STM32F4VET6使用硬件SPI+DMA驱动st7735s

STM32F4VET6使用硬件SPI+DMA驱动st7735s

①配置SPI和GPIO

SPI.h

void SPI2_Init(void);
u8 SPI_WriteByte(SPI_TypeDef* SPIx,u8 Byte);

SPI.c

//SPI和GPIO初始化
void SPI2_Init(void)
{SPI_InitTypeDef SPI_InitStructure;GPIO_InitTypeDef GPIO_InitStructure;RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB,ENABLE);RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2,ENABLE);//设置GPIOB_Pin13为SCL,设置GPIOB_Pin15为SDAGPIO_InitStructure.GPIO_Pin=GPIO_Pin_13|GPIO_Pin_15;GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF;GPIO_InitStructure.GPIO_OType=GPIO_OType_PP;GPIO_InitStructure.GPIO_PuPd=GPIO_PuPd_UP;GPIO_InitStructure.GPIO_Speed=GPIO_Speed_100MHz;GPIO_Init(GPIOB,&GPIO_InitStructure);GPIO_PinAFConfig(GPIOB,GPIO_PinSource13,GPIO_AF_SPI2);GPIO_PinAFConfig(GPIOB,GPIO_PinSource15,GPIO_AF_SPI2);RCC_APB2PeriphResetCmd(RCC_APB1Periph_SPI2,ENABLE);RCC_APB2PeriphResetCmd(RCC_APB1Periph_SPI2,DISABLE);//设置GPIOB_Pin10为DC,设置GPIOB_Pin12为CSGPIO_InitStructure.GPIO_Pin=GPIO_Pin_10|GPIO_Pin_12;GPIO_InitStructure.GPIO_Mode=GPIO_Mode_OUT;GPIO_InitStructure.GPIO_PuPd=GPIO_PuPd_UP;GPIO_InitStructure.GPIO_OType=GPIO_OType_PP;GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;GPIO_Init(GPIOB,&GPIO_InitStructure);SPI_InitStructure.SPI_BaudRatePrescaler=SPI_BaudRatePrescaler_2;SPI_InitStructure.SPI_CPHA=SPI_CPHA_1Edge;SPI_InitStructure.SPI_CPOL=SPI_CPOL_Low;SPI_InitStructure.SPI_CRCPolynomial=7;SPI_InitStructure.SPI_DataSize=SPI_DataSize_8b;SPI_InitStructure.SPI_Direction=SPI_Direction_2Lines_FullDuplex;SPI_InitStructure.SPI_FirstBit=SPI_FirstBit_MSB;SPI_InitStructure.SPI_Mode=SPI_Mode_Master;SPI_InitStructure.SPI_NSS=SPI_NSS_Soft;SPI_Init(SPI2,&SPI_InitStructure);SPI_Cmd(SPI2,ENABLE);
}//硬件SPI写字节
u8 SPI_WriteByte(SPI_TypeDef* SPIx,u8 Byte)
{while((SPIx->SR&SPI_I2S_FLAG_TXE)==RESET);SPIx->DR=Byte;while((SPIx->SR&SPI_I2S_FLAG_RXNE)==RESET);return SPIx->DR;
}

②配置DMA

DMA.h

void MYDMA_Config(DMA_Stream_TypeDef* DMA_CHx,u32 cpar,u32 cmar,u16 cndtr);
void MYDMA_Enable(DMA_Stream_TypeDef*DMA_CHx);
void DMA_GO(void);

DMA.c

u32 DMA1_MEM_LEN;
extern u8 SendBuff[2*128];//全局设置SendBuff缓冲区
DMA_InitTypeDef DMA_InitStructure;void MYDMA_Config(DMA_Stream_TypeDef* DMA_CHx,u32 cpar,u32 cmar,u16 cndtr)
{RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1,ENABLE);DMA_DeInit(DMA_CHx);DMA1_MEM_LEN=cndtr;DMA_InitStructure.DMA_Channel=DMA_Channel_0;DMA_InitStructure.DMA_Memory0BaseAddr=cmar;DMA_InitStructure.DMA_PeripheralBaseAddr=cpar;DMA_InitStructure.DMA_DIR=DMA_DIR_MemoryToPeripheral;DMA_InitStructure.DMA_BufferSize=cndtr;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_FIFOMode=DMA_FIFOMode_Disable;DMA_InitStructure.DMA_FIFOThreshold=DMA_FIFOThreshold_Full;DMA_InitStructure.DMA_MemoryBurst=DMA_MemoryBurst_Single;DMA_InitStructure.DMA_PeripheralBurst=DMA_PeripheralBurst_Single;DMA_Init(DMA_CHx,&DMA_InitStructure);
}
void MYDMA_Enable(DMA_Stream_TypeDef*DMA_CHx)
{DMA_Cmd(DMA_CHx,DISABLE);while (DMA_GetCmdStatus(DMA1_Stream4)!= DISABLE){}DMA_SetCurrDataCounter(DMA1_Stream4,DMA1_MEM_LEN);DMA_Cmd(DMA_CHx,ENABLE);
}
void DMA_GO(void)
{CS_Low;RS_High;SPI_I2S_DMACmd(SPI2,SPI_I2S_DMAReq_Tx,ENABLE);MYDMA_Enable(DMA1_Stream4);while(1){if(DMA_GetFlagStatus(DMA1_Stream4,DMA_FLAG_TCIF4)!=RESET){DMA_ClearFlag(DMA1_Stream4,DMA_FLAG_TCIF4);break;}}
}

