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Add access methods to get the Wire bus number and I2C bus handle#11570

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me-no-dev merged 3 commits intomasterfromfeature/i2c_bus_handle
Jul 8, 2025

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This pull request introduces enhancements to the ESP32 I2C handling by adding new utility functions and improving theTwoWire class. The changes include adding a method to retrieve the I2C bus number, introducing a function to get the bus handle, and ensuring compatibility with specific ESP-IDF versions.

Enhancements to I2C Utilities:

  • Added a new functioni2cBusHandle(uint8_t i2c_num) inesp32-hal-i2c-ng.c to retrieve the bus handle for a given I2C bus number, returningNULL if the number is invalid.
  • Declaredi2cBusHandle(uint8_t i2c_num) inesp32-hal-i2c.h and gated it behind a version check for ESP-IDF 5.4.0 or higher.
  • Included theesp_idf_version.h header inesp32-hal-i2c.h to enable version-based conditional compilation.

Improvements toTwoWire Class:

  • Modified theTwoWire constructor inWire.cpp to remove the bitwise operation on the bus number, ensuring the full bus number is stored.
  • Added a new methodgetBusNum() toTwoWire inWire.cpp and declared it inWire.h, allowing retrieval of the I2C bus number.[1][2]

@me-no-devme-no-dev requested a review froma team as acode ownerJuly 8, 2025 10:04
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@me-no-devme-no-dev added the Status: Review neededIssue or PR is awaiting review labelJul 8, 2025
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Test Results

 76 files   76 suites   13m 10s ⏱️
 38 tests  38 ✅ 0 💤 0 ❌
241 runs  241 ✅ 0 💤 0 ❌

Results for commit6300908.

♻️ This comment has been updated with latest results.

@me-no-devme-no-dev added Status: Pending MergePull Request is ready to be merged and removed Status: Review neededIssue or PR is awaiting review labelsJul 8, 2025
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Memory usage test (comparing PR against master branch)

The table below shows the summary of memory usage change (decrease - increase) in bytes and percentage for each target.

