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

me-no-dev · 2025-07-08T10:04:20Z

This pull request introduces enhancements to the ESP32 I2C handling by adding new utility functions and improving the TwoWire 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 function i2cBusHandle(uint8_t i2c_num) in esp32-hal-i2c-ng.c to retrieve the bus handle for a given I2C bus number, returning NULL if the number is invalid.
Declared i2cBusHandle(uint8_t i2c_num) in esp32-hal-i2c.h and gated it behind a version check for ESP-IDF 5.4.0 or higher.
Included the esp_idf_version.h header in esp32-hal-i2c.h to enable version-based conditional compilation.

Improvements to `TwoWire` Class:

Modified the TwoWire constructor in Wire.cpp to remove the bitwise operation on the bus number, ensuring the full bus number is stored.
Added a new method getBusNum() to TwoWire in Wire.cpp and declared it in Wire.h, allowing retrieval of the I2C bus number. [1] [2]

github-actions · 2025-07-08T10:04:58Z

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github-actions · 2025-07-08T10:26:53Z

Test Results

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

Results for commit 6300908.

♻️ This comment has been updated with latest results.

github-actions · 2025-07-08T13:16:08Z

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.

Memory	FLASH [bytes]		FLASH [%]		RAM [bytes]		RAM [%]
Target	DEC	INC	DEC	INC	DEC	INC	DEC	INC
ESP32P4	💚 -2	0	0.00	0.00	0	0	0.00	0.00
ESP32S3	💚 -4	0	0.00	0.00	0	0	0.00	0.00
ESP32S2	💚 -4	0	0.00	0.00	0	0	0.00	0.00
ESP32C3	💚 -2	0	0.00	0.00	0	0	0.00	0.00
ESP32C6	💚 -2	0	0.00	0.00	0	0	0.00	0.00
ESP32H2	💚 -2	0	0.00	0.00	0	0	0.00	0.00
ESP32	💚 -4	0	0.00	0.00	0	0	0.00	0.00

Click to expand the detailed deltas report [usage change in BYTES]

