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iriver: Reduced LCD write cycle length to 65ns, almost halving the execution time for lcd_update, from 1.8ms to 1ms in 120MHz

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@7181 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Linus Nielsen Feltzing 2005-07-17 15:59:32 +00:00
parent cd8bfeb8a3
commit 170bb8eb78
1 changed files with 2 additions and 2 deletions
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4
firmware/system.c
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@ -521,7 +521,7 @@ void set_cpu_frequency(long frequency)
PLLCR &= ~1; /* Bypass mode */
PLLCR = 0x11853005;
CSCR0 = 0x00000980; /* Flash: 2 wait state */
CSCR1 = 0x00002580; /* LCD: 9 wait states */
CSCR1 = 0x00000980; /* LCD: 2 wait states */
while(!(PLLCR & 0x80000000)) {}; /* Wait until the PLL has locked.
This may take up to 10ms! */
DCR = (DCR & ~0x01ff) | MAX_REFRESH_TIMER; /* Refresh timer */
@ -540,7 +540,7 @@ void set_cpu_frequency(long frequency)
PLLCR &= ~1; /* Bypass mode */
PLLCR = 0x10886001;
CSCR0 = 0x00000180; /* Flash: 0 wait states */
CSCR1 = 0x00000980; /* LCD: 2 wait states */
CSCR1 = 0x00000180; /* LCD: 0 wait states */
while(!(PLLCR & 0x80000000)) {}; /* Wait until the PLL has locked.
This may take up to 10ms! */
DCR = (DCR & ~0x01ff) | NORMAL_REFRESH_TIMER; /* Refresh timer */