├── .codespellrc ├── .github ├── dependabot.yml └── workflows │ ├── check-arduino.yml │ ├── compile-examples.yml │ ├── report-size-deltas.yml │ ├── spell-check.yml │ └── sync-labels.yml ├── .gitignore ├── LICENSE.txt ├── README.adoc ├── docs ├── api.md └── readme.md ├── examples ├── RS485Passthrough │ └── RS485Passthrough.ino ├── RS485Receiver │ └── RS485Receiver.ino └── RS485Sender │ └── RS485Sender.ino ├── keywords.txt ├── library.properties └── src ├── ArduinoRS485.h ├── RS485.cpp └── RS485.h /.codespellrc: -------------------------------------------------------------------------------- 1 | # See: https://github.com/codespell-project/codespell#using-a-config-file 2 | [codespell] 3 | # In the event of a false positive, add the problematic word, in all lowercase, to a comma-separated list here: 4 | ignore-words-list = , 5 | check-filenames = 6 | check-hidden = 7 | skip = ./.git 8 | -------------------------------------------------------------------------------- /.github/dependabot.yml: -------------------------------------------------------------------------------- 1 | # See: https://docs.github.com/en/github/administering-a-repository/configuration-options-for-dependency-updates#about-the-dependabotyml-file 2 | version: 2 3 | 4 | updates: 5 | # Configure check for outdated GitHub Actions actions in workflows. 6 | # See: https://docs.github.com/en/github/administering-a-repository/keeping-your-actions-up-to-date-with-dependabot 7 | - package-ecosystem: github-actions 8 | directory: / # Check the repository's workflows under /.github/workflows/ 9 | schedule: 10 | interval: daily 11 | labels: 12 | - "topic: infrastructure" 13 | -------------------------------------------------------------------------------- /.github/workflows/check-arduino.yml: -------------------------------------------------------------------------------- 1 | name: Check Arduino 2 | 3 | # See: https://docs.github.com/en/free-pro-team@latest/actions/reference/events-that-trigger-workflows 4 | on: 5 | push: 6 | pull_request: 7 | schedule: 8 | # Run every Tuesday at 8 AM UTC to catch breakage caused by new rules added to Arduino Lint. 9 | - cron: "0 8 * * TUE" 10 | workflow_dispatch: 11 | repository_dispatch: 12 | 13 | jobs: 14 | lint: 15 | runs-on: ubuntu-latest 16 | 17 | steps: 18 | - name: Checkout repository 19 | uses: actions/checkout@v4 20 | 21 | - name: Arduino Lint 22 | uses: arduino/arduino-lint-action@v2 23 | with: 24 | compliance: specification 25 | library-manager: update 26 | # Always use this setting for official repositories. Remove for 3rd party projects. 27 | official: true 28 | project-type: library 29 | -------------------------------------------------------------------------------- /.github/workflows/compile-examples.yml: -------------------------------------------------------------------------------- 1 | name: Compile Examples 2 | 3 | # See: https://docs.github.com/en/free-pro-team@latest/actions/reference/events-that-trigger-workflows 4 | on: 5 | push: 6 | paths: 7 | - ".github/workflows/compile-examples.yml" 8 | - "examples/**" 9 | - "src/**" 10 | pull_request: 11 | paths: 12 | - ".github/workflows/compile-examples.yml" 13 | - "examples/**" 14 | - "src/**" 15 | schedule: 16 | # Run every Tuesday at 8 AM UTC to catch breakage caused by changes to external resources (libraries, platforms). 17 | - cron: "0 8 * * TUE" 18 | workflow_dispatch: 19 | repository_dispatch: 20 | 21 | jobs: 22 | build: 23 | name: ${{ matrix.board.fqbn }} 24 | runs-on: ubuntu-latest 25 | 26 | env: 27 | SKETCHES_REPORTS_PATH: sketches-reports 28 | 29 | strategy: 30 | fail-fast: false 31 | 32 | matrix: 33 | board: 34 | - fqbn: arduino:samd:mkrzero 35 | platforms: | 36 | - name: arduino:samd 37 | artifact-name-suffix: arduino-samd-mkrzero 38 | - fqbn: arduino:samd:mkr1000 39 | platforms: | 40 | - name: arduino:samd 41 | artifact-name-suffix: arduino-samd-mkr1000 42 | - fqbn: arduino:samd:mkrwifi1010 43 | platforms: | 44 | - name: arduino:samd 45 | artifact-name-suffix: arduino-samd-mkrwifi1010 46 | - fqbn: arduino:samd:mkrfox1200 47 | platforms: | 48 | - name: arduino:samd 49 | artifact-name-suffix: arduino-samd-mkrfox1200 50 | - fqbn: arduino:samd:mkrwan1300 51 | platforms: | 52 | - name: arduino:samd 53 | artifact-name-suffix: arduino-samd-mkrwan1300 54 | - fqbn: arduino:samd:mkrwan1310 55 | platforms: | 56 | - name: arduino:samd 57 | artifact-name-suffix: arduino-samd-mkrwan1310 58 | - fqbn: arduino:samd:mkrgsm1400 59 | platforms: | 60 | - name: arduino:samd 61 | artifact-name-suffix: arduino-samd-mkrgsm1400 62 | - fqbn: arduino:samd:mkrnb1500 63 | platforms: | 64 | - name: arduino:samd 65 | artifact-name-suffix: arduino-samd-mkrnb1500 66 | - fqbn: arduino:samd:mkrvidor4000 67 | platforms: | 68 | - name: arduino:samd 69 | artifact-name-suffix: arduino-samd-mkrvidor4000 70 | - fqbn: arduino:mbed_portenta:envie_m7 71 | platforms: | 72 | - name: arduino:mbed_portenta 73 | artifact-name-suffix: arduino-mbed_portenta-envie_m7 74 | - fqbn: arduino:mbed_opta:opta 75 | platforms: | 76 | - name: arduino:mbed_opta 77 | artifact-name-suffix: arduino-suffix-opta 78 | 79 | steps: 80 | - name: Checkout repository 81 | uses: actions/checkout@v4 82 | 83 | - name: Compile examples 84 | uses: arduino/compile-sketches@v1 85 | with: 86 | github-token: ${{ secrets.GITHUB_TOKEN }} 87 | fqbn: ${{ matrix.board.fqbn }} 88 | platforms: ${{ matrix.board.platforms }} 89 | libraries: | 90 | # Install the library from the