Wire: fix "Arduino way" I2C scan

[facchinm]

@sievers
Completely fixes #212

Portenta is a bit peculiar and responds correctly to the zero bytes write() but not to the read(); to be investigated.

[github-actions]

Memory usage change @ da21f0e

Board	flash	%	RAM for global variables	%
arduino:mbed:envie_m4	0 - 0	0.0 - 0.0	0 - 0	0.0 - 0.0
arduino:mbed:envie_m7	0 - 0	0.0 - 0.0	0 - 0	0.0 - 0.0
arduino:mbed:nano33ble	0 - 0	0.0 - 0.0	0 - 0	0.0 - 0.0
arduino:mbed:nanorp2040connect	0 - 0	0.0 - 0.0	0 - 0	0.0 - 0.0

Click for full report table

Board	libraries/Scheduler/examples/MultipleBlinks flash	%	libraries/Scheduler/examples/MultipleBlinks RAM for global variables	%	libraries/doom/examples/Doom flash	%	libraries/doom/examples/Doom RAM for global variables	%	libraries/KernelDebug/examples/KernelDebug flash	%	libraries/KernelDebug/examples/KernelDebug RAM for global variables	%	libraries/Portenta_SDCARD/examples/TestSDCARD flash	%	libraries/Portenta_SDCARD/examples/TestSDCARD RAM for global variables	%	libraries/Portenta_Video/examples/Envie_video_coreboot flash	%	libraries/Portenta_Video/examples/Envie_video_coreboot RAM for global variables	%	libraries/RPC/examples/RPC_m4 flash	%	libraries/RPC/examples/RPC_m4 RAM for global variables	%	libraries/RPC/examples/SerialPassthrough_RPC flash	%	libraries/RPC/examples/SerialPassthrough_RPC RAM for global variables	%	libraries/PDM/examples/PDMSerialPlotter flash	%	libraries/PDM/examples/PDMSerialPlotter RAM for global variables	%	libraries/Portenta_Camera/examples/CameraCaptureRawBytes flash	%	libraries/Portenta_Camera/examples/CameraCaptureRawBytes RAM for global variables	%	libraries/Portenta_Camera/examples/CameraMotionDetect flash	%	libraries/Portenta_Camera/examples/CameraMotionDetect RAM for global variables	%	libraries/Portenta_System/examples/PortentaH7_getBootloaderInfo flash	%	libraries/Portenta_System/examples/PortentaH7_getBootloaderInfo RAM for global variables	%	libraries/Portenta_System/examples/PortentaH7_updateBootloader flash	%	libraries/Portenta_System/examples/PortentaH7_updateBootloader RAM for global variables	%	libraries/ThreadDebug/examples/ThreadDebug flash	%	libraries/ThreadDebug/examples/ThreadDebug RAM for global variables	%	libraries/USBHOST/examples/KeyboardController flash	%	libraries/USBHOST/examples/KeyboardController RAM for global variables	%	libraries/USBHOST/examples/Shell flash	%	libraries/USBHOST/examples/Shell RAM for global variables	%	libraries/WiFi/examples/PortentaWiFiFirmwareUpdater flash	%	libraries/WiFi/examples/PortentaWiFiFirmwareUpdater RAM for global variables	%	libraries/WiFi/examples/WiFiWebClient flash	%	libraries/WiFi/examples/WiFiWebClient RAM for global variables	%	/home/runner/Arduino/libraries/WiFiNINA/examples/AP_SimpleWebServer flash	%	/home/runner/Arduino/libraries/WiFiNINA/examples/AP_SimpleWebServer RAM for global variables	%	/home/runner/Arduino/libraries/WiFiNINA/examples/ConnectNoEncryption flash	%	/home/runner/Arduino/libraries/WiFiNINA/examples/ConnectNoEncryption RAM for global variables	%	/home/runner/Arduino/libraries/WiFiNINA/examples/ConnectWithWEP flash	%	/home/runner/Arduino/libraries/WiFiNINA/examples/ConnectWithWEP RAM for global variables	%	/home/runner/Arduino/libraries/WiFiNINA/examples/ConnectWithWPA