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Archos player: Introduce lcd_write_command_e (only one data byte) in the lcd driver, for cleaner C code.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@12835 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jens Arnold 2007-03-18 17:58:49 +00:00
parent f1bf798b8a
commit cb1c9e447e
3 changed files with 112 additions and 79 deletions
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28
firmware/drivers/lcd-player.c
View file

@ -106,8 +106,6 @@ unsigned short buffer_lcd_mirror[11][2];
#ifdef SIMULATOR
unsigned char hardware_buffer_lcd[11][2];
#else
static unsigned char lcd_data_byte; /* global write buffer */
#endif
#define NO_CHAR -1
@ -133,8 +131,7 @@ static void lcd_free_pat(int map_ch)
#ifdef SIMULATOR
hardware_buffer_lcd[x][y]=substitute_char;
#else
lcd_write_command(LCD_CURSOR(x, y));
lcd_write_data(&substitute_char, 1);
lcd_write_command_e(LCD_CURSOR(x, y), substitute_char);
#endif
}
}
@ -231,8 +228,7 @@ void xlcd_update(void)
#ifdef SIMULATOR
hardware_buffer_lcd[x][y]=hw_ch;
#else
lcd_write_command(LCD_CURSOR(x,y));
lcd_write_data(&hw_ch, 1);
lcd_write_command_e(LCD_CURSOR(x,y), hw_ch);
#endif
}
}
@ -265,9 +261,7 @@ bool lcdx_putc(int x, int y, unsigned short ch)
#ifdef SIMULATOR
hardware_buffer_lcd[x][y]=lcd_char;
#else
lcd_data_byte = (unsigned char) lcd_char;
lcd_write_command(LCD_CURSOR(x, y));
lcd_write_data(&lcd_data_byte, 1);
lcd_write_command_e(LCD_CURSOR(x, y), lcd_char);
#endif
return false;
}
@ -451,14 +445,12 @@ void lcd_icon(int icon, bool enable)
pos = icon_pos[icon];
mask = icon_mask[icon];
lcd_write_command(LCD_ICON(pos));
if(enable)
icon_mirror[pos] |= mask;
else
icon_mirror[pos] &= ~mask;
lcd_write_data(&icon_mirror[pos], 1);
lcd_write_command_e(LCD_ICON(pos), icon_mirror[pos]);
}
int lcd_default_contrast(void)
@ -468,9 +460,7 @@ int lcd_default_contrast(void)
void lcd_set_contrast(int val)
{
lcd_data_byte = (unsigned char) (31 - val);
lcd_write_command(lcd_contrast_set);
lcd_write_data(&lcd_data_byte, 1);
lcd_write_command_e(lcd_contrast_set, 31 - val);
}
#endif /* SIMULATOR */
@ -500,9 +490,7 @@ void lcd_init (void)
or_b(0x0f, &PBDRL); /* ... and high */
lcd_write_command(NEW_LCD_FUNCTION_SET + 1); /* CGRAM selected */
lcd_write_command(NEW_LCD_CONTRAST_SET);
lcd_data_byte = 0x08;
lcd_write_data(&lcd_data_byte, 1);
lcd_write_command_e(NEW_LCD_CONTRAST_SET, 0x08);
lcd_write_command(NEW_LCD_POWER_SAVE_MODE_OSC_CONTROL_SET + 2);
/* oscillator on */
lcd_write_command(NEW_LCD_POWER_CONTROL_REGISTER_SET + 7);
@ -599,9 +587,7 @@ void lcd_init (void)
for (i=0; i<300000; i++) asm volatile ("nop"); /* wait 150 ms */
lcd_write_command(0x31);
lcd_write_command(0xa8); /* Set contrast control */
lcd_data_byte = 0;
lcd_write_data(&lcd_data_byte, 1); /* 0 */
lcd_write_command_e(0xa8, 0); /* Set contrast control */
}
#endif
#endif /* !SIMULATOR */