local path. 91 | - source-path: ./ 92 | # Additional library dependencies can be listed here. 93 | # See: https://github.com/arduino/compile-sketches#libraries 94 | sketch-paths: | 95 | - examples 96 | enable-deltas-report: true 97 | sketches-report-path: ${{ env.SKETCHES_REPORTS_PATH }} 98 | 99 | - name: Save sketches report as workflow artifact 100 | uses: actions/upload-artifact@v4 101 | with: 102 | if-no-files-found: error 103 | path: ${{ env.SKETCHES_REPORTS_PATH }} 104 | name: sketches-report-${{ matrix.board.artifact-name-suffix }} 105 | -------------------------------------------------------------------------------- /.github/workflows/report-size-deltas.yml: -------------------------------------------------------------------------------- 1 | name: Report Size Deltas 2 | 3 | # See: https://docs.github.com/en/free-pro-team@latest/actions/reference/events-that-trigger-workflows 4 | on: 5 | push: 6 | paths: 7 | - ".github/workflows/report-size-deltas.yml" 8 | schedule: 9 | # Run at the minimum interval allowed by GitHub Actions. 10 | # Note: GitHub Actions periodically has outages which result in workflow failures. 11 | # In this event, the workflows will start passing again once the service recovers. 12 | - cron: "*/5 * * * *" 13 | workflow_dispatch: 14 | repository_dispatch: 15 | 16 | jobs: 17 | report: 18 | runs-on: ubuntu-latest 19 | steps: 20 | - name: Comment size deltas reports to PRs 21 | uses: arduino/report-size-deltas@v1 22 | with: 23 | # Regex matching the names of the workflow artifacts created by the "Compile Examples" workflow 24 | sketches-reports-source: ^sketches-report-.+ 25 | -------------------------------------------------------------------------------- /.github/workflows/spell-check.yml: -------------------------------------------------------------------------------- 1 | name: Spell Check 2 | 3 | # See: https://docs.github.com/en/free-pro-team@latest/actions/reference/events-that-trigger-workflows 4 | on: 5 | push: 6 | pull_request: 7 | schedule: 8 | # Run every Tuesday at 8 AM UTC to catch new misspelling detections resulting from dictionary updates. 9 | - cron: "0 8 * * TUE" 10 | workflow_dispatch: 11 | repository_dispatch: 12 | 13 | jobs: 14 | spellcheck: 15 | runs-on: ubuntu-latest 16 | 17 | steps: 18 | - name: Checkout repository 19 | uses: actions/checkout@v4 20 | 21 | - name: Spell check 22 | uses: codespell-project/actions-codespell@master 23 | -------------------------------------------------------------------------------- /.github/workflows/sync-labels.yml: -------------------------------------------------------------------------------- 1 | # Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/sync-labels.md 2 | name: Sync Labels 3 | 4 | # See: https://docs.github.com/en/actions/reference/events-that-trigger-workflows 5 | on: 6 | push: 7 | paths: 8 | - ".github/workflows/sync-labels.ya?ml" 9 | - ".github/label-configuration-files/*.ya?ml" 10 | pull_request: 11 | paths: 12 | - ".github/workflows/sync-labels.ya?ml" 13 | - ".github/label-configuration-files/*.ya?ml" 14 | schedule: 15 | # Run daily at 8 AM UTC to sync with changes to shared label configurations. 16 | - cron: "0 8 * * *" 17 | workflow_dispatch: 18 | repository_dispatch: 19 | 20 | env: 21 | CONFIGURATIONS_FOLDER: .github/label-configuration-files 22 | CONFIGURATIONS_ARTIFACT: label-configuration-files 23 | 24 | jobs: 25 | check: 26 | runs-on: ubuntu-latest 27 | 28 | steps: 29 | - name: Checkout repository 30 | uses: actions/checkout@v4 31 | 32 | - name: Download JSON schema for labels configuration file 33 | id: download-schema 34 | uses: carlosperate/download-file-action@v2 35 | with: 36 | file-url: https://raw.githubusercontent.com/arduino/tooling-project-assets/main/workflow-templates/assets/sync-labels/arduino-tooling-gh-label-configuration-schema.json 37 | location: ${{ runner.temp }}/label-configuration-schema 38 | 39 | - name: Install JSON schema validator 40 | run: | 41 | sudo npm install \ 42 | --global \ 43 | ajv-cli \ 44 | ajv-formats 45 | 46 | - name: Validate local labels configuration 47 | run: | 48 | # See: https://github.com/ajv-validator/ajv-cli#readme 49 | ajv validate \ 50 | --all-errors \ 51 | -c ajv-formats \ 52 | -s "${{ steps.download-schema.outputs.file-path }}" \ 53 | -d "${{ env.CONFIGURATIONS_FOLDER }}/*.{yml,yaml}" 54 | 55 | download: 56 | needs: check 57 | runs-on: ubuntu-latest 58 | 59 | strategy: 60 | matrix: 61 | filename: 62 | # Filenames of the shared configurations to apply to the repository in addition to the local configuration. 63 | # https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/assets/sync-labels 64 | - universal.yml 65 | 66 | steps: 67 | - name: Download 68 | uses: carlosperate/download-file-action@v2 69 | with: 70 | file-url: https://raw.githubusercontent.com/arduino/tooling-project-assets/main/workflow-templates/assets/sync-labels/${{ matrix.filename }} 71 | 72 | - name: Pass configuration files to next job via workflow artifact 73 | uses: actions/upload-artifact@v4 74 | with: 75 | path: | 76 | *.yaml 77 | *.yml 78 | if-no-files-found: error 79 | name: ${{ env.CONFIGURATIONS_ARTIFACT }} 80 | 81 | sync: 82 | needs: download 83 | runs-on: ubuntu-latest 84 | 85 | steps: 86 | - name: Set environment variables 87 | run: | 88 | # See: https://docs.github.com/en/actions/reference/workflow-commands-for-github-actions#setting-an-environment-variable 89 | echo "MERGED_CONFIGURATION_PATH=${{ runner.temp }}/labels.yml" >> "$GITHUB_ENV" 90 | 91 | - name: Determine whether to dry run 92 | id: dry-run 93 | if: > 94 | github.event_name == 'pull_request' || 95 | ( 96 | ( 97 | github.event_name == 'push' || 98 | github.event_name == 'workflow_dispatch' 99 | ) && 100 | github.ref != format('refs/heads/{0}', github.event.repository.default_branch) 101 | ) 102 | run: | 103 | # Use of this flag in the github-label-sync command will cause it to only check the validity of the 104 | # configuration. 