DMA刷屏

void LCD_CL_DMA(u16 Color);

void LCD_CL_DMA(u16 Color)
{DMA1_MEM_LEN=2*128;//DMA数据缓冲区大小LCD_SetWindow(0,0,127,159);RS_High;for(u16 j=0;j<2*128;){SendBuff[j]=Color>>8;SendBuff[j+1]=Color;j+=2;}for(u16 i=0;i<160;i++){DMA_GO();}
}

st7735头文件

//引脚宏定义
#define SCL GPIO_Pin_13
#define SDA GPIO_Pin_15
#define RS GPIO_Pin_10
#define CS GPIO_Pin_12//管脚高低电平切换
#define SCL_Low GPIO_ResetBits(GPIOB,GPIO_Pin_13)
#define SDA_Low GPIO_ResetBits(GPIOB,GPIO_Pin_15)
#define RS_Low GPIO_ResetBits(GPIOB,GPIO_Pin_10)
#define CS_Low GPIO_ResetBits(GPIOB,GPIO_Pin_12)#define SCL_High GPIO_SetBits(GPIOB,GPIO_Pin_13)
#define SDA_High GPIO_SetBits(GPIOB,GPIO_Pin_15)
#define RS_High GPIO_SetBits(GPIOB,GPIO_Pin_10)
#define CS_High GPIO_SetBits(GPIOB,GPIO_Pin_12)//颜色代码
#define RED  	0xf800
#define GREEN	0x07e0
#define BLUE 	0x001f
#define WHITE	0xffff
#define BLACK	0x0000
#define YELLOW  0xFFE0
#define GRAY0   0xEF7D
#define GRAY1   0x8410 
#define GRAY2   0x4208typedef struct
{u16 width;			//LCD 宽度u16 height;		//LCD 高度
}_lcd_dev;extern _lcd_dev lcd_setting;void LCD_Init(void);
void WR_Cmd(u8 Cmd);
void WR_Data(u8 Data);
void WR_Data16(u16 Data);
void WR_Reg(u8 Cmd,u16 Data);
void LCD_RESET(void);//复位
void LCD_SetPos(u16 X,u16 Y);//设置光标位置
void LCD_SetWindow(u16 XS,u16 YS,u16 XE,u16 YE);//设置显示窗口并准备写入数据
void LCD_Clear(u16 Color);//硬件SPI刷屏

