Reduced GPIO17 (Ethernet clock GPIO) signal strength to reduce noise.

[OlimexSupport]

Hello guys,

Olimex employee here. We received feedback from customers about some noise in Olimex ESP32-GATEWAY design. We did own tests and confirmed there is some noise coming from the GPIO pin we use to feed the clock to the Ethernet. This is GPIO17. It appears all GPIO strength is set to the maximum level 3 - 20mA. Reducing the Ethernet clock GPIO signal strength reduces the noise a lot. There is no benefit for Ethernet clock GPIO to be at max strength for our boards with Ethernet. Reducing the strength of that pin has only benefits for our ESP32-GATEWAY design.

The addition applies only to ESP32-GATEWAY in the folder of its variant we've added a cpp file with GPIO_DRIVE_CAP_0 for GPIO17. Let me know if something is not done properly.

Thanks for your work.

[github-actions]

Warnings

⚠️

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👋 Hello OlimexSupport, we appreciate your contribution to this project!

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[github-actions]

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
ESP32S3	0	0	0.00	0.00	0	0	0.00	0.00
ESP32S2	0	0	0.00	0.00	0	0	0.00	0.00
ESP32C3	0	0	0.00	0.00	0	0	0.00	0.00
ESP32C6	0	0	0.00	0.00	0	0	0.00	0.00
ESP32H2	0	0	0.00	0.00	0	0	0.00	0.00
ESP32	0	0	0.00	0.00	0	0	0.00	0.00