105 | echo "::set-output name=flag::--dry-run" 106 | 107 | - name: Checkout repository 108 | uses: actions/checkout@v4 109 | 110 | - name: Download configuration files artifact 111 | uses: actions/download-artifact@v4 112 | with: 113 | name: ${{ env.CONFIGURATIONS_ARTIFACT }} 114 | path: ${{ env.CONFIGURATIONS_FOLDER }} 115 | 116 | - name: Remove unneeded artifact 117 | uses: geekyeggo/delete-artifact@v5 118 | with: 119 | name: ${{ env.CONFIGURATIONS_ARTIFACT }} 120 | 121 | - name: Merge label configuration files 122 | run: | 123 | # Merge all configuration files 124 | shopt -s extglob 125 | cat "${{ env.CONFIGURATIONS_FOLDER }}"/*.@(yml|yaml) > "${{ env.MERGED_CONFIGURATION_PATH }}" 126 | 127 | - name: Install github-label-sync 128 | run: sudo npm install --global github-label-sync 129 | 130 | - name: Sync labels 131 | env: 132 | GITHUB_ACCESS_TOKEN: ${{ secrets.GITHUB_TOKEN }} 133 | run: | 134 | # See: https://github.com/Financial-Times/github-label-sync 135 | github-label-sync \ 136 | --labels "${{ env.MERGED_CONFIGURATION_PATH }}" \ 137 | ${{ steps.dry-run.outputs.flag }} \ 138 | ${{ github.repository }} 139 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | .idea/ 2 | -------------------------------------------------------------------------------- /LICENSE.txt: -------------------------------------------------------------------------------- 1 | GNU LESSER GENERAL PUBLIC LICENSE 2 | Version 2.1, February 1999 3 | 4 | Copyright (C) 1991, 1999 Free Software Foundation, Inc. 5 | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 6 | Everyone is permitted to copy and distribute verbatim copies 7 | of this license document, but changing it is not allowed. 8 | 9 | [This is the first released version of the Lesser GPL. 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See the GNU 484 | Lesser General Public License for more details. 485 | 486 | You should have received a copy of the GNU Lesser General Public 487 | License along with this library; if not, write to the Free Software 488 | Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 489 | USA 490 | 491 | Also add information on how to contact you by electronic and paper mail. 492 | 493 | You should also get your employer (if you work as a programmer) or your 494 | school, if any, to sign a "copyright disclaimer" for the library, if 495 | necessary. Here is a sample; alter the names: 496 | 497 | Yoyodyne, Inc., hereby disclaims all copyright interest in the 498 | library `Frob' (a library for tweaking knobs) written by James Random 499 | Hacker. 500 | 501 | , 1 April 1990 502 | Ty Coon, President of Vice 503 | 504 | That's all there is to it! 505 | -------------------------------------------------------------------------------- /README.adoc: -------------------------------------------------------------------------------- 1 | :repository-owner: arduino-libraries 2 | :repository-name: ArduinoRS485 3 | 4 | = {repository-name} Library for Arduino = 5 | 6 | image:https://github.com/{repository-owner}/{repository-name}/actions/workflows/check-arduino.yml/badge.svg["Check Arduino status", link="https://github.com/{repository-owner}/{repository-name}/actions/workflows/check-arduino.yml"] 7 | image:https://github.com/{repository-owner}/{repository-name}/actions/workflows/compile-examples.yml/badge.svg["Compile Examples status", link="https://github.com/{repository-owner}/{repository-name}/actions/workflows/compile-examples.yml"] 8 | image:https://github.com/{repository-owner}/{repository-name}/actions/workflows/spell-check.yml/badge.svg["Spell Check status", link="https://github.com/{repository-owner}/{repository-name}/actions/workflows/spell-check.yml"] 9 | 10 | Enables sending and receiving data using the RS-485 standard with RS-485 shields, like the MKR 485 Shield. 11 | 12 | This library supports the Maxim Integrated MAX3157 and equivalent chipsets. 13 | 14 | For more information about this library please visit us at 15 | http://www.arduino.cc/en/Reference/{repository-name} 16 | -------------------------------------------------------------------------------- /docs/api.md: -------------------------------------------------------------------------------- 1 | # Arduino RS485 library 2 | 3 | ## Methods 4 | 5 | ### `begin()` 6 | 7 | Initializes the RS485 object communication speed. 8 | 9 | #### Syntax 10 | 11 | ``` 12 | RS485.begin(baudrate) 13 | ``` 14 | 15 | #### Parameters 16 | 17 | * _baudrate_: communication speed in bits per second (baud). 18 | 19 | #### Returns 20 | 21 | None. 22 | 23 | #### See also 24 | 25 | * [end()](#end) 26 | * [available()](#available) 27 | * [peek()](#peek) 28 | * [read()](#read) 29 | * [write()](#write) 30 | * [flush()](#flush) 31 | * [beginTransmission()](#begintransmission) 32 | * [endTransmission()](#endtransmission) 33 | * [receive()](#receive) 34 | * [noReceive()](#noreceive) 35 | * [sendBreak()](#sendbreak) 36 | * [sendBreakMicroseconds()](#sendbreakmicroseconds) 37 | * [setPins()](#setpins) 38 | 39 | ### `end()` 40 | 41 | Disables RS485 communication. 