This is an example of QR code encoding using i.MX28. The encoded QR image can show on the LCD display directly using frame buffer and the image saved as a BMP file.
Board : i.MX28EVK
BSP : L2.6.35_1.1.0_130130_source
QR Code Lib: qrencode-3.4.4.tar.gz
Download from https://fukuchi.org/works/qrencode/
Libqrencode is a C library for encoding data in a QR Code symbol. This library is a free software made by Kentaro Fukuchi.
Build the QR Code Lib source code into rootfs.
1. Create a new folder in <ltib>/dist/lfs-5.1/.
2. Copy the qrencode.spec to this new created folder
3. Build the source code
./ltib –p qrencode.spec –m prep
./ltib –p qrencode.spec –m scbuild
./ltib –p qrencode.spec –m scdeploy
Create and build the application in unit_test:
- I use the existing unit_test package to build my application code.
1. Extract the source code of unit_test
./ltib –p imx-test –m prep
2. cd <ltib>/rpm/BUILD/imx-test-188.8.131.52-1.1.0/test
3. mkdir qr_test
4. copy the Makefile and qr_test.c to qr_test folder
5. Build the unit_test
./ltib –p imx-test –m scbuild
./ltib –p imx-test –m scdeploy
After built the code successfully, the qr_test.out will be generated in the unit_test folder.
I start the board with NFS, so I can run the qr_test.out on the board directly.
The command is :
./qr_test.out (the default QR encode text is “http://www.freescale.com”)
Or input the new text like this :
./qr_test.out –t https://community.freescale.com/community/imx
The QR code show on the display:
And the BMP files will be generated in the unit_test folder.