stm32 TFTLCD驱动原理（三）

代码的实现

（1）

首先是对 TFTLCD 进行引脚初始化

static void LCD_GPIO_Config ( void ){GPIO_InitTypeDef GPIO_InitStructure;  /* 使能复用IO时钟：复用为fsmc功能 */RCC_APB2PeriphClockCmd ( RCC_APB2Periph_AFIO, ENABLE );    /* 使能FSMC对应相应管脚时钟 */RCC_APB2PeriphClockCmd ( RCC_APB2Periph_GPIOD | RCC_APB2Periph_GPIOE, ENABLE );  FSMC_LCD_CS_APBxClock_FUN ( FSMC_LCD_CS_CLK, ENABLE );  FSMC_LCD_DC_APBxClock_FUN ( FSMC_LCD_DC_CLK, ENABLE );  FSMC_LCD_BK_APBxClock_FUN ( FSMC_LCD_BK_CLK, ENABLE );  /* 配置FSMC相对应的数据线,FSMC-D0~D15: PD 14 15 0 1,PE 7 8 9 10 11 12 13 14 15,PD 8 9 10 */GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_InitStructure.GPIO_Mode =  GPIO_Mode_AF_PP;GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0  | GPIO_Pin_1  | GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10 | GPIO_Pin_14 | GPIO_Pin_15;GPIO_Init ( GPIOD, & GPIO_InitStructure );GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7 | GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10 | GPIO_Pin_11 | GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;GPIO_Init ( GPIOE,  & GPIO_InitStructure ); /* 配置FSMC相对应的控制线 * PD4-FSMC_NOE   :LCD-RD * PD5-FSMC_NWE   :LCD-WR * PG12-FSMC_NE4  :LCD-CS * PF0-FSMC_A0    :LCD-DC */GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_InitStructure.GPIO_Mode =  GPIO_Mode_AF_PP;GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4; GPIO_Init (GPIOD, & GPIO_InitStructure );GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5; GPIO_Init (GPIOD, & GPIO_InitStructure );  GPIO_InitStructure.GPIO_Pin = FSMC_LCD_CS_PIN; GPIO_Init ( FSMC_LCD_CS_PORT, & GPIO_InitStructure );  GPIO_InitStructure.GPIO_Pin = FSMC_LCD_DC_PIN; GPIO_Init ( FSMC_LCD_DC_PORT, & GPIO_InitStructure );  /* 配置LCD背光控制管脚BK*/GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz; GPIO_InitStructure.GPIO_Pin = FSMC_LCD_BK_PIN; GPIO_Init ( FSMC_LCD_BK_PORT, & GPIO_InitStructure );  /* 初始化时先不开背光 */  GPIO_ResetBits(FSMC_LCD_BK_PORT,FSMC_LCD_BK_PIN);}

FSMC模式配置以及时序

/**  * 函数功能: LCD  FSMC 模式配置  * 输入参数: 无  * 返 回 值: 无  * 说    明：读写使用相同时间配置  */static void LCD_FSMC_Config ( void ){FSMC_NORSRAMInitTypeDef  FSMC_NORSRAMInitStructure;FSMC_NORSRAMTimingInitTypeDef  fsmc_lcd; /* 使能FSMC时钟*/RCC_AHBPeriphClockCmd ( RCC_AHBPeriph_FSMC, ENABLE );fsmc_lcd.FSMC_AddressSetupTime      = 0x02; //地址建立时间fsmc_lcd.FSMC_AddressHoldTime       = 0x00; //地址保持时间fsmc_lcd.FSMC_DataSetupTime         = 0x05; //数据建立时间fsmc_lcd.FSMC_BusTurnAroundDuration = 0x00;fsmc_lcd.FSMC_CLKDivision           = 0x00;fsmc_lcd.FSMC_DataLatency           = 0x00;fsmc_lcd.FSMC_AccessMode            = FSMC_AccessMode_B; //模式B比较适用于LCDFSMC_NORSRAMInitStructure.FSMC_Bank                  = FSMC_LCD_BACKx;FSMC_NORSRAMInitStructure.FSMC_DataAddressMux        = FSMC_DataAddressMux_Disable;FSMC_NORSRAMInitStructure.FSMC_MemoryType            = FSMC_MemoryType_NOR;FSMC_NORSRAMInitStructure.FSMC_MemoryDataWidth       = FSMC_MemoryDataWidth_16b;FSMC_NORSRAMInitStructure.FSMC_BurstAccessMode       = FSMC_BurstAccessMode_Disable;FSMC_NORSRAMInitStructure.FSMC_WaitSignalPolarity    = FSMC_WaitSignalPolarity_Low;FSMC_NORSRAMInitStructure.FSMC_WrapMode              = FSMC_WrapMode_Disable;FSMC_NORSRAMInitStructure.FSMC_WaitSignalActive      = FSMC_WaitSignalActive_BeforeWaitState;FSMC_NORSRAMInitStructure.FSMC_WriteOperation        = FSMC_WriteOperation_Enable;FSMC_NORSRAMInitStructure.FSMC_WaitSignal            = FSMC_WaitSignal_Disable;FSMC_NORSRAMInitStructure.FSMC_ExtendedMode          = FSMC_ExtendedMode_Disable;FSMC_NORSRAMInitStructure.FSMC_WriteBurst            = FSMC_WriteBurst_Disable;FSMC_NORSRAMInitStructure.FSMC_ReadWriteTimingStruct = & fsmc_lcd;FSMC_NORSRAMInitStructure.FSMC_WriteTimingStruct     = & fsmc_lcd;  FSMC_NORSRAMInit ( & FSMC_NORSRAMInitStructure ); /* 使能 FSMC_Bank1_NORSRAM4 */FSMC_NORSRAMCmd ( FSMC_LCD_BACKx, ENABLE );  }