42 | 43 | #### Syntax 44 | 45 | ``` 46 | RS485.end() 47 | ``` 48 | 49 | #### Parameters 50 | 51 | None. 52 | 53 | #### Returns 54 | 55 | None. 56 | 57 | #### See also 58 | 59 | * [begin()](#begin) 60 | * [available()](#available) 61 | * [peek()](#peek) 62 | * [read()](#read) 63 | * [write()](#write) 64 | * [flush()](#flush) 65 | * [beginTransmission()](#begintransmission) 66 | * [endTransmission()](#endtransmission) 67 | * [receive()](#receive) 68 | * [noReceive()](#noreceive) 69 | * [sendBreak()](#sendbreak) 70 | * [sendBreakMicroseconds()](#sendbreakmicroseconds) 71 | * [setPins()](#setpins) 72 | 73 | ### `available()` 74 | 75 | Get the number of bytes (characters) available for reading from the RS485 port. This is data that already arrived and is stored in the serial receive buffer. 76 | 77 | #### Syntax 78 | 79 | ``` 80 | RS485.available() 81 | ``` 82 | 83 | #### Parameters 84 | 85 | None. 86 | 87 | #### Returns 88 | 89 | The number of bytes available to read. 90 | 91 | #### See also 92 | 93 | * [begin()](#begin) 94 | * [end()](#end) 95 | * [peek()](#peek) 96 | * [read()](#read) 97 | * [write()](#write) 98 | * [flush()](#flush) 99 | * [beginTransmission()](#begintransmission) 100 | * [endTransmission()](#endtransmission) 101 | * [receive()](#receive) 102 | * [noReceive()](#noreceive) 103 | * [sendBreak()](#sendbreak) 104 | * [sendBreakMicroseconds()](#sendbreakmicroseconds) 105 | * [setPins()](#setpins) 106 | 107 | ### `peek()` 108 | 109 | Returns the next byte (character) of the incoming serial data without removing it from the internal serial buffer. That is, successive calls to peek() will return the same character, as will the next call to read(). 110 | 111 | #### Syntax 112 | 113 | ``` 114 | RS485.peek() 115 | ``` 116 | 117 | #### Parameters 118 | 119 | None. 120 | 121 | #### Returns 122 | 123 | The first byte of incoming serial data available or -1 if no data is available. 124 | 125 | #### See also 126 | 127 | * [begin()](#begin) 128 | * [end()](#end) 129 | * [available()](#available) 130 | * [read()](#read) 131 | * [write()](#write) 132 | * [flush()](#flush) 133 | * [beginTransmission()](#begintransmission) 134 | * [endTransmission()](#endtransmission) 135 | * [receive()](#receive) 136 | * [noReceive()](#noreceive) 137 | * [sendBreak()](#sendbreak) 138 | * [sendBreakMicroseconds()](#sendbreakmicroseconds) 139 | * [setPins()](#setpins) 140 | 141 | ### `read()` 142 | 143 | Reads incoming serial data. 144 | 145 | #### Syntax 146 | 147 | ``` 148 | RS485.read() 149 | ``` 150 | 151 | #### Parameters 152 | 153 | None. 154 | 155 | #### Returns 156 | 157 | The first byte of incoming serial data available or -1 if no data is available. 158 | 159 | #### See also 160 | 161 | * [begin()](#begin) 162 | * [end()](#end) 163 | * [available()](#available) 164 | * [peak()](#peak) 165 | * [write()](#write) 166 | * [flush()](#flush) 167 | * [beginTransmission()](#begintransmission) 168 | * [endTransmission()](#endtransmission) 169 | * [receive()](#receive) 170 | * [noReceive()](#noreceive) 171 | * [sendBreak()](#sendbreak) 172 | * [sendBreakMicroseconds()](#sendbreakmicroseconds) 173 | * [setPins()](#setpins) 174 | 175 | ### `write()` 176 | 177 | Writes binary data to the serial port. This data is sent as a byte or series of bytes. 178 | 179 | #### Syntax 180 | 181 | ``` 182 | RS485.write(uint8_t b) 183 | ``` 184 | 185 | #### Parameters 186 | 187 | * _b_: unsigned char. 188 | 189 | #### Returns 190 | 191 | The number of bytes written. 192 | 193 | #### See also 194 | 195 | * [begin()](#begin) 196 | * [end()](#end) 197 | * [available()](#available) 198 | * [peak()](#peak) 199 | * [read()](#write) 200 | * [flush()](#flush) 201 | * [beginTransmission()](#begintransmission) 202 | * [endTransmission()](#endtransmission) 203 | * [receive()](#receive) 204 | * [noReceive()](#noreceive) 205 | * [sendBreak()](#sendbreak) 206 | * [sendBreakMicroseconds()](#sendbreakmicroseconds) 207 | * [setPins()](#setpins) 208 | 209 | ### `flush()` 210 | 211 | Waits for the transmission of outgoing serial data to complete. 212 | 213 | #### Syntax 214 | 215 | ``` 216 | RS485.flush() 217 | ``` 218 | 219 | #### Parameters 220 | 221 | None. 222 | 223 | #### Returns 224 | 225 | None. 226 | 227 | #### See also 228 | 229 | * [begin()](#begin) 230 | * [end()](#end) 231 | * [available()](#available) 232 | * [peak()](#peak) 233 | * [read()](#write) 234 | * [write()](#write) 235 | * [beginTransmission()](#begintransmission) 236 | * [endTransmission()](#endtransmission) 237 | * [receive()](#receive) 238 | * [noReceive()](#noreceive) 239 | * [sendBreak()](#sendbreak) 240 | * [sendBreakMicroseconds()](#sendbreakmicroseconds) 241 | * [setPins()](#setpins) 242 | 243 | ### `beginTransmission()` 244 | 245 | Enables RS-485 transmission. 246 | 247 | #### Syntax 248 | 249 | ``` 250 | RS485.beginTransmission() 251 | ``` 252 | 253 | #### Parameters 254 | 255 | None. 256 | 257 | #### Returns 258 | 259 | None. 260 | 261 | #### Example 262 | 263 | ``` 264 | #include 265 | 266 | int counter = 0; 267 | 268 | void setup() { 269 | RS485.begin(9600); 270 | } 271 | 272 | void loop() { 273 | RS485.beginTransmission(); 274 | RS485.print("Counter: "); 275 | RS485.println(counter); 276 | RS485.endTransmission(); 277 | 278 | counter++; 279 | 280 | delay(1000); 281 | } 282 | ``` 283 | 284 | #### See also 285 | 286 | * [begin()](#begin) 287 | * [end()](#end) 288 | * [available()](#available) 289 | * [peak()](#peak) 290 | * [read()](#write) 291 | * [write()](#write) 292 | * [flush()](#flush) 293 | * [endTransmission()](#endtransmission) 294 | * [receive()](#receive) 295 | * [noReceive()](#noreceive) 296 | * [sendBreak()](#sendbreak) 297 | * [sendBreakMicroseconds()](#sendbreakmicroseconds) 298 | * [setPins()](#setpins) 299 | 300 | ### `endTransmission()` 301 | 302 | Disables RS-485 transmission. 