flash	%	/home/runner/Arduino/libraries/WiFiNINA/examples/ConnectWithWPA RAM for global variables	%	/home/runner/Arduino/libraries/WiFiNINA/examples/ConnectWithWPA2Enterprise flash	%	/home/runner/Arduino/libraries/WiFiNINA/examples/ConnectWithWPA2Enterprise RAM for global variables	%	/home/runner/Arduino/libraries/WiFiNINA/examples/ScanNetworks flash	%	/home/runner/Arduino/libraries/WiFiNINA/examples/ScanNetworks RAM for global variables	%	/home/runner/Arduino/libraries/WiFiNINA/examples/ScanNetworksAdvanced flash	%	/home/runner/Arduino/libraries/WiFiNINA/examples/ScanNetworksAdvanced RAM for global variables	%	/home/runner/Arduino/libraries/WiFiNINA/examples/SimpleWebServerWiFi flash	%	/home/runner/Arduino/libraries/WiFiNINA/examples/SimpleWebServerWiFi RAM for global variables	%	/home/runner/Arduino/libraries/WiFiNINA/examples/Tools/CheckFirmwareVersion flash	%	/home/runner/Arduino/libraries/WiFiNINA/examples/Tools/CheckFirmwareVersion RAM for global variables	%	/home/runner/Arduino/libraries/WiFiNINA/examples/Tools/FirmwareUpdater flash	%	/home/runner/Arduino/libraries/WiFiNINA/examples/Tools/FirmwareUpdater RAM for global variables	%	/home/runner/Arduino/libraries/WiFiNINA/examples/Tools/SerialNINAPassthrough flash	%	/home/runner/Arduino/libraries/WiFiNINA/examples/Tools/SerialNINAPassthrough RAM for global variables	%	/home/runner/Arduino/libraries/WiFiNINA/examples/WiFiChatServer flash	%	/home/runner/Arduino/libraries/WiFiNINA/examples/WiFiChatServer RAM for global variables	%	/home/runner/Arduino/libraries/WiFiNINA/examples/WiFiPing flash	%	/home/runner/Arduino/libraries/WiFiNINA/examples/WiFiPing RAM for global variables	%	/home/runner/Arduino/libraries/WiFiNINA/examples/WiFiSSLClient flash	%	/home/runner/Arduino/libraries/WiFiNINA/examples/WiFiSSLClient RAM for global variables	%	/home/runner/Arduino/libraries/WiFiNINA/examples/WiFiStorage flash	%	/home/runner/Arduino/libraries/WiFiNINA/examples/WiFiStorage RAM for global variables	%	/home/runner/Arduino/libraries/WiFiNINA/examples/WiFiUdpNtpClient flash	%	/home/runner/Arduino/libraries/WiFiNINA/examples/WiFiUdpNtpClient RAM for global variables	%	/home/runner/Arduino/libraries/WiFiNINA/examples/WiFiUdpSendReceiveString flash	%	/home/runner/Arduino/libraries/WiFiNINA/examples/WiFiUdpSendReceiveString RAM for global variables	%	/home/runner/Arduino/libraries/WiFiNINA/examples/WiFiWebClient flash	%	/home/runner/Arduino/libraries/WiFiNINA/examples/WiFiWebClient RAM for global variables	%	/home/runner/Arduino/libraries/WiFiNINA/examples/WiFiWebClientRepeating flash	%	/home/runner/Arduino/libraries/WiFiNINA/examples/WiFiWebClientRepeating RAM for global variables	%	/home/runner/Arduino/libraries/WiFiNINA/examples/WiFiWebServer flash	%	/home/runner/Arduino/libraries/WiFiNINA/examples/WiFiWebServer RAM for global variables	%
arduino:mbed:envie_m4	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0
arduino:mbed:envie_m7	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0
arduino:mbed:nano33ble	0	0.0	0	0.0																									0	0.0	0	0.0																	0	0.0	0	0.0
arduino:mbed:nanorp2040connect	0	0.0	0	0.0																									0	0.0	0	0.0																																					0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0

