2 Browser Based CRC Calculator Example

Clip out the example code in Figure 2-1 and paste into a text editor. Save the code as a hypertext markup language (.html) file.

Clipping and pasting the text from the figure above can strip out the indents for each line. Add the spaces for easier viewing, but the code runs without the indents.

Using WordPad?, open an empty file and paste the text. Select the File menu and use Save as. Go to Save as type and select All files (*.*). The encoding is UTF-8. Enter a file name (crc.html) and click Save to place the html file in a directory you have chosen. After saving this file on the computer, click on the icon, and the html runs on the default browser. A hex string of ABC123 is the default value. The browser window looks like Figure 2-2 at start up.

To run the calculator, start with the default hex string of ABC123 and click on the Calculate CRC button and the browser returns B5 as the result in Figure 2-3. Both the input and output are in hex, without spaces.

Replace the existing ABC123 hex string to calculate a new value. Use a hex string without non-hex characters. Both upper and lower case characters are accepted. A value of 020026 is selected in the example below. This string is the AFE881H1 write register command to disable CRC. Click on Calculate CRC and a new result appears as in Figure 2-4.

The CRC value 0x24 is calculated from 0x020026. This value is appended to the command to disable the CRC in the AFE881H1 after startup of the device.