303 | 304 | #### Syntax 305 | 306 | ``` 307 | RS485.endTransmission() 308 | ``` 309 | 310 | #### Parameters 311 | 312 | None. 313 | 314 | #### Returns 315 | 316 | None. 317 | 318 | #### Example 319 | 320 | ``` 321 | #include 322 | 323 | int counter = 0; 324 | 325 | void setup() { 326 | RS485.begin(9600); 327 | } 328 | 329 | void loop() { 330 | RS485.beginTransmission(); 331 | RS485.print("Counter: "); 332 | RS485.println(counter); 333 | RS485.endTransmission(); 334 | 335 | counter++; 336 | 337 | delay(1000); 338 | } 339 | ``` 340 | 341 | #### See also 342 | 343 | * [begin()](#begin) 344 | * [end()](#end) 345 | * [available()](#available) 346 | * [peak()](#peak) 347 | * [read()](#write) 348 | * [write()](#write) 349 | * [flush()](#flush) 350 | * [beginTransmission()](#begintransmission) 351 | * [receive()](#receive) 352 | * [noReceive()](#noreceive) 353 | * [sendBreak()](#sendbreak) 354 | * [sendBreakMicroseconds()](#sendbreakmicroseconds) 355 | * [setPins()](#setpins) 356 | 357 | ### `receive()` 358 | 359 | Enables reception. 360 | 361 | #### Syntax 362 | 363 | ``` 364 | RS485.receive() 365 | ``` 366 | 367 | #### Parameters 368 | 369 | None. 370 | 371 | #### Returns 372 | 373 | None. 374 | 375 | #### Example 376 | 377 | ``` 378 | #include 379 | 380 | void setup() { 381 | Serial.begin(9600); 382 | while (!Serial); 383 | 384 | RS485.begin(9600); 385 | 386 | // Enable data reception 387 | RS485.receive(); 388 | } 389 | 390 | void loop() { 391 | if (RS485.available()) { 392 | Serial.write(RS485.read()); 393 | } 394 | } 395 | ``` 396 | 397 | #### See also 398 | 399 | * [begin()](#begin) 400 | * [end()](#end) 401 | * [available()](#available) 402 | * [peak()](#peak) 403 | * [read()](#write) 404 | * [write()](#write) 405 | * [flush()](#flush) 406 | * [beginTransmission()](#begintransmission) 407 | * [endTransmission()](#endtransmission) 408 | * [noReceive()](#noreceive) 409 | * [sendBreak()](#sendbreak) 410 | * [sendBreakMicroseconds()](#sendbreakmicroseconds) 411 | * [setPins()](#setpins) 412 | 413 | ### `noReceive()` 414 | 415 | Disables reception. 416 | 417 | #### Syntax 418 | 419 | ``` 420 | RS485.noReceive() 421 | ``` 422 | 423 | #### Parameters 424 | 425 | None. 426 | 427 | #### Returns 428 | 429 | None. 430 | 431 | #### See also 432 | 433 | * [begin()](#begin) 434 | * [end()](#end) 435 | * [available()](#available) 436 | * [peak()](#peak) 437 | * [read()](#write) 438 | * [write()](#write) 439 | * [flush()](#flush) 440 | * [beginTransmission()](#begintransmission) 441 | * [endTransmission()](#endtransmission) 442 | * [receive()](#receive) 443 | * [sendBreak()](#sendbreak) 444 | * [sendBreakMicroseconds()](#sendbreakmicroseconds) 445 | * [setPins()](#setpins) 446 | 447 | ### `sendBreak()` 448 | 449 | Sends a serial break signal for the specified duration in milliseconds. 450 | 451 | #### Syntax 452 | 453 | ``` 454 | RS485.sendBreak(unsigned int duration) 455 | ``` 456 | 457 | #### Parameters 458 | 459 | * _duration_: Duration of the break signal in milliseconds. 460 | 461 | #### Returns 462 | 463 | None. 464 | 465 | #### See also 466 | 467 | * [begin()](#begin) 468 | * [end()](#end) 469 | * [available()](#available) 470 | * [peak()](#peak) 471 | * [read()](#write) 472 | * [write()](#write) 473 | * [flush()](#flush) 474 | * [beginTransmission()](#begintransmission) 475 | * [endTransmission()](#endtransmission) 476 | * [receive()](#receive) 477 | * [noReceive()](#noreceive) 478 | * [sendBreakMicroseconds()](#sendbreakmicroseconds) 479 | * [setPins()](#setpins) 480 | 481 | ### `sendBreakMicroseconds()` 482 | 483 | Sends a serial break signal for the specified duration in microseconds. 484 | 485 | #### Syntax 486 | 487 | ``` 488 | RS485.sendBreak(unsigned int duration) 489 | ``` 490 | 491 | #### Parameters 492 | 493 | * _duration_: Duration of the break signal in microseconds. 494 | 495 | #### Returns 496 | 497 | None. 498 | 499 | #### See also 500 | 501 | * [begin()](#begin) 502 | * [end()](#end) 503 | * [available()](#available) 504 | * [peak()](#peak) 505 | * [read()](#write) 506 | * [write()](#write) 507 | * [flush()](#flush) 508 | * [beginTransmission()](#begintransmission) 509 | * [endTransmission()](#endtransmission) 510 | * [receive()](#receive) 511 | * [noReceive()](#noreceive) 512 | * [sendBreak()](#sendbreak) 513 | * [setPins()](#setpins) 514 | 515 | ### `setPins()` 516 | 517 | Modify the pins used to communicate with the MAX3157 chipset. By default the library uses pin 14 for TX, pin A6 for drive output enable, and pin A5 for receiver output enable. 518 | 519 | #### Syntax 520 | 521 | ``` 522 | RS485.setPins(int txPin, int dePin, int rePin) 523 | ``` 524 | 525 | #### Parameters 526 | 527 | * _txPin_: transmission pin (used to send break signals). 