RA8889，RA8876，RA8877，RA8873及RAA8871系列控制器 内建 SPI master 接口，此功能主要使为了使用外部闪存/ROM，支持的协议有 4-BUS (Normal Read)、 5-BUS (FAST Read)、 Dual mode 0、 Dual mode 1 与 Mode 0/Mode 3。
外部串行flash我们支持市面上大部分的NOR FLASH，若客户需要用到大容量NAND FLASH，我们的芯片支持华邦的W25N01GYZEIT，更换为NAND FLASH后DMA的调用则与NOR FLASH有点不同，操作如下：

需要将flash中的图片先调到显存中，再用BTE搬用显示，
调取函数如下

void SPI_NAND_DMA (unsigned long dma_page_addr,unsigned long X_coordinate,unsigned long Y_coordinate,unsigned int picture_Width,unsigned int picture_Height,unsigned long pic_buffer_Layer,unsigned long Show_pic_Layer,unsigned char chorma,unsigned long Background_color)

{

 

#ifdef MCU_8bit_ColorDepth_8bpp

  Background_color_256(Background_color); 

#endif

#ifdef MCU_8bit_ColorDepth_16bpp

  Background_color_65k(Background_color); 

#endif

#ifdef MCU_8bit_ColorDepth_24bpp

  Background_color_16M(Background_color); 

#endif

#ifdef MCU_16bit_ColorDepth_16bpp

  Background_color_65k(Background_color); 

#endif

#ifdef MCU_16bit_ColorDepth_24bpp_Mode_1

  Background_color_16M(Background_color); 

#endif

#ifdef MCU_16bit_ColorDepth_24bpp_Mode_2

  Background_color_16M(Background_color); 

#endif

 

nSS_Active();

SPI_Master_FIFO_Data_Put(0x13); //page data read(13h)

SPI_Master_FIFO_Data_Put(0x00); //8Dummy clock

SPI_Master_FIFO_Data_Put((dma_page_addr)>>8);   //page address MSB

SPI_Master_FIFO_Data_Put(dma_page_addr);   //page address LSB

nSS_Inactive();

delay_us(50); //delay for buffer load

 

Memory_Linear_Mode();

SFI_DMA_Source_Start_Address(dma_page_addr);//24bit address

 

#if defined  MCU_8bit_ColorDepth_8bpp

SFI_DMA_Transfer_Number(picture_Width*picture_Height);//picture Width x Height x Color depth(8/8=1)

#endif

#if defined  MCU_8bit_ColorDepth_16bpp 

SFI_DMA_Transfer_Number(picture_Width*picture_Height*2);//picture Width x Height x Color depth(16/8=2)

#endif

#if defined  MCU_16bit_ColorDepth_16bpp

SFI_DMA_Transfer_Number(picture_Width*picture_Height*2);//picture Width x Height x Color depth(16/8=2)

#endif

#if defined  MCU_8bit_ColorDepth_24bpp 

SFI_DMA_Transfer_Number(picture_Width*picture_Height*3);//picture Width x Height x Color depth(24/8=3)

#endif

#if defined  MCU_16bit_ColorDepth_24bpp_Mode_1

SFI_DMA_Transfer_Number(picture_Width*picture_Height*3);//picture Width x Height x Color depth(24/8=3)

#endif

#if defined  MCU_16bit_ColorDepth_24bpp_Mode_2

SFI_DMA_Transfer_Number(picture_Width*picture_Height*3);//picture Width x Height x Color depth(24/8=3)

#endif

SFI_DMA_Destination_Start_Address(pic_buffer_Layer);//DMA to Memory Address 1280*480*3

  

Start_SFI_DMA();

Check_2D_Busy();

 

  BTE_S0_Color_24bpp();

  BTE_S0_Memory_Start_Address(pic_buffer_Layer); //S0 Address 1280*480*3

  BTE_S0_Image_Width(picture_Width);

  BTE_S0_Window_Start_XY(0,0);

 

  BTE_Destination_Color_24bpp();  

  BTE_Destination_Memory_Start_Address(Show_pic_Layer);

  BTE_Destination_Image_Width(canvus_width);

  BTE_Destination_Window_Start_XY(X_coordinate,Y_coordinate);

  

 if(chorma==0)

 {

  BTE_ROP_Code(12);

  BTE_Operation_Code(0x02);

 }

 if(chorma==1)

 {

  BTE_Operation_Code(0x05);

 }

  BTE_Window_Size(picture_Width,picture_Height);

  BTE_Enable();

  Check_BTE_Busy();

  Memory_XY_Mode();

}

直接将此函数添加进API并调用即可，如果使用本公司提供的开发板且须添加初始化函数SPI_NAND_initial_1 (void)初始化或者SPI_NAND_initial_0 (void)选择CS0还是CS1

void SPI_NAND_initial_1 (void)

{

  Memory_Linear_Mode();

 

SPI_Clock_Period(0);

 

//  Reset_CPOL();   

Set_CPOL();

// Reset_CPHA();

    Set_CPHA();

 

Select_nSS_drive_on_xnsfcs1();

W25N01_Device_Reset();

W25N01_Clear_BUF();

W25N01_Set_ECC();

 

//Select_standard_SPI_Mode0_or_Mode3();

Select_RA8875_SPI_Mode0_and_Mode3();

 

//Select_SFI_Single_Mode_Dummy_0T_03h();

Select_SFI_Single_Mode_Dummy_8T_0Bh();

//Select_SFI_Single_Mode_Dummy_16T_1Bh();

//Select_SFI_Dual_Mode_Dummy_8T_3Bh();

//Select_SFI_Dual_Mode_Dummy_4T_BBh();

 

Enable_SFlash_SPI();

Select_SFI_1();

Select_SFI_DMA_Mode();

Select_SFI_24bit_Address();

 

Memory_XY_Mode();

 

}

void SPI_NAND_initial_0 (void)

{

  Memory_Linear_Mode();

 

SPI_Clock_Period(0);

 

//  Reset_CPOL();   

Set_CPOL();

// Reset_CPHA();

    Set_CPHA();

 

Select_nSS_drive_on_xnsfcs0();

W25N01_Device_Reset();

W25N01_Clear_BUF();

W25N01_Set_ECC();

 

//Select_standard_SPI_Mode0_or_Mode3();

Select_RA8875_SPI_Mode0_and_Mode3();

 

//Select_SFI_Single_Mode_Dummy_0T_03h();

Select_SFI_Single_Mode_Dummy_8T_0Bh();

//Select_SFI_Single_Mode_Dummy_16T_1Bh();

//Select_SFI_Dual_Mode_Dummy_8T_3Bh();

//Select_SFI_Dual_Mode_Dummy_4T_BBh();

 

Enable_SFlash_SPI();

Select_SFI_0();

Select_SFI_DMA_Mode();

Select_SFI_24bit_Address();

 

Memory_XY_Mode();

}

使用范例：


注意图片放置地址不可超出显存大小，例：分辨率为800*480 、24bpp放置到第二个图层则为800*480*3 即1152000
 
这里要根据图片实际信息进行设置

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