On Wed, Nov 19, 2014 at 3:26 PM, John Mladenik <[email protected]>
wrote:
> I need to be able to send raw data out of the serial port using Bonescript
> command b.serialWrite. I set up an HTML Bonescript to send data and then
> looked on the logic analyzer to see what bit pattern is sent out. The
> pattern is always the ASCII value of the character whether the variable is
> a text or number.
>
> Does anyone know how to pass to b.serialWrite a value so that the UART
> outputs that value?
>
> so I want to have
>
> var port = '/dev/ttyO2'; // set UART port
> var data = 0x55 ;
> b.serialWrite(port, data );
>
> and for the bit pattern coming out of the UART to be 01010101
>
> I tried using String.fromCharCode(data); but this only works for values
> up to 127 (0x7F) since that is all ASCII goes to. This must not support
> extended ASCII?
>
> here is my html/javascript to test this functionality
>
> <html>
> <body>
>
> Uart Byte:<br>
> <input type="number" name="value" id='value'/>
> <button onclick="uartWr()">SEND</button>
>
> </body>
> <head>
> <script src="/bonescript.js"></script>
> <script>
> function uartWr() {
> var b = require('bonescript');
> var port = '/dev/ttyO2'; // set UART port
> var data = document.getElementById('value').value;
> // set baud rate and buffer size
> var options = {
> baudrate: 9600
> };
>
> b.serialWrite(port, data );
>
> }
> </script>
>
> </head>
> </html>
>
I recall BoneScript uses https://github.com/voodootikigod/node-serialport
for serial port interface.
You should be able to send raw binary with b.serialWrite(port, [0x55]);
Data should be a buffer (http://nodejs.org/api/buffer.html).
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