Near-field communication modulation depth adaptive method and device
A deep modulation and near-field communication technology, applied in the field of communication, achieves the effects of simple circuit design, improved stability, and shortened debugging time
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Embodiment 1
[0032] Such as figure 1 As shown, a near-field communication modulation depth adaptive method provided in this embodiment includes:
[0033] Step S1: the main control chip of the device writes the value of the first register on the non-contact chip as the first preset value, and the non-contact chip outputs the amplitude according to the value of the first register;
[0034] Specifically in this embodiment, the device includes a main control chip, a non-contact chip and a first storage area.
[0035] Preferably, the first preset value is 0x50 or 0x00.
[0036] Specifically, in this embodiment, modulation depth=the ratio of the difference between the unmodulated amplitude and the modulated amplitude to the sum of the unmodulated amplitude and the modulated amplitude, and the amplitude output in this step is the unmodulated amplitude.
[0037] Step S2: The main control chip of the device sends a measurement amplitude command to the non-contact chip, and the non-contact chip me...
Embodiment 2
[0058] Such as figure 2 As shown, a near-field communication modulation depth adaptive method provided in this embodiment is introduced by taking the application of this method on the reader as an example. The application scenario is that the reader sends data to the card. The method provided in this embodiment The operating subject of the self-adaptive method is a reader-writer, which includes a main control chip, a non-contact chip, a first storage area and an initialization module. The non-contact chip in the present embodiment preferably adopts 3911 chip, and the chip includes a first register, a second register, a third register, a fourth register and a fifth register; the method comprises the following steps:
[0059] Step 101: The reader is powered on and initialized;
[0060] This step is specifically implemented through the initialization module of the reader.
[0061] Specifically in this embodiment, the main body of the operation starting from step 102 is specifi...
Embodiment 3
[0112] Such as image 3 As shown, a near-field communication modulation depth adaptive device provided in this embodiment includes: a main control chip 1, a non-contact chip 2 and a first storage area 3;
[0113] The main control chip 1 includes a judgment module 101, a control module 102, a search module 103, an acquisition module 104, a write module 105 and an operation module 106;
[0114] The control module 102 is used to send a measurement amplitude command to the non-contact chip 2 to control the non-contact chip to measure the current amplitude value, and to control the non-contact chip 2 to output the amplitude according to the value of the first register 201, for Controlling the contactless chip 2 to output an amplitude according to the value of the second register 202 and sending data with the amplitude;
[0115] The judging module 101 is used to judge whether the value closest to the current amplitude value found by the searching module 103 is located in the bounda...
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