Barcode And QR Code Scanner Reference Design

This design is a sensible instance of utilizing the Atmel SAM4S microcontroller for QR code decoding, demonstrating its capabilities and offering a basis for additional improvement in comparable purposes.

Barcodes are a collection of strains with various widths and spacing that encode info. Whereas 2D techniques utilizing varied symbols are sometimes known as barcodes, the most typical type is the parallel, linear barcode. At present, the EAN/UPC image, which incorporates UPC-A, UPC-E, EAN-13, and EAN-8 barcodes, is the usual for merchandise scanned at retail factors of sale. EAN/UPC barcodes be sure that merchandise are accurately recognized, streamline knowledge assortment, and supply extra correct knowledge for buying and selling companions.

The options of this reference design Atmel SAM4S_WPIR_RD equipment, by Microchip Know-how embody picture processing and decoding for barcodes and QR codes, based mostly on Libdecodeqr and OpenCV, and it helps steady scanning mode. The demo runs on the SAM4S-WPIR_RD Equipment and is powered by way of a USB connector, requiring no extra controls. After profitable decoding, the result’s displayed on the LCD, or an error code is proven if the decoding fails. The first clock supply for the system is the inner quick RC Oscillator, defaulting to 4 MHz. The primary clock supply must be set to an exterior 12 MHz crystal to realize most frequency operation, with PLLB configured because the MCK supply. To configure the microcontroller with these settings, the suitable definition have to be enabled within the Board_lowlevel.c file. This configuration units the clock at 120 MHz. 

The applying features a demo utility for QR code decoding, goals to information customers in using the Atmel SAM4S for this function. Just like different examples for the SAM4S_WPIR_RD, this demo is supplied with an IAR venture and follows an analogous construction. The OpenCV and Libdecodeqr libraries are included in a library format. Upon power-up, the demo shows initialization screens earlier than beginning steady CMOS sensor acquisition. Customers can place an instance QR picture in entrance of the CMOS sensor. Upon profitable detection, this system processes the decode and shows the consequence and related info. The software program includes a number of duties: CMOS sensor picture seize, picture processing, QR decoding, and LCD show.

QR codes, or Fast Response Codes, are a kind of matrix barcode (or two-dimensional barcode) which have gained recognition as a consequence of their quick readability and better storage capability in comparison with customary UPC or EAN barcodes. QR codes encompass black modules organized in a sq. grid on a white background. The data encoded in a QR code may be one in every of 4 standardized kinds of knowledge (numeric, alphanumeric, byte/binary, and Kanji) or by supported extensions.

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Microchip Know-how has examined this reference design, which features a invoice of supplies (BOM), schematics, and extra. Further details about the reference design is accessible on the corporate’s web site. To study extra about this reference design, click on right here.