On Thu, Mar 27, 2014 at 4:17 PM, Mark A. Yoder <mark.a.yo...@gmail.com> wrote:
> Hmm... I'm not getting anywhere with this. I have a TMP101 i2c device wired
> to P9_19 and P9_20. From the command line this works:
>
> # i2cdetect -y -r 1
> 0 1 2 3 4 5 6 7 8 9 a b c d e f
> 00: -- -- -- -- -- -- -- -- -- -- -- -- --
> 10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
> 20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
> 30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
> 40: -- -- -- -- -- -- -- -- -- 49 -- -- -- -- -- --
> 50: -- -- -- -- UU UU UU UU -- -- -- -- -- -- -- --
> 60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
> 70: 70 -- -- -- -- -- -- --
> # i2cget -y 1 0x49
> 0x17
> # i2cget -y 1 0x49
> 0x1b
> I stuck my figure on the device and warmed it up for the second i2cget.
>
> Now with bonescript:
> var b = require('bonescript');
> var port = '/dev/i2c-0'
> var TMP102 = 0x48;
>
> b.i2cOpen(port, TMP102, {}, onI2C);
>
> function onI2C(x) {
> // console.log(x);
> if (x.event == 'return') {
> b.i2cScan(port, onScan);
> b.i2cReadBytes(port, 0, 1, onReadByte);
> }
> }
>
> function onScan(x) {
> console.log('scan data: ' + x.data);
> }
>
> function onReadByte(x) {
> console.log('onReadByte: ' + JSON.stringify(x));
> console.log('res: ' + JSON.stringify(x.res));
> }
> When I run with /dev/i2c-1 I get:
>
> scan data:
> scan data: undefined
> onReadByte: {"err":{},"res":[240],"event":"callback"}
> res: [240]
> onReadByte: {"event":"return","return":[240]}
> res: undefined
>
> That is, scan doesn't find anything. If I run with /dev/i2c-0
>
> scan data: 52,80
> scan data: undefined
> onReadByte: {"err":{},"res":[240],"event":"callback"}
> res: [240]
> onReadByte: {"event":"return","return":[240]}
> res: undefined
>
> Scan finds two devices, but I don't see how they relate to whats on the bus.
>
> Any ideas?
You'll want to use '/dev/i2c-2'.
Check out https://github.com/jadonk/bonescript/blob/master/src/bone.js#L1550
for the mapping.
The reason I chose to use i2c-2 because the adapters are enumerated
out of order. Otherwise, it won't match the hardware documentation.
(http://beagleboard.org/support/bone101/#headers-i2c)
There has been some discussion to fix this in mainline, but I'm not
sure of the current state.
http://lists.infradead.org/pipermail/linux-arm-kernel/2012-August/116775.html
>
> --Mark
>
> On Thursday, March 27, 2014 9:40:09 AM UTC-4, Jason Kridner wrote:
>>
>> On Wed, Mar 26, 2014 at 5:42 PM, Mark A. Yoder <mark.a...@gmail.com>
>> wrote:
>> > I see the bonescript has some i2c methods. Are there any examples out
>> > there
>> > that work under Debian on the Black Bone?
>>
>> Here's one that works on BoneScript 0.2.4 on Debian, but happens to be
>> calling the I2C methods from a web page:
>>
>> http://jsfiddle.net/jkridner/PGL92/ [1]
>>
>> I had something similar for drawing a Flot graph using the
>> accelerometer, but not sure where I posted it.
