手机显示屏驱动培训.ppt
Lcd Moudle Driver Training,Lcd 介绍硬件接口软件处理流程,LCD 介绍,液晶的特性手机中常用的LCD 的产品,液晶的特性,旋光性双折射性LCD，几乎都是利用了液晶的这两种性质制造而成。,手机中常用的LCD 的产品,STN 特点是宽视角，大容量显示，缺点是响应速度慢（CSTN Color STN）TFT 高对比度，高响应，宽视角，大容量显示，是主流产品65K color 1pixel 16bit260k color 1pixel 18bit,硬件接口,串口（serial peripheral interface）并口（high-speed parallel bus interfaces）,串口（serial peripheral interface）,Low cost，lcd controller 性能低超低端手机选用，一般用的不太多Pin description RST resetSDI Serial input data.SDO Serial output data.SCLK Serial clock input,并口（parallel bus interfaces）,成本较串口高，lcd controller 性能高一般同时支持（SPI）pin IM3:0 Selects the System interface mode.SPI Mode68 Moderead and write 共用，一根线select80 Moderead line write line 各一Pin description,RSIBresetDB15:0 data lineCSB chipset selectRS Selects the register.E_WRB write strobe signalRW_RDB read strobe signal,软件处理流程,AddressResetLcd controller initializeRefresh display screenSleep inSleep out,Address,Baseband的片选，获的地址#define LCD_DRV_CS_BASE 0 x01800000/*CS4as the lcd cs*/#define LCD_DRV_CS_DATA_OFFSET 1/*ADD0 as the rs*/根据RS Pin获得相应的寄存器和数据的地址Low:Register Index High:Control dataRS 接A0#define LCD_DRV_ADDR_REG(*(volatile UINT16*)(LCD_DRV_CS_BASE)#define LCD_DRV_ADDR_DATA(*(volatile UINT16*)(LCD_DRV_CS_BASE+LCD_DRV_CS_DATA_OFFSET)#define LCD_DRV_WRITE_COMM(Addr,Data)LCD_DRV_ADDR_REG=(UINT16)Addr;LCD_DRV_ADDR_DATA=(UINT16)Data,Reset,Initializes the LSI when low.Must be reset after power-on.通常连接到BB端的一个gpio上,Lcd controller initialize,通过上一步得到的地址，对lcd相应的寄存器，发送相关的命令参数，配置lcd初始化的序列一般都由LCD厂商提供。寄存器设置的方法/Set internalOSCfreq,use defaultLCD_DRV_WRITE_COMM(0 x0061,0 x0018);/*Power control 1 set SLP bit=1*/LCD_DRV_WRITE_COMM(0 x0010,0 x1a0e);POWER CONTROL 1(R10h),Refresh display screen,设置刷屏的范围，不同的屏设置不同/Horizontalwindow addressLCD_DRV_WRITE_REG(0 x0043);LCD_DRV_WRITE_REG(usStartx);LCD_DRV_WRITE_REG(usEndx);/Verticalwindow addressLCD_DRV_WRITE_REG(0 x0042);LCD_DRV_WRITE_REG(usStarty);LCD_DRV_WRITE_REG(usEndy);写数据用个for循环，调用下面的命令写入数据LCD_DRV_WRITE_DATA(UINT16)*disp_buf_addr);,Sleep in,当手机在待机状态时，为了节约功耗，要把lcd进入睡眠模式设置相关的寄存器/*Power control 1 set SLP bit=1*/LCD_DRV_WRITE_COMM(0 x0010,0 x1a0e);,Sleep out,当手机来电或者别的动作，退出待机状态要求显示屏幕时，要把lcd module唤醒，退出睡眠模式设置相关的寄存器/*Power control 1 set SLP bit=0*/LCD_DRV_WRITE_COMM(0 x0010,0 x1a0c);,Thank you!,
