一.连接说明：

Stm32F429支持8080接口与RGB接口的屏驱，本文所使用的型号为KD028QVFMA025（屏驱ST7789S+2.8寸TFT）屏幕采用8080接口接口与Stm32F429相连。Stm32系列MCU的8080接口方式都是通过FSMC来实现的，所以本文使用FMC驱动屏幕。如下是MCU与LCD的连接图： 

二.：FSMC驱动

1.确定LCD_REG地址：

FSMC管理者4Blank的存储块，把TFT看做类似SRAM的存储器，只能接在 BANK1上，如下图所示：

而BANK1又有划分为四个片选,分别对应基地址:

NE1 0x600000000

NE2 0x640000000

NE3 0x680000000

NE4 0x6C0000000

由连接图可知，LCD_CS接在了PG12上对应的是FMC_NE_4，所以：LCD_REG=0x6C0000000

2.确定LCD_RAM地址：

LCD_RAM由LCD_CS和LCD_REG地址决定，

LCD_RAM = LCD_REG + （1<<(n+1)），n为LCD_CS对应的地址线

由连接图可知LCD_CS接在了PG1上对应的是FMC_A11，所以n=11，所以：LCD_RAM = （0x6C0000000 + （1<<(11+1)））

#define LCD_REG    ((uint32_t)0x6C000000)	 		 	    /* FMC_NE_4		*/
#define LCD_RAM    ((uint32_t)0x6C000000+(1<<(11+1)))       /* FSMC_A11		*/

3.配置Gpio：

配置FSMC_D0-D15，FSMC_NOE，FSMC_NWE，FSMC_NE_4，FSMC_A11，FSMC_RESET共21根线

	GPIO_InitTypeDef GPIO_Initure;__HAL_RCC_GPIOD_CLK_ENABLE();			//使能GPIOD时钟__HAL_RCC_GPIOE_CLK_ENABLE();			//使能GPIOE时钟__HAL_RCC_GPIOG_CLK_ENABLE();			//使能GPIOG时钟/*	初始化PDx			*/GPIO_Initure.Pin=GPIO_PIN_0|GPIO_PIN_1|GPIO_PIN_4|GPIO_PIN_5|GPIO_PIN_8|GPIO_PIN_9|GPIO_PIN_10|GPIO_PIN_14|GPIO_PIN_15;GPIO_Initure.Mode=GPIO_MODE_AF_PP; 		//复用GPIO_Initure.Pull=GPIO_PULLUP;			//上拉GPIO_Initure.Speed=GPIO_SPEED_HIGH;		//高速GPIO_Initure.Alternate=GPIO_AF12_FMC;	//复用为FMCHAL_GPIO_Init(GPIOD,&GPIO_Initure);/*	初始化PEx			*/GPIO_Initure.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;HAL_GPIO_Init(GPIOE,&GPIO_Initure);/*	初始化PGx：PG12=FMC_NE，	PG1=FSMC_A11		*/GPIO_Initure.Pin=GPIO_PIN_1|GPIO_PIN_12;HAL_GPIO_Init(GPIOG,&GPIO_Initure);GPIO_Initure.Pin=LCD_RESET_PIN; //PD1,0GPIO_Initure.Mode=GPIO_MODE_OUTPUT_PP;  //推挽输出GPIO_Initure.Pull=GPIO_PULLUP;          //上拉GPIO_Initure.Speed=GPIO_SPEED_HIGH;     //高速HAL_GPIO_Init(LCD_RESET_PORT,&GPIO_Initure);

