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[BugFix] Sandisk ClipZip Display Type 0 has no partial X updates

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Type 0 displays had to update the whole x line due to anything other
than a full line causing corruption and tearing

I figured out that flipping x and x_end
(LCD_W - x and LCD_W - x_end)
makes it work properly

Lowered the refresh rate to 95 Hz
Removed Fade in on screen enable

Change-Id: I0b8f76ad01ce7e48bd0a56aa321c30c30f91ce8d
This commit is contained in:
William Wilgus 2026-06-15 22:49:43 -04:00
parent 32b8af9840
commit c3ad489738
1 changed files with 51 additions and 33 deletions
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84
firmware/target/arm/as3525/sansa-clipzip/lcd-clipzip.c
View file

@ -136,7 +136,7 @@ static void lcd_write(uint8_t cmd, uint8_t data)
/* Initialises lcd type 0
* This appears to be a WiseChip OLED display controlled by a SEPS114A.
*/
static void lcd_init_type0(void)
static void lcd_init_type0(void) /* INIT_ATTR */
{
lcd_write(0x01, 0x00); /* SOFT_RESET */
lcd_write(0x14, 0x01); /* STANDBY_ON_OFF */
@ -149,12 +149,14 @@ static void lcd_init_type0(void)
lcd_write(0xEA, 0x0A); /* ? */
lcd_write(0xEB, 0x42); /* ? */
lcd_write(0x18, 0x08); /* DISCHARGE_TIME */
lcd_write(0x1A, 0x0B); /* OSC_ADJUST */
lcd_write(0x1A, 0x03); /* OSC_ADJUST 3 = 95Hz*/
lcd_write(0x48, 0x03); /* ROW_OVERLAP */
lcd_write(0x30, 0x00); /* DISPLAY_X1 */
lcd_write(0x31, 0x5F); /* DISPLAY_X2 */
lcd_write(0x32, 0x00); /* DISPLAY_Y1 */
lcd_write(0x33, 0x5F); /* DISPLAY_Y2 */
lcd_write(0x38, 0x00); /* DISPLAYSTART_X */
lcd_write(0x39, 0x00); /* DISPLAYSTART_Y */
lcd_write(0xE0, 0x10); /* RGB_IF */
lcd_write(0xE1, 0x00); /* RGB_POL */
lcd_write(0xE5, 0x80); /* DISPLAY_MODE_CONTROL */
@ -183,7 +185,7 @@ static void lcd_write_nibbles(uint8_t val)
/* Initialises lcd type 1
* This appears to be a Visionox OLED display, with a LDT LD7134 controller
*/
static void lcd_init_type1(void)
static void lcd_init_type1(void) /* INIT_ATTR */
{
static const uint8_t curve[128] = {
/* 5-bit curve */
@ -273,22 +275,16 @@ void lcd_enable(bool on)
if (lcd_type == 0) {
if (on) {
lcd_write(0x14, 0x00); /* STANDBY_ON_OFF */
lcd_write(0x02, 0x01); /* DISP_ON_OFF */
lcd_write(0xD2, 0x04); /* SCREEN_SAVER_MODE */
lcd_write(0xD0, 0x80); /* SCREEN_SAVER_CONTROL */
sleep(HZ * 100/1000);
lcd_write(0xD0, 0x00); /* SCREEN_SAVER_CONTROL */
lcd_write(0x14, 0x00); /* STANDBY OFF */
lcd_write(0x02, 0x01); /* DISP_ON */
/* apply 180 degree flip via memory write direction (1Dh):
MDIR1|MDIR0 = decrement both; normal is horizontal-decrement */
lcd_write(0x1D, lcd_flipped ? 0x02 : 0x01);
}
else {
lcd_write(0xD2, 0x05);
lcd_write(0xD0, 0x80);
sleep(HZ * 100/1000);