>>
>> Some more running-from-webpage examples:
>> http://jsfiddle.net/user/jkridner/fiddles/
>>
>> [1] source
>> var canvas = document.getElementById("mysketch");
>> var p = new Processing(canvas, sketchProc);
>>
>> function sketchProc(pjs) {
>> // Sketch global variables
>> var radius = 50.0;
>> var X, Y;
>> var nX, nY;
>> var delay = 16;
>> var brightness = 0;
>> var buttonStatus = 0;
>> var sliderStatus = 0;
>> var lastSliderValue = 0;
>> var BUTTON = 'P8_19';
>> var SLIDER = 'P9_36';
>> var port = '/dev/i2c-2'
>> var address = 0x1c;
>>
>> // Get the BoneScript library and begin updating the canvas
>> setTargetAddress('192.168.7.2', {
>> initialized: run
>> });
>>
>> function run() {
>> var b = require('bonescript');
>> b.pinMode(BUTTON, b.INPUT);
>> b.i2cOpen(port, address, {}, onI2C);
>>
>> // Setup the Processing Canvas
>> pjs.setup = function () {
>> pjs.size(256, 256);
>> pjs.strokeWeight(10);
>> pjs.frameRate(15);
>> X = pjs.width / 2;
>> Y = pjs.height / 2;
>> nX = X;
>> nY = Y;
>> }
>>
>> // Main draw loop
>> pjs.draw = function () {
>> // Calculate some fading values based on the frame count
>> radius = 50.0 + (15 - sliderStatus) * pjs.sin(pjs.frameCount /
>> 4);
>> brightness = (radius - 40.0) / 20.0;
>>
>> // Track circle to new destination
>> X += (nX - X) / delay;
>> Y += (nY - Y) / delay;
>>
>> // Fill canvas grey
>> pjs.background(100);
>>
>> // Set fill-color to blue or red, based on button status
>> if (buttonStatus) pjs.fill(200, 30, 20)
>> else pjs.fill(0, 121, 184);
>>
>> // Set stroke-color white
>> pjs.stroke(255);
>>
>> // Draw circle
>> pjs.ellipse(X, Y, radius, radius);
>>
>> // Update physical values
>> readSlider();
>> }
>>
>> function readSlider() {
>> b.analogRead(SLIDER, onAnalogRead);
>> }
>>
>> // Handle data back from potentiometer
>> function onAnalogRead(x) {
>> if (!x.err && (x.value >= 0) && (x.value <= 1)) {
>> if (Math.abs(x.value - lastSliderValue) > 0.05) {
>> lastSliderValue = x.value;
>> sliderStatus = parseInt(x.value * 10, 10);
>> }
>> }
>>
>> // Fetch button status
>> b.digitalRead(BUTTON, onDigitalRead);
>>
>> }
>>
>> // Handle data back from button
>> function onDigitalRead(x) {
>> buttonStatus = (x.value == b.LOW) ? 1 : 0;
>>
>> // Fetch accelerometer status
>> readAccel();
>> }
>>
>> function onI2C(x) {
>> if (x.event == 'return') {
>> b.i2cWriteBytes(port, 0x2a, [0x00], onI2C_A);
>> }
>> }
>>
>> function onI2C_A() {
>> b.i2cWriteBytes(port, 0x0e, [0x00], onI2C_B);
>> }
>>
>> function onI2C_B() {
>> b.i2cWriteBytes(port, 0x2a, [0x01], pjs.setup);
>> }
>>
>> // Fetch accelerometer status
>> function readAccel() {
>> b.i2cReadBytes(port, 1, 6, onReadBytes);
>> }
>>
>> function onReadBytes(x) {
>> console.log(JSON.stringify(x));
>> if (x.event == 'callback') {
>> var gX = convertToG(x.res[0]);
>> var gY = convertToG(x.res[2]);
>> var gZ = convertToG(x.res[4]);
>> $('#X').html(gX);
>> $('#Y').html(gY);
>> $('#Z').html(gZ);
>>
>> // Update heading of ball
>> nX = 128 - (gX / 2) * 256;
>> nY = (gY / 2) * 256 + 128;
>>
>> //pjs.draw();
>> }
>> }
>>
>> function convertToG(x) {
>> if (x >= 128) x = -((x ^ 0xFF) + 1); // Get two's complement
>> x = x / 64; // Scale to G
>> x = x.toFixed(2); // Limit decimal places
>> return (x);
>> }
>> }
>> }
>>
>> >
>> > --Mark
>> >
>> > --
>> > For more options, visit http://beagleboard.org/discuss
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>
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