門外漢的筆記

開發工具: STM32CubeMX 6.6.1 (使用這個建立Library)

開發環境: STM32CubeIDE

MCU型號: STM32F103VET6(內建FSMC LCD接口)

LCD型號: ILI9488 8-bit Parallel TFT LCD

LCD Driver library:ILI9341 Driver library for STM32

使用STM32CubeMX設定IO及產生Library

RCC HSE選擇外部震盪器

SYS Devug選擇Serial Wire

Connectivity的FSMC選項，開啟NE1並選擇LCD Interface

LCD Register Select選擇A16(對應DC腳位)

Data選擇8bits(對應8-bits bus line的LCD)

NOR/PSRAM timming的Data setup time設為8

NE1->LCD CS

A16->LCD RS(D/C)

NWR->LCD WR

NOE->LCD RD

FSMC_D0~D7 ->LCD D0~D7

Clock Confirguration設置選擇PLLCLK，頻率設為72MHz。

IDE選擇STM32CubeIDE

選Code Generator勾選Generate peripheral initialization as a pair of'.c/.h' files，執行GENRATE CODE會產生需要的Libraray。

修改LCD Driver的Write command與Write data

開啟ILI9341 Driver library for STM32.c

加入宣告FSMC LCD Register與LCD Data的地址

#define LCD_REG (*(uint8_t *)0x60000000) // A16 low for writing to reg
#define LCD_DATA (*(uint8_t *)0x60010000) // A16 high for writring data

修改Write_Command與Wire_Data

void ILI9341_Write_Command(uint8_t Command)
{
    LCD_REG=Command;
}

/* Send Data (char) to LCD */
void ILI9341_Write_Data(uint8_t Data)
{
    LCD_DATA=Data;
}

操作到這個步驟，LCD已經可以正常驅動。

不同驅動程式有些微差異性，只差在Write command與Write data的修改，若能使用GPIO驅動，改用FSMC也應該能正常驅動。

透過DMA提升顯示速度

DMA是Memory到Memory，可以將內部記憶體資料傳送給FSMC LCD接口，因為是memory到memory，所以不會占用CPU使用率。

System Core的DMA，於DMA1新增MEMTOMEM。

使用DMA主要是將資料進行搬移，所以資料移動一定會是連續的，例如將圖檔資料搬到LCD GRAM。

所以會是針對Fill Screen、Draw rect等需要連續寫入資料的function進行修改。 

HAL_DMA_Start是啟動DMA開始進行傳送

第一個參數是dam地址:&hdma_memtomem_dma1_channel1

第二個參數是要搬運資料的地址: (uint32_t)&SRC_RED_Buffer

第三個參數是FSMC Write data的地址:(uint32_t)&LCD_DATA

第四個是資料長度:640 (最大值為65535)

HAL_DMA_Start(&hdma_memtomem_dma1_channel1, (uint32_t)&SRC_RED_Buffer, (uint32_t)&LCD_DATA,640);
HAL_DMA_PollForTransfer(&hdma_memtomem_dma1_channel1, HAL_DMA_FULL_TRANSFER, 1000);

下面是自行定義一個1*320的橫線，再透過DMA傳輸480次填滿整個畫面，顯示速度約15FPS。

#define BUFFER_SIZE 640
const uint8_t SRC_RED_Buffer[BUFFER_SIZE] = {        0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00,0xF8,0x00};

修改範例如下

void ILI9341_Fill_Screen(uint16_t Colour)
{

    ILI9341_Set_Address(0,0,LCD_WIDTH-1,LCD_HEIGHT-1);
    ILI9341_Write_Command(0x2C);
    uint32_t img_size=LCD_WIDTH*LCD_HEIGHT;
    uint32_t img_page=img_size/(640/2);//(8bit 640 need /2 = 16bit color)

    for(uint16_t i=0;i<=img_page;i++){
            HAL_StatusTypeDef DMA_status = HAL_ERROR;
            HAL_DMA_Start(&hdma_memtomem_dma1_channel1, (uint32_t)&SRC_RED_Buffer, (uint32_t)&LCD_DATA,640);
            HAL_DMA_PollForTransfer(&hdma_memtomem_dma1_channel1, HAL_DMA_FULL_TRANSFER, 1000);
    }
}