Click for full report CSV

Board,libraries/Scheduler/examples/MultipleBlinks<br>flash,%,libraries/Scheduler/examples/MultipleBlinks<br>RAM for global variables,%,libraries/doom/examples/Doom<br>flash,%,libraries/doom/examples/Doom<br>RAM for global variables,%,libraries/KernelDebug/examples/KernelDebug<br>flash,%,libraries/KernelDebug/examples/KernelDebug<br>RAM for global variables,%,libraries/Portenta_SDCARD/examples/TestSDCARD<br>flash,%,libraries/Portenta_SDCARD/examples/TestSDCARD<br>RAM for global variables,%,libraries/Portenta_Video/examples/Envie_video_coreboot<br>flash,%,libraries/Portenta_Video/examples/Envie_video_coreboot<br>RAM for global variables,%,libraries/RPC/examples/RPC_m4<br>flash,%,libraries/RPC/examples/RPC_m4<br>RAM for global variables,%,libraries/RPC/examples/SerialPassthrough_RPC<br>flash,%,libraries/RPC/examples/SerialPassthrough_RPC<br>RAM for global variables,%,libraries/PDM/examples/PDMSerialPlotter<br>flash,%,libraries/PDM/examples/PDMSerialPlotter<br>RAM for global variables,%,libraries/Portenta_Camera/examples/CameraCaptureRawBytes<br>flash,%,libraries/Portenta_Camera/examples/CameraCaptureRawBytes<br>RAM for global variables,%,libraries/Portenta_Camera/examples/CameraMotionDetect<br>flash,%,libraries/Portenta_Camera/examples/CameraMotionDetect<br>RAM for global variables,%,libraries/Portenta_System/examples/PortentaH7_getBootloaderInfo<br>flash,%,libraries/Portenta_System/examples/PortentaH7_getBootloaderInfo<br>RAM for global variables,%,libraries/Portenta_System/examples/PortentaH7_updateBootloader<br>flash,%,libraries/Portenta_System/examples/PortentaH7_updateBootloader<br>RAM for global variables,%,libraries/ThreadDebug/examples/ThreadDebug<br>flash,%,libraries/ThreadDebug/examples/ThreadDebug<br>RAM for global variables,%,libraries/USBHOST/examples/KeyboardController<br>flash,%,libraries/USBHOST/examples/KeyboardController<br>RAM for global variables,%,libraries/USBHOST/examples/Shell<br>flash,%,libraries/USBHOST/examples/Shell<br>RAM for global variables,%,libraries/WiFi/examples/PortentaWiFiFirmwareUpdater<br>flash,%,libraries/WiFi/examples/PortentaWiFiFirmwareUpdater<br>RAM for global variables,%,libraries/WiFi/examples/WiFiWebClient<br>flash,%,libraries/WiFi/examples/WiFiWebClient<br>RAM for global variables,%,/home/runner/Arduino/libraries/WiFiNINA/examples/AP_SimpleWebServer<br>flash,%,/home/runner/Arduino/libraries/WiFiNINA/examples/AP_SimpleWebServer<br>RAM for global variables,%,/home/runner/Arduino/libraries/WiFiNINA/examples/ConnectNoEncryption<br>flash,%,/home/runner/Arduino/libraries/WiFiNINA/examples/ConnectNoEncryption<br>RAM for global variables,%,/home/runner/Arduino/libraries/WiFiNINA/examples/ConnectWithWEP<br>flash,%,/home/runner/Arduino/libraries/WiFiNINA/examples/ConnectWithWEP<br>RAM for global variables,%,/home/runner/Arduino/libraries/WiFiNINA/examples/ConnectWithWPA<br>flash,%,/home/runner/Arduino/libraries/WiFiNINA/examples/ConnectWithWPA<br>RAM for global variables,%,/home/runner/Arduino/libraries/WiFiNINA/examples/ConnectWithWPA2Enterprise<br>flash,%,/home/runner/Arduino/libraries/WiFiNINA/examples/ConnectWithWPA2Enterprise<br>RAM for global variables,%,/home/runner/Arduino/libraries/WiFiNINA/examples/ScanNetworks<br>flash,%,/home/runner/Arduino/libraries/WiFiNINA/examples/ScanNetworks<br>RAM