sdk/banjo/ddk.protocol.spi/spi.banjo

// Copyright 2019 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

library ddk.protocol.spi;

using zx;

[Layout = "ddk-protocol"]
protocol Spi {
    /// Half-duplex transmit data to a SPI device; always transmits the entire buffer on success.
    Transmit(vector<uint8> txdata) -> (zx.status status);
    /// Half-duplex receive data from a SPI device; always reads the full size requested.
    Receive(uint32 size) -> (zx.status status, vector<uint8> rxdata);
    /// Full-duplex SPI transaction. Received data will exactly equal the length of the transmit
    /// buffer.
    Exchange(vector<uint8> txdata) -> (zx.status status, vector<uint8> rxdata);
};