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ebe99f Bob Green 2026-03-19 08:31:29
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# Machine Library
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I've created a library targeting the hardware specific aspects of programming the Sbc-3. I believe that it should work with the other boards from [Mega Micros](https://mega-micros.co.uk/index.htm), but since I don't have access to anything but the Sbc-3, can't confirm that.
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To use the library, just include the following in your C sourcecode:
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```c
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#include <machine.h>
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```
2a20d4 Bob Green 2026-03-21 15:03:23
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## Serial I/O
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## LED Control
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There's a block of 10 leds (LD7 on the SBC3-b3), and six of them can be used for anything you like. Led1 is furthest from the cpu:
d90362 Bob Green 2026-03-21 15:03:37
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2a20d4 Bob Green 2026-03-21 15:03:23
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| LED # | Used for |
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|:------|:---------|
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| 1 | Indicates that the board is being powered via an external 5v supply. |
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| 2 | Indicated that the board is being powered via the ATX power connector. |
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| 3 | Connected to the ~RTS pin on the duart channel B. |
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| 4 | Connected to the ~RTS pin on the duart channel A. |
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| 5 | Available to user. |
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| 6 | Available to user. |
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| 7 | Available to user. |
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| 8 | Available to user. |
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| 9 | Available to user. |
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| 10 | Available to user. |
91e139 Bob Green 2026-03-21 15:06:40
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Two functions are provided, one to turn on a led, and another to turn it off.
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```C
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void set_led(int lednum);
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void clear_led(int lednum);
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```
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Where `lednum` is an integer in the range of 5 through to 10, as per the table above. Any other value will be silently ignored.