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Fixed vertical backporch to work better with full color.

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This commit is contained in:
claudiol 2021-07-19 17:01:18 -04:00
parent 4e3676db66
commit fee3821d34
1 changed files with 11 additions and 11 deletions
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22
firmware/sys/target_prime1/lcd.c
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@ -207,24 +207,24 @@ void lcd_initspidisplay()
// As per ILI9322 datasheet: Back porch is 241 ticks. Needs correction to 240 using register 9 to make it multiple of 3.
// Total then is 240/3 = 80 (includes the sync pulse).
// Using a 1 pulse for sync, the value to use for VIDTCON is HBPD=78 (+1+sync)
// HFPD should then be: 1359 - 3*320 - 240 = 159; HFPD=159/3 = 52 (+1)
// Using a 1 pulse for sync, the value to use for VIDTCON is HBPD=79 (+sync)
// HFPD should then be: 1560 - 3*320 - 240 = 360; HFPD=360/3 = 119 (+1)
// Vertical back porch = 4 lines (incl. 1 line for VSYNC), hence VBPD = 2 (+1)
// Front porch and sync should be 1 line only (VFPD = 0 (+1), VSPW = 0 (+1))
// Vertical back porch = 18 lines (incl. 1 line for VSYNC), hence VBPD = 17 (+1)
// Front porch is 4 typical and sync should be 1 line only (VFPD = 3 (+1) , VSPW = 0 (+1))
// Total lines: 240 + 1 (sync) + 1 (front porch) + 3 (back porch) = 245 lines
// Total lines: 240 + 1 (sync) + 17 (front porch) + 4 (back porch) = 262 lines
// Total ticks per frame = (320+80+53) * 245 = 110985 ticks * 3 (serial RGB interface takes 3 ticks per pixel) = 332955 ticks total
// Total ticks per frame = (320+80+120) * 262 = 136240 ticks * 3 (serial RGB interface takes 3 ticks per pixel) = 408720 ticks total
// Vertical refresh rate of 60 Hz would require a RGB_VCLK = 60 * 332955 = 19,977,300 Hz
// Vertical refresh rate of 60 Hz would require a RGB_VCLK = 60 * 408720 = 24,523,200 Hz
#define LCD_TARGET_REFRESH 55
// UPDATE THE LCD CLOCK WHEN THE CPU CLOCK CHANGES
void __lcd_fix()
{
int clkdiv=(__cpu_getHCLK()<<3)/(332955*LCD_TARGET_REFRESH);
int clkdiv=(__cpu_getHCLK()<<3)/(408720*LCD_TARGET_REFRESH);
clkdiv+=7;
clkdiv>>=3; // Round to closest integer to stay as close to target as possible
@ -245,7 +245,7 @@ int lcd_setmode(int mode, unsigned int *physbuf)
*VIDCON0 = *VIDCON0 & 0xFFFFFFFC;
int clkdiv=(__cpu_getHCLK()<<3)/(332955*LCD_TARGET_REFRESH);
int clkdiv=(__cpu_getHCLK()<<3)/(408720*LCD_TARGET_REFRESH);
clkdiv+=7;
clkdiv>>=3; // Round to closest integer to stay as close to target as possible
@ -254,8 +254,8 @@ int lcd_setmode(int mode, unsigned int *physbuf)
*VIDCON1 = 0x80; // All pulses normal, use VCLK rising edge
*VIDTCON0 = 0x030000; // Set Vertical Front/Back porch and sync
*VIDTCON1 = 0x4e3400; // Set Horizontal Front/Back porch and sync
*VIDTCON0 = 0x110300; // Set Vertical Front/Back porch and sync (17 + 4 + 1)
*VIDTCON1 = 0x4f7700; // Set Horizontal Front/Back porch and sync (79 + 120 + 1)
*VIDTCON2 = 0x7793f; // Set screen size 320x240
*VIDOSD1A = *VIDOSD0A = 0; // Window 0/1 top left corner = (0,0)