Hello,
I do not know if you are still working w/ the BaconCape or not but here
goes it:
...
sudo config-pin P9.19 uart
...
If that cmd does not work, please reply. I would like to help and I have
had some ideas w/ past Capes.
Seth
On Thursday, September 27, 2018 at 3:17:36 PM UTC-5, Chris Bohler wrote:
>
> I have set up a Beaglebone Black with the latest Debian download. A
> circuitco Bacon Cape is mounted.
>
> I am attempting to read the 3-axis accelerometer data via i2c (p9_19,20)
> using existing code downloaded from baconcapelabs (see code below):
>
>
>
> var b = require('bonescript'); // Read BoneScript library
>
> var port = '/dev/i2c-2';
>
> var address = 0x1c;
>
> b.i2cOpen(port, address, {}, onI2C); // Open I2C port
>
> b.i2cWriteBytes(port, 0x2a, [0x00]); // Set STANDBY mode
>
> b.i2cWriteBytes(port, 0x0e, [0x00]); // Set scale to 2G
>
> b.i2cWriteBytes(port, 0x2a, [0x01]); // Set ACTIVE mode
>
> setInterval(readA, 200); // Call readA() every 200ms
>
>
>
> function onI2C() {
>
> }
>
>
>
> function readA() {
>
> b.i2cReadBytes(port, 1, 6, onReadBytes);
>
> }
>
>
>
> function onReadBytes(x) {
>
> if(x.event == 'callback') { var X = convertToG(x.res[0]); // First byte
> is X
>
> var Y = convertToG(x.res[2]); // Third byte
> is Y
>
> var Z = convertToG(x.res[4]); // Fifth byte
> is Z
>
> console.log('X: ' + X + ' Y: ' + Y + ' Z: ' + Z);
>
> }
>
> }
>
> 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);
>
> }
>
>
>
> *When I run this javascript code on Cloud9 IDE, I receive the following
> error:*
>
>
>
> /usr/local/lib/node_modules/bonescript/src/iic.js:15
>
> if (m.ports[args.port[0]].path) path = m.ports[args.port[0]].path;
>
> ^
>
>
>
> TypeError: Cannot read property 'path' of undefined
>
> at Object.m.doOpen
> (/usr/local/lib/node_modules/bonescript/src/iic.js:15:30)
>
> at Object.newFunction [as i2cOpen]
> (/usr/local/lib/node_modules/bonescript/src/my.js:451:31)
>
> at Object.<anonymous> (/var/lib/cloud9/examples/BBB_Accelerometer.js:7:3)
>
> at Module._compile (module.js:577:32)
>
> at Object.Module._extensions..js (module.js:586:10)
>
> at Module.load (module.js:494:32)
>
> at tryModuleLoad (module.js:453:12)
>
> at Function.Module._load (module.js:445:3)
>
> at Timeout.Module.runMain [as _onTimeout] (module.js:611:10)
>
> at ontimeout (timers.js:386:11)
>
> at tryOnTimeout (timers.js:250:5)
>
> at Timer.listOnTimeout (timers.js:214:5)
>
>
>
> Changing the i2c channel to i2c-1 allows me to get past this error (had
> seen that bonescript naming scheme different); however, “x.event” is now
> undefined upon function onReadBytes.
>
>
>
> SSH over USB using i2c tools indicates i2c2 acting as expected.
>
>
>
> Any help would be much appreciated.
>
--
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