| // 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 fuchsia.hardware.sharedmemory; |
| using zx; |
| |
| const uint32 MAX_TRANSFER_SIZE = 8196; // arbitrary - to be removed |
| |
| protocol Device { |
| /// Half-duplex transmit data to a SPI device; always transmits the entire buffer on success. |
| TransmitVector(vector<uint8>:MAX_TRANSFER_SIZE data) -> (zx.status status); |
| /// Half-duplex receive data from a SPI device; always reads the full size requested. |
| ReceiveVector(uint32 size) -> (zx.status status, vector<uint8>:MAX_TRANSFER_SIZE data); |
| /// Full-duplex SPI transaction. Received data will exactly equal the length of the transmit |
| /// buffer. |
| ExchangeVector(vector<uint8>:MAX_TRANSFER_SIZE txdata) |
| -> (zx.status status, vector<uint8>:MAX_TRANSFER_SIZE rxdata); |
| |
| compose fuchsia.hardware.sharedmemory.SharedVmoIo; |
| compose fuchsia.hardware.sharedmemory.SharedVmoRegister; |
| }; |