帮我写stm32 标准库 TFTLCD按键可以功能翻页代码

好的，下面是一个使用STM32标准库实现TFTLCD屏幕滚动显示，并且按键可以翻页的示例代码，仅供参考：

#include "stm32f10x.h"
#include "stm32f10x_dma.h"
#include "stm32f10x_gpio.h"
#include "stm32f10x_rcc.h"
#include "stm32f10x_spi.h"
#include "stm32f10x_exti.h"

#define TFTLCD_WIDTH    240
#define TFTLCD_HEIGHT   320

#define TFTLCD_DC_PIN   GPIO_Pin_2
#define TFTLCD_DC_PORT  GPIOA
#define TFTLCD_CS_PIN   GPIO_Pin_4
#define TFTLCD_CS_PORT  GPIOA
#define TFTLCD_RST_PIN  GPIO_Pin_5
#define TFTLCD_RST_PORT GPIOA

#define KEY_UP_PIN      GPIO_Pin_8
#define KEY_UP_PORT     GPIOB
#define KEY_DOWN_PIN    GPIO_Pin_9
#define KEY_DOWN_PORT   GPIOB

uint16_t TFTLCD_Buffer1[TFTLCD_WIDTH * TFTLCD_HEIGHT];
uint16_t TFTLCD_Buffer2[TFTLCD_WIDTH * TFTLCD_HEIGHT];
uint16_t *TFTLCD_Buffer_Read = TFTLCD_Buffer1;
uint16_t *TFTLCD_Buffer_Write = TFTLCD_Buffer2;

void TFTLCD_Init(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    SPI_InitTypeDef SPI_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1 | RCC_APB2Periph_GPIOA, ENABLE);

    GPIO_InitStructure.GPIO_Pin = TFTLCD_DC_PIN | TFTLCD_CS_PIN | TFTLCD_RST_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(TFTLCD_DC_PORT, &GPIO_InitStructure);

    SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
    SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
    SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
    SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
    SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
    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(SPI1, &SPI_InitStructure);

    SPI_Cmd(SPI1, ENABLE);
}

void TFTLCD_WriteData(uint8_t data)
{
    GPIO_SetBits(TFTLCD_DC_PORT, TFTLCD_DC_PIN);
    GPIO_ResetBits(TFTLCD_CS_PORT, TFTLCD_CS_PIN);
    SPI_I2S_SendData(SPI1, data);
    while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_BSY) == SET);
    GPIO_SetBits(TFTLCD_CS_PORT, TFTLCD_CS_PIN);
}

void TFTLCD_WriteCommand(uint8_t cmd)
{
    GPIO_ResetBits(TFTLCD_DC_PORT, TFTLCD_DC_PIN);
    GPIO_ResetBits(TFTLCD_CS_PORT, TFTLCD_CS_PIN);
    SPI_I2S_SendData(SPI1, cmd);
    while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_BSY) == SET);
    GPIO_SetBits(TFTLCD_CS_PORT, TFTLCD_CS_PIN);
}

void TFTLCD_SetCursor(uint16_t x, uint16_t y)
{
    TFTLCD_WriteCommand(0x2A);
    TFTLCD_WriteData(x >> 8);
    TFTLCD_WriteData(x);
    TFTLCD_WriteData((x + TFTLCD_WIDTH - 1) >> 8);
    TFTLCD_WriteData(x + TFTLCD_WIDTH - 1);
    TFTLCD_WriteCommand(0x2B);
    TFTLCD_WriteData(y >> 8);
    TFTLCD_WriteData(y);
    TFTLCD_WriteData((y + TFTLCD_HEIGHT - 1) >> 8);
    TFTLCD_WriteData(y + TFTLCD_HEIGHT - 1);
    TFTLCD_WriteCommand(0x2C);
}

void TFTLCD_FillScreen(uint16_t color)
{
    uint32_t i;

    TFTLCD_SetCursor(0, 0);
    for (i = 0; i < TFTLCD_WIDTH * TFTLCD_HEIGHT; i++) {
        TFTLCD_WriteData(color >> 8);
        TFTLCD_WriteData(color);
    }
}

void TFTLCD_DMA_Init(void)
{
    DMA_InitTypeDef DMA_InitStructure;

    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);

    DMA_DeInit(DMA1_Channel3);
    DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&SPI1->DR;
    DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)TFTLCD_Buffer_Write;
    DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
    DMA_InitStructure.DMA_BufferSize = TFTLCD_WIDTH * TFTLCD_HEIGHT * 2;
    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(DMA1_Channel3, &DMA_InitStructure);

    DMA_ITConfig(DMA1_Channel3, DMA_IT_TC, ENABLE);

    NVIC_InitTypeDef NVIC_InitStructure;
    NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel3_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
}

void DMA1_Channel3_IRQHandler(void)
{
    DMA_ClearITPendingBit(DMA1_IT_TC3);

    uint16_t *temp = TFTLCD_Buffer_Read;
    TFTLCD_Buffer_Read = TFTLCD_Buffer_Write;
    TFTLCD_Buffer_Write = temp;

    DMA_Cmd(DMA1_Channel3, DISABLE);
    DMA_SetCurrDataCounter(DMA1_Channel3, TFTLCD_WIDTH * TFTLCD_HEIGHT * 2);
    DMA_Cmd(DMA1_Channel3, ENABLE);
}

void TFTLCD_ScrollDisplay(int16_t yOffset)
{
    uint32_t i, j;
    uint16_t *src, *dst;

    if (yOffset > 0) {
        src = TFTLCD_Buffer_Read + yOffset * TFTLCD_WIDTH;
        dst = TFTLCD_Buffer_Read;
        for (i = 0; i < TFTLCD_HEIGHT - yOffset; i++) {
            for (j = 0; j < TFTLCD_WIDTH; j++) {
                *dst++ = *src++;
            }
        }
        for (i = 0; i < TFTLCD_WIDTH * yOffset; i++) {
            *dst++ = 0;
        }
    } else if (yOffset < 0) {
        yOffset = -yOffset;
        src = TFTLCD_Buffer_Read;
        dst = TFTLCD_Buffer_Read + yOffset * TFTLCD_WIDTH;
        for (i = 0; i < TFTLCD_HEIGHT - yOffset; i++) {
            for (j = 0; j < TFTLCD_WIDTH; j++) {
                *dst++ = *src++;
            }
        }
        for (i = 0; i < TFTLCD_WIDTH * yOffset; i++) {
            *dst++ = 0;
        }
    }
}

void KEY_UP_EXTI_Init(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    EXTI_InitTypeDef EXTI_InitStructure;
    NVIC_InitTypeDef NVIC_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);

    GPIO_InitStructure.GPIO_Pin = KEY_UP_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(KEY_UP_PORT, &GPIO_InitStructure);

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);

    GPIO_EXTILineConfig(GPIO_PortSourceGPIOB, GPIO