STM32G030驱动一款TFT屏，图片浏览，使用SPI + DMA + flash , 触摸按键 ucGUI , 请写相关代码

由于代码比较长，我将分为多个部分来介绍。

1. 引脚定义和初始化

首先需要定义TFT屏幕的引脚，并初始化SPI和DMA的相关配置。

#define TFT_RST_PIN GPIO_Pin_0
#define TFT_DC_PIN GPIO_Pin_1
#define TFT_CS_PIN GPIO_Pin_2

#define TFT_SPI SPI1
#define TFT_DMA DMA1_Channel3

#define TFT_WIDTH 240
#define TFT_HEIGHT 320

void TFT_GPIO_Init(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
    
    GPIO_InitStructure.GPIO_Pin = TFT_RST_PIN | TFT_DC_PIN | TFT_CS_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);
    
    GPIO_SetBits(GPIOA, TFT_RST_PIN | TFT_DC_PIN | TFT_CS_PIN);
}

void TFT_SPI_Init(void)
{
    SPI_InitTypeDef SPI_InitStructure;
    
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
    
    SPI_InitStructure.SPI_Direction = SPI_Direction_1Line_Tx;
    SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
    SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
    SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
    SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
    SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
    SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_4;
    SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
    SPI_InitStructure.SPI_CRCPolynomial = 7;
    SPI_Init(TFT_SPI, &SPI_InitStructure);
    
    SPI_Cmd(TFT_SPI, ENABLE);
}

void TFT_DMA_Init(void)
{
    DMA_InitTypeDef DMA_InitStructure;
    
    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
    
    DMA_DeInit(TFT_DMA);
    DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&(TFT_SPI->DR);
    DMA_InitStructure.DMA_MemoryBaseAddr = 0;
    DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
    DMA_InitStructure.DMA_BufferSize = 0;
    DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
    DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
    DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
    DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
    DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
    DMA_InitStructure.DMA_Priority = DMA_Priority_High;
    DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
    DMA_Init(TFT_DMA, &DMA_InitStructure);
    
    DMA_ITConfig(TFT_DMA, DMA_IT_TC, ENABLE);
    NVIC_EnableIRQ(DMA1_Channel3_IRQn);
}

2. TFT屏幕驱动

接下来是TFT屏幕的驱动代码，包括写命令、写数据等。

void TFT_WriteCmd(uint8_t cmd)
{
    GPIO_ResetBits(GPIOA, TFT_DC_PIN);
    GPIO_ResetBits(GPIOA, TFT_CS_PIN);
    
    SPI_I2S_SendData(TFT_SPI, cmd);
    while (SPI_I2S_GetFlagStatus(TFT_SPI, SPI_I2S_FLAG_BSY) == SET);
    
    GPIO_SetBits(GPIOA, TFT_CS_PIN);
}

void TFT_WriteData(uint8_t data)
{
    GPIO_SetBits(GPIOA, TFT_DC_PIN);
    GPIO_ResetBits(GPIOA, TFT_CS_PIN);
    
    SPI_I2S_SendData(TFT_SPI, data);
    while (SPI_I2S_GetFlagStatus(TFT_SPI, SPI_I2S_FLAG_BSY) == SET);
    
    GPIO_SetBits(GPIOA, TFT_CS_PIN);
}

void TFT_WriteWord(uint16_t data)
{
    uint8_t byte1 = (uint8_t)(data >> 8);
    uint8_t byte2 = (uint8_t)(data & 0xFF);
    
    TFT_WriteData(byte1);
    TFT_WriteData(byte2);
}

void TFT_SetAddrWindow(uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1)
{
    TFT_WriteCmd(0x2A);
    TFT_WriteWord(x0);
    TFT_WriteWord(x1);
    
    TFT_WriteCmd(0x2B);
    TFT_WriteWord(y0);
    TFT_WriteWord(y1);
    
    TFT_WriteCmd(0x2C);
}

3. DMA传输

接下来是DMA传输的代码，用于将图片数据从flash中读取并传输到TFT屏幕中。

void TFT_DMA_Transfer(uint16_t *data, uint32_t count)
{
    DMA_Cmd(TFT_DMA, DISABLE);
    while (DMA_GetFlagStatus(DMA1_FLAG_TC3) == RESET);
    DMA_ClearFlag(DMA1_FLAG_TC3);
    
    DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)data;
    DMA_InitStructure.DMA_BufferSize = count;
    DMA_Init(TFT_DMA, &DMA_InitStructure);
    
    DMA_Cmd(TFT_DMA, ENABLE);
}

void TFT_DMA_TransferImage(uint32_t addr)
{
    uint32_t size = TFT_WIDTH * TFT_HEIGHT * 2;
    uint16_t *data = (uint16_t *)addr;
    
    for (uint32_t i = 0; i < size; i += 1024) {
        TFT_DMA_Transfer(&data[i], 1024);
    }
}

4. UC GUI

最后是使用UC GUI的代码，用于处理触摸按键和显示图片。

#include "GUI.h"
#include "DIALOG.h"

#define ID_BUTTON_EXIT 1

static void _cbDialog(WM_MESSAGE * pMsg)
{
    WM_HWIN hItem;
    int     NCode;
    int     Id;
    
    switch (pMsg->MsgId) {
        case WM_INIT_DIALOG:
            hItem = BUTTON_CreateEx(200, 280, 40, 40, pMsg->hWin, WM_CF_SHOW, 0, ID_BUTTON_EXIT);
            BUTTON_SetFont(hItem, GUI_FONT_16B_ASCII);
            BUTTON_SetText(hItem, "X");
            break;
        case WM_NOTIFY_PARENT:
            Id = WM_GetId(pMsg->hWinSrc);
            NCode = pMsg->Data.v;
            switch (Id) {
                case ID_BUTTON_EXIT:
                    switch (NCode) {
                        case WM_NOTIFICATION_CLICKED:
                            GUI_EndDialog(pMsg->hWin, 0);
                            break;
                    }
                    break;
            }
            break;
        default:
            WM_DefaultProc(pMsg);
            break;
    }
}

void TFT_ShowImage(uint32_t addr)
{
    GUI_Init();
    WM_SetCallback(WM_HBKWIN, &WM_DefaultProc);
    
    WM_HWIN hWin = GUI_CreateDialogBox(_aDialogCreate, GUI_COUNTOF(_aDialogCreate), _cbDialog, 0, 0, 0);
    WM_SetFocus(hWin);
    
    TFT_SetAddrWindow(0, 0, TFT_WIDTH - 1, TFT_HEIGHT - 1);
    TFT_DMA_TransferImage(addr);
    
    while (GUI_Exec()) {
        // 处理触摸按键
    }
}

以上是整个驱动TFT屏幕的代码，其中还需要根据具体情况进行一些调整和修改。