| // 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) {} |
| } |