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

Target	ESP32S3		ESP32S2		ESP32C3		ESP32C6		ESP32H2		ESP32
Example	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
AsyncUDP/examples/AsyncUDPClient	0	0	0	0	0	0	0	0	-	-	0	0
AsyncUDP/examples/AsyncUDPMulticastServer	0	0	0	0	0	0	0	0	-	-	0	0
AsyncUDP/examples/AsyncUDPServer	0	0	0	0	0	0	0	0	-	-	0	0
BLE/examples/BLE5_extended_scan	0	0	-	-	0	0	0	0	0	0	-	-
BLE/examples/BLE5_multi_advertising	0	0	-	-	0	0	0	0	0	0	-	-
BLE/examples/BLE5_periodic_advertising	0	0	-	-	0	0	0	0	0	0	-	-
BLE/examples/BLE5_periodic_sync	0	0	-	-	0	0	0	0	0	0	-	-
BLE/examples/Beacon_Scanner	0	0	-	-	0	0	0	0	0	0	0	0
BLE/examples/Client	0	0	-	-	0	0	0	0	0	0	0	0
BLE/examples/EddystoneTLM_Beacon	0	0	-	-	0	0	0	0	-	-	0	0
BLE/examples/EddystoneURL_Beacon	0	0	-	-	0	0	0	0	-	-	0	0
BLE/examples/Notify	0	0	-	-	0	0	0	0	0	0	0	0
BLE/examples/Scan	0	0	-	-	0	0	0	0	0	0	0	0
BLE/examples/Server	0	0	-	-	0	0	0	0	0	0	0	0
BLE/examples/Server_multiconnect	0	0	-	-	0	0	0	0	0	0	0	0
BLE/examples/UART	0	0	-	-	0	0	0	0	0	0	0	0
BLE/examples/Write	0	0	-	-	0	0	0	0	0	0	0	0
BLE/examples/iBeacon	0	0	-	-	0	0	0	0	0	0	0	0
DNSServer/examples/CaptivePortal	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
EEPROM/examples/eeprom_extra	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
ESP32/examples/AnalogOut/LEDCFade	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
ESP32/examples/AnalogOut/SigmaDelta	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
ESP32/examples/AnalogOut/ledcWrite_RGB	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
ESP32/examples/AnalogReadContinuous	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
ESP32/examples/CI/CIBoardsTest	0	0	0	0	0	0	0	0	0	0	0	0
ESP32/examples/Camera/CameraWebServer	0	0	0	0	-	-	-	-	-	-	0	0
ESP32/examples/ChipID/GetChipID	0	0	0	0	0	0	0	0	0	0	0	0
ESP32/examples/DeepSleep/ExternalWakeUp	0	0	0	0	-	-	-	-	-	-	0	0
ESP32/examples/DeepSleep/TimerWakeUp	0	0	0	0	0	0	0	0	-	-	0	0
ESP32/examples/DeepSleep/TouchWakeUp	0	0	0	0	-	-	-	-	-	-	0	0
ESP32/examples/FreeRTOS/BasicMultiThreading	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
ESP32/examples/FreeRTOS/Queue	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
ESP32/examples/GPIO/BlinkRGB	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
ESP32/examples/GPIO/FunctionalInterruptStruct	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
ESP32/examples/HWCDC_Events	0	0	-	-	0	0	0	0	0	0	-	-
ESP32/examples/MacAddress/GetMacAddress	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
ESP32/examples/RMT/RMTLoopback	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
ESP32/examples/RMT/RMTWriteNeoPixel	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
ESP32/examples/RMT/RMT_EndOfTransmissionState	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
ESP32/examples/ResetReason/ResetReason	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
ESP32/examples/Serial/BaudRateDetect_Demo	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
ESP32/examples/Serial/OnReceive_Demo	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
ESP32/examples/Serial/RxFIFOFull_Demo	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
ESP32/examples/Serial/Serial_All_CPU_Freqs	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
ESP32/examples/Serial/onReceiveExample	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
ESP32/examples/TWAI/TWAItransmit	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
ESP32/examples/Time/SimpleTime	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
ESP32/examples/Timer/WatchdogTimer	0	0	0	0	0	0	0	0	0	0	0	0
ESP32/examples/Touch/TouchButtonV2	0	0	0	0	-	-	-	-	-	-	-	-
