s3c2440lcd控制器設(shè)置及代碼詳解-資料下載頁(yè)
2025-07-07 12:02本頁(yè)面
【正文】 4MB區(qū)域?qū)R，保證LCDBANK的值在移動(dòng)視圖時(shí)不會(huì)改變。LCDBASEU[20:0] = ((U32)LCD_BUFFER 1)amp。0x1fffffFor dualscan LCD : These bits indicate A[21:1] of the start address of the upper address counter, which is for the upper frame memory of dual scan LCD or the frame memory of single scan LCD.For singlescan LCD : These bits indicate A[21:1] of the start address of the LCD frame buffer.雙掃描：表明高地址計(jì)數(shù)器的起始地址A[21:1]，用于LCD雙掃描的上部幀內(nèi)存或者單掃描的幀內(nèi)存單掃描：表明LCD幀緩沖的起始地址A[21:1]LCDSADDR2 0x4d000018幀緩沖起始寄存器2LCDBASEL[20:0] = ((LCD_ADDR + LCD_WIDTH * LCD_HEIGHT * 2) 1)amp。 0x1fffff = (LCD_ADDR 1 + LCD_WIDTH * LCD_HEIGHT)amp。 0x1fffffFor dualscan LCD: These bits indicate A[21:1] of the start address of the lower address counter, which is used for the lower frame memory of dual scan LCD.For single scan LCD: These bits indicate A[21:1] of the end address of the LCD frame buffer.LCDBASEL = ((the frame end address) 1) + 1= LCDBASEU + (PAGEWIDTH+OFFSIZE) x (LINEVAL+1)雙掃描：表明低地址計(jì)數(shù)器的起始地址A[21:1]，用于LCD雙掃描的下部幀內(nèi)存或者單掃描的幀內(nèi)存單掃描：表明LCD幀緩沖的結(jié)束地址A[21:1]LCDSADDR3 0x4d00001c幀緩沖起始寄存器3OFFSIZE = 0PAGEWIDTH = 320 虛擬屏頁(yè)寬（半字?jǐn)?shù)量） 定義了幀中的視圖域?qū)挾?程序分析至此，大概已經(jīng)清楚是如何通過(guò)LCD_BUFFER[(y)][(x)] = c來(lái)實(shí)現(xiàn)在LCD上顯示單個(gè)像素了。就是在設(shè)置好各個(gè)LCD寄存器之后，通過(guò)將LCD_BUFFER地址與LCDBANK以及LCDBASEU、LCDBASEL對(duì)應(yīng)之后，通過(guò)改變LCD_BUFFER里不同單元存儲(chǔ)的值(即像素的顏色)，即可在LCD相應(yīng)位置上做出顯示。那么在應(yīng)用不同LCD的時(shí)候，只需對(duì)LCDCONx以及LCDSADDRx做出相應(yīng)的配置，在創(chuàng)建一個(gè)數(shù)組，做出上述的地址映射即可。關(guān)于VCLK計(jì)算，由于配置的是TFT，可用到公式VCLK = HCLK / [(CLKVAL+1) * 2] ( CLKVAL=0 )設(shè)置的FLK為400MHz，HCLK為100MHz，CLKVAL = 4，因此VLCK = 10MHz9 / 9
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鄂ICP備17016276號(hào)-1