i2c

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This class includes full support for using ESP32 I2C peripheral
Both master and slave modes are supported.

i2c = machine.I2C(id, mode, speed, sda, scl, slave_addr, slave_bufflen)

Argument	Description
`id`	The hardware I2C peripheral ID; `0` or `1` can be used Default: `0`
`mode`	I2C interface mode; master or slave Use the constants `machine.I2C.MASTER` or `machine.I2C.SLAVE` Default: master
`speed` `freq`	I2C clock frequency in Hz Default: 100000
`sda`	I2C sda pin; can be given as integer gpio number or Pin object
`scl`	I2C scl pin; can be given as integer gpio number or Pin object
`slave_address`	I2C slave address to be assigned to this i2c interface. Only used if SLAVE mode is selected Default: 32 (0x20)
`slave_bufflen`	Size of slave buffer used for master<->slave comunication in bytes; Range: 256 - 4096 Default: 256 Only used if SLAVE mode is selected

Only sda and scl are required, all the others are optional and will be set to the default values if not given.

m = machine.I2C(0, sda=21, scl=22)
s = machine.I2C(1, mode=machine.I2C.SLAVE, sda=25, scl=26, slave_bufflen=512)