Target	ESP32P4		ESP32S3		ESP32S2		ESP32C3		ESP32C6		ESP32H2		ESP32
Example	FLASH	RAM	FLASH	RAM	FLASH	RAM	FLASH	RAM	FLASH	RAM	FLASH	RAM	FLASH	RAM
ArduinoOTA/examples/BasicOTA	0	0	0	0	0	0	0	0	0	0	-	-	0	0
AsyncUDP/examples/AsyncUDPClient	0	0	0	0	0	0	0	0	0	0	-	-	0	0
AsyncUDP/examples/AsyncUDPMulticastServer	0	0	0	0	0	0	0	0	0	0	-	-	0	0
AsyncUDP/examples/AsyncUDPServer	0	0	0	0	0	0	0	0	0	0	-	-	0	0
DNSServer/examples/CaptivePortal	0	0	0	0	0	0	0	0	0	0	-	-	0	0
EEPROM/examples/eeprom_class	0	0	0	0	0	0	0	0	0	0	0	0	0	0
EEPROM/examples/eeprom_extra	0	0	0	0	0	0	0	0	0	0	0	0	0	0
EEPROM/examples/eeprom_write	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ESP32/examples/AnalogOut/LEDCFade	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ESP32/examples/AnalogOut/LEDCGammaFade	0	0	-	-	-	-	-	-	0	0	0	0	-	-
ESP32/examples/AnalogOut/LEDCSingleChannel	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ESP32/examples/AnalogOut/LEDCSoftwareFade	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ESP32/examples/AnalogOut/SigmaDelta	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ESP32/examples/AnalogOut/ledcFrequency	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ESP32/examples/AnalogOut/ledcWrite_RGB	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ESP32/examples/AnalogRead	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ESP32/examples/AnalogReadContinuous	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ESP32/examples/ArduinoStackSize	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ESP32/examples/CI/CIBoardsTest	💚 -2	0	💚 -4	0	💚 -4	0	💚 -2	0	💚 -2	0	💚 -2	0	💚 -4	0
ESP32/examples/ChipID/GetChipID	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ESP32/examples/DeepSleep/TimerWakeUp	0	0	0	0	0	0	0	0	0	0	-	-	0	0
ESP32/examples/DeepSleep/TouchWakeUp	0	0	0	0	0	0	-	-	-	-	-	-	0	0
ESP32/examples/FreeRTOS/BasicMultiThreading	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ESP32/examples/FreeRTOS/Mutex	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ESP32/examples/FreeRTOS/Queue	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ESP32/examples/FreeRTOS/Semaphore	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ESP32/examples/GPIO/BlinkRGB	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ESP32/examples/GPIO/FunctionalInterrupt	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ESP32/examples/GPIO/FunctionalInterruptStruct	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ESP32/examples/GPIO/GPIOInterrupt	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ESP32/examples/HWCDC_Events	0	0	0	0	-	-	0	0	0	0	0	0	-	-
ESP32/examples/MacAddress/GetMacAddress	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ESP32/examples/RMT/Legacy_RMT_Driver_Compatible	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ESP32/examples/RMT/RMTCallback	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ESP32/examples/RMT/RMTLoopback	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ESP32/examples/RMT/RMTReadXJT	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ESP32/examples/RMT/RMTWrite_RGB_LED	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ESP32/examples/RMT/RMT_CPUFreq_Test	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ESP32/examples/RMT/RMT_EndOfTransmissionState	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ESP32/examples/RMT/RMT_LED_Blink	