STM32F407 FSMC 控制RA8875驱动程序

以下是一个简单的示例程序，用于控制STM32F407的FSMC与RA8875驱动器进行通信。

首先，需要在STM32F407上初始化FSMC。以下是一个简单的初始化代码示例：

void FSMC_Init(void)
{
    FSMC_NORSRAMInitTypeDef  FSMC_NORSRAMInitStructure;
    FSMC_NORSRAMTimingInitTypeDef  p;
    
    RCC_AHB3PeriphClockCmd(RCC_AHB3Periph_FSMC, ENABLE);
    
    p.FSMC_AddressSetupTime = 0x01;
    p.FSMC_AddressHoldTime = 0x00;
    p.FSMC_DataSetupTime = 0x0f;
    p.FSMC_BusTurnAroundDuration = 0x00;
    p.FSMC_CLKDivision = 0x00;
    p.FSMC_DataLatency = 0x00;
    p.FSMC_AccessMode = FSMC_AccessMode_B;
    
    FSMC_NORSRAMInitStructure.FSMC_Bank = FSMC_Bank1_NORSRAM1;
    FSMC_NORSRAMInitStructure.FSMC_DataAddressMux = FSMC_DataAddressMux_Disable;
    FSMC_NORSRAMInitStructure.FSMC_MemoryType = FSMC_MemoryType_SRAM;
    FSMC_NORSRAMInitStructure.FSMC_MemoryDataWidth = FSMC_MemoryDataWidth_16b;
    FSMC_NORSRAMInitStructure.FSMC_BurstAccessMode = FSMC_BurstAccessMode_Disable;
    FSMC_NORSRAMInitStructure.FSMC_AsynchronousWait = FSMC_AsynchronousWait_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_Enable;
    FSMC_NORSRAMInitStructure.FSMC_WriteBurst = FSMC_WriteBurst_Disable;
    FSMC_NORSRAMInitStructure.FSMC_ReadWriteTimingStruct = &p;
    FSMC_NORSRAMInitStructure.FSMC_WriteTimingStruct = &p;
    
    FSMC_NORSRAMInit(&FSMC_NORSRAMInitStructure);
    
    FSMC_NORSRAMCmd(FSMC_Bank1_NORSRAM1, ENABLE);
}

然后需要初始化RA8875驱动器，以下是一个简单的初始化代码示例：

void RA8875_Init(void)
{
    RA8875_SendCMD(RA8875_PWRR);
    RA8875_SendData(0x00);
    
    RA8875_SendCMD(RA8875_PLLC1);
    RA8875_SendData(0x0d);
    
    RA8875_SendCMD(RA8875_PLLC2);
    RA8875_SendData(0x02);
    
    RA8875_SendCMD(RA8875_SYSR);
    RA8875_SendData(0x08);
    
    RA8875_SendCMD(RA8875_PCSR);
    RA8875_SendData(0x0a);
    
    RA8875_SendCMD(RA8875_DPCR);
    RA8875_SendData(0x03);
    
    RA8875_SendCMD(RA8875_HDWR);
    RA8875_SendData(0xef);
    
    RA8875_SendCMD(RA8875_HNDFTR);
    RA8875_SendData(0x00);
    
    RA8875_SendCMD(RA8875_HNDR);
    RA8875_SendData(0x01);
    
    RA8875_SendCMD(RA8875_HSTR);
    RA8875_SendData(0x00);
    
    RA8875_SendCMD(RA8875_HPWR);
    RA8875_SendData(0x83);
    
    RA8875_SendCMD(RA8875_VDHR0);
    RA8875_SendData(0x00);
    
    RA8875_SendCMD(RA8875_VDHR1);
    RA8875_SendData(0x01);
    
    RA8875_SendCMD(RA8875_VNDR0);
    RA8875_SendData(0x2f);
    
    RA8875_SendCMD(RA8875_VNDR1);
    RA8875_SendData(0x03);
    
    RA8875_SendCMD(RA8875_VSTR0);
    RA8875_SendData(0x00);
    
    RA8875_SendCMD(RA8875_VSTR1);
    RA8875_SendData(0x01);
    
    RA8875_SendCMD(RA8875_VPWR);
    RA8875_SendData(0x81);
    
    RA8875_SendCMD(RA8875_MWCR0);
    RA8875_SendData(0x0f);
    
    RA8875_SendCMD(RA8875_DCR);
    RA8875_SendData(0x20);
    
    RA8875_SendCMD(RA8875_FNCR0);
    RA8875_SendData(0x00);
}

最后，可以通过FSMC与RA8875进行通信。以下是一个简单的写入数据代码示例：

void RA8875_WriteData(uint16_t data)
{
    *(volatile uint16_t *) (Bank1_SRAM1_ADDR + reg_address) = data;
}

其中，`Bank1_SRAM1_ADDR`是在初始化FSMC时指定的地址，`reg_address`是RA8875驱动器的寄存器地址。可以通过查看RA8875的数据手册获得寄存器地址。

这些代码示例可以用作启动点，以便您开始编写您自己的FSMC与RA8875驱动器通信程序。