Using ElectricImp server.show() and Arduino

Question

I'm following the sparkfun tutorial for connecting an arduino to electric imp. I only have one arduino and imp, so I'm trying to get whatever I type in the arduino serial monitor to display in the imp node using server.show().

I've modified one of the functions in the sparkfun code to look like this:

function pollUart()
{
    imp.wakeup(0.00001, pollUart.bindenv(this));  // schedule the next poll in 10us

    local byte = hardware.uart57.read();  // read the UART buffer
    // This will return -1 if there is no data to be read.

    while (byte != -1) // otherwise, we keep reading until there is no data to be read.
    {
        // server.log(format("%c", byte));  // send the character out to the server log. Optional, great for debugging
        // impeeOutput.set(byte);  // send the valid character out the impee's outputPort

        server.show(byte)
        byte = hardware.uart57.read();  // read from the UART buffer again (not sure if it's a valid character yet)
        toggleTxLED();  // Toggle the TX LED
    }
}

server.show(byte) is only displaying seemingly random numbers. I have an idea of why this is, I just don't know how to fix it because I'm not that familiar with UARTs and squirrel.

local byte = hardware.uart57.read(); reads in the ascii characters from the arduino in byte form (I think), and they're not being 'translated' into their ascii characters before I use server.show(byte). How do I do this in squirrel? Also, I think polling every 10us is the wrong way to go here. I'd like to only poll when there's new information, but I also don't know how to do that in squirrel. Can someone point me to an example where this happens?

Thanks!

Were you able to connect your Electric Imp to Wireless router as i wasn't able to configure Electric Imp with my wifi router. — shailendra, Nov 22 '13 at 06:13

score 1 · Answer 1 · answered Jul 24 '13 at 05:16

I think you are passing the wrong data type to the show method of the server object. The electric imp docs state that it takes a string, server.show(string). I think that local is the correct type to receive the value from hardware.uart57.read(). You can tell from the docs as well. So, you need to find a way to cast your byte to a string. I bet you could find the answer here. From what I read Squirrel use's Unicode so there is a probably a function that takes Unicode bytes and loads them into a string object.

Using ElectricImp server.show() and Arduino

1 Answers1