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ESP32/examples/ResetReason/ResetReason	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ESP32/examples/ResetReason/ResetReason2	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ESP32/examples/Serial/BaudRateDetect_Demo	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ESP32/examples/Serial/OnReceiveError_BREAK_Demo	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ESP32/examples/Serial/OnReceive_Demo	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ESP32/examples/Serial/RS485_Echo_Demo	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ESP32/examples/Serial/RxFIFOFull_Demo	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ESP32/examples/Serial/RxTimeout_Demo	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ESP32/examples/Serial/Serial_All_CPU_Freqs	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ESP32/examples/Serial/Serial_STD_Func_OnReceive	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ESP32/examples/Serial/onReceiveExample	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ESP32/examples/TWAI/TWAIreceive	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ESP32/examples/TWAI/TWAItransmit	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ESP32/examples/Template/ExampleTemplate	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ESP32/examples/Time/SimpleTime	0	0	0	0	0	0	0	0	0	0	-	-	0	0
ESP32/examples/Timer/RepeatTimer	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ESP32/examples/Timer/WatchdogTimer	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ESP32/examples/Touch/TouchInterrupt	0	0	0	0	0	0	-	-	-	-	-	-	0	0
ESP32/examples/Touch/TouchRead	0	0	0	0	0	0	-	-	-	-	-	-	0	0
ESP32/examples/Utilities/HEXBuilder	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ESP32/examples/Utilities/MD5Builder	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ESP32/examples/Utilities/SHA1Builder	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ESP_I2S/examples/ES8388_loopback	💚 -2	0	💚 -4	0	💚 -4	0	💚 -2	0	💚 -2	0	💚 -2	0	💚 -4	0
ESP_I2S/examples/Record_to_WAV	0	0	0	0	-	-	-	-	-	-	-	-	0	0
ESP_I2S/examples/Simple_tone	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ESPmDNS/examples/mDNS-SD_Extended	0	0	0	0	0	0	0	0	0	0	-	-	0	0
ESPmDNS/examples/mDNS_Web_Server	0	0	0	0	0	0	0	0	0	0	-	-	0	0
Ethernet/examples/ETH_TLK110	0	0	-	-	-	-	-	-	-	-	-	-	0	0
Ethernet/examples/ETH_W5500_Arduino_SPI	0	0	0	0	0	0	0	0	0	0	0	0	0	0
Ethernet/examples/ETH_W5500_IDF_SPI	0	0	0	0	0	0	0	0	0	0	0	0	0	0
Ethernet/examples/ETH_WIFI_BRIDGE	0	0	0	0	0	0	0	0	0	0	-	-	0	0
FFat/examples/FFat_Test	0	0	0	0	0	0	0	0	0	0	0	0	0	0
FFat/examples/FFat_time	0	0	0	0	0	0	0	0	0	0	-	-	0	0
HTTPClient/examples/Authorization	0	0	0	0	0	0	0	0	0	0	-	-	0	0
HTTPClient/examples/BasicHttpClient	0	0	0	0	0	0	0	0	0	0	-	-	0	0
HTTPClient/examples/BasicHttpsClient	0	0	0	0	0	0	0	0	0	0	-	-	0	0
HTTPClient/examples/ReuseConnection	0	0	0	0	0	0	0	0	0	0	-	-	0	0
HTTPClient/examples/StreamHttpClient	0	0	0	0	0	0	0	0	0	0	-	-	0	0
HTTPUpdate/examples/httpUpdate	0	0	0	0	0	0	0	0	0	0	-	-	0	0
HTTPUpdate/examples/httpUpdateSPIFFS	0	0	0	0	0	0	0	0	0	0	-	-	0	0
HTTPUpdate/examples/httpUpdateSecure	0	0	0	0	0	0	0	0	0	0	-	-	0	0
HTTPUpdateServer/examples/WebUpdater	0	0	0	0	0	0	0	0	0	0	-	-	0	0