ESP32/examples/Touch/TouchInterrupt	0	0	0	0	-	-	-	-	-	-	0	0
ESP32/examples/Touch/TouchRead	0	0	0	0	-	-	-	-	-	-	0	0
ESP32/examples/Utilities/HEXBuilder	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
ESP32/examples/Utilities/SHA1Builder	0	0	0	0	0	0	0	0	0	0	0	0
ESP_I2S/examples/ES8388_loopback	0	0	0	0	0	0	0	0	0	0	0	0
ESP_I2S/examples/Record_to_WAV	0	0	-	-	-	-	-	-	-	-	0	0
ESP_I2S/examples/Simple_tone	0	0	0	0	0	0	0	0	0	0	0	0
ESP_NOW/examples/ESP_NOW_Broadcast_Master	0	0	0	0	0	0	0	0	-	-	0	0
ESP_NOW/examples/ESP_NOW_Broadcast_Slave	0	0	0	0	0	0	0	0	-	-	0	0
ESP_NOW/examples/ESP_NOW_Network	0	0	0	0	0	0	0	0	-	-	0	0
ESP_NOW/examples/ESP_NOW_Serial	0	0	0	0	0	0	0	0	-	-	0	0
ESP_SR/examples/Basic	0	0	-	-	-	-	-	-	-	-	-	-
ESPmDNS/examples/mDNS-SD_Extended	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
Ethernet/examples/ETH_W5500_Arduino_SPI	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
FFat/examples/FFat_Test	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
HTTPClient/examples/Authorization	0	0	0	0	0	0	0	0	-	-	0	0
HTTPClient/examples/BasicHttpClient	0	0	0	0	0	0	0	0	-	-	0	0
HTTPClient/examples/BasicHttpsClient	0	0	0	0	0	0	0	0	-	-	0	0
HTTPClient/examples/HTTPClientEnterprise	0	0	0	0	0	0	0	0	-	-	0	0
HTTPClient/examples/ReuseConnection	0	0	0	0	0	0	0	0	-	-	0	0
HTTPClient/examples/StreamHttpClient	0	0	0	0	0	0	0	0	-	-	0	0
HTTPUpdate/examples/httpUpdate	0	0	0	0	0	0	0	0	-	-	0	0
HTTPUpdate/examples/httpUpdateSPIFFS	0	0	0	0	0	0	0	0	-	-	0	0
HTTPUpdate/examples/httpUpdateSecure	0	0	0	0	0	0	0	0	-	-	0	0
HTTPUpdateServer/examples/WebUpdater	0	0	0	0	0	0	0	0	-	-	0	0
Insights/examples/DiagnosticsSmokeTest	0	0	0	0	0	0	-	-	-	-	0	0
Insights/examples/MinimalDiagnostics	0	0	0	0	0	0	-	-	-	-	0	0
LittleFS/examples/LITTLEFS_test	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
NetBIOS/examples/ESP_NBNST	0	0	0	0	0	0	0	0	-	-	0	0
NetworkClientSecure/examples/WiFiClientInsecure	0	0	0	0	0	0	0	0	-	-	0	0
NetworkClientSecure/examples/WiFiClientPSK	0	0	0	0	0	0	0	0	-	-	0	0
NetworkClientSecure/examples/WiFiClientSecure	0	0	0	0	0	0	0	0	-	-	0	0
NetworkClientSecure/examples/WiFiClientSecureEnterprise	0	0	0	0	0	0	0	0	-	-	0	0
NetworkClientSecure/examples/WiFiClientSecureProtocolUpgrade	0	0	0	0	0	0	0	0	-	-	0	0
NetworkClientSecure/examples/WiFiClientShowPeerCredentials	0	0	0	0	0	0	0	0	-	-	0	0
NetworkClientSecure/examples/WiFiClientTrustOnFirstUse	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
Preferences/examples/Prefs2Struct	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
RainMaker/examples/RMakerCustom	0	0	0	0	0	0	-	-	-	-	0	0
RainMaker/examples/RMakerCustomAirCooler	0	0	0	0	0	0	-	-	-	-	0	0
RainMaker/examples/RMakerSonoffDualR3	0	0	0	0	0	0	-	-	-	-	0	0
RainMaker/examples/RMakerSwitch	0	0	0	0	0	0	-	-	-	-	0	0
SD/examples/SD_Test	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
SD_MMC/examples/SDMMC_Test	0	0	-	-	-	-	-	-	-	-	0	0
SD_MMC/examples/SDMMC_time	0	0	-	-	-	-	-	-	-	-	0	0
SPI/examples/SPI_Multiple_Buses	0	0	0	0	-	-	-	-	-	-	0	0
SPIFFS/examples/SPIFFS_Test	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
SimpleBLE/examples/SimpleBleDevice	0	0	-	-	-	-	0	0	0	0	0	0
TFLiteMicro/examples/hello_world	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
Ticker/examples/TickerBasic	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
USB/examples/CompositeDevice	0	0	0	0	-	-	-	-	-	-	-	-
USB/examples/ConsumerControl	0	0	0	0	-	-	-	-	-	-	-	-
USB/examples/CustomHIDDevice	0	0	0	0	-	-	-	-	-	-	-	-
USB/examples/FirmwareMSC	0	0	0	0	-	-	-	-	-	-	-	-
USB/examples/Gamepad	0	0	0	0	-	-	-	-	-	-	-	-
USB/examples/HIDVendor	0	0	0	0	-	-	-	-	-	-	-	-
USB/examples/Keyboard/KeyboardLogout	0	0	0	0	-	-	-	-	-	-	-	-
