USART — Maple v0.0.10beta Documentation

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# USART

Contents

- Hardware/Circuit Design
- Compatible Devices and Specifications
- Recommended Reading

## Hardware/Circuit Design

Each LeafLabs board has at least 3 separate USART devices. In the most simple use case, the RX and TX pins are used to send data at a predetermined baud rate with the line voltage level relative to ground. Their usage is documented in the Serial Ports language reference page.

Which pins correspond to the USART TX and RX pins are given on your board’s silkscreen, and also in the board-specific USART pin maps available here:

- Maple
- Maple RET6 Edition

If you use a particular serial port, you cannot also use its communication pins for other purposes at the same time.

## Compatible Devices and Specifications

We have successfully used the USART ports with an FT232R-based USB-serial converter at up to 115200 baud. Higher speeds should certainly be possible.

## Recommended Reading

- Wikipedia article on Universal Asynchronous Receiver/Transmitter (USART)
- Arduino Serial reference
- ST Reference Manual RM0008 (PDF), Chapter 27.

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