Files

adcs_api

lib.rs

cbor_protocol

lib.rs

channel_protocol

error.rslib.rsparsers.rsprotocol.rs

clyde_3g_eps_api

commands

board_status.rschecksum.rslast_error.rsmod.rsreset.rsversion.rswatchdog.rs

telemetry

daughterboard.rslib.rsmod.rsmotherboard.rsreset.rs

eps.rslib.rs

clyde_3g_eps_service

models

board_status.rsdaughterboard_telemetry.rslast_error.rsmod.rsmotherboard_telemetry.rsreset_telemetry.rssubsystem.rsversion.rs

schema

mod.rsmutation.rsquery.rs

main.rs

comms_service

config.rserrors.rslib.rspacket.rsservice.rsspacepacket.rstelemetry.rs

db_test

main.rs

eps_api

lib.rs

example_rust_c_service

main.rsmodel.rsschema.rs

example_rust_service

main.rsmodel.rsschema.rs

extern_lib

lib.rs

file_protocol

error.rslib.rsmessages.rsparsers.rsprotocol.rsstorage.rs

file_service

lib.rs

iobc_supervisor_service

main.rsmodel.rsschema.rs

isis_ants

main.rs

isis_ants_api

ants.rsffi.rslib.rsparse.rs

isis_ants_service

main.rsmodel.rsobjects.rsschema.rs

isis_imtq_api

ffi.rsimtq.rslib.rs

isis_iobc_supervisor

ffi.rslib.rs

kubos_app

framework.rslib.rsquery.rs

kubos_app_service

app_entry.rserror.rsmain.rsmonitor.rsobjects.rsregistry.rsschema.rs

kubos_build_helper

lib.rs

kubos_file_client

main.rs

kubos_service

lib.rsmacros.rsservice.rs

kubos_shell_client

main.rs

kubos_system

config.rslib.rslogger.rsuboot.rs

kubos_telemetry_db

lib.rsmodels.rs

large_download

main.rs

large_upload

main.rs

local_comms_service

comms.rsmain.rs

mai400

main.rs

mai400_api

messages

rx

irehs.rsmod.rsraw_imu.rsrotating.rsstd_telem.rs

mod.rstx.rs

lib.rsmai400.rs

mai400_service

main.rsmodel.rsobjects.rsschema.rs

monitor_service

main.rsmeminfo.rsobjects.rsprocess.rsschema.rsuserinfo.rs

novatel_oem6_api

messages

commands

log.rsmod.rsunlog.rsunlog_all.rs

logs

best_xyz.rsmod.rsrxstatusevent.rsversion.rs

mod.rs

crc32.rslib.rsoem6.rs

novatel_oem6_service

main.rsmodel.rsobjects.rsschema.rs

nsl_duplex_d2

messages

file.rsgeo_record.rsmod.rsstate_of_health.rs

duplex_d2.rslib.rsserial_comm.rs

nsl_duplex_d2_comms_service

comms.rsmain.rsmodel.rsschema.rs

obc_hs

check_fs.rscheck_mem.rscheck_reset.rsclean_db.rsmain.rsping.rs

radio_api

lib.rs

rust_i2c

lib.rs

rust_mission_app

main.rs

rust_uart

error.rslib.rsmock.rs

scheduler_service

app.rserror.rsmain.rsmode.rsscheduler.rsschema.rstask.rstask_list.rs

serial_comms_service

comms.rskiss.rsmain.rsmodel.rsschema.rs

shell_protocol

messages

error.rsexit.rskill.rslist.rsmod.rspid.rsspawn.rsstderr.rsstdin.rsstdout.rs

error.rslib.rsprocess.rsprotocol.rs

shell_service

lib.rs

telemetry_service

main.rsschema.rsudp.rs

uart_comms_client

comms.rskiss.rsmain.rs

udp_client

main.rs

utils

lib.rstesting.rs

>

//
// Copyright (C) 2018 Kubos Corporation
//
// 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
//
// http://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.
//
// CRC32 algorithm taken from Section 1.7 of the NovAtel OEM6 Firmware Reference Manual, Rev 12

const CRC32_POLY: u32 = 0xEDB8_8320;

fn calc_val(val: u8) -> u32 {
    let mut crc: u32 = val.into();
    for _num in 0..8 {
        if crc & 1 == 1 {
            crc = crc.wrapping_shr(1) ^ CRC32_POLY;
        } else {
            crc = crc.wrapping_shr(1);
        }
    }

    crc
}

pub fn calc_crc(msg: &[u8]) -> u32 {
    let mut crc: u32 = 0;

    for elem in msg.iter() {
        let val1 = crc.wrapping_shr(8);
        let arg: u32 = crc ^ u32::from(*elem);
        let val2 = calc_val(arg as u8);
        crc = val2 ^ val1;
    }

    crc
}

#[test]
fn test_crc() {
    let input = [
        0xAA, 0x44, 0x12, 0x1C, 0x24, 0x0, 0x0, 0xC0, 0x8, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
        0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x20, 0x0, 0x0, 0x0, 0xF1, 0x0, 0x0,
        0x0,
    ];

    assert_eq!(calc_crc(&input), 0x8BB09602);
}