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Speed up C200 lcd_update() by ~7%.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@14834 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jens Arnold 2007-09-23 19:15:01 +00:00
parent a33fc5dbbe
commit bf169ed7db
1 changed files with 3 additions and 14 deletions
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17
firmware/target/arm/sandisk/sansa-c200/lcd-c200.c
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@ -28,28 +28,17 @@
#define LCD_BUSY 0x8000
/* check if number of useconds has past */
static inline bool timer_check(int clock_start, int usecs)
{
return ((int)(USEC_TIMER - clock_start)) >= usecs;
}
/* wait for LCD with timeout */
/* wait for LCD */
static inline void lcd_wait_write(void)
{
int start = USEC_TIMER;
do {
if ((LCD_BASE & LCD_BUSY) == 0)
break;
} while (timer_check(start, 1000) == 0);
while (LCD_BASE & LCD_BUSY);
}
/* send LCD data */
static void lcd_send_data(unsigned data)
{
lcd_wait_write();
LCD_DATA = (data >> 8) & 0xff;
LCD_DATA = data >> 8;
lcd_wait_write();
LCD_DATA = data & 0xff;