大家好，我在调试NXP的LPC2478的LCD驱动器时遇到如下问题：
我的LCD是典型的4位单扫描的黑白STN屏。在调试的过程中发现调色板不知道如何初始化，如果我不初始化调色板的话，就完全没有显示，如果初始化第0，1个调色板为0XFFFF0000，则可以显示，但显示会乱，显示出来的不是我写入的。另外还有一个问题就是我在显存中写第一行，但是显示的是第一二行都有显示。这就导致写1/4屏就会有1/2屏显示，写1/2屏就全屏都有显示。调试了2天都没有成功，也没有可参考的代码。下面是我的初始化代码，请用过的大侠指点一二。
#define GUI_LCM_XMAX (320) /* LCD x size */
#define GUI_LCM_YMAX (240) /* LCD y size */
#define LcdPwr 1
#define LcdTFT 0
#define LcdBpp 0
#define LcdEn 1
#define HBP 5 /* Horizontal back porch */
#define HFP 5 /* Horizontal front porch */
#define HSW 3 /* Horizontal pulse width */
#define VBP 2 /* Vertical back porch */
#define VFP 2 /* Vertical front porch */
#define VSW 1 /* Vertical pulse width */
#define PPL (GUI_LCM_XMAX / 16) - 1 /* Pixels-per-line */
#define LPP (GUI_LCM_YMAX - 1) /* Lines-per-panel */
#define CPL (GUI_LCM_XMAX / 4) - 1 /* clock per line */
PCONP |= (1 << 20); /* enable LCD controller power */
LCD_CTRL |= (1 << 11); /* Power enable */
/* P2.2:LCDDCLK P2.3:LCDFP P2.4:LCDFP P2.5:LCDLP
P2.6:UD[0] P2.7:UD[1] P2.8:UD[2] P2.9:UD[3] */
PINSEL4 &= ~((0x3 << 2*2) | (0x3 << 2*3) | (0x3 << 2*5) |
(0x3 << 2*6) | (0x3 << 2*7) | (0x3 << 2*8) |
(0x3 << 2*9));
PINSEL4 |= ((0x3 << 2*2) | (0x3 << 2*3) | (0x3 << 2*5) |
(0x3 << 2*6) | (0x3 << 2*7) | (0x3 << 2*8) |
(0x3 << 2*9));
/* DISP OFF is control by LCDM in GPIO mode */
FIO2DIR |= 1 << 4;
FIO2SET |= 1 << 4; /* set DISP_OFF high to open */
PINSEL10 &= 0xFFFFFFF7; /* disable the ETM interface
pins */
PINSEL11 = (int)(0xfffffffll << 4) /* Reserved,should write 1 */
| (0 << 1) /* 4-bit mono STN single */
| (1 << 0); /* lcd port is enable */
_DelayNs(15);
LCD_UPBASE = ((unsigned int)(&frameBuffer)); /* set buffer's base address */
LCD_CTRL = 0; /* power disable */
_DelayNs(20);
LCD_CFG = 0x07; /* pixel clock 9MHZ */
LCD_TIMH = (HBP << 24) | /* set horizontal timing */
(HFP << 16) |
(HSW << 8) |
(PPL << 2);
LCD_TIMV = (VBP << 24) | /* set vertical timing */
(VFP << 16) |
(VSW << 10) |
(LPP << 0);
LCD_POL = (0 << 26) | /* bypass pixel color driver */
(CPL << 16) | /* clock per line */
(0 << 14) | /* LCDENAB output pin is active
HIGH in TFT mode,no care in
STN mode */
(0 << 13) | /* Data is driven on the LCD on
the rising edge of LCDDCLK */
(0 << 12) | /* HSYNC is active low */
(0 << 11) | /* VSYNC is active low */
(0 << 5) | /* select HCLK:clock source for
the LCD block is HCLK */
(0x01); /* Lower five bits of panel
clock divisor. */
LCD_CTRL = (LcdTFT << 5) | /* select TFT LCD type */
(1 << 6) | /* monochrome LCD uses a 4-bit
interface */
(1 << 4) | /* STN LCD is monochrome */
(LcdBpp << 1) | /* select 1bpp */
(LcdEn); /* LCD enable */
LCD_INTMSK = 0; /* disable LCD interrupt */
_DelayNs(20);
ptr = (volatile unsigned long *)(LCD_BASE_ADDR + 0x200);
ptr[0] = 0xffff0000;
LCD_CTRL |= (1 << 11); /* Power enable */
上面的代码中，如果不加入ptr[0] = 0xffff0000; 就完全没有显示。 |
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