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The expected output when running this example is 0x21,. Please note that this confirms basic I2C functionality but still implementation-dependent bugs (e.g. byte alignment for DMA transfers, maximum buffer size limitations) or even hardware-related issues (e.g. bad ground, capacitive behavior on data lines) can cause a I2C communication fail even if the basic I2C transaction shown in this example works. For correct operation of the NFC device also an interrupt signal is required, but usually validation of the reception of that signal can be done while implementing the SDK's HAL layer.

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