H300: Cut-down LCD init & working display flip.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@9078 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 127 insertions, 150 deletions

diff --git a/firmware/drivers/lcd-h300.c b/firmware/drivers/lcd-h300.c
index 046bd3a..0bdb123 100644
--- a/firmware/drivers/lcd-h300.c
+++ b/firmware/drivers/lcd-h300.c
@@ -30,7 +30,9 @@
 #include "font.h"
 #include "bidi.h"
 
-static bool display_on=false; /* is the display turned on? */
+static bool display_on = false; /* is the display turned on? */
+static bool display_flipped = false;
+static int xoffset = 0; /* needed for flip */
 
 /* register defines */
 #define R_START_OSC             0x00
@@ -101,72 +103,76 @@ void lcd_set_invert_display(bool yesno)
     (void)yesno;
 }
 
-/* turn the display upside down (call lcd_update() afterwards) */
-void lcd_set_flip(bool yesno)
+static void flip_lcd(bool yesno)
 {
-    (void)yesno;
+    if (yesno)
+    {
+        lcd_write_reg(R_DRV_OUTPUT_CONTROL, 0x031b); /* 224 lines, GS=SS=1 */
+        lcd_write_reg(R_GATE_SCAN_POS, 0x0002);      /* 16 lines offset */
+        lcd_write_reg(R_1ST_SCR_DRV_POS, 0xdf04);    /* 4..223 */
+    }
+    else
+    {
+        lcd_write_reg(R_DRV_OUTPUT_CONTROL, 0x001b); /* 224 lines, GS=SS=0 */
+        lcd_write_reg(R_GATE_SCAN_POS, 0x0000);
+        lcd_write_reg(R_1ST_SCR_DRV_POS, 0xdb00);    /* 0..219 */
+    }
 }
 
-/* LCD init */
-void lcd_init_device(void)
+/* turn the display upside down (call lcd_update() afterwards) */
+void lcd_set_flip(bool yesno)
 {
-    /* GPO46 is LCD RESET */
-    or_l(0x00004000, &GPIO1_OUT);
-    or_l(0x00004000, &GPIO1_ENABLE);
-    or_l(0x00004000, &GPIO1_FUNCTION);
+    display_flipped = yesno;
+    xoffset = yesno ? 4 : 0;
 
-    /* Reset LCD */
-    sleep(1);
-    and_l(~0x00004000, &GPIO1_OUT);
-    sleep(1);
-    or_l(0x00004000, &GPIO1_OUT);
-    sleep(1);
+    if (display_on)
+        flip_lcd(yesno);
+}
 
+static void _display_on(void)
+{
+    /** Sequence according to datasheet, p. 132 **/
+    
     lcd_write_reg(R_START_OSC, 0x0001); /* Start Oscilation */
     sleep(1);
-    lcd_write_reg(R_DISP_CONTROL1, 0x0040); /* zero all bits */ 
-    lcd_write_reg(R_POWER_CONTROL3, 0x0000);
-    lcd_write_reg(R_POWER_CONTROL4, 0x0000);
+
+    /* zero everything*/
+    lcd_write_reg(R_POWER_CONTROL1, 0x0000); /* STB = 0, SLP = 0 */
+    lcd_write_reg(R_DISP_CONTROL1, 0x0000);  /* GON = 0, DTE = 0, D1-0 = 00b */
+    lcd_write_reg(R_POWER_CONTROL3, 0x0000); /* PON = 0 */
+    lcd_write_reg(R_POWER_CONTROL4, 0x0000); /* VCOMG = 0 */
     sleep(1);
-    lcd_write_reg(R_POWER_CONTROL2, 0x0003); /* VciOUT = 0.83*VciLVL */
-    lcd_write_reg(R_POWER_CONTROL3, 0x0008); /* Vreg1OUT = REGP*1.90 */
-
-    /* Vcom-level amplitude = 1.23*Vreg1OUT
-     * VcomH-level amplitude = 0.84*Vreg1OUT */
-    lcd_write_reg(R_POWER_CONTROL4, 0x3617); 
-    lcd_write_reg(R_POWER_CONTROL3, 0x0008); /* Vreg1OUT = REGP*1.90 */
-    lcd_write_reg(R_POWER_CONTROL1, 0x0004); /* Step-up circuit 1 ON */
-    lcd_write_reg(R_POWER_CONTROL1, 0x0004);
+
+    /* initialise power supply */
     