LittleFS/examples/LITTLEFS_test	0	0	0	0	0	0	0	0	0	0	0	0	0	0
LittleFS/examples/LITTLEFS_time	0	0	0	0	0	0	0	0	0	0	-	-	0	0
NetBIOS/examples/ESP_NBNST	0	0	0	0	0	0	0	0	0	0	-	-	0	0
NetworkClientSecure/examples/WiFiClientInsecure	0	0	0	0	0	0	0	0	0	0	-	-	0	0
NetworkClientSecure/examples/WiFiClientPSK	0	0	0	0	0	0	0	0	0	0	-	-	0	0
NetworkClientSecure/examples/WiFiClientSecure	0	0	0	0	0	0	0	0	0	0	-	-	0	0
NetworkClientSecure/examples/WiFiClientSecureProtocolUpgrade	0	0	0	0	0	0	0	0	0	0	-	-	0	0
NetworkClientSecure/examples/WiFiClientShowPeerCredentials	0	0	0	0	0	0	0	0	0	0	-	-	0	0
NetworkClientSecure/examples/WiFiClientTrustOnFirstUse	0	0	0	0	0	0	0	0	0	0	-	-	0	0
PPP/examples/PPP_Basic	0	0	0	0	0	0	0	0	0	0	0	0	0	0
PPP/examples/PPP_WIFI_BRIDGE	0	0	0	0	0	0	0	0	0	0	-	-	0	0
Preferences/examples/Prefs2Struct	0	0	0	0	0	0	0	0	0	0	0	0	0	0
Preferences/examples/StartCounter	0	0	0	0	0	0	0	0	0	0	0	0	0	0
SD/examples/SD_Test	0	0	0	0	0	0	0	0	0	0	0	0	0	0
SD/examples/SD_time	0	0	0	0	0	0	0	0	0	0	-	-	0	0
SD_MMC/examples/SD2USBMSC	0	0	0	0	-	-	-	-	-	-	-	-	-	-
SD_MMC/examples/SDMMC_Test	0	0	0	0	-	-	-	-	-	-	-	-	0	0
SD_MMC/examples/SDMMC_time	0	0	0	0	-	-	-	-	-	-	-	-	0	0
SPI/examples/SPI_Multiple_Buses	0	0	0	0	0	0	0	0	0	0	0	0	0	0
SPIFFS/examples/SPIFFS_Test	0	0	0	0	0	0	0	0	0	0	0	0	0	0
SPIFFS/examples/SPIFFS_time	0	0	0	0	0	0	0	0	0	0	-	-	0	0
TFLiteMicro/examples/hello_world	0	0	0	0	0	0	0	0	0	0	0	0	0	0
Ticker/examples/Blinker	0	0	0	0	0	0	0	0	0	0	0	0	0	0
Ticker/examples/TickerBasic	0	0	0	0	0	0	0	0	0	0	0	0	0	0
Ticker/examples/TickerParameter	0	0	0	0	0	0	0	0	0	0	0	0	0	0
USB/examples/CompositeDevice	0	0	0	0	0	0	-	-	-	-	-	-	-	-
USB/examples/ConsumerControl	0	0	0	0	0	0	-	-	-	-	-	-	-	-
USB/examples/CustomHIDDevice	0	0	0	0	0	0	-	-	-	-	-	-	-	-
USB/examples/FirmwareMSC	0	0	0	0	0	0	-	-	-	-	-	-	-	-
USB/examples/Gamepad	0	0	0	0	0	0	-	-	-	-	-	-	-	-
USB/examples/HIDVendor	0	0	0	0	0	0	-	-	-	-	-	-	-	-
USB/examples/Keyboard/KeyboardLogout	0	0	0	0	0	0	-	-	-	-	-	-	-	-
USB/examples/Keyboard/KeyboardMessage	0	0	0	0	0	0	-	-	-	-	-	-	-	-
USB/examples/Keyboard/KeyboardReprogram	0	0	0	0	0	0	-	-	-	-	-	-	-	-
USB/examples/Keyboard/KeyboardSerial	0	0	0	0	0	0	-	-	-	-	-	-	-	-
USB/examples/KeyboardAndMouseControl	0	0	0	0	0	0	-	-	-	-	-	-	-	-
USB/examples/MIDI/MidiController	0	0	0	0	0	0	-	-	-	-	-	-	-	-
USB/examples/MIDI/MidiInterface	0	0	0	0	0	0	-	-	-	-	-	-	-	-
USB/examples/MIDI/MidiMusicBox	0	0	0	0	0	0	-	-	-	-	-	-	-	-
USB/examples/MIDI/ReceiveMidi	0	0	0	0	0	0	-	-	-	-	-	-	-	-
USB/examples/Mouse/ButtonMouseControl	0	0	0	0	0	0	-	-	-	-	-	-	-	-
USB/examples/SystemControl	0	0	0	0	0	0	-	-	-	-	-	-	-	-
USB/examples/USBMSC	0	0	0	0	0	0	-	-	-	-	-	-	-	-
USB/examples/USBSerial	0	0	0	0	0	0	-	-	-	-	-	-	-	-
USB/examples/USBVendor	0	0	0	0	0	0	-	-	-	-	-	-	-	-
Update/examples/AWS_S3_OTA_Update	0	0	0	0	0	0	0	0	0	0	-	-	0	0
Update/examples/HTTPS_OTA_Update	0	0	0	0	0	0	0	0	0	0	-	-	0	0
Update/examples/HTTP_Client_AES_OTA_Update	0	0	0	0	0	0	0	0	0	0	-	-	0	0
Update/examples/HTTP_Server_AES_OTA_Update	0	0	0	0	0	0	0	0	0	0	-	-	0	0
Update/examples/OTAWebUpdater	0	0	0	0	0	0	0	0	0	0	-	-	0	0
Update/examples/SD_Update	0	0	0	0	0	0	0	0	0	0	0	0	0	0
WebServer/examples/AdvancedWebServer	0	0	0	0	0	0	0	0	0	0	-	-	0	0
WebServer/examples/FSBrowser	0	0	0	0	0	0	0	0	0	0	-	-	0	0
WebServer/examples/Filters	0	0	0	0	0	0	0	0	0	0	-	-	0	0
WebServer/examples/HelloServer	0	0	0	0	0	0	0	0	0	0	-	-	0	0