1
firmware/export/lcd.h
View file

@ -46,6 +46,7 @@ typedef unsigned long fb_data;
/* common functions */
extern void lcd_write_command(int byte);
extern void lcd_write_command_e(int cmd, int data);
extern void lcd_write_command_ex(int cmd, int data1, int data2);
extern void lcd_write_data(const fb_data* p_bytes, int count);
extern void lcd_init(void);

160
firmware/target/sh/archos/player/lcd-as-player.S
View file

@ -69,30 +69,76 @@
/* Write a command byte to the lcd controller
*
* Arguments:
* r4 - data byte (int)
* r4 - command byte (int)
*
* Register usage:
* r0 - scratch
* r1 - data byte (copied)
* r1 - command byte (copied)
* r2 - precalculated port value (CS, DS and SC low, SD high)
* r3 - lcd port address
* r5 - 1 (byte count for reuse of the loop in _lcd_write_data)
*/
_lcd_write_command:
mov.l .lcdr,r3 /* put lcd data port address in r3 */
mov r4,r1 /* copy data byte to r1 */
mov #1,r5 /* set byte count to 1 (!) */
mov.l .lcdr, r3 /* put lcd data port address in r3 */
mov r4, r1 /* copy data byte to r1 */
mov #1, r5 /* set byte count to 1 (!) */
/* This code will fail if an interrupt changes the contents of PBDRL.
* If so, we must disable the interrupt here. */
mov.b @r3,r0 /* r0 = PBDRL */
or #(LCD_SD),r0 /* r0 |= LCD_SD */
mov.b @r3, r0 /* r0 = PBDRL */
or #(LCD_SD), r0 /* r0 |= LCD_SD */
and #(~(LCD_CS|LCD_DS|LCD_SC)),r0 /* r0 &= ~(LCD_CS|LCD_DS|LCD_SC) */
bra .single_transfer /* jump into the transfer loop */
mov r0,r2
mov r0, r2
.align 2
.global _lcd_write_command_e
.type _lcd_write_command_e,@function
/* Write a command byte and a data byte to the lcd controller
*
* Arguments:
* r4 - command byte
* r5 - data byte
*
* Register usage:
* r0 - scratch
* r1 - command/data byte (copied)
* r2 - precalculated port value (CS, DS and SC low, SD high)
* r3 - lcd port address
* r5 - 1 (byte count for reuse of the loop in _lcd_write_data)
* r6 - data byte (saved)
* r7 - saved pr
*/
_lcd_write_command_e:
mov.l .lcdr, r3 /* put lcd data port address in r3 */
mov r4, r1 /* copy data byte to r1 */
mov r5, r6
mov #1, r5 /* set byte count to 1 (!) */
/* This code will fail if an interrupt changes the contents of PBDRL.
* If so, we must disable the interrupt here. */
mov.b @r3, r0 /* r0 = PBDRL */
or #(LCD_SD), r0 /* r0 |= LCD_SD */
and #(~(LCD_CS|LCD_DS|LCD_SC)),r0 /* r0 &= ~(LCD_CS|LCD_DS|LCD_SC) */
sts pr, r7
bsr .single_transfer /* jump into the transfer loop */
mov r0, r2
lds r7, pr
mov r6, r1
mov #1, r5 /* set byte count to 1 (!) */
or #(LCD_DS|LCD_SD), r0 /* r0 |= LCD_DS|LCD_SD */
and #(~(LCD_CS|LCD_SC)), r0 /* r0 &= ~(LCD_CS|LCD_SC) */
bra .single_transfer /* jump into the transfer loop */
mov r0, r2
.align 2
@ -116,7 +162,7 @@ _lcd_write_command:
*/
_lcd_write_data:
mov.l .lcdr,r3 /* put lcd data port address in r3 */