可以看出对LCD的操作转化为对地址的操作

/* 宏定义 --------------------------------------------------------------------*//******************************************************************************2^26 =0X0400 0000 = 64MB,每个 BANK 有4*64MB = 256MB64MB:FSMC_Bank1_NORSRAM1:0X6000 0000 ~ 0X63FF FFFF64MB:FSMC_Bank1_NORSRAM2:0X6400 0000 ~ 0X67FF FFFF64MB:FSMC_Bank1_NORSRAM3:0X6800 0000 ~ 0X6BFF FFFF64MB:FSMC_Bank1_NORSRAM4:0X6C00 0000 ~ 0X6FFF FFFF选择BANK1-BORSRAM4 连接 TFT，地址范围为0X6C00 0000 ~ 0X6FFF FFFFYS-F1P开发板选择 FSMC_A0 接LCD的DC(寄存器/数据选择)脚寄存器基地址 = 0X6C00 0000RAM基地址 = 0X6C00 0002 = 0X6C00 0000+(1<<(0+1))如果电路设计时选择不同的地址线时，地址要重新计算  *******************************************************************************//******************************* ILI9488 显示屏的 FSMC 参数定义 ***************/#define FSMC_LCD_CMD                   ((uint32_t)0x6C000000)    //FSMC_Bank1_NORSRAM1用于LCD命令操作的地址#define FSMC_LCD_DATA                  ((uint32_t)0x6C000002)      //FSMC_Bank1_NORSRAM1用于LCD数据操作的地址      #define LCD_WRITE_CMD(x)               *(__IO uint16_t *)FSMC_LCD_CMD  = x #define LCD_WRITE_DATA(x)              *(__IO uint16_t *)FSMC_LCD_DATA = x#define LCD_READ_DATA()                *(__IO uint16_t *)FSMC_LCD_DATA

模块的初始化操作。

/**  * 函数功能: 液晶模组初始化  * 输入参数: 无  * 返 回 值: 无  * 说    明：无  */uint32_t BSP_LCD_Init(void){LCD_GPIO_Config();LCD_FSMC_Config();    lcd_id=LCD_ReadID();  if(lcd_id==0x548066 || lcd_id==0x8066)  {    ILI9488_REG_Config();  }  LCD_Clear(0,0,LCD_DEFAULT_WIDTH,LCD_DEFAULT_HEIGTH,BLACK);  LCD_DELAY(2000);    return lcd_id;}

显示屏的基本操作函数

* 扩展变量 ------------------------------------------------------------------*//* 函数声明 ------------------------------------------------------------------*/uint32_t BSP_LCD_Init(void);void LCD_SetDirection(uint8_t ucOtion);void LCD_OpenWindow(uint16_t usX,uint16_t usY,uint16_t usWidth,uint16_t usHeight);void LCD_Clear(uint16_t usX,uint16_t usY,uint16_t usWidth,uint16_t usHeight,uint16_t usColor);void LCD_SetPointPixel(uint16_t usX,uint16_t usY,uint16_t usColor);uint16_t LCD_GetPointPixel(uint16_t usX,uint16_t usY);void LCD_DrawLine(uint16_t usX1,uint16_t usY1,uint16_t usX2,uint16_t usY2,uint16_t usColor);void LCD_DrawRectangle(uint16_t usX_Start,uint16_t usY_Start, uint16_t usWidth,uint16_t usHeight,uint16_t usColor,uint8_t ucFilled);void LCD_DrawCircle(uint16_t usX_Center,uint16_t usY_Center,uint16_t usRadius,uint16_t usColor,uint8_t ucFilled);void LCD_DispChar_EN(uint16_t usX,uint16_t usY,const char cChar,uint16_t usColor_Background,uint16_t usColor_Foreground,USB_FONT_Typdef font);void LCD_DispString_EN(uint16_t usX,uint16_t usY,const char *pStr,uint16_t usColor_Background,uint16_t usColor_Foreground,USB_FONT_Typdef font);#endif /* __BSP_LCD_H__ */

资料地址：链接：http://pan.baidu.com/s/1qXIV8ny 密码：9o4k