-    lcd_write_reg(R_POWER_CONTROL2, 0x0002); /* VciOUT = 0.87*VciLVL */
-    lcd_write_reg(R_POWER_CONTROL3, 0x0018); /* turn on VLOUT3  */
-    lcd_write_reg(R_POWER_CONTROL1, 0x0044); /* LCD power supply Op.Amp 
-                                                const curr = 1 */
-    sleep(1);
+    /* DC12-10 = 000b: Step-up1 = clock/8,
+     * DC02-00 = 000b: Step-up2 = clock/16,
+     * VC2-0   = 010b: VciOUT = 0.87 * VciLVL */
+    lcd_write_reg(R_POWER_CONTROL2, 0x0002); 
     
-    /* Step-up rate:
-     * VLOUT1 (DDVDH) = Vci1*2
-     * VLOUT4 (VCL)   = Vci1*(-1)
-     * VLOUT2 (VGH)   = DDVDH*3 = Vci1*6
-     * VLOUT3 (VGL)   = - DDVDH*2 = Vci1*(-4) */
-    lcd_write_reg(R_POWER_CONTROL1, 0x0144); 
-
-    /* Step-Up circuit 1 Off;
-     * VLOUT2 (VGH)   = Vci1 + DDVDH*2 = Vci1*5
-     * VLOUT3 (VGL)   = -(Vci1+DDVDH) = Vci1*(-3) */ 
-    lcd_write_reg(R_POWER_CONTROL1, 0x0540);
-
-    /* Vcom-level ampl = Vreg1OUT*1.11
-     * VcomH-level ampl = Vreg1OUT*0.86 */
-    lcd_write_reg(R_POWER_CONTROL4, 0x3218); 
-    /* ??Number lines invalid? */
-    lcd_write_reg(R_DRV_OUTPUT_CONTROL, 0x001b);
-
-    /* B/C = 1 ; n-line inversion form; polarity inverses at completion of
-     * driving n lines
-     * Exclusive OR = 1; polarity inversion occurs by applying an EOR to
-     * odd/even frame select signal and an n-line inversion signal.
-     * FLD = 01b (1 field interlaced scan, external display iface) */
+    /* VRH3-0 = 1000b: Vreg1OUT = REGP * 1.90 */
+    lcd_write_reg(R_POWER_CONTROL3, 0x0008);
+    
+    /* VDV4-0 = 00110b: VcomA = Vreg1OUT * 0.76,
+     * VCM4-0 = 10000b: VcomH = Vreg1OUT * 0.70*/
+    lcd_write_reg(R_POWER_CONTROL4, 0x0610);     
+
+    lcd_write_reg(R_POWER_CONTROL1, 0x0044); /* AP2-0 = 100b, DK = 1 */
+    lcd_write_reg(R_POWER_CONTROL3, 0x0018); /* PON = 1 */
+
+    sleep(4); /* Step-up circuit stabilising time */
+    
+    /* start power supply */
+
+    lcd_write_reg(R_POWER_CONTROL1, 0x0540); /* BT2-0 = 101b, DK = 0 */
+    lcd_write_reg(R_POWER_CONTROL4, 0x2610); /* VCOMG = 1 */
+
+    /* other settings */
+
+    /* B/C = 1: n-line inversion form
+     * EOR = 1: polarity inversion occurs by applying an EOR to odd/even
+     *          frame select signal and an n-line inversion signal.
+     * FLD = 01b: 1 field interlaced scan, external display iface */
     lcd_write_reg(R_DRV_WAVEFORM_CONTROL, 0x0700);
 
