手机显示屏驱动培训.ppt

LcdMoudleDriverTraining,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（CSTNColorSTN）TFT高对比度，高响应，宽视角，大容量显示，是主流产品65Kcolor1pixel16bit260kcolor1pixel18bit,硬件接口,串口（serialperipheralinterface）并口（high-speedparallelbusinterfaces）,串口（serialperipheralinterface）,Lowcost，lcdcontroller性能低超低端手机选用，一般用的不太多PindescriptionRSTresetSDISerialinputdata.SDOSerialoutputdata.SCLKSerialclockinput,并口（parallelbusinterfaces）,成本较串口高，lcdcontroller性能高一般同时支持（SPI）pinIM3:0SelectstheSysteminterfacemode.SPIMode68Modereadandwrite共用，一根线select80Modereadlinewriteline各一Pindescription,RSIBresetDB15:0datalineCSBchipsetselectRSSelectstheregister.E_WRBwritestrobesignalRW_RDBreadstrobesignal,软件处理流程,AddressResetLcdcontrollerinitializeRefreshdisplayscreenSleepinSleepout,Address,Baseband的片选，获的地址#defineLCD_DRV_CS_BASE0 x01800000/*CS4asthelcdcs*/#defineLCD_DRV_CS_DATA_OFFSET1/*ADD0asthers*/根据RSPin获得相应的寄存器和数据的地址Low:RegisterIndexHigh:ControldataRS接A0#defineLCD_DRV_ADDR_REG(*(volatileUINT16*)(LCD_DRV_CS_BASE)#defineLCD_DRV_ADDR_DATA(*(volatileUINT16*)(LCD_DRV_CS_BASE+LCD_DRV_CS_DATA_OFFSET)#defineLCD_DRV_WRITE_COMM(Addr,Data)LCD_DRV_ADDR_REG=(UINT16)Addr;LCD_DRV_ADDR_DATA=(UINT16)Data,Reset,InitializestheLSIwhenlow.Mustberesetafterpower-on.通常连接到BB端的一个gpio上,Lcdcontrollerinitialize,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/SetinternalOSCfreq,usedefaultLCD_DRV_WRITE_COMM(0 x0061,0 x0018);/*Powercontrol1setSLPbit=1*/LCD_DRV_WRITE_COMM(0 x0010,0 x1a0e);POWERCONTROL1(R10h),Refreshdisplayscreen,设置刷屏的范围，不同的屏设置不同/HorizontalwindowaddressLCD_DRV_WRITE_REG(0 x0043);LCD_DRV_WRITE_REG(usStartx);LCD_DRV_WRITE_REG(usEndx);/VerticalwindowaddressLCD_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);,Sleepin,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/*Powercontrol1setSLPbit=1*/LCD_DRV_WRITE_COMM(0 x0010,0 x1a0e);,Sleepout,当手机来电或者别的动作，退出待机状态要求显示屏幕时