STM32 SPI+DMA刷LCD屏

STM32---SPI通信的总结(库函数操作)

 

 

参考代码：

void SPI_GPIO_Init(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    SPI_InitTypeDef  SPI_InitStructure;
     
    NVIC_InitTypeDef NVIC_InitStructure;
       
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE );//PORTB时钟使能 
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2,  ENABLE );//SPI2时钟使能 
    
    /* DMA1 clock enable */
    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, DISABLE);
    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
    
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;  //PB13/14/15复用推挽输出 
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOB, &GPIO_InitStructure);//初始化GPIOB
    
    GPIO_SetBits(GPIOB,GPIO_Pin_13|GPIO_Pin_14|GPIO_Pin_15);  //PB13/14/15上拉
    
    SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;  //设置SPI单向或者双向的数据模式:SPI设置为双线双向全双工
    SPI_InitStructure.SPI_Mode = SPI_Mode_Master;        //设置SPI工作模式:设置为主SPI
    SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;        //设置SPI的数据大小:SPI发送接收8位帧结构
    SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;        //串行同步时钟的空闲状态为高电平
    SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;    //串行同步时钟的第二个跳变沿（上升或下降）数据被采样
    SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;        //NSS信号由硬件（NSS管脚）还是软件（使用SSI位）管理:内部NSS信号有SSI位控制
    SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_2;        //定义波特率预分频的值:波特率预分频值为256
    SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;    //指定数据传输从MSB位还是LSB位开始:数据传输从MSB位开始
    SPI_InitStructure.SPI_CRCPolynomial = 7;    //CRC值计算的多项式
    SPI_Init(SPI2, &SPI_InitStructure);  //根据SPI_InitStruct中指定的参数初始化外设SPIx寄存器

    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
    NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel5_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
    
    //SPI_I2S_DMACmd(SPI2, SPI_I2S_DMAReq_Tx, DISABLE);
    SPI_Cmd(SPI2, ENABLE);          
} 

void DMA_LCD_Send( const UINT8 *ptdate,UINT16 len)
{
    DMA_InitTypeDef  DMA_InitStructure;

    OLED_DC_Set();//写数据
    OLED_CS_Clr();
    DMA_DeInit(DMA1_Channel5);
    DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&SPI2->DR;
    DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)ptdate;//SPI2_Tx_Buf;
    DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
    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_Medium;
    DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
    DMA_Init(DMA1_Channel5, &DMA_InitStructure);
    DMA_Cmd(DMA1_Channel5, DISABLE );  //关闭DMA1 所指示的通道      
    
    DMA_SetCurrDataCounter(DMA1_Channel5,len);//DMA通道的DMA缓存的大小
    //DMA_ClearFlag(DMA1_FLAG_TC5);//清除通道传输完成标志  
    DMA_ClearITPendingBit(DMA1_IT_TC5);

    SPI_I2S_DMACmd(SPI2, SPI_I2S_DMAReq_Tx, ENABLE);
    DMA_ITConfig(DMA1_Channel5, DMA_IT_TC, ENABLE); 
    DMA_Cmd(DMA1_Channel5, ENABLE);  //使能USART1 TX DMA1 所指示的通道 
    
    //while(RESET == DMA_GetFlagStatus(DMA1_FLAG_TC5));    //判断通道传输完成
    //DMA_ClearFlag(DMA1_FLAG_TC5);//清除通道传输完成标志
} 

void DMA1_Channel5_IRQHandler(void) 
{
    if (DMA_GetITStatus(DMA1_IT_TC5)) {
        DMA_ClearITPendingBit(DMA1_IT_TC5);
        //DMA_Cmd(DMA1_Channel5, DISABLE);
        OLED_CS_Set();
    }
}

LCD刷一张图：

image_100是图片数组：

void LCD_ShowPicture_50(UINT16 x,UINT16 y)
{
    //UINT8 *pt=&image_100[0];
    LCD_Address_Set(x,y,x+99,y+99);
    
    DMA_LCD_Send(&image_100[0],20000);            
}