MemoryFLASH [bytes]FLASH [%]RAM [bytes]RAM [%]
TargetDECINCDECINCDECINCDECINC
ESP32P4💚 -200.000.00000.000.00
ESP32S3💚 -400.000.00000.000.00
ESP32S2💚 -400.000.00000.000.00
ESP32C3💚 -200.000.00000.000.00
ESP32C6💚 -200.000.00000.000.00
ESP32H2💚 -200.000.00000.000.00
ESP32💚 -400.000.00000.000.00
Click to expand the detailed deltas report [usage change in BYTES]
TargetESP32P4ESP32S3ESP32S2ESP32C3ESP32C6ESP32H2ESP32
ExampleFLASHRAMFLASHRAMFLASHRAMFLASHRAMFLASHRAMFLASHRAMFLASHRAM
ArduinoOTA/examples/BasicOTA0000000000--00
AsyncUDP/examples/AsyncUDPClient0000000000--00
AsyncUDP/examples/AsyncUDPMulticastServer0000000000--00
AsyncUDP/examples/AsyncUDPServer0000000000--00
DNSServer/examples/CaptivePortal0000000000--00
EEPROM/examples/eeprom_class00000000000000
EEPROM/examples/eeprom_extra00000000000000
EEPROM/examples/eeprom_write00000000000000
ESP32/examples/AnalogOut/LEDCFade00000000000000
ESP32/examples/AnalogOut/LEDCGammaFade00------0000--
ESP32/examples/AnalogOut/LEDCSingleChannel00000000000000
ESP32/examples/AnalogOut/LEDCSoftwareFade00000000000000
ESP32/examples/AnalogOut/SigmaDelta00000000000000
ESP32/examples/AnalogOut/ledcFrequency00000000000000
ESP32/examples/AnalogOut/ledcWrite_RGB00000000000000
ESP32/examples/AnalogRead00000000000000
ESP32/examples/AnalogReadContinuous00000000000000
ESP32/examples/ArduinoStackSize00000000000000
ESP32/examples/CI/CIBoardsTest💚 -20💚 -40💚 -40💚 -20💚 -20💚 -20💚 -40
ESP32/examples/ChipID/GetChipID00000000000000
ESP32/examples/DeepSleep/TimerWakeUp0000000000--00
ESP32/examples/DeepSleep/TouchWakeUp000000------00
ESP32/examples/FreeRTOS/BasicMultiThreading00000000000000
ESP32/examples/FreeRTOS/Mutex00000000000000
ESP32/examples/FreeRTOS/Queue00000000000000
ESP32/examples/FreeRTOS/Semaphore00000000000000
ESP32/examples/GPIO/BlinkRGB00000000000000
ESP32/examples/GPIO/FunctionalInterrupt00000000000000
ESP32/examples/GPIO/FunctionalInterruptStruct00000000000000
ESP32/examples/GPIO/GPIOInterrupt00000000000000
ESP32/examples/HWCDC_Events0000--000000--
ESP32/examples/MacAddress/GetMacAddress00000000000000
ESP32/examples/RMT/Legacy_RMT_Driver_Compatible00000000000000
ESP32/examples/RMT/RMTCallback00000000000000
ESP32/examples/RMT/RMTLoopback00000000000000
ESP32/examples/RMT/RMTReadXJT00000000000000
ESP32/examples/RMT/RMTWrite_RGB_LED00000000000000
ESP32/examples/RMT/RMT_CPUFreq_Test00000000000000
ESP32/examples/RMT/RMT_EndOfTransmissionState00000000000000
ESP32/examples/RMT/RMT_LED_Blink00000000000000
ESP32/examples/ResetReason/ResetReason00000000000000
ESP32/examples/ResetReason/ResetReason200000000000000
ESP32/examples/Serial/BaudRateDetect_Demo00000000000000
ESP32/examples/Serial/OnReceiveError_BREAK_Demo00000000000000
ESP32/examples/Serial/OnReceive_Demo00000000000000
ESP32/examples/Serial/RS485_Echo_Demo00000000000000
ESP32/examples/Serial/RxFIFOFull_Demo00000000000000
ESP32/examples/Serial/RxTimeout_Demo00000000000000
ESP32/examples/Serial/Serial_All_CPU_Freqs00000000000000
ESP32/examples/Serial/Serial_STD_Func_OnReceive00000000000000
ESP32/examples/Serial/onReceiveExample00000000000000
ESP32/examples/TWAI/TWAIreceive00000000000000
ESP32/examples/TWAI/TWAItransmit00000000000000
ESP32/examples/Template/ExampleTemplate00000000000000
ESP32/examples/Time/SimpleTime0000000000--00
ESP32/examples/Timer/RepeatTimer00000000000000
ESP32/examples/Timer/WatchdogTimer00000000000000
ESP32/examples/Touch/TouchInterrupt000000------00
ESP32/examples/Touch/TouchRead000000------00
ESP32/examples/Utilities/HEXBuilder00000000000000
ESP32/examples/Utilities/MD5Builder00000000000000
ESP32/examples/Utilities/SHA1Builder00000000000000
ESP_I2S/examples/ES8388_loopback💚 -20💚 -40💚 -40💚 -20💚 -20💚 -20💚 -40