3.配置FSMC：

FSMC的时钟由HCLK提供，所以180M频率的执行时间为1/180M=5.5ns，由KD028QVFMA025规格所示：

    FMC_NORSRAM_TimingTypeDef FSMC_ReadWriteTim;FMC_NORSRAM_TimingTypeDef FSMC_WriteTim;__HAL_RCC_CRC_CLK_ENABLE();		//使能CRC时钟__HAL_RCC_FMC_CLK_ENABLE();				//使能FMC时钟SRAM_Handler.Instance=FMC_Bank1;        //BANK1SRAM_Handler.Extended=FMC_Bank1E;       SRAM_Handler.Init.NSBank=FMC_NORSRAM_BANK4;     //使用NE4SRAM_Handler.Init.DataAddressMux=FMC_DATA_ADDRESS_MUX_DISABLE;  //不复用数据线SRAM_Handler.Init.MemoryType=FMC_MEMORY_TYPE_SRAM;              //SRAMSRAM_Handler.Init.MemoryDataWidth=FMC_NORSRAM_MEM_BUS_WIDTH_16; //16位数据宽度SRAM_Handler.Init.BurstAccessMode=FMC_BURST_ACCESS_MODE_DISABLE; //是否使能突发访问,仅对同步突发存储器有效,此处未用到SRAM_Handler.Init.WaitSignalPolarity=FMC_WAIT_SIGNAL_POLARITY_LOW;//等待信号的极性,仅在突发模式访问下有用SRAM_Handler.Init.WaitSignalActive=FMC_WAIT_TIMING_BEFORE_WS;   //存储器是在等待周期之前的一个时钟周期还是等待周期期间使能NWAITSRAM_Handler.Init.WriteOperation=FMC_WRITE_OPERATION_ENABLE;    //存储器写使能SRAM_Handler.Init.WaitSignal=FMC_WAIT_SIGNAL_DISABLE;           //等待使能位,此处未用到SRAM_Handler.Init.ExtendedMode=FMC_EXTENDED_MODE_ENABLE;        //读写使用不同的时序SRAM_Handler.Init.AsynchronousWait=FMC_ASYNCHRONOUS_WAIT_DISABLE;//是否使能同步传输模式下的等待信号,此处未用到SRAM_Handler.Init.WriteBurst=FMC_WRITE_BURST_DISABLE;           //禁止突发写SRAM_Handler.Init.ContinuousClock=FMC_CONTINUOUS_CLOCK_SYNC_ASYNC;    
FSMC_ReadWriteTim.AddressSetupTime      = 0x01; //地址建立时间，1 = 5nsFSMC_ReadWriteTim.AddressHoldTime       = 0x02; //地址保持时间，2*5.5 = 11nsFSMC_ReadWriteTim.DataSetupTime         = 0x02; //数据建立时间，2*5.5 = 11nsFSMC_ReadWriteTim.BusTurnAroundDuration = 0x00;FSMC_ReadWriteTim.CLKDivision           = 0x00;FSMC_ReadWriteTim.DataLatency           = 0x00;FSMC_ReadWriteTim.AccessMode = FMC_ACCESS_MODE_A;HAL_SRAM_Init(&SRAM_Handler, &FSMC_ReadWriteTim, &FSMC_ReadWriteTim);

