Elektor Electronics March 2010 by www.elektor.com

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D+3 D2 xl o c c c USB-B 3V6 | 080950 - 12 Figure 1 The socket on the left connects to K5 on the test board. The socl

We have used the familiar v-usb driver t3l and a part of the HlDKeys project [al. As long as our 'keyboard' complies with the HID (Human lnterface Device) specification it will not be necessary to install any driver. Both projects are under CPL. The USB driver essentially consists of two parts; an lnterrupt Service Routine (lSR) and the function usbPoll0, which in the main loop must be called as often as possible, at least every 50 ms. Should it fail to achieve this we get a TimeOut by the host (PC) error and the link stops working.

One USCI process R5232 signal, so signal conversion is necessary. A type 5N65HVD3082E level converter (U9) is used for this purpose. Timer modules A and B of the M5P430F227 4 are used to generate the variable PWM signals that control the constant-current sources U1, U5 and U7. Using software, it is possible to generate up to three PWM signal using only two timer modules (see the 'RCB LED Mood Lighting' article in the February 2008 issue of Elektor). capacitors connected in parallel (C4 and C5) is rated at22ytF.

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