ESP_I2S/examples/Record_to_WAV0000--------00
ESP_I2S/examples/Simple_tone00000000000000
ESPmDNS/examples/mDNS-SD_Extended0000000000--00
ESPmDNS/examples/mDNS_Web_Server0000000000--00
Ethernet/examples/ETH_TLK11000----------00
Ethernet/examples/ETH_W5500_Arduino_SPI00000000000000
Ethernet/examples/ETH_W5500_IDF_SPI00000000000000
Ethernet/examples/ETH_WIFI_BRIDGE0000000000--00
FFat/examples/FFat_Test00000000000000
FFat/examples/FFat_time0000000000--00
HTTPClient/examples/Authorization0000000000--00
HTTPClient/examples/BasicHttpClient0000000000--00
HTTPClient/examples/BasicHttpsClient0000000000--00
HTTPClient/examples/ReuseConnection0000000000--00
HTTPClient/examples/StreamHttpClient0000000000--00
HTTPUpdate/examples/httpUpdate0000000000--00
HTTPUpdate/examples/httpUpdateSPIFFS0000000000--00
HTTPUpdate/examples/httpUpdateSecure0000000000--00
HTTPUpdateServer/examples/WebUpdater0000000000--00
LittleFS/examples/LITTLEFS_test00000000000000
LittleFS/examples/LITTLEFS_time0000000000--00
NetBIOS/examples/ESP_NBNST0000000000--00
NetworkClientSecure/examples/WiFiClientInsecure0000000000--00
NetworkClientSecure/examples/WiFiClientPSK0000000000--00
NetworkClientSecure/examples/WiFiClientSecure0000000000--00
NetworkClientSecure/examples/WiFiClientSecureProtocolUpgrade0000000000--00
NetworkClientSecure/examples/WiFiClientShowPeerCredentials0000000000--00
NetworkClientSecure/examples/WiFiClientTrustOnFirstUse0000000000--00
PPP/examples/PPP_Basic00000000000000
PPP/examples/PPP_WIFI_BRIDGE0000000000--00
Preferences/examples/Prefs2Struct00000000000000
Preferences/examples/StartCounter00000000000000
SD/examples/SD_Test00000000000000
SD/examples/SD_time0000000000--00
SD_MMC/examples/SD2USBMSC0000----------
SD_MMC/examples/SDMMC_Test0000--------00
SD_MMC/examples/SDMMC_time0000--------00
SPI/examples/SPI_Multiple_Buses00000000000000
SPIFFS/examples/SPIFFS_Test00000000000000
SPIFFS/examples/SPIFFS_time0000000000--00
TFLiteMicro/examples/hello_world00000000000000
Ticker/examples/Blinker00000000000000
Ticker/examples/TickerBasic00000000000000
Ticker/examples/TickerParameter00000000000000
USB/examples/CompositeDevice000000--------
USB/examples/ConsumerControl000000--------
USB/examples/CustomHIDDevice000000--------
USB/examples/FirmwareMSC000000--------
USB/examples/Gamepad000000--------
USB/examples/HIDVendor000000--------
USB/examples/Keyboard/KeyboardLogout000000--------
USB/examples/Keyboard/KeyboardMessage000000--------
USB/examples/Keyboard/KeyboardReprogram000000--------
USB/examples/Keyboard/KeyboardSerial000000--------
USB/examples/KeyboardAndMouseControl000000--------
USB/examples/MIDI/MidiController000000--------
USB/examples/MIDI/MidiInterface000000--------
USB/examples/MIDI/MidiMusicBox000000--------
USB/examples/MIDI/ReceiveMidi000000--------
USB/examples/Mouse/ButtonMouseControl000000--------
USB/examples/SystemControl000000--------
USB/examples/USBMSC000000--------
USB/examples/USBSerial000000--------
USB/examples/USBVendor000000--------
Update/examples/AWS_S3_OTA_Update0000000000--00
Update/examples/HTTPS_OTA_Update0000000000--00
Update/examples/HTTP_Client_AES_OTA_Update0000000000--00
Update/examples/HTTP_Server_AES_OTA_Update0000000000--00
Update/examples/OTAWebUpdater0000000000--00
Update/examples/SD_Update00000000000000
WebServer/examples/AdvancedWebServer0000000000--00
WebServer/examples/FSBrowser0000000000--00
WebServer/examples/Filters0000000000--00
WebServer/examples/HelloServer0000000000--00
WebServer/examples/HttpAdvancedAuth0000000000--00
WebServer/examples/HttpAuthCallback0000000000--00
WebServer/examples/HttpAuthCallbackInline0000000000--00
WebServer/examples/HttpBasicAuth0000000000--00
WebServer/examples/HttpBasicAuthSHA10000000000--00
