TFTLCD

TFT液晶屏常用的通信模式主要有6800模式和8080模式，对于TFT彩屏通常都使用8080并口（简称80并口）模式

8080模式的读写时序其实跟LCD1602或者LCD12864的读写时序是差不多的。8080接口有5条基本的控制线和多条数据线，数据线的数量主要看液晶屏使用的是几位模式，有8根、9根、16根、18根四种类型

FSMC

FSMC模块能够与同步或异步存储器和16位PC存储器卡接口

将AHB传输信号转换到适当的外部设备协议

满足访问外部设备的时序要求

所有的外部存储器共享控制器输出的地址、数据和控制信号，每个外部设备可以通过一个唯一的片选信号加以区分。 FSMC在任一时刻只访问一个外部设备

STM32通过FSMC可以与SRAM、ROM、PSRAM、NOR Flash和NAND Flash等存储器的引脚直接相连

外部设备地址映像

从FSMC的角度看，把外部存储器划分为固定大小为256M字节的四个存储块

模式A读写操作

以模式A举例

模式A读操作:

模式A写操作:

FSMC配置步骤

1.使能对应引脚GPIO时钟

2.配置GPIO引脚模式

3.使能FSMC时钟

4.FSMC初始化

5.存储器块使能

6.应用TFTLCD库函数，写字符、数字等

举例

FSMC_NORSRAMTimingInitTypeDef:

FSMC_NORSRAMInitTypeDef:

void TFTLCD_gpio_init()
{
    GPIO_InitTypeDef gpiod =
    {
        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_Speed_50MHz,
        GPIO_Mode_AF_PP
    };  

    GPIO_InitTypeDef gpioe =
    {
        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_Speed_50MHz,
        GPIO_Mode_AF_PP
    };  

    GPIO_InitTypeDef gpiog =
    {
        GPIO_Pin_0 | GPIO_Pin_12,
        GPIO_Speed_50MHz,
        GPIO_Mode_AF_PP
    };  

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD | RCC_APB2Periph_GPIOE | RCC_APB2Periph_GPIOG, ENABLE);

    GPIO_Init(GPIOD, &gpiod);
    GPIO_Init(GPIOE, &gpioe);
    GPIO_Init(GPIOG, &gpiog);
}

void FSMC_init()
{
    FSMC_NORSRAMInitTypeDef fsmc = {0};
    FSMC_NORSRAMTimingInitTypeDef FSMC_ReadWriteTimingStruct = {0};
    FSMC_NORSRAMTimingInitTypeDef FSMC_WriteTimingStruct = {0};

    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_FSMC, ENABLE);

    FSMC_ReadWriteTimingStruct.FSMC_AddressSetupTime = 0x01; //ADDSET建立时间=2个HCLK时钟周期
    FSMC_ReadWriteTimingStruct.FSMC_AddressHoldTime = 0x00; //模式A未用到
    FSMC_ReadWriteTimingStruct.FSMC_DataSetupTime = 0x0f; //DATAST保持时间=16个HCLK时钟周期
    FSMC_ReadWriteTimingStruct.FSMC_BusTurnAroundDuration = 0x00;
    FSMC_ReadWriteTimingStruct.FSMC_CLKDivision = 0x00;
    FSMC_ReadWriteTimingStruct.FSMC_DataLatency = 0x00;
    FSMC_ReadWriteTimingStruct.FSMC_AccessMode = FSMC_AccessMode_A; //访问模式A

    FSMC_WriteTimingStruct.FSMC_AddressSetupTime = 0x0f;     //ADDSET建立时间=16个HCLK时钟周期
    FSMC_WriteTimingStruct.FSMC_AddressHoldTime = 0x0f;
    FSMC_WriteTimingStruct.FSMC_DataSetupTime = 0x05;
    FSMC_WriteTimingStruct.FSMC_BusTurnAroundDuration = 0x00;
    FSMC_WriteTimingStruct.FSMC_CLKDivision = 0x00;
    FSMC_WriteTimingStruct.FSMC_DataLatency = 0x00;
    FSMC_WriteTimingStruct.FSMC_AccessMode = FSMC_AccessMode_A; 

    fsmc.FSMC_Bank = FSMC_Bank1_NORSRAM4;
    fsmc.FSMC_DataAddressMux = FSMC_DataAddressMux_Disable;
    fsmc.FSMC_MemoryType = FSMC_MemoryType_SRAM;
    fsmc.FSMC_MemoryDataWidth = FSMC_MemoryDataWidth_16b;
    fsmc.FSMC_BurstAccessMode = FSMC_BurstAccessMode_Disable;
    fsmc.FSMC_AsynchronousWait = FSMC_AsynchronousWait_Disable;
    fsmc.FSMC_WaitSignalPolarity = FSMC_WaitSignalPolarity_Low;
    fsmc.FSMC_WrapMode = FSMC_WrapMode_Disable;
    fsmc.FSMC_WaitSignalActive = FSMC_WaitSignalActive_BeforeWaitState;
    fsmc.FSMC_WriteOperation = FSMC_WriteOperation_Enable;
    fsmc.FSMC_WaitSignal = FSMC_WaitSignal_Disable;
    fsmc.FSMC_ExtendedMode = FSMC_ExtendedMode_Enable; //扩展模式使能
    fsmc.FSMC_WriteBurst = FSMC_WriteBurst_Disable;
    fsmc.FSMC_ReadWriteTimingStruct = &FSMC_ReadWriteTimingStruct;
    fsmc.FSMC_WriteTimingStruct = &FSMC_WriteTimingStruct;
    FSMC_NORSRAMInit(&fsmc);

    FSMC_NORSRAMCmd(FSMC_Bank1_NORSRAM4, ENABLE); //使能存储块1 NOR/PSRAM 4
}