linux kernel tty driver can you turn off echo by default in the code?
You can turn off echo before the call to tty_set_operations()
with something like the following:
tty_driver->init_termios.c_lflag &= ~ECHO;
Low latency serial communication on Linux
Having talked to to some more engineers about the topic I came to the conclusion that this problem is not solvable in user space. Since we need to cross the bridge into kernel land, we plan to implement an kernel module which talks our protocol and gives us latencies < 1ms.
--- edit ---
Turns out I was completely wrong. All that was necessary was to increase the kernel tick rate. The default 100 ticks added the 10ms delay. 1000Hz and a negative nice value for the serial process gives me the time behavior I wanted to reach.
Create 2d context *without* canvas
It is possible to use a canvas without displaying it on the page. You could do the following:
// Create a canvas element
var canvas = document.createElement('canvas');
canvas.width = 500;
canvas.height = 400;
// Get the drawing context
var ctx = canvas.getContext('2d');
// Then you can do stuff, e.g.:
ctx.fillStyle = '#f00';
ctx.fillRect(20,10,80,50);
Once you've used the canvas, you can of course add it to the document
var element = document.getElementById('canvas_container');
element.appendChild(canvas);
Or you could make an image from it:
var new_image_url = canvas.toDataURL();
var img = document.createElement('img');
img.src = new_image_url;
Or you could access the canvas data as values with:
var image_data = ctx.getImageData(0, 0, canvas.width, canvas.height);
var rgba_byte_array = image_data.data;
rgba_byte_array[0]; // red value for first pixel (top left) in the canvas
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