WebServer/examples/HttpBasicAuthSHA1orBearerToken0000000000--00
WebServer/examples/MultiHomedServers0000000000--00
WebServer/examples/PathArgServer0000000000--00
WebServer/examples/SDWebServer0000000000--00
WebServer/examples/SimpleAuthentification0000000000--00
WebServer/examples/UploadHugeFile0000000000--00
WebServer/examples/WebServer0000000000--00
WebServer/examples/WebUpdate0000000000--00
WiFi/examples/FTM/FTM_Initiator0000000000--00
WiFi/examples/FTM/FTM_Responder0000000000--00
WiFi/examples/SimpleWiFiServer0000000000--00
WiFi/examples/WiFiAccessPoint0000000000--00
WiFi/examples/WiFiClient0000000000--00
WiFi/examples/WiFiClientBasic0000000000--00
WiFi/examples/WiFiClientConnect0000000000--00
WiFi/examples/WiFiClientEvents0000000000--00
WiFi/examples/WiFiClientStaticIP0000000000--00
WiFi/examples/WiFiExtender0000000000--00
WiFi/examples/WiFiIPv60000000000--00
WiFi/examples/WiFiMulti0000000000--00
WiFi/examples/WiFiMultiAdvanced0000000000--00
WiFi/examples/WiFiScan0000000000--00
WiFi/examples/WiFiScanAsync0000000000--00
WiFi/examples/WiFiScanDualAntenna0000000000--00
WiFi/examples/WiFiScanTime0000000000--00
WiFi/examples/WiFiTelnetToSerial0000000000--00
WiFi/examples/WiFiUDPClient0000000000--00
Wire/examples/WireMaster💚 -20💚 -40💚 -40💚 -20💚 -20💚 -20💚 -40
Wire/examples/WireScan💚 -20💚 -40💚 -40💚 -20💚 -20💚 -20💚 -40
Wire/examples/WireSlave💚 -20💚 -40💚 -40💚 -20💚 -20💚 -20💚 -40
BLE/examples/BLE5_extended_scan--00--000000--
BLE/examples/BLE5_multi_advertising--00--000000--
BLE/examples/BLE5_periodic_advertising--00--000000--
BLE/examples/BLE5_periodic_sync--00--000000--
BLE/examples/Beacon_Scanner--00--00000000
BLE/examples/Client--00--00000000
BLE/examples/EddystoneTLM_Beacon--00--00000000
BLE/examples/EddystoneURL_Beacon--00--00000000
BLE/examples/Notify--00--00000000
BLE/examples/Scan--00--00000000
BLE/examples/Server--00--00000000
BLE/examples/Server_multiconnect--00--00000000
BLE/examples/UART--00--00000000
BLE/examples/Write--00--00000000
BLE/examples/iBeacon--00--00000000
ESP32/examples/Camera/CameraWebServer (1)--0000------00
ESP32/examples/Camera/CameraWebServer (2)--0000------00
ESP32/examples/Camera/CameraWebServer (3)--00----------
ESP32/examples/DeepSleep/ExternalWakeUp--0000------00
ESP_NOW/examples/ESP_NOW_Broadcast_Master--00000000--00
ESP_NOW/examples/ESP_NOW_Broadcast_Slave--00000000--00
ESP_NOW/examples/ESP_NOW_Network--00000000--00
ESP_NOW/examples/ESP_NOW_Serial--00000000--00
ESP_SR/examples/Basic--00----------
HTTPClient/examples/HTTPClientEnterprise--💚 -4000💚 -20💚 -20--💚 -40
Insights/examples/DiagnosticsSmokeTest--00000000--00
Insights/examples/MinimalDiagnostics--00000000--00
Matter/examples/MatterColorLight--00000000--00
Matter/examples/MatterCommissionTest--00000000--00
Matter/examples/MatterComposedLights--00000000--00
Matter/examples/MatterContactSensor--00000000--00
Matter/examples/MatterDimmableLight--00000000--00
Matter/examples/MatterEnhancedColorLight--00000000--00
Matter/examples/MatterEvents--00000000--00
Matter/examples/MatterFan--00000000--00
Matter/examples/MatterHumiditySensor--00000000--00
Matter/examples/MatterMinimum--00000000--00
Matter/examples/MatterOccupancySensor--00000000--00
Matter/examples/MatterOnIdentify--00000000--00
Matter/examples/MatterOnOffLight--00000000--00
Matter/examples/MatterOnOffPlugin--00000000--00
Matter/examples/MatterPressureSensor--00000000--00
Matter/examples/MatterSmartButon--00000000--00
Matter/examples/MatterTemperatureLight--00000000--00
Matter/examples/MatterTemperatureSensor--00000000--00
Matter/examples/MatterThermostat--00000000--00
Matter/examples/WiFiProvWithinMatter--00000000--00