528 | * _dePin_: drive output enable pin. 529 | * _rePin_: receiver output enable pin. 530 | 531 | #### Returns 532 | 533 | None. 534 | 535 | #### See also 536 | 537 | * [begin()](#begin) 538 | * [end()](#end) 539 | * [available()](#available) 540 | * [peak()](#peak) 541 | * [read()](#write) 542 | * [write()](#write) 543 | * [flush()](#flush) 544 | * [beginTransmission()](#begintransmission) 545 | * [endTransmission()](#endtransmission) 546 | * [receive()](#receive) 547 | * [noReceive()](#noreceive) 548 | * [sendBreak()](#sendbreak) 549 | * [sendBreakMicroseconds()](#sendbreakmicroseconds) -------------------------------------------------------------------------------- /docs/readme.md: -------------------------------------------------------------------------------- 1 | # Arduino RS485 library 2 | 3 | 4 | The Arduino RS485 library enables you to send and receive data using the RS-485 standard with Arduino® RS485 Shields, like the MKR 485 Shield. Please refer to the [MKR RS485 Shield](https://www.arduino.cc/en/Guide/MKR485Shield) documentation for the specific settings about half, full duplex, and termination. 5 | 6 | This library supports the MAX3157 and equivalent chipsets. 7 | 8 | To use this library: 9 | 10 | ``` 11 | #include 12 | ``` 13 | -------------------------------------------------------------------------------- /examples/RS485Passthrough/RS485Passthrough.ino: -------------------------------------------------------------------------------- 1 | /* 2 | RS-485 Passthrough 3 | 4 | This sketch relays data sent and received between the Serial port and the RS-485 interface 5 | 6 | Circuit: 7 | - MKR board 8 | - MKR 485 Shield 9 | - ISO GND connected to GND of the RS-485 device 10 | - Y connected to A of the RS-485 device 11 | - Z connected to B of the RS-485 device 12 | - A connected to Y of the RS-485 device 13 | - B connected to Z of the RS-485 device 14 | - Jumper positions 15 | - FULL set to ON 16 | - Z \/\/ Y set to ON, if the RS-485 device doesn't provide termination 17 | - B \/\/ A set to ON, if the RS-485 device doesn't provide termination 18 | 19 | created 4 July 2018 20 | by Sandeep Mistry 21 | */ 22 | 23 | #include 24 | 25 | void setup() { 26 | Serial.begin(9600); 27 | RS485.begin(9600); 28 | 29 | // enable transmission, can be disabled with: RS485.endTransmission(); 30 | RS485.beginTransmission(); 31 | 32 | // enable reception, can be disabled with: RS485.noReceive(); 33 | RS485.receive(); 34 | } 35 | 36 | void loop() { 37 | if (Serial.available()) { 38 | RS485.write(Serial.read()); 39 | } 40 | 41 | if (RS485.available()) { 42 | Serial.write(RS485.read()); 43 | } 44 | } 45 | -------------------------------------------------------------------------------- /examples/RS485Receiver/RS485Receiver.ino: -------------------------------------------------------------------------------- 1 | /* 2 | RS-485 Receiver 3 | 4 | This sketch receives data over RS-485 interface and outputs the data to the Serial interface 5 | 6 | Circuit: 7 | - MKR board 8 | - MKR 485 shield 9 | - ISO GND connected to GND of the RS-485 device 10 | - A connected to A/Y of the RS-485 device 11 | - B connected to B/Z of the RS-485 device 12 | - Jumper positions 13 | - FULL set to ON 14 | - A \/\/ B set to OFF 15 | 16 | created 4 July 2018 17 | by Sandeep Mistry 18 | */ 19 | 20 | #include 21 | 22 | void setup() { 23 | Serial.begin(9600); 24 | while (!Serial); 25 | 26 | RS485.begin(9600); 27 | 28 | // enable reception, can be disabled with: RS485.noReceive(); 29 | RS485.receive(); 30 | } 31 | 32 | void loop() { 33 | if (RS485.available()) { 34 | Serial.write(RS485.read()); 35 | } 36 | } 37 | 38 | -------------------------------------------------------------------------------- /examples/RS485Sender/RS485Sender.ino: -------------------------------------------------------------------------------- 1 | /* 2 | RS-485 Sender 3 | 4 | This sketch periodically sends a string over the RS-485 interface 5 | 6 | Circuit: 7 | - MKR board 8 | - MKR 485 shield 9 | - ISO GND connected to GND of the RS-485 device 10 | - Y connected to A of the RS-485 device 11 | - Z connected to B of the RS-485 device 12 | - Jumper positions 13 | - FULL set to ON 14 | - Z \/\/ Y set to ON 15 | 16 | created 4 July 2018 17 | by Sandeep Mistry 18 | */ 19 | 20 | #include 21 | 22 | int counter = 0; 23 | 24 | void setup() { 25 | RS485.begin(9600); 26 | } 27 | 28 | void loop() { 29 | RS485.beginTransmission(); 30 | RS485.print("hello "); 31 | RS485.println(counter); 32 | RS485.endTransmission(); 33 | 34 | counter++; 35 | 36 | delay(1000); 37 | } 38 | -------------------------------------------------------------------------------- /keywords.txt: -------------------------------------------------------------------------------- 1 | ####################################### 2 | # Syntax Coloring Map For ArduinoRS485 3 | ####################################### 4 | 5 | ####################################### 6 | # Datatypes (KEYWORD1) 7 | ####################################### 8 | 9 | ArduinoRS485 KEYWORD1 10 | RS485 KEYWORD1 11 | 12 | ####################################### 13 | # Methods and Functions (KEYWORD2) 14 | ####################################### 15 | 16 | begin KEYWORD2 17 | end KEYWORD2 18 | peek KEYWORD2 19 | read KEYWORD2 20 | flush KEYWORD2 21 | write KEYWORD2 22 | 23 | beginTransmission KEYWORD2 24 | endTransmission KEYWORD2 25 | receive KEYWORD2 26 | noReceive KEYWORD2 27 | sendBreak KEYWORD2 28 | sendBreakMicroseconds KEYWORD2 29 | setPins KEYWORD2 30 | 31 | ####################################### 32 | # Constants (LITERAL1) 33 | ####################################### 34 | -------------------------------------------------------------------------------- /library.properties: -------------------------------------------------------------------------------- 1 | name=ArduinoRS485 2 | version=1.1.0 3 | author=Arduino 4 | maintainer=Arduino 5 | sentence=Enables sending and receiving data using the RS-485 standard with RS-485 shields, like the MKR 485 Shield. 