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Decoding method and decoding device of FM0 coded data

A technology of encoding data and decoding method, which is applied in the field of decoding method and device of FM0 encoded data, can solve the problems of slow decoding process, inability to decode data, and low decoding rate of high-performance hardware chips, so as to reduce the frequency of data collection, The effect of reducing performance requirements and reducing resource costs

Active Publication Date: 2012-06-27
BEIJING WATCH DATA SYST
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AI Technical Summary

Problems solved by technology

[0011] When decoding FM0 encoded data, most resources of the chip are used to collect data, and only a small part of resources are used to decode, which requires the microcontroller to provide a large buffer area to save the collected data, and at the same time, the data cannot be decoded in real time; Moreover, for FM0 encoded data at 512kbps rate, more expensive chips are required to achieve acquisition and decoding
[0012] Therefore, the frequency of collecting data during the decoding process of the existing FM0 encoded data is relatively fast, that is, the data update is relatively fast, and the performance requirements of the hardware chip are relatively high.
Moreover, only one "1" or half "0" can be determined in one decoding, so the whole decoding process is relatively slow, and the decoding rate of high-performance hardware chips is not high

Method used

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  • Decoding method and decoding device of FM0 coded data
  • Decoding method and decoding device of FM0 coded data
  • Decoding method and decoding device of FM0 coded data

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Embodiment 1

[0035] Embodiment 1. In this embodiment, the timer is in a single-register input capture mode. The single-register input capture mode is an extension of the timer function. There is only one register corresponding to the timer, and one input terminal is set as a rising edge or falling edge detection port. Such as figure 2 The input capture hardware shown, the timer corresponds to the capture register. In this way, the external waveform enters the MCU through CH2 and is internally linked to the edge detector. When CH2 detects the corresponding edge, the value of the timer is automatically saved to the capture register, and the interrupt flag is set, and the timer is cleared on the subsequent edge of the timer. If the timer interrupt is enabled, it will immediately enter the interrupt function for processing.

[0036] In the single-register input capture mode, the rising edge is valid or the falling edge is valid is obtained by configuring the MCU. Therefore, before decoding...

Embodiment 2

[0076] Embodiment 2. In this embodiment, the timer is in a PWM (Pulse Width Modulation, pulse width modulation) input capture mode.

[0077] The PWM input capture mode of the MCU is an extension of different input captures of the timer. The same input terminal is mapped to the two transition edge detection ports of the timer, that is, the timer corresponds to two registers. Such as Figure 7 As shown in the PWM input capture hardware, the external waveform enters the MCU through CH2, and is internally linked to the transition edge detectors of CH1 and CH2. The polarity of the jump edge detectors of CH1 and CH2 is opposite. When the jump edge detector of CH1 detects the corresponding jump edge, the value of the timer is automatically saved in the CC1 register; when CH2 detects the corresponding jump edge, Save the value of the timer to the CC2 register automatically, and set the interrupt flag bit, and clear the timer on the subsequent timer jump edge. If the timer interrupt ...

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Abstract

The invention discloses a decoding method and a decoding device of FM0 coded data, aiming to reduce demand on performances of hardware chips. The method comprises the steps of obtaining to-be-decoded data in a buffer memory area, wherein the to-be-decoded data are obtained by inputting waveforms for capturing and collecting the FM0 coded data by a timer; comparing the to-be-decoded data with threshold values; and determining decoded data according to comparison results.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a method and device for decoding FMO coded data. Background technique [0002] The Electronic Toll Collection system (ETC system) adopts Dedicated Short Range Communication (DSRC) technology to complete the communication between the Roadside Unit (RSU) and the On Board Unit (OBU). Two-way communication, wireless security authentication and consumption deduction, realize non-stop charging, greatly speed up vehicle traffic, reduce congestion at toll ramps, and improve road capacity. [0003] At present, ETC system construction is being carried out all over the country. In order to realize the interconnection of ETC equipment, the RSU and OBU equipment in the ETC system must meet the technical requirements of the national standard GB / T20851-2007. GB / T20851.1-2007 has made clear regulations on the physical layer of this professional short-range communication. In terms of comm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M5/12G07B15/06
Inventor 喻金钱辛伟
Owner BEIJING WATCH DATA SYST
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