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Resolves #93.

The I2C slave address mask should be set to 0 for exact match as described in section 24.6.3.1 of the SAMD21 data sheet, when Address mode of MASK (0x00) is used (table 27-8).

The current value of 0x3ff matches all addresses.

@cmaglie cmaglie merged commit 2a37de9 into arduino:master Feb 18, 2016
@cmaglie cmaglie added this to the Release 1.6.4 milestone Feb 18, 2016
@sandeepmistry sandeepmistry deleted the wire-slave-address-exact-match branch April 19, 2016 15:14
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