6 | paragraph=This library supports the Maxim Integrated MAX3157 and equivalent chipsets. 7 | category=Communication 8 | url=http://www.arduino.cc/en/Reference/ArduinoRS485 9 | architectures=samd,mbed_portenta,mbed_opta,mbed_nano,renesas_uno 10 | includes=ArduinoRS485.h 11 | -------------------------------------------------------------------------------- /src/ArduinoRS485.h: -------------------------------------------------------------------------------- 1 | /* 2 | This file is part of the ArduinoRS485 library. 3 | Copyright (c) 2018 Arduino SA. All rights reserved. 4 | 5 | This library is free software; you can redistribute it and/or 6 | modify it under the terms of the GNU Lesser General Public 7 | License as published by the Free Software Foundation; either 8 | version 2.1 of the License, or (at your option) any later version. 9 | 10 | This library is distributed in the hope that it will be useful, 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 | Lesser General Public License for more details. 14 | 15 | You should have received a copy of the GNU Lesser General Public 16 | License along with this library; if not, write to the Free Software 17 | Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 18 | */ 19 | 20 | #ifndef _ARDUINO_RS485_H_INCLUDED 21 | #define _ARDUINO_RS485_H_INCLUDED 22 | 23 | #include "RS485.h" 24 | 25 | #endif 26 | -------------------------------------------------------------------------------- /src/RS485.cpp: -------------------------------------------------------------------------------- 1 | /* 2 | This file is part of the ArduinoRS485 library. 3 | Copyright (c) 2018 Arduino SA. All rights reserved. 4 | 5 | This library is free software; you can redistribute it and/or 6 | modify it under the terms of the GNU Lesser General Public 7 | License as published by the Free Software Foundation; either 8 | version 2.1 of the License, or (at your option) any later version. 9 | 10 | This library is distributed in the hope that it will be useful, 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 | Lesser General Public License for more details. 14 | 15 | You should have received a copy of the GNU Lesser General Public 16 | License along with this library; if not, write to the Free Software 17 | Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 18 | */ 19 | 20 | #include "RS485.h" 21 | 22 | #ifdef __MBED__ 23 | #include "pinDefinitions.h" 24 | RS485Class::RS485Class(HardwareSerial& hwSerial, PinName txPin, PinName dePin, PinName rePin) : 25 | _serial(&hwSerial), 26 | _txPin(PinNameToIndex(txPin)), 27 | _dePin(PinNameToIndex(dePin)), 28 | _rePin(PinNameToIndex(rePin)), 29 | _transmisionBegun(false) 30 | { 31 | } 32 | #endif 33 | 34 | RS485Class::RS485Class(HardwareSerial& hwSerial, int txPin, int dePin, int rePin) : 35 | _serial(&hwSerial), 36 | _txPin(txPin), 37 | _dePin(dePin), 38 | _rePin(rePin), 39 | _transmisionBegun(false) 40 | { 41 | } 42 | 43 | void RS485Class::begin(unsigned long baudrate) 44 | { 45 | begin(baudrate, SERIAL_8N1, RS485_DEFAULT_PRE_DELAY, RS485_DEFAULT_POST_DELAY); 46 | } 47 | 48 | void RS485Class::begin(unsigned long baudrate, int predelay, int postdelay) 49 | { 50 | begin(baudrate, SERIAL_8N1, predelay, postdelay); 51 | } 52 | 53 | void RS485Class::begin(unsigned long baudrate, uint16_t config) 54 | { 55 | begin(baudrate, config, RS485_DEFAULT_PRE_DELAY, RS485_DEFAULT_POST_DELAY); 56 | } 57 | 58 | void RS485Class::begin(unsigned long baudrate, uint16_t config, int predelay, int postdelay) 59 | { 60 | _baudrate = baudrate; 61 | _config = config; 62 | 63 | // Set only if not already initialized with ::setDelays 64 | _predelay = _predelay == 0 ? predelay : _predelay; 65 | _postdelay = _postdelay == 0 ? postdelay : _postdelay; 66 | 67 | if (_dePin > -1) { 68 | pinMode(_dePin, OUTPUT); 69 | digitalWrite(_dePin, LOW); 70 | } 71 | 72 | if (_rePin > -1) { 73 | pinMode(_rePin, OUTPUT); 74 | digitalWrite(_rePin, HIGH); 75 | } 76 | 77 | _transmisionBegun = false; 78 | 79 | #if defined(ARDUINO_OPTA) 80 | auto _opta_uart = static_cast(_serial); 81 | _opta_uart->begin(baudrate, config, true); 82 | #else 83 | _serial->begin(baudrate, config); 84 | #endif 85 | } 86 | 87 | void RS485Class::end() 88 | { 89 | _serial->end(); 90 | 91 | if (_dePin > -1) { 92 | digitalWrite(_dePin, LOW); 93 | pinMode(_dePin, INPUT); 94 | } 95 | 96 | if (_rePin > -1) { 97 | digitalWrite(_rePin, LOW); 98 | pinMode(_rePin, INPUT); 99 | } 100 | } 101 | 102 | int RS485Class::available() 103 | { 104 | return _serial->available(); 105 | } 106 | 107 | int RS485Class::peek() 108 | { 109 | return _serial->peek(); 110 | } 111 | 112 | int RS485Class::read(void) 113 | { 114 | return _serial->read(); 115 | } 116 | 117 | void RS485Class::flush() 118 | { 119 | return _serial->flush(); 120 | } 121 | 122 | size_t RS485Class::write(uint8_t b) 123 | { 124 | if (!