User Manual

Function calls

VirtualWire 5 of 13

4.1 vw_set_tx_pin

extern void vw_set_tx_pin(uint8_t pin);

Set the digital IO pin to use for transmit data. Defaults to 12.

4.2 vw_set_rx_pin

extern void vw_set_rx_pin(uint8_t pin);

Set the digital IO pin to use for receive data. Defaults to 11.

4.3 vw_set_ptt_pin

extern void vw_set_ptt_pin(uint8_t pin);

Set the digital IO pin to use to enable the transmitter (press to talk). Defaults to 10. Not

all transmitters require PTT. The DR3100 does, but the TX-B1 does not.

4.4 vw_set_ptt_inverted

extern void vw_set_ptt_inverted(uint8_t inverted);

By default the PTT pin goes high when the transmitter is enabled. This ﬂag forces it low

when the transmitter is enabled. Required for the DR3100.

4.5 vw_setup

extern void vw_setup(uint16_t speed);

Initialise the VirtualWire software, to operate at speed bits per second. Call this once in

your setup() after any vw_set_* calls. You must call vw_rx_start() after this before you

will get any messages.

4.6 vw_rx_start

extern void vw_rx_start();

Start the receiver. You must do this before you can receive any messages. When a mes-

sage is available (good checksum or not), vw_have_message() will return true.

4.7 vw_rx_stop

extern void vw_rx_stop();

Stop the receiver. No messages will be received until vw_rx_start() is called again.

Saves interrupt processing cycles when you know there will be no messages.

4.8 vw_wait_tx

extern void vw_wait_tx();