三.：ST7789S驱动

ST7789S驱动一般都是由厂家提供，代码如下：

    LCD_SET();	DRIVER_DelayMs(1); // Delay 1ms LCD_RESET();	DRIVER_DelayMs(10); // Delay 10ms // This Delay time is necessary LCD_SET();	DRIVER_DelayMs(120); // Delay 120 ms LCD_WR_REG(0x11); DRIVER_DelayMs(120);      //Delay 120ms LCD_WR_REG(0x36);LCD_WR_Data(0x00);LCD_WR_REG(0x3a);LCD_WR_Data(0x05);  //65k//--------------------------------ST7789V Frame rate setting----------------------------------//LCD_WR_REG(0xb2);LCD_WR_Data(0x0c);LCD_WR_Data(0x0c);LCD_WR_Data(0x00);LCD_WR_Data(0x33);LCD_WR_Data(0x33);LCD_WR_REG(0xb7);LCD_WR_Data(0x70);//---------------------------------ST7789V Power setting--------------------------------------//LCD_WR_REG(0xbb);LCD_WR_Data(0x1B);//VCOMLCD_WR_REG(0xc0);LCD_WR_Data(0x2c);LCD_WR_REG(0xc2);LCD_WR_Data(0x01);LCD_WR_REG(0xc3);LCD_WR_Data(0x0B);LCD_WR_REG(0xc4);LCD_WR_Data(0x27);LCD_WR_REG(0xc6);LCD_WR_Data(0x0f);	 LCD_WR_REG(0xd0);LCD_WR_Data(0xa4);LCD_WR_Data(0xA1);//--------------------------------ST7789V gamma setting---------------------------------------//LCD_WR_REG(0xe0);LCD_WR_Data(0xD0);LCD_WR_Data(0x06);LCD_WR_Data(0x0B);LCD_WR_Data(0x09);LCD_WR_Data(0x08);LCD_WR_Data(0x30);LCD_WR_Data(0x30);LCD_WR_Data(0x5B);LCD_WR_Data(0x4B);LCD_WR_Data(0x18);LCD_WR_Data(0x14);LCD_WR_Data(0x14);LCD_WR_Data(0x2C);LCD_WR_Data(0x32);LCD_WR_REG(0xe1);LCD_WR_Data(0xD0);LCD_WR_Data(0x05);LCD_WR_Data(0x0A);LCD_WR_Data(0x0A);LCD_WR_Data(0x07);LCD_WR_Data(0x28);LCD_WR_Data(0x32);LCD_WR_Data(0x2C);LCD_WR_Data(0x49);LCD_WR_Data(0x18);LCD_WR_Data(0x13);LCD_WR_Data(0x13);LCD_WR_Data(0x2C);LCD_WR_Data(0x33);LCD_WR_REG(0x21); //反显LCD_WR_REG(0x2A); //Frame rate controlLCD_WR_Data(0x00);LCD_WR_Data(0x00);LCD_WR_Data(0xEF);LCD_WR_REG(0x2B); //Display function controlLCD_WR_Data(0x00);LCD_WR_Data(0x00);LCD_WR_Data(0x01);LCD_WR_Data(0x3F);LCD_WR_REG(0x29); //display onLCD_WR_REG(0x2c);/*测试*/LCD_clear(RGB565_WHITE);/*初始化后, 把LCD 屏全部填充为白色*/LCD_clear(RGB565_RED);  /*初始化后, 把LCD 屏全部填充为红色*/LCD_clear(RGB565_GREEN);/*初始化后, 把LCD 屏全部填充为绿色*/LCD_clear(RGB565_BLUE); /*初始化后, 把LCD 屏全部填充为蓝色*/

四.：问题

1.屏幕刷新很慢，慢到可以看出一层一层的刷屏图像：

经过发现，是由于新板卡的外部时钟晶振由25M改为了8M，对应的驱动没有更改，导致时钟配置错误所致，所以更改stm32f4xx_hal_conf.h中的如下代码：

#if !defined  (HSE_VALUE) //#define HSE_VALUE    ((uint32_t)25000000) /*!< Value of the External oscillator in Hz */#define HSE_VALUE    ((uint32_t)8000000) 
#endif /* HSE_VALUE */

然后还需要更改时钟配置，

    RCC_OscInitStructure.OscillatorType = RCC_OSCILLATORTYPE_HSE;    //时钟源为HSERCC_OscInitStructure.HSEState = RCC_HSE_ON;                      //打开HSERCC_OscInitStructure.PLL.PLLState = RCC_PLL_ON;//打开PLLRCC_OscInitStructure.PLL.PLLSource = RCC_PLLSOURCE_HSE;//PLL时钟源选择HSE//RCC_OscInitStructure.PLL.PLLM = 25; //主PLL和音频PLL分频系数(PLL之前的分频),取值范围:2~63.RCC_OscInitStructure.PLL.PLLM = 8; //主PLL和音频PLL分频系数(PLL之前的分频),取值范围:2~63.RCC_OscInitStructure.PLL.PLLN = 36; //主PLL倍频系数(PLL倍频),取值范围:64~432.  RCC_OscInitStructure.PLL.PLLP = 2; //系统时钟的主PLL分频系数(PLL之后的分频),取值范围:2,4,6,8.(仅限这4个值!)RCC_OscInitStructure.PLL.PLLQ = 8; //USB/SDIO/随机数产生器等的主PLL分频系数(PLL之后的分频),取值范围:2~15.