STMicroelectronics AN3109 Application Note

About this manual

This application note explains how to implement an emulated FIFO using DMA and interrupts in STM32F10x microcontrollers to prevent data overflow during reception when the data length is unknown. It details the use of a circular buffer in system RAM and describes the software architecture required for this implementation.

What's inside

• FIFO emulation with DMA
• RAM FIFO emulation
• FIFO software implementation
• Receive DMA timeout
• Method 1: Timer input capture
• Method 2: System timer and interrupts

Frequently asked questions

What is the primary purpose of the FIFO emulation described in this document?

The emulation prevents data overflow in the receive buffer when the number of incoming data items is not known in advance.

What is the size of the circular buffer used in the example implementation?

The example implementation uses a circular buffer with a size of 200 bytes.

How many data bytes does the transmitter send to the receiver in the provided firmware example?

The transmitter sends 250 data bytes to the receiver in the example.