Hi!
> Okay, this uses the iodelay as the timesource... here is the total
> silliness (and totally untested, of course.)
Why untested? Testing suspend is easy ;-). s2ram from suspend.sf.net
tends to just work...
Pavel
> static inline void io_delay(void)
> {
> outb(0, 0x80);
> }
>
> static void udelay(int loops)
> {
> while (loops--)
> io_delay(); /* Approximately 1 us */
> }
>
> static void beep(unsigned int hz)
> {
> u8 enable;
>
> if (!hz) {
> enable = 0x00; /* Turn off speaker */
> } else {
> u16 div = 1193181/hz;
>
> outb(0xb6, 0x43); /* Ctr 2, squarewave, load, binary */
> io_delay();
> outb(div, 0x42); /* LSB of counter */
> io_delay();
> outb(div >> 8, 0x42); /* MSB of counter */
> io_delay();
>
> enable = 0x03; /* Turn on speaker */
> }
> inb(0x61); /* Dummy read of System Control Port B */
> io_delay();
> outb(enable, 0x61); /* Enable timer 2 output to speaker */
> io_delay();
> }
>
> #define DOT_HZ 880
> #define DASH_HZ 587
> #define US_PER_DOT 125000
>
> /* Okay, this is totally silly, but it's kind of fun. */
> void send_morse(const char *pattern)
> {
> char s;
>
> while ((s = *pattern++)) {
> switch (s) {
> case '.':
> beep(DOT_HZ);
> udelay(US_PER_DOT);
> beep(0);
> udelay(US_PER_DOT);
> break;
> case '-':
> beep(DASH_HZ);
> udelay(US_PER_DOT*3);
> beep(0);
> udelay(US_PER_DOT);
> break;
> default: /* Assume it's a space */
> udelay(US_PER_DOT*3);
> break;
> }
> }
> }
>
>
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures)
http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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