mov.l .lcdr, r3 /* put lcd data port address in r3 */
nop /* align here */
/* This code will fail if an interrupt changes the contents of PBDRL.
@ -126,98 +172,98 @@ _lcd_write_data:
* disable/precalculate/transfer/enable for each iteration. However,
* this would significantly decrease performance. */
mov.b @r3,r0 /* r0 = PBDRL */
or #(LCD_DS|LCD_SD),r0 /* r0 |= LCD_DS|LCD_SD */
and #(~(LCD_CS|LCD_SC)),r0 /* r0 &= ~(LCD_CS|LCD_SC) */
mov r0,r2
mov.b @r3, r0 /* r0 = PBDRL */
or #(LCD_DS|LCD_SD), r0 /* r0 |= LCD_DS|LCD_SD */
and #(~(LCD_CS|LCD_SC)), r0 /* r0 &= ~(LCD_CS|LCD_SC) */
mov r0, r2
.align 2
.multi_transfer:
mov.b @r4+,r1 /* load data byte from memory */
mov.b @r4+, r1 /* load data byte from memory */
.single_transfer:
shll16 r1 /* shift data to most significant byte */
shll8 r1
shll r1 /* shift the msb into carry */
mov r2,r0 /* copy precalculated port value */
mov r2, r0 /* copy precalculated port value */
bt 1f /* data bit = 1? */
and #(~LCD_SD),r0 /* no: r0 &= ~LCD_SD */
and #(~LCD_SD), r0 /* no: r0 &= ~LCD_SD */
1:
shll r1 /* next shift here for alignment */
mov.b r0,@r3 /* set data to port */
or #(LCD_SC),r0 /* rise SC (independent of SD level) */
mov.b r0,@r3 /* set to port */
mov.b r0, @r3 /* set data to port */
or #(LCD_SC), r0 /* rise SC (independent of SD level) */
mov.b r0, @r3 /* set to port */
mov r2,r0
mov r2, r0
bt 1f
and #(~LCD_SD),r0
and #(~LCD_SD), r0
1:
mov.b r0,@r3
or #(LCD_SC),r0
mov.b r0,@r3
mov.b r0, @r3
or #(LCD_SC), r0
mov.b r0, @r3
shll r1
mov r2,r0
mov r2, r0
bt 1f
and #(~LCD_SD),r0
and #(~LCD_SD), r0
1:
shll r1
mov.b r0,@r3
or #(LCD_SC),r0
mov.b r0,@r3
mov.b r0, @r3
or #(LCD_SC), r0
mov.b r0, @r3
mov r2,r0
mov r2, r0
bt 1f
and #(~LCD_SD),r0
and #(~LCD_SD), r0
1:
mov.b r0,@r3
or #(LCD_SC),r0
mov.b r0,@r3
mov.b r0, @r3
or #(LCD_SC), r0
mov.b r0, @r3
shll r1
mov r2,r0
mov r2, r0
bt 1f
and #(~LCD_SD),r0
and #(~LCD_SD), r0
1:
shll r1
mov.b r0,@r3
or #(LCD_SC),r0
mov.b r0,@r3
mov.b r0, @r3
or #(LCD_SC), r0
mov.b r0, @r3
mov r2,r0
mov r2, r0
bt 1f
and #(~LCD_SD),r0
and #(~LCD_SD), r0
1:
mov.b r0,@r3
or #(LCD_SC),r0
mov.b r0,@r3
mov.b r0, @r3
or #(LCD_SC), r0
mov.b r0, @r3
shll r1
mov r2,r0
mov r2, r0
bt 1f
and #(~LCD_SD),r0
and #(~LCD_SD), r0
1:
shll r1
mov.b r0,@r3
or #(LCD_SC),r0
mov.b r0,@r3
mov.b r0, @r3
or #(LCD_SC), r0
mov.b r0, @r3
mov r2,r0
mov r2, r0
bt 1f
and #(~LCD_SD),r0
and #(~LCD_SD), r0
1:
mov.b r0,@r3
or #(LCD_SC),r0
mov.b r0,@r3
mov.b r0, @r3
or #(LCD_SC), r0
mov.b r0, @r3
add #-1,r5 /* decrease byte count */
tst r5,r5 /* r5 == 0 ? */
add #-1, r5 /* decrease byte count */
tst r5, r5 /* r5 == 0 ? */
bf .multi_transfer /* no: next iteration */
or #(LCD_CS|LCD_DS|LCD_SD|LCD_SC),r0 /* restore port */
rts
mov.b r0,@r3
mov.b r0, @r3
/* This is the place to reenable the interrupts, if we have disabled
* them. See above. */