     /* Address counter updated in vertical direction; left to right;
@@ -176,55 +182,27 @@ void lcd_init_device(void)
      * Replace data on writing to GRAM */
     lcd_write_reg(R_ENTRY_MODE, 0x7038);
 
-    /* ???? compare val = (1)1100 0011 0000b; the MSB bit is out of spec.*/
-    lcd_write_reg(R_COMPARE_REG1, 0x7030);
-    lcd_write_reg(R_COMPARE_REG2, 0x0000);
-    
-    lcd_write_reg(R_GATE_SCAN_POS, 0x0000);
-    lcd_write_reg(R_VERT_SCROLL_CONTROL, 0x0000);
+    flip_lcd(display_flipped);
 
-    /* Gate Line = 0+1 = 1
-     * gate "end" line = 0xdb + 1 = 0xdc */ 
-    lcd_write_reg(R_1ST_SCR_DRV_POS, 0xdb00);
     lcd_write_reg(R_2ND_SCR_DRV_POS, 0x0000);
-    lcd_write_reg(R_HORIZ_RAM_ADDR_POS, 0xaf00);/* horiz ram addr 0 - 175 */
-    lcd_write_reg(R_VERT_RAM_ADDR_POS, 0xdb00);/* vert ram addr 0 - 219 */
+    lcd_write_reg(R_VERT_SCROLL_CONTROL, 0x0000);
 
     /* 19 clocks,no equalization */
     lcd_write_reg(R_FRAME_CYCLE_CONTROL, 0x0002);
 
     /* Transfer mode for RGB interface disabled
      * internal clock operation;
-     * System interface/VSYNC interface */ 
+     * System interface/VSYNC interface */
     lcd_write_reg(R_EXT_DISP_IF_CONTROL, 0x0003);
-    sleep(1);
-    lcd_write_reg(R_POWER_CONTROL1, 0x4540); /* Turn on the op-amp (1) */
-
-    /* Enable internal display operations, not showed on the ext. display yet
-     * Source: GND; Internal: ON; Gate-Driver control signals: ON*/
-    lcd_write_reg(R_DISP_CONTROL1, 0x0041); 
-    sleep(1);
 
     /* Front porch lines: 8; Back porch lines: 8; */
     lcd_write_reg(R_DISP_CONTROL2, 0x0808);
 
     /* Scan mode by the gate driver in the non-display area: disabled;
-     * Cycle of scan by the gate driver - set to 31frames(518ms),disabled by 
-     * above setting */
+     * Cycle of scan by the gate driver - set to 31frames(518ms), 
+     * disabled by above setting */
     lcd_write_reg(R_DISP_CONTROL3, 0x003f);
-    sleep(1);
 
-    /* Vertical scrolling disabled;
-     * Gate Output: VGH/VGL;
-     * Reversed grayscale image on;
-     * Source output: Non-lit display; internal disp.operation: ON, gate-driver
-     * control signals: ON
-     * Note: bit 6 (zero based) isn't set to 1 (according to the datasheet
-     * it should be) */
-    lcd_write_reg(R_DISP_CONTROL1, 0x0636);
-    sleep(1);
-    lcd_write_reg(R_DISP_CONTROL1, 0x0626);/* Gate output:VGL; 6th bit not set*/
-    sleep(1);
     lcd_write_reg(R_GAMMA_FINE_ADJ_POS1, 0x0003);
     lcd_write_reg(R_GAMMA_FINE_ADJ_POS2, 0x0707);
     lcd_write_reg(R_GAMMA_FINE_ADJ_POS3, 0x0007);
@@ -235,73 +213,72 @@ void lcd_init_device(void)
     lcd_write_reg(R_GAMMA_GRAD_ADJ_NEG, 0x0507);
     lcd_write_reg(R_GAMMA_AMP_ADJ_RES_POS, 0x1d09);
     lcd_write_reg(R_GAMMA_AMP_AVG_ADJ_RES_NEG, 0x0303);
-    
-    /* VcomH = Vreg1OUT*0.70
-     * Vcom amplitude = Vreg1OUT*0.78 */
-    lcd_write_reg(R_POWER_CONTROL4, 0x2610);
-
-    /* LCD ON 
-     * Vertical scrolling: Originaly designated position/external display
-     * Reverse grayscale off;
-     * Internal display operation ON, Gate driver control signals: ON; Source
-     * output GND */  
-    lcd_write_reg(R_DISP_CONTROL1, 0x0061);
-    sleep(1);
 