lcd_write(0xD2, 0x05); /* SCREEN_SAVER_MODE 5=FADE_OUT*/
lcd_write(0xD0, 0x80); /* SCREEN_SAVER_CONTROL */
sleep(HZ/10);
lcd_write(0x02, 0x00);
lcd_write(0xD0, 0x00);
@ -296,10 +292,11 @@ void lcd_enable(bool on)
}
}
else {
/* Type 1 */
if (on) {
lcd_write(0x03, 0x00);
lcd_write(0x03, 0x00); /* DSTBY OFF */
lcd_write(0x02, 0x01);
lcd_write(0x02, 0x01); /* DDISP ON */
/* apply 180 degree flip via graphic RAM writing direction (05h):
D[2:0] = 011 starts from XE,YE (both axes reversed) */
@ -325,7 +322,7 @@ bool lcd_active(void)
#endif /* HAVE_LCD_ENABLE */
/* initialises the lcd */
void lcd_init_device(void)
void lcd_init_device(void) /* INIT_ATTR */
{
lcd_type = lcd_hw_init();
if (lcd_type == 0) {
@ -340,33 +337,52 @@ void lcd_init_device(void)
/* sets up the lcd to receive frame buffer data */
static void lcd_setup_rect(int x, int x_end, int y, int y_end)
{
if (lcd_flipped) {
int fx, fx_end, fy;
if (lcd_type == 0) {
if (lcd_flipped) /* Type 0 LCD requires the flipped fx and fx_end ??*/
{
/* Mirror the window to the opposite corner; the reversed write
direction set in lcd_enable() fills it back-to-front, drawing the
framebuffer rotated 180 degrees with no per-pixel work. */
int fx = LCD_WIDTH - 1 - x_end;
int fy = LCD_HEIGHT - 1 - y_end;
x_end = LCD_WIDTH - 1 - x;
y_end = LCD_HEIGHT - 1 - y;
x = fx;
y = fy;
}
if (lcd_type == 0) {
lcd_write(0x34, x); /* MEM_X1 */
lcd_write(0x35, x_end); /* MEM_X2 */
fx = x;
fx_end = x_end;
fy = LCD_HEIGHT - 1 - y_end;
y_end = LCD_HEIGHT - 1 - y;
y = fy;
}
else
{
fx = LCD_WIDTH - 1 - x_end;
fx_end = LCD_WIDTH - 1 - x;
}
lcd_write(0x34, fx); /* MEM_X1 */
lcd_write(0x35, fx_end);/* MEM_X2 */
lcd_write(0x36, y); /* MEM_Y1 */
lcd_write(0x37, y_end); /* MEM_Y2 */
lcd_write_cmd(0x08); /* DDRAM_DATA_ACCESS_PORT */
lcd_write_cmd(0x08); /* DDRAM_DATA_ACCESS_PORT */
}
else {
/* Type 1*/
if (lcd_flipped) {
/* Mirror the window to the opposite corner; the reversed write
direction set in lcd_enable() fills it back-to-front, drawing the
framebuffer rotated 180 degrees with no per-pixel work. */
fx = LCD_WIDTH - 1 - x_end;
x_end = LCD_WIDTH - 1 - x;
x = fx;
fy = LCD_HEIGHT - 1 - y_end;
y_end = LCD_HEIGHT - 1 - y;
y = fy;
}
lcd_write_cmd(0x0A); /* Set Read/Write Box Data */
lcd_write_nibbles(x);
lcd_write_nibbles(x_end);
lcd_write_nibbles(y);
lcd_write_nibbles(y_end);
lcd_write_cmd(0x0C); /* Read/Write Display Data */
}
}
@ -438,12 +454,14 @@ void lcd_update_rect(int x, int y, int width, int height)
return;
}
#if 0 /* no longer needed unless it turns out that some devices are wired backwards */
/* update entire horizontal strip for display type 0 (wisechip) */
if (lcd_type == 0) {
x = 0;
x_end = 96;
}
#endif
/* correct rectangle (if necessary) */
if (x < 0) {
x = 0;