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H1x0: Assembler optimised remote lcd driver routine, used for low CPU frequencies, e.g. during radio operation. Reduces the scroll lag when using the radio preset list with the remote plugged.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@7791 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jens Arnold 2005-11-08 22:46:31 +00:00
parent 64c4f19811
commit 6da4e33aac
1 changed files with 133 additions and 19 deletions
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152
firmware/drivers/lcd-h100-remote.c
View file

@ -126,7 +126,7 @@ void lcd_remote_write_command(int cmd)
RS_LO;
CS_LO;
for (i = 0; i < 8; i++)
for (i = 8; i > 0; i--)
{
if (cmd & 0x80)
DATA_HI;
@ -150,37 +150,151 @@ void lcd_remote_write_data(const unsigned char* p_bytes, int count)
RS_HI;
CS_LO;
for (i = 0; i < count; i++)
/* This is safe as long as lcd_remote_write_data() isn't called from within
* an ISR. */
if (cpu_frequency > 20000000)
{
data = p_bytes[i];
for (j = 0; j < 8; j++)
for (i = count; i > 0; i--)
{
if (data & 0x80)
DATA_HI;
else
DATA_LO;
data = *p_bytes++;
for (j = 8; j > 0; j--)
{
if (data & 0x80)
DATA_HI;
else
DATA_LO;
CLK_HI;
data <<= 1;
DELAY;
CLK_HI;
data <<= 1;
DELAY;
CLK_LO;
CLK_LO;
}
}
}
else
{
for (i = count; i > 0; i--)
{
asm (
"move.w %%sr,%%d4 \n" /* get current interrupt level */
"move.w #0x2700,%%sr \n" /* disable interrupts */
"move.l #0x00040000,%%d1\n" /* precalculate port values */
"move.l %%d1,%%d0 \n" /* for setting and resetting */
"or.l (%[gpi1]),%%d1 \n" /* the data bit */
"eor.l %%d1,%%d0 \n"
"move.l #0x10000000,%%d3\n" /* precalculate port values */
"move.l %%d3,%%d2 \n" /* for setting and resetting */
"or.l (%[gpio]),%%d3 \n" /* the clock bit */
"eor.l %%d3,%%d2 \n"
"tst.b %[data] \n" /* MSB of data set? */
"bmi.s 1f \n"
"move.l %%d0,(%[gpi1]) \n" /* reset data bit */
".word 0x51fa \n" /* trapf.w - shadow next insn */
"1: \n"
"move.l %%d1,(%[gpi1]) \n" /* set data bit */
"move.l %%d3,(%[gpio]) \n" /* set clock bit */
"lsl.l #1,%[data] \n" /* data <<= 1 */
"move.l %%d2,(%[gpio]) \n" /* reset clock bit */
"tst.b %[data] \n"
"bmi.s 1f \n"
"move.l %%d0,(%[gpi1]) \n"
".word 0x51fa \n"
"1: \n"
"move.l %%d1,(%[gpi1]) \n"
"move.l %%d3,(%[gpio]) \n"
"lsl.l #1,%[data] \n"
"move.l %%d2,(%[gpio]) \n"
"tst.b %[data] \n"
"bmi.s 1f \n"
"move.l %%d0,(%[gpi1]) \n"
".word 0x51fa \n"
"1: \n"
"move.l %%d1,(%[gpi1]) \n"
"move.l %%d3,(%[gpio]) \n"
"lsl.l #1,%[data] \n"
"move.l %%d2,(%[gpio]) \n"
"tst.b %[data] \n"
"bmi.s 1f \n"
"move.l %%d0,(%[gpi1]) \n"
".word 0x51fa \n"
"1: \n"
"move.l %%d1,(%[gpi1]) \n"
"move.l %%d3,(%[gpio]) \n"
"lsl.l #1,%[data] \n"
"move.l %%d2,(%[gpio]) \n"
"tst.b %[data] \n"
"bmi.s 1f \n"
"move.l %%d0,(%[gpi1]) \n"
".word 0x51fa \n"
"1: \n"
"move.l %%d1,(%[gpi1]) \n"
"move.l %%d3,(%[gpio]) \n"
"lsl.l #1,%[data] \n"
"move.l %%d2,(%[gpio]) \n"
"tst.b %[data] \n"
"bmi.s 1f \n"
"move.l %%d0,(%[gpi1]) \n"
".word 0x51fa \n"
"1: \n"
"move.l %%d1,(%[gpi1]) \n"
"move.l %%d3,(%[gpio]) \n"
"lsl.l #1,%[data] \n"
"move.l %%d2,(%[gpio]) \n"
"tst.b %[data] \n"
"bmi.s 1f \n"
"move.l %%d0,(%[gpi1]) \n"
".word 0x51fa \n"
"1: \n"
"move.l %%d1,(%[gpi1]) \n"
"move.l %%d3,(%[gpio]) \n"
"lsl.l #1,%[data] \n"
"move.l %%d2,(%[gpio]) \n"
"tst.b %[data] \n"
"bmi.s 1f \n"
"move.l %%d0,(%[gpi1]) \n"
".word 0x51fa \n"
"1: \n"
"move.l %%d1,(%[gpi1]) \n"
"move.l %%d3,(%[gpio]) \n"
"lsl.l #1,%[data] \n"
"move.l %%d2,(%[gpio]) \n"
"move.w %%d4,%%sr \n" /* reenable interrupts */
: /* outputs */
: /* inputs */
[data]"d"(*p_bytes++),
[gpio]"a"(&GPIO_OUT),
[gpi1]"a"(&GPIO1_OUT)
: /* clobbers */
"d0", "d1", "d2", "d3", "d4"
);
}
}
CS_HI;
}
void lcd_remote_write_command_ex(int cmd, int data)
{
int i;
CS_LO;
RS_LO;
CS_LO;
for (i = 0; i < 8; i++)
for (i = 8; i > 0; i--)
{
if (cmd & 0x80)
DATA_HI;
@ -194,7 +308,7 @@ void lcd_remote_write_command_ex(int cmd, int data)
CLK_LO;
}
for (i = 0; i < 8; i++)
for (i = 8; i > 0; i--)
{
if (data & 0x80)
DATA_HI;