-    /* init the GRAM, the framebuffer is already cleared in the 
-     * device independent lcd_init() */
-    lcd_write_reg(R_RAM_ADDR_SET, 0);
-    lcd_begin_write_gram();
-    lcd_write_data((unsigned short *)lcd_framebuffer, LCD_WIDTH*LCD_HEIGHT);
+    display_on=true;  /* must be done before calling lcd_update() */
+    lcd_update();
+    
+    sleep(4); /* op-amp stabilising time */
  
-    /* Reverse grayscale on;
-     * Source output: display */ 
-    lcd_write_reg(R_DISP_CONTROL1, 0x0067);
+    /** Sequence according to datasheet, p. 130 **/
+
+    lcd_write_reg(R_POWER_CONTROL1, 0x4540); /* SAP2-0=100, BT2-0=101, AP2-0=100 */
+    lcd_write_reg(R_DISP_CONTROL1, 0x0005);  /* GON=0, DTE=0, REV=1, D1-0=01 */
+    sleep(2);
+    
+    lcd_write_reg(R_DISP_CONTROL1, 0x0025);  /* GON=1, DTE=0, REV=1, D1-0=01 */
+    lcd_write_reg(R_DISP_CONTROL1, 0x0027);  /* GON=1, DTE=0, REV=1, D1-0=11 */
+    sleep(2);
+
+    lcd_write_reg(R_DISP_CONTROL1, 0x0037);  /* GON=1, DTE=1, REV=1, D1-0=11 */
+}
+
+/* LCD init */
+void lcd_init_device(void)
+{
+    /* GPO46 is LCD RESET */
+    or_l(0x00004000, &GPIO1_OUT);
+    or_l(0x00004000, &GPIO1_ENABLE);
+    or_l(0x00004000, &GPIO1_FUNCTION);
+
+    /* Reset LCD */
+    and_l(~0x00004000, &GPIO1_OUT);
+    sleep(1);
+    or_l(0x00004000, &GPIO1_OUT);
     sleep(1);
 
-    /* Vertical Scrolling disabled
-     * Gate output: VGH/VGL
-     * 6th bit not set*/ 
-    lcd_write_reg(R_DISP_CONTROL1, 0x0637);
-    /* ok, the display is finally on */
-    display_on=true;
+    _display_on();
 }
 
 void lcd_enable(bool on)
 {
     if(display_on!=on)
-    {    
+    {
         if(on)
         {
-            lcd_init_device();
+            _display_on();
         }
         else
         {
-            lcd_write_reg(R_FRAME_CYCLE_CONTROL,0x0002); /* No EQ, 19 clocks */
-        
-            /* Gate Output VGH/VGL; Non-lit display internal disp. ON, 
-             * gate-driver control ON; */
-            lcd_write_reg(R_DISP_CONTROL1,0x0072);
-            sleep(1);
-            lcd_write_reg(R_DISP_CONTROL1,0x0062); /* Gate Output: VGL */
-            sleep(1);
-
-            /* Gate Output VGH; Source Output: GND; 
-             * internal display operation:halt
-             * Gate-Driver control signals: OFF */
-            lcd_write_reg(R_DISP_CONTROL1,0x0040);
-        
-            /* Now, turn off the power */
+            /** Off sequence according to datasheet, p. 130 **/
+
+            lcd_write_reg(R_FRAME_CYCLE_CONTROL, 0x0002); /* EQ=0, 18 clks/line */
+            lcd_write_reg(R_DISP_CONTROL1, 0x0036);  /* GON=1, DTE=1, REV=1, D1-0=10 */
+            sleep(2);
+
+            lcd_write_reg(R_DISP_CONTROL1, 0x0026);  /* GON=1, DTE=0, REV=1, D1-0=10 */
+            sleep(2);
+
+            lcd_write_reg(R_DISP_CONTROL1, 0x0000);  /* GON=0, DTE=0, D1-0=00 */
 