NetworkClientSecure/examples/WiFiClientSecureEnterprise--💚 -4000💚 -20💚 -20--💚 -40
RainMaker/examples/RMakerCustom--00000000----
RainMaker/examples/RMakerCustomAirCooler--00000000----
RainMaker/examples/RMakerSonoffDualR3--00000000----
RainMaker/examples/RMakerSwitch--00000000----
SimpleBLE/examples/SimpleBleDevice--00--00000000
WebServer/examples/Middleware--00000000--00
WiFi/examples/WPS--00000000--00
WiFi/examples/WiFiBlueToothSwitch--00--0000--00
WiFi/examples/WiFiClientEnterprise--00000000--00
WiFi/examples/WiFiSmartConfig--00000000--00
WiFiProv/examples/WiFiProv--00000000--00
Zigbee/examples/Zigbee_Analog_Input_Output--000000000000
Zigbee/examples/Zigbee_Color_Dimmer_Switch--000000000000
Zigbee/examples/Zigbee_Electrical_AC_Sensor--000000000000
Zigbee/examples/Zigbee_Electrical_AC_Sensor_MultiPhase--000000000000
Zigbee/examples/Zigbee_Fan_Control--000000000000
Zigbee/examples/Zigbee_Gateway--000000----00
Zigbee/examples/Zigbee_On_Off_Switch--000000000000
Zigbee/examples/Zigbee_Range_Extender--000000000000
Zigbee/examples/Zigbee_Thermostat--000000000000
OpenThread/examples/CLI/COAP/coap_lamp--------0000--
OpenThread/examples/CLI/COAP/coap_switch--------0000--
OpenThread/examples/CLI/SimpleCLI--------0000--
OpenThread/examples/CLI/SimpleNode--------0000--
OpenThread/examples/CLI/SimpleThreadNetwork/ExtendedRouterNode--------0000--
OpenThread/examples/CLI/SimpleThreadNetwork/LeaderNode--------0000--
OpenThread/examples/CLI/SimpleThreadNetwork/RouterNode--------0000--
OpenThread/examples/CLI/ThreadScan--------0000--
OpenThread/examples/CLI/onReceive--------0000--
OpenThread/examples/Native/SimpleThreadNetwork/LeaderNode--------0000--
OpenThread/examples/Native/SimpleThreadNetwork/RouterNode--------0000--
Zigbee/examples/Zigbee_Binary_Input--------0000--
Zigbee/examples/Zigbee_CarbonDioxide_Sensor--------0000--
Zigbee/examples/Zigbee_Color_Dimmable_Light--------0000--
Zigbee/examples/Zigbee_Contact_Switch--------0000--
Zigbee/examples/Zigbee_Dimmable_Light--------0000--
Zigbee/examples/Zigbee_Electrical_DC_Sensor--------0000--
Zigbee/examples/Zigbee_Illuminance_Sensor--------0000--
Zigbee/examples/Zigbee_OTA_Client--------0000--
Zigbee/examples/Zigbee_Occupancy_Sensor--------0000--
Zigbee/examples/Zigbee_On_Off_Light--------0000--
Zigbee/examples/Zigbee_On_Off_MultiSwitch--------0000--
Zigbee/examples/Zigbee_PM25_Sensor--------0000--
Zigbee/examples/Zigbee_Power_Outlet--------0000--
Zigbee/examples/Zigbee_Pressure_Flow_Sensor--------0000--
Zigbee/examples/Zigbee_Scan_Networks--------0000--
Zigbee/examples/Zigbee_Temp_Hum_Sensor_Sleepy--------0000--
Zigbee/examples/Zigbee_Temperature_Sensor--------0000--
Zigbee/examples/Zigbee_Vibration_Sensor--------0000--
Zigbee/examples/Zigbee_Wind_Speed_Sensor--------0000--
Zigbee/examples/Zigbee_Window_Covering--------0000--
BluetoothSerial/examples/DiscoverConnect------------00
BluetoothSerial/examples/GetLocalMAC------------00
BluetoothSerial/examples/SerialToSerialBT------------00
BluetoothSerial/examples/SerialToSerialBTM------------00
BluetoothSerial/examples/SerialToSerialBT_Legacy------------00
BluetoothSerial/examples/SerialToSerialBT_SSP------------00
BluetoothSerial/examples/bt_classic_device_discovery------------00
BluetoothSerial/examples/bt_remove_paired_devices------------00
ESP32/examples/DeepSleep/SmoothBlink_ULP_Code------------00
Ethernet/examples/ETH_LAN8720------------00

@me-no-devme-no-dev merged commit2cb6fbc intomasterJul 8, 2025
57 checks passed
@me-no-devme-no-dev deleted the feature/i2c_bus_handle branchJuly 8, 2025 13:18
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@lucasssvazlucasssvazlucasssvaz approved these changes

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