This mode shares the SPI pins with the controller that reads the program code from flash and is controlled by a hardware arbiter (the flash has always higher priority). This is enabled by calling SPI.pins(6, 7, 8, 0) before the call to SPI.begin(). There’s an extended mode where you can swap the normal pins to the SPI0 hardware pins. Setting the Clock polarity (CPOL) is not supported, yet (SPI_MODE2 and SPI_MODE3 not working). SPI library supports the entire Arduino SPI API including transactions, including setting phase (CPHA). Wire.begin(0, 2) on ESP-01, else they default to pins 4(SDA) and 5(SCL). Before using I2C, pins for SDA and SCL need to be set by calling Wire.begin(int sda, int scl), i.e. Wire library currently supports master mode up to approximately 450KHz. Consider using one of the EEPROM libraries mentioned down below. Note that the sector needs to be re-flashed every time the changed EEPROM data needs to be saved, thus will wear out the flash memory very quickly even if small amounts of data are written. EEPROM.end() will also commit, and will release the RAM copy of EEPROM contents.ĮEPROM library uses one sector of flash located just after the SPIFFS. Size can be anywhere between bytes.ĮEPROM.write does not write to flash immediately, instead you must call mit() whenever you wish to save changes to flash. You need to call EEPROM.begin(size) before you start reading or writing, size being the number of bytes you want to use. This is a bit different from standard EEPROM class. Here is library to simplificate Ticker usage and avoid WDT reset: TickerScheduler EEPROM Instead, set a flag inside the ticker callback and check for that flag inside the loop function. It is currently not recommended to do blocking IO operations (network, serial, file) from Ticker callback functions. Library for calling functions repeatedly with a certain period. Over time the wealth Wi-Fi features ported from ESP8266 SDK to this library outgrew the APIs of WiFi Shield library and it became apparent that we need to provide separate documentation on what is new and extra. Other libraries (not included with the IDE)ĮSP8266WiFi library has been developed basing on ESP8266 SDK, using naming convention and overall functionality philosophy of the Arduino WiFi Shield library.mDNS and DNS-SD responder (ESP8266mDNS library).

Esp8266 wire library