-            /* Halt op. amp & step-up circuit */
-            lcd_write_reg(R_POWER_CONTROL1,0x0000); 
-            lcd_write_reg(R_POWER_CONTROL3,0x0000); /* Turn OFF VLOUT3 */
+            lcd_write_reg(R_POWER_CONTROL1, 0x0000); /* SAP2-0=000, AP2-0=000 */
+            lcd_write_reg(R_POWER_CONTROL3, 0x0000); /* PON=0 */
+            lcd_write_reg(R_POWER_CONTROL4, 0x0000); /* VCOMG=0 */
+            
+            /* datasheet p. 131 */
+            lcd_write_reg(R_POWER_CONTROL1, 0x0001); /* STB=1: standby mode */
 
-            /* halt negative volt ampl. */
-            lcd_write_reg(R_POWER_CONTROL4,0x0000); 
             display_on=false;
         }
-        /* display_on = on */
     }
 }
 
@@ -319,7 +296,7 @@ void lcd_blit(const fb_data* data, int x, int by, int width,
     (void)width;
     (void)bheight;
     (void)stride;
-    /*if(display_on)*/ 
+    /*if(display_on)*/
 }
 
 
@@ -329,8 +306,15 @@ void lcd_update(void) ICODE_ATTR;
 void lcd_update(void)
 {
     if(display_on){
+        /* reset update window */
+        /* horiz ram addr: 0 - 175 */
+        lcd_write_reg(R_HORIZ_RAM_ADDR_POS, 0xaf00);
+
+        /* vert ram addr: 0 - 219 */
+        lcd_write_reg(R_VERT_RAM_ADDR_POS,((xoffset+219)<<8) | xoffset);
+
         /* Copy display bitmap to hardware */
-        lcd_write_reg(R_RAM_ADDR_SET, 0);
+        lcd_write_reg(R_RAM_ADDR_SET, xoffset << 8);
         lcd_begin_write_gram();
         lcd_write_data((unsigned short *)lcd_framebuffer, LCD_WIDTH*LCD_HEIGHT);
     }
@@ -353,11 +337,11 @@ void lcd_update_rect(int x, int y, int width, int height)
         /* set update window */ 
 
         /* horiz ram addr */ 
-        lcd_write_reg(R_HORIZ_RAM_ADDR_POS, (ymax<<8) | y); 
+        lcd_write_reg(R_HORIZ_RAM_ADDR_POS, (ymax << 8) | y);
         
         /* vert ram addr */ 
-        lcd_write_reg(R_VERT_RAM_ADDR_POS,((x+width-1)<<8) | x);
-        lcd_write_reg(R_RAM_ADDR_SET, (x<<8) | y);
+        lcd_write_reg(R_VERT_RAM_ADDR_POS,((x+xoffset+width-1) << 8) | (x+xoffset));
+        lcd_write_reg(R_RAM_ADDR_SET, ((x+xoffset) << 8) | y);
         lcd_begin_write_gram(); 
 
         /* Copy specified rectangle bitmap to hardware */ 
@@ -365,12 +349,5 @@ void lcd_update_rect(int x, int y, int width, int height)
         { 
             lcd_write_data ((unsigned short *)&lcd_framebuffer[y][x], width); 
         } 
-
-        /* reset update window */ 
-        /* horiz ram addr: 0 - 175 */ 
-        lcd_write_reg(R_HORIZ_RAM_ADDR_POS, 0xaf00); 
-
-        /* vert ram addr: 0 - 219 */  
-        lcd_write_reg(R_VERT_RAM_ADDR_POS, 0xdb00);
     }
 }