Struct Bridge 

pub struct Bridge<P> { /* private fields */ }

The bridge on a USB card, reached over a port.

Implementations

impl<P: Read + Write> Bridge<P>

pub fn new(port: P) -> Bridge<P>

Wraps a port. Nothing is sent until the bridge is asked something.

Arguments

• port - the serial device the card enumerates as, opened raw.

Returns

The bridge.

pub fn ping(&mut self) -> Result<Identity, UsbError>

Asks the bridge who it is.

Returns

Its unique identifier and firmware version.

Errors

When the port fails or the bridge answers something else.

pub fn status(&mut self) -> Result<Status, UsbError>

Asks the bridge for its clock and temperature.

Returns

The status.

Errors

When the port fails or the bridge answers something else.

pub fn write_gpio(&mut self, pin: u8, high: bool) -> Result<(), UsbError>

Drives one of the card’s pins.

Arguments

• pin - which pin, such as PIN_RESET.
• high - whether to drive it high.

Errors

When the port fails or the bridge refuses.

pub fn reset_card(&mut self) -> Result<(), UsbError>

Resets the card.

Errors

When the port fails or the bridge refuses.

pub fn power_up(&mut self) -> Result<(), UsbError>

Brings the card up the way the reference does before it is used.

The supply is switched on, the concentrator’s reset is pulsed, then the radio beside it has its own reset pulsed, which is active low.

Errors

When any of those pin writes fails.

pub fn bulk(&mut self, bulk: &Bulk, into: &mut [u8]) -> Result<usize, UsbError>

Sends a bulk of SPI transfers and reads back what the chip clocked.

Arguments

• bulk - the entries.
• into - where the answer goes, which needs as much room as the entries took plus nothing, since the answer echoes each entry at the same length.

Returns

How many bytes of answer were read, which Replies then walks.

Errors

When the port fails, the bridge answers another order, or the answer does not fit.