USART

Hardware/Circuit Design

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

Compatible Devices and Specifications

We have successfully used the Maple 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 reference on Serial
• STMicro documentation for STM32F103RB microcontroller:
  • Datasheet (pdf)
  • Reference Manual (pdf)