tone needs typecast in toggle_count calculation [imported]

This is [Issue 1065](http://code.google.com/p/arduino/issues/detail?id=1065) moved from a Google Code project.
Added by 2012-10-07T14:50:44.000Z by [ElektorEmbedded](http://code.google.com/u/ElektorEmbedded/).
Please review that bug for more context and additional comments, but update this bug.

Original labels: Type-Defect, Priority-Medium
### Original description

**What steps will reproduce the problem?**

call tone(13,32768,100);

**What is the expected output? What do you see instead?**

Expected output: a 100 ms burst of a 32768 Hz square wave.
Real output: nothing.

The reason is an overflow in the calculation of toggle_count in the function tone. Overflow occurs for frequencies > 32767 Hz. Line 339:

```
toggle_count = 2 * frequency * duration / 1000;
```

should be

```
toggle_count = 2 * (long)frequency * duration / 1000;
```

**What version of the Arduino software are you using? On what operating**
**system? Which Arduino board are you using?**

Arduino 1.0.1 on Windows 7 and an Arduino Uno board

Regards,
Clemens