazon eBay 1 LEDs Kit Amazon Amazon eBay 1 Resistors Kit Amazon Amazon eBay 1 Capacitors Kit Amazon Amazon eBay & eBay 2 Jumper Wires Pack Amazon Amazon eBay & eBay 1 9v Battery or DC Power Supply Amazon Amazon Amazon eBay 1 Micro USB Cable Amazon eBay 1 Push Buttons Amazon Amazon eBay 1 USB-TTL Converter or FTDI Chip Amazon Amazon eBay eBay.

Blue Pill STM32-F103 (ARM Cortex-M3 72MHz) or ( eBay).

Nucleo32-L432KC (ARM Cortex-M4 80MHz) or ( eBay).

And lastly, and most importantly, the DMA UART receive method which doesn’t require any CPU intervention at all and can be considered the most efficient way to achieve this task.Īll the example code/LABs/projects in the course are going to be done using those boards below. Starting with the least efficient way which is polling for the UART peripheral received data, then we’ll see the interrupt-driven reception method which involves the CPU intervention but it’s non-blocking anyway. In this tutorial, I’ll briefly list down the different ways to receive UART data in STM32 microcontrollers.

#Nucleo stm32 uart interrupt how to#

Previous Tutorial Tutorial 22 Next Tutorial How To Receive UART Serial Data With STM32 – DMA / Interrupt / Polling STM32 Course Home Page 🏠