for global variables,%,/home/runner/Arduino/libraries/WiFiNINA/examples/ScanNetworksAdvanced<br>flash,%,/home/runner/Arduino/libraries/WiFiNINA/examples/ScanNetworksAdvanced<br>RAM for global variables,%,/home/runner/Arduino/libraries/WiFiNINA/examples/SimpleWebServerWiFi<br>flash,%,/home/runner/Arduino/libraries/WiFiNINA/examples/SimpleWebServerWiFi<br>RAM for global variables,%,/home/runner/Arduino/libraries/WiFiNINA/examples/Tools/CheckFirmwareVersion<br>flash,%,/home/runner/Arduino/libraries/WiFiNINA/examples/Tools/CheckFirmwareVersion<br>RAM for global variables,%,/home/runner/Arduino/libraries/WiFiNINA/examples/Tools/FirmwareUpdater<br>flash,%,/home/runner/Arduino/libraries/WiFiNINA/examples/Tools/FirmwareUpdater<br>RAM for global variables,%,/home/runner/Arduino/libraries/WiFiNINA/examples/Tools/SerialNINAPassthrough<br>flash,%,/home/runner/Arduino/libraries/WiFiNINA/examples/Tools/SerialNINAPassthrough<br>RAM for global variables,%,/home/runner/Arduino/libraries/WiFiNINA/examples/WiFiChatServer<br>flash,%,/home/runner/Arduino/libraries/WiFiNINA/examples/WiFiChatServer<br>RAM for global variables,%,/home/runner/Arduino/libraries/WiFiNINA/examples/WiFiPing<br>flash,%,/home/runner/Arduino/libraries/WiFiNINA/examples/WiFiPing<br>RAM for global variables,%,/home/runner/Arduino/libraries/WiFiNINA/examples/WiFiSSLClient<br>flash,%,/home/runner/Arduino/libraries/WiFiNINA/examples/WiFiSSLClient<br>RAM for global variables,%,/home/runner/Arduino/libraries/WiFiNINA/examples/WiFiStorage<br>flash,%,/home/runner/Arduino/libraries/WiFiNINA/examples/WiFiStorage<br>RAM for global variables,%,/home/runner/Arduino/libraries/WiFiNINA/examples/WiFiUdpNtpClient<br>flash,%,/home/runner/Arduino/libraries/WiFiNINA/examples/WiFiUdpNtpClient<br>RAM for global variables,%,/home/runner/Arduino/libraries/WiFiNINA/examples/WiFiUdpSendReceiveString<br>flash,%,/home/runner/Arduino/libraries/WiFiNINA/examples/WiFiUdpSendReceiveString<br>RAM for global variables,%,/home/runner/Arduino/libraries/WiFiNINA/examples/WiFiWebClient<br>flash,%,/home/runner/Arduino/libraries/WiFiNINA/examples/WiFiWebClient<br>RAM for global variables,%,/home/runner/Arduino/libraries/WiFiNINA/examples/WiFiWebClientRepeating<br>flash,%,/home/runner/Arduino/libraries/WiFiNINA/examples/WiFiWebClientRepeating<br>RAM for global variables,%,/home/runner/Arduino/libraries/WiFiNINA/examples/WiFiWebServer<br>flash,%,/home/runner/Arduino/libraries/WiFiNINA/examples/WiFiWebServer<br>RAM for global variables,%
arduino:mbed:envie_m4,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0
arduino:mbed:envie_m7,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0
arduino:mbed:nano33ble,0,0.0,0,0.0,,,,,,,,,,,,,,,,,,,,,,,,,0,0.0,0,0.0,,,,,,,,,,,,,,,,,0,0.0,0,0.0,,,,,,,,,,,,,,,,
arduino:mbed:nanorp2040connect,0,0.0,0,0.0,,,,,,,,,,,,,,,,,,,,,,,,,0,0.0,0,0.0,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0

[pennam]

Tested on 3a2a248 with 2 connected devices (LM75B and AT24CXX) read works fine also on Portenta. I think we could remove conditional compilation directives.

[fsievers]

I checked the changes on my Pi Pico and can confirm, that the I2C scan is now working as expected.