USB/examples/Keyboard/KeyboardMessage	0	0	0	0	-	-	-	-	-	-	-	-
USB/examples/Keyboard/KeyboardReprogram	0	0	0	0	-	-	-	-	-	-	-	-
USB/examples/Keyboard/KeyboardSerial	0	0	0	0	-	-	-	-	-	-	-	-
USB/examples/KeyboardAndMouseControl	0	0	0	0	-	-	-	-	-	-	-	-
USB/examples/MIDI/MidiController	0	0	0	0	-	-	-	-	-	-	-	-
USB/examples/MIDI/MidiInterface	0	0	0	0	-	-	-	-	-	-	-	-
USB/examples/MIDI/MidiMusicBox	0	0	0	0	-	-	-	-	-	-	-	-
USB/examples/MIDI/ReceiveMidi	0	0	0	0	-	-	-	-	-	-	-	-
USB/examples/Mouse/ButtonMouseControl	0	0	0	0	-	-	-	-	-	-	-	-
USB/examples/SystemControl	0	0	0	0	-	-	-	-	-	-	-	-
USB/examples/USBMSC	0	0	0	0	-	-	-	-	-	-	-	-
USB/examples/USBSerial	0	0	0	0	-	-	-	-	-	-	-	-
USB/examples/USBVendor	0	0	0	0	-	-	-	-	-	-	-	-
Update/examples/AWS_S3_OTA_Update	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
Update/examples/HTTP_Client_AES_OTA_Update	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
Update/examples/OTAWebUpdater	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
WebServer/examples/AdvancedWebServer	0	0	0	0	0	0	0	0	-	-	0	0
WebServer/examples/FSBrowser	0	0	0	0	0	0	0	0	-	-	0	0
WebServer/examples/HelloServer	0	0	0	0	0	0	0	0	-	-	0	0
WebServer/examples/HttpAdvancedAuth	0	0	0	0	0	0	0	0	-	-	0	0
WebServer/examples/HttpAuthCallback	0	0	0	0	0	0	0	0	-	-	0	0
WebServer/examples/HttpAuthCallbackInline	0	0	0	0	0	0	0	0	-	-	0	0
WebServer/examples/HttpBasicAuth	0	0	0	0	0	0	0	0	-	-	0	0
WebServer/examples/HttpBasicAuthSHA1	0	0	0	0	0	0	0	0	-	-	0	0
WebServer/examples/HttpBasicAuthSHA1orBearerToken	0	0	0	0	0	0	0	0	-	-	0	0
WebServer/examples/MultiHomedServers	0	0	0	0	0	0	0	0	-	-	0	0
WebServer/examples/PathArgServer	0	0	0	0	0	0	0	0	-	-	0	0
WebServer/examples/SDWebServer	0	0	0	0	0	0	0	0	-	-	0	0
WebServer/examples/SimpleAuthentification	0	0	0	0	0	0	0	0	-	-	0	0
WebServer/examples/UploadHugeFile	0	0	0	0	0	0	0	0	-	-	0	0
WebServer/examples/WebServer	0	0	0	0	0	0	0	0	-	-	0	0
WebServer/examples/WebUpdate	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
WiFi/examples/FTM/FTM_Responder	0	0	0	0	0	0	0	0	-	-	0	0
WiFi/examples/SimpleWiFiServer	0	0	0	0	0	0	0	0	-	-	0	0
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WiFi/examples/WiFiClientConnect	0	0	0	0	0	0	0	0	-	-	0	0
WiFi/examples/WiFiClientEnterprise	0	0	0	0	0	0	0	0	-	-	0	0
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WiFi/examples/WiFiScan	0	0	0	0	0	0	0	0	-	-	0	0
WiFi/examples/WiFiScanAsync	0	0	0	0	0	0	0	0	-	-	0	0
WiFi/examples/WiFiScanDualAntenna	0	0	0	0	0	0	0	0	-	-	0	0
WiFi/examples/WiFiSmartConfig	0	0	0	0	0	0	0	0	-	-	0	0
WiFi/examples/WiFiTelnetToSerial	0	0	0	0	0	0	0	0	-	-	0	0
WiFi/examples/WiFiUDPClient	0	0	0	0	0	0	0	0	-	-	0	0
WiFiProv/examples/WiFiProv	0	0	0	0	0	0	0	0	-	-	0	0
Wire/examples/WireMaster	0	0	0	0	0	0	0	0	0	0	0	0
Wire/examples/WireScan	0	0	0	0	0	0	0	0	0	0	0	0
Wire/examples/WireSlave	0	0	0	0	0	0	0	0	0	0	0	0
BluetoothSerial/examples/DiscoverConnect	-	-	-	-	-	-	-	-	-	-	0	0
BluetoothSerial/examples/GetLocalMAC	-	-	-	-	-	-	-	-	-	-	0	0
BluetoothSerial/examples/SerialToSerialBT	-	-	-	-	-	-	-	-	-	-	0	0
BluetoothSerial/examples/SerialToSerialBTM	-	-	-	-	-	-	-	-	-	-	0	0
BluetoothSerial/examples/SerialToSerialBT_Legacy	-	-	-	-	-	-	-	-	-	-	0	0
BluetoothSerial/examples/SerialToSerialBT_SSP	-	-	-	-	-	-	-	-	-	-	0	0
BluetoothSerial/examples/bt_classic_device_discovery	-	-	-	-	-	-	-	-	-	-	0	0
BluetoothSerial/examples/bt_remove_paired_devices	-	-	-	-	-	-	-	-	-	-	0	0
ESP32/examples/DeepSleep/SmoothBlink_ULP_Code	-	-	-	-	-	-	-	-	-	-	0	0
ESP32/examples/Touch/TouchButton	-	-	-	-	-	-	-	-	-	-	0	0
Ethernet/examples/ETH_LAN8720	-	-	-	-	-	-	-	-	-	-	0	0
Ethernet/examples/ETH_TLK110	-	-	-	-	-	-	-	-	-	-	0	0