WebServer/examples/HttpAdvancedAuth	0	0	0	0	0	0	0	0	0	0	-	-	0	0
WebServer/examples/HttpAuthCallback	0	0	0	0	0	0	0	0	0	0	-	-	0	0
WebServer/examples/HttpAuthCallbackInline	0	0	0	0	0	0	0	0	0	0	-	-	0	0
WebServer/examples/HttpBasicAuth	0	0	0	0	0	0	0	0	0	0	-	-	0	0
WebServer/examples/HttpBasicAuthSHA1	0	0	0	0	0	0	0	0	0	0	-	-	0	0
WebServer/examples/HttpBasicAuthSHA1orBearerToken	0	0	0	0	0	0	0	0	0	0	-	-	0	0
WebServer/examples/MultiHomedServers	0	0	0	0	0	0	0	0	0	0	-	-	0	0
WebServer/examples/PathArgServer	0	0	0	0	0	0	0	0	0	0	-	-	0	0
WebServer/examples/SDWebServer	0	0	0	0	0	0	0	0	0	0	-	-	0	0
WebServer/examples/SimpleAuthentification	0	0	0	0	0	0	0	0	0	0	-	-	0	0
WebServer/examples/UploadHugeFile	0	0	0	0	0	0	0	0	0	0	-	-	0	0
WebServer/examples/WebServer	0	0	0	0	0	0	0	0	0	0	-	-	0	0
WebServer/examples/WebUpdate	0	0	0	0	0	0	0	0	0	0	-	-	0	0
WiFi/examples/FTM/FTM_Initiator	0	0	0	0	0	0	0	0	0	0	-	-	0	0
WiFi/examples/FTM/FTM_Responder	0	0	0	0	0	0	0	0	0	0	-	-	0	0
WiFi/examples/SimpleWiFiServer	0	0	0	0	0	0	0	0	0	0	-	-	0	0
WiFi/examples/WiFiAccessPoint	0	0	0	0	0	0	0	0	0	0	-	-	0	0
WiFi/examples/WiFiClient	0	0	0	0	0	0	0	0	0	0	-	-	0	0
WiFi/examples/WiFiClientBasic	0	0	0	0	0	0	0	0	0	0	-	-	0	0
WiFi/examples/WiFiClientConnect	0	0	0	0	0	0	0	0	0	0	-	-	0	0
WiFi/examples/WiFiClientEvents	0	0	0	0	0	0	0	0	0	0	-	-	0	0
WiFi/examples/WiFiClientStaticIP	0	0	0	0	0	0	0	0	0	0	-	-	0	0
WiFi/examples/WiFiExtender	0	0	0	0	0	0	0	0	0	0	-	-	0	0
WiFi/examples/WiFiIPv6	0	0	0	0	0	0	0	0	0	0	-	-	0	0
WiFi/examples/WiFiMulti	0	0	0	0	0	0	0	0	0	0	-	-	0	0
WiFi/examples/WiFiMultiAdvanced	0	0	0	0	0	0	0	0	0	0	-	-	0	0
WiFi/examples/WiFiScan	0	0	0	0	0	0	0	0	0	0	-	-	0	0
WiFi/examples/WiFiScanAsync	0	0	0	0	0	0	0	0	0	0	-	-	0	0
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me-no-dev added 2 commits July 8, 2025 13:02

feat(i2c): Add method to access the I2C bus handle

9eb66f3

feat(wire): Add access method to get the I2C bus number

1a240e4

me-no-dev requested a review from a team as a code owner July 8, 2025 10:04

me-no-dev added the Status: Review needed Issue or PR is awaiting review label Jul 8, 2025

P-R-O-C-H-Y approved these changes Jul 8, 2025

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lucasssvaz approved these changes Jul 8, 2025

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me-no-dev added Status: Pending Merge Pull Request is ready to be merged and removed Status: Review needed Issue or PR is awaiting review labels Jul 8, 2025

ci(pre-commit): Apply automatic fixes

6300908

me-no-dev merged commit 2cb6fbc into master Jul 8, 2025
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me-no-dev deleted the feature/i2c_bus_handle branch July 8, 2025 13:18

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

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

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

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

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me-no-dev commented Jul 8, 2025

Enhancements to I2C Utilities:

Improvements to TwoWire Class:

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Memory usage test (comparing PR against master branch)

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Improvements to `TwoWire` Class:

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