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// Copyright 2023 The Pigweed Authors
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
syntax = "proto3";
package pw.i2c;
message I2cWriteRequest {
// Which I2C initiator bus to communicate on.
uint32 bus_index = 1;
// 7-bit I2C target address to write to.
uint32 target_address = 2;
// Register address to write. Follow the endianness required by the
// responder for multi-byte address.
bytes register_address = 3;
// Value to write. Follow the endianness required by the responder.
bytes value = 4;
}
message I2cWriteResponse {}
message I2cReadRequest {
// Which I2C initiator bus to communicate on.
uint32 bus_index = 1;
// 7-bit I2C target address to read from.
uint32 target_address = 2;
// Register address to write. Follow the endianness required by the
// responder for multi-byte address.
bytes register_address = 3;
// Expected number of bytes from the responder.
uint32 read_size = 4;
}
message I2cReadResponse {
bytes value = 1;
}
service I2c {
// Enable access to I2C devices implementing register read/writes.
rpc I2cWrite(I2cWriteRequest) returns (I2cWriteResponse) {}
rpc I2cRead(I2cReadRequest) returns (I2cReadResponse) {}
}
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