_transmisionBegun) { 125 | setWriteError(); 126 | return 0; 127 | } 128 | 129 | return _serial->write(b); 130 | } 131 | 132 | RS485Class::operator bool() 133 | { 134 | return true; 135 | } 136 | 137 | void RS485Class::beginTransmission() 138 | { 139 | if (_dePin > -1) { 140 | digitalWrite(_dePin, HIGH); 141 | if (_predelay) delayMicroseconds(_predelay); 142 | } 143 | 144 | _transmisionBegun = true; 145 | } 146 | 147 | void RS485Class::endTransmission() 148 | { 149 | _serial->flush(); 150 | 151 | if (_dePin > -1) { 152 | if (_postdelay) delayMicroseconds(_postdelay); 153 | digitalWrite(_dePin, LOW); 154 | } 155 | 156 | _transmisionBegun = false; 157 | } 158 | 159 | void RS485Class::receive() 160 | { 161 | if (_rePin > -1) { 162 | digitalWrite(_rePin, LOW); 163 | } 164 | } 165 | 166 | void RS485Class::noReceive() 167 | { 168 | if (_rePin > -1) { 169 | digitalWrite(_rePin, HIGH); 170 | } 171 | } 172 | 173 | void RS485Class::sendBreak(unsigned int duration) 174 | { 175 | _serial->flush(); 176 | _serial->end(); 177 | pinMode(_txPin, OUTPUT); 178 | digitalWrite(_txPin, LOW); 179 | delay(duration); 180 | _serial->begin(_baudrate, _config); 181 | } 182 | 183 | void RS485Class::sendBreakMicroseconds(unsigned int duration) 184 | { 185 | _serial->flush(); 186 | _serial->end(); 187 | pinMode(_txPin, OUTPUT); 188 | digitalWrite(_txPin, LOW); 189 | delayMicroseconds(duration); 190 | _serial->begin(_baudrate, _config); 191 | } 192 | 193 | void RS485Class::setPins(int txPin, int dePin, int rePin) 194 | { 195 | _txPin = txPin; 196 | _dePin = dePin; 197 | _rePin = rePin; 198 | } 199 | 200 | void RS485Class::setDelays(int predelay, int postdelay) 201 | { 202 | _predelay = predelay; 203 | _postdelay = postdelay; 204 | } 205 | 206 | #ifdef RS485_SERIAL_PORT 207 | RS485Class RS485(RS485_SERIAL_PORT, RS485_DEFAULT_TX_PIN, RS485_DEFAULT_DE_PIN, RS485_DEFAULT_RE_PIN); 208 | #else 209 | RS485Class RS485(SERIAL_PORT_HARDWARE, RS485_DEFAULT_TX_PIN, RS485_DEFAULT_DE_PIN, RS485_DEFAULT_RE_PIN); 210 | #endif 211 | -------------------------------------------------------------------------------- /src/RS485.h: -------------------------------------------------------------------------------- 1 | /* 2 | This file is part of the ArduinoRS485 library. 3 | Copyright (c) 2018 Arduino SA. All rights reserved. 4 | 5 | This library is free software; you can redistribute it and/or 6 | modify it under the terms of the GNU Lesser General Public 7 | License as published by the Free Software Foundation; either 8 | version 2.1 of the License, or (at your option) any later version. 9 | 10 | This library is distributed in the hope that it will be useful, 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 | Lesser General Public License for more details. 14 | 15 | You should have received a copy of the GNU Lesser General Public 16 | License along with this library; if not, write to the Free Software 17 | Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 18 | */ 19 | 20 | #ifndef _RS485_H_INCLUDED 21 | #define _RS485_H_INCLUDED 22 | 23 | #include 24 | 25 | #ifndef RS485_DEFAULT_TX_PIN 26 | #ifdef PIN_SERIAL1_TX 27 | #define RS485_DEFAULT_TX_PIN PIN_SERIAL1_TX 28 | #else 29 | #define RS485_DEFAULT_TX_PIN 1 30 | #endif 31 | #endif 32 | 33 | #ifdef __AVR__ 34 | #define RS485_DEFAULT_DE_PIN 2 35 | #define RS485_DEFAULT_RE_PIN -1 36 | #elif ARDUINO_NANO_RP2040_CONNECT 37 | #define RS485_DEFAULT_DE_PIN A1 38 | #define RS485_DEFAULT_RE_PIN A0 39 | #elif ARDUINO_SAMD_ZERO 40 | #define RS485_DEFAULT_DE_PIN A4 41 | #define RS485_DEFAULT_RE_PIN A5 42 | #elif defined(ARDUINO_UNOR4_WIFI) || defined(ARDUINO_UNOR4_MINIMA) 43 | #define SERIAL_PORT_HARDWARE Serial1 44 | #define RS485_DEFAULT_DE_PIN 8 45 | #define RS485_DEFAULT_RE_PIN 7 46 | #else 47 | #ifndef RS485_DEFAULT_DE_PIN 48 | #define RS485_DEFAULT_DE_PIN A6 49 | #define RS485_DEFAULT_RE_PIN A5 50 | #endif 51 | #endif 52 | 53 | #ifdef CUSTOM_RS485_DEFAULT_DE_PIN 54 | # define RS485_DEFAULT_DE_PIN CUSTOM_RS485_DEFAULT_DE_PIN 55 | #endif 56 | 57 | #ifdef CUSTOM_RS485_DEFAULT_RE_PIN 58 | # define RS485_DEFAULT_RE_PIN CUSTOM_RS485_DEFAULT_RE_PIN 59 | #endif 60 | 61 | #define RS485_DEFAULT_PRE_DELAY 50 62 | #define RS485_DEFAULT_POST_DELAY 50 63 | 64 | class RS485Class : public Stream { 65 | public: 66 | #ifdef __MBED__ 67 | RS485Class(HardwareSerial& hwSerial, PinName txPin, PinName dePin, PinName rePin); 68 | #endif 69 | RS485Class(HardwareSerial& hwSerial, int txPin, int dePin, int rePin); 70 | 71 | virtual void begin(unsigned long baudrate); 72 | virtual void begin(unsigned long baudrate, uint16_t config); 73 | virtual void begin(unsigned long baudrate, int predelay, int postdelay); 74 | virtual void begin(unsigned long baudrate, uint16_t config, int predelay, int postdelay); 75 | virtual void end(); 76 | virtual int available(); 77 | virtual int peek(); 78 | virtual int read(void); 79 | virtual void flush(); 80 | virtual size_t write(uint8_t b); 81 | using Print::write; // pull in write(str) and write(buf, size) from Print 82 | virtual operator bool(); 83 | 84 | void beginTransmission(); 85 | void endTransmission(); 86 | void receive(); 87 | void noReceive(); 88 | 89 | void sendBreak(unsigned int duration); 90 | void sendBreakMicroseconds(unsigned int duration); 91 | 92 | void setPins(int txPin, int dePin, int rePin); 93 | 94 | void setDelays(int predelay, int postdelay); 95 | 96 | private: 97 | HardwareSerial* _serial; 98 | int _txPin; 99 | int _dePin; 100 | int _rePin; 101 | int _predelay = 0; 102 | int _postdelay = 0; 103 | 104 | bool _transmisionBegun; 105 | unsigned long _baudrate; 106 | uint16_t _config; 107 | }; 108 | 109 | extern RS485Class RS485; 110 | 111 | #endif 112 | --------------------------------------------------------------------------------