| // 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 fuchsia.hardware.spi; |
| |
| using zx; |
| |
| [Transport = "Banjo", BanjoLayout = "ddk-protocol"] |
| protocol Spi { |
| // TODO(67570): Remove these once all drivers have switched over to the FIDL protocol. |
| |
| /// Half-duplex transmit data to a SPI device; always transmits the entire buffer on success. |
| Transmit(vector<uint8>:MAX 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>:MAX rxdata); |
| /// Full-duplex SPI transaction. Received data will exactly equal the length of the transmit |
| /// buffer. |
| Exchange(vector<uint8>:MAX txdata) -> (zx.status status, vector<uint8>:MAX rxdata); |
| |
| /// Tells the SPI driver to start listening for fuchsia.hardware.spi messages on server. |
| /// See sdk/fidl/fuchsia.hardware.spi/spi.fidl. |
| ConnectServer(zx.handle:CHANNEL server) -> (); |
| }; |