The EmbededLocoNet Library provides functions that manage the sending and receiving of LocoNet packets.

As bytes are received from the LocoNet by an interrupt driven handler, they are stored in a circular buffer and after a valid packet has been received it can be read out.

When packets are sent successfully, they are also appended to the Receive circular buffer so they can be handled in the same manner as if they had been received from another device.

Statistics are maintained for both the transmission and reception of packets. Any invalid packets that are received are discarded and the stats are updated approproately.

This library uses TIMER1 & ICP (UNO) and/or TIMER5 and ICP5 (MEGA) resources and associated interrupt handler hooks. On the STM32, it uses TIM2 and the EXTI10-15 interrupts handler hooks. On the ESP8266, the implementation uses TIMER1 and associated interrupt handler hooks.

Currently the library only supports the AVR mega and tiny range that have an Input Capture Unit (ICP) associated with a 16-Bit Timer/Counter.

It's known to work with:

• UNO (ATmega328)
• MEGA (ATmega2560)
• Leonardo, LeoStick, Arduino Pro Micro (ATmega32U4)
• Various AVRTiny Boards (ATTiny84, ATTiny84A, ATTiny841)
• Blue Pill (STM32F1 w/ libopencm3 and Arduino Stubs)
• NodeMCU v1.0 (ESP8266 core for Arduino)

As of 2020-03-28 - Hans Tanner added the capability to change the polarity of the Rx and Tx electrical signal (depending on your circuitry) in the utility/ln_config.h file. The is controlled using the two #defines LN_SW_UART_RX_INVERTED and LN_SW_UART_TX_INVERTED

IMPORTANT

Some of the message formats used in this code are Copyright Digitrax, Inc. and/or Elektronik GmbH and are used with permission as part of the MRRwA project. That permission does not extend to uses in other software products. See the LICENSE file for more information.