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Support for nanosleep and gettimeofday delay methods added

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This commit is contained in:
cstein
2000-07-25 22:12:21 +00:00
parent 0c07dacfea
commit af99913d34
2 changed files with 81 additions and 3 deletions
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server/drivers/hd44780-winamp.c
+21 -3
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@@ -6,6 +6,11 @@
* Copyright (c) 1999 Andrew McMeikan <andrewm@engineer.com>
* modular driver 1999-2000 Benjamin Tse <blt@Comports.com>
*
* Modified July 2000 by Charles Steinkuehler for enhanced
* performance and reduced CPU usage
* - provided required setup time for RS valid to E high
* - 1 uS call to uPause removed as it is unnecessary
*
* The connections are:
* printer port LCD
* D0 (2) D0 (7)
@@ -93,8 +98,21 @@ lcdwinamp_HD44780_senddata (unsigned char displayID, unsigned char flags, unsign
else
dispID = EnMask[displayID - 1];
port_out (lptPort, ch);
port_out (lptPort + 2, (dispID | portControl) ^ OUTMASK);
hd44780_functions->uPause (1);
// 40 nS setup time for RS valid to EN high, so set RS
port_out (lptPort + 2, portControl ^ OUTMASK);
// then set EN high
port_out (lptPort + 2, (dispID | portControl) ^ OUTMASK);
// Output the actual data
port_out (lptPort, ch);
// 80 nS setup from valid data to EN low will be met without any delay
// unless you are running a REALLY FAST ISA bus (like 75 MHZ!)
// 230 nS minimum E high time provided by ISA bus delays as well...
// Set EN low and we're done...
port_out (lptPort + 2, portControl ^ OUTMASK);
// 10 nS data hold time provided by the length of ISA write for EN
}