③初始化st7735

_lcd_dev lcd_setting;//LCD参数
u8 SendBuff[2*128];//调用DMA的SendBuffvoid LCD_Init(void)
{SPI2_Init();			 LCD_RESET();RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1,ENABLE);MYDMA_Config(DMA1_Stream4,(u32)&SPI2->DR,(u32)SendBuff,2*128);//************* Start Initial Sequence **********//		WR_Cmd(0x11);//Sleep exit delay_ms (120);		
//ST7735R Frame RateWR_Cmd(0xB1); WR_Data(0x01); WR_Data(0x2C); WR_Data(0x2D); WR_Cmd(0xB2); WR_Data(0x01); WR_Data(0x2C); WR_Data(0x2D); WR_Cmd(0xB3); WR_Data(0x01); WR_Data(0x2C); WR_Data(0x2D); WR_Data(0x01); WR_Data(0x2C); WR_Data(0x2D); WR_Cmd(0xB4); //Column inversion WR_Data(0x07); //ST7735R Power SequenceWR_Cmd(0xC0); WR_Data(0xA2); WR_Data(0x02); WR_Data(0x84); WR_Cmd(0xC1); WR_Data(0xC5); WR_Cmd(0xC2); WR_Data(0x0A); WR_Data(0x00); WR_Cmd(0xC3); WR_Data(0x8A); WR_Data(0x2A); WR_Cmd(0xC4); WR_Data(0x8A); WR_Data(0xEE); WR_Cmd(0xC5); //VCOM WR_Data(0x0E); WR_Cmd(0x36); //MX, MY, RGB mode 				 WR_Data(0xC8); //ST7735R Gamma SequenceWR_Cmd(0xe0); WR_Data(0x0f); WR_Data(0x1a); WR_Data(0x0f); WR_Data(0x18); WR_Data(0x2f); WR_Data(0x28); WR_Data(0x20); WR_Data(0x22); WR_Data(0x1f); WR_Data(0x1b); WR_Data(0x23); WR_Data(0x37); WR_Data(0x00); 	WR_Data(0x07); WR_Data(0x02); WR_Data(0x10); WR_Cmd(0xe1); WR_Data(0x0f); WR_Data(0x1b); WR_Data(0x0f); WR_Data(0x17); WR_Data(0x33); WR_Data(0x2c); WR_Data(0x29); WR_Data(0x2e); WR_Data(0x30); WR_Data(0x30); WR_Data(0x39); WR_Data(0x3f); WR_Data(0x00); WR_Data(0x07); WR_Data(0x03); WR_Data(0x10);  WR_Cmd(0x2a);WR_Data(0x00);WR_Data(0x00);WR_Data(0x00);WR_Data(0x7f);WR_Cmd(0x2b);WR_Data(0x00);WR_Data(0x00);WR_Data(0x00);WR_Data(0x9f);WR_Cmd(0xF0); //Enable test command  WR_Data(0x01); WR_Cmd(0xF6); //Disable ram power save mode WR_Data(0x00); WR_Cmd(0x3A); //65k mode WR_Data(0x05); 	WR_Cmd(0x29);//Display on	lcd_setting.width=128;//设置宽度lcd_setting.height=160;//设置高度WR_Reg(0x36,0xA8);
}

各种LCD必要函数

//写指令
void WR_Cmd(u8 Cmd)
{CS_Low;RS_Low;SPI_WriteByte(SPI2,Cmd);CS_High;
}
//写数据
void WR_Data(u8 Data)
{CS_Low;RS_High;SPI_WriteByte(SPI2,Data);CS_High;
}
//写16位数据（颜色）
void WR_Data16(u16 Data)
{CS_Low;RS_High;SPI_WriteByte(SPI2,Data>>8);SPI_WriteByte(SPI2,Data);CS_High;
}
//同时写指令和数据
void WR_Reg(u8 Cmd,u16 Data)
{WR_Cmd(Cmd);WR_Data16(Data);
}
//复位
void LCD_RESET(void)
{delay_ms(100);delay_ms(50);
}
//设置光标位置
void LCD_SetPos(u16 X,u16 Y)
{LCD_SetWindow(X,Y,X,Y);
}
//设置显示窗口
void LCD_SetWindow(u16 XS,u16 YS,u16 XE,u16 YE)
{WR_Cmd(0x2A);WR_Data(XS>>8);WR_Data(XS);WR_Data(XE>>8);WR_Data(XE);WR_Cmd(0x2B);WR_Data(YS>>8);WR_Data(YS);WR_Data(YE>>8);WR_Data(YE);WR_Cmd(0x2C);
}

硬件SPI刷屏

void LCD_Clear(u16 Color)
{u16 i,j;
LCD_SetWindow(0,0,lcd_setting.width-1,lcd_setting.height-1);	  for(i=0;i<lcd_setting.width;i++){for(j=0;j<lcd_setting.height;j++)WR_Data16(Color);	//写入数据 	 }}

main.c

int main(void)
{delay_init(168);LCD_Init();LCD_Clear(WHITE);while(1){LCD_CL_DMA(RED);LCD_CL_DMA(BLUE);LCD_CL_DMA(GREEN);//LCD_Clear(RED);//LCD_Clear(BLUE);//LCD_Clear(GREEN);}
}

效果视频：

SPI STM32F407VET6学习笔记

SPI+DMA STM32F407VET6学习笔记

 踩坑地方：

初始化屏幕函数不对

写指令要先拉低CS和DC,写数据就要拉低CS,拉高DC，写完都要拉高CS

配置DMA要注意流和道的说明

如F4的说明指南：

现在我的代码使用的是SPI2的DMA1

所以要设置成DMA1_Stream4和DMA1_Channel0才可以正常使用

F4框图：

如图可以知道你配置RCC_AxBxPeriphClockCmd()；AxBx所对应的线

文中配置的SPI2就得使用APB1的时钟使能

其他如DMA,I2C,USART等等都是如此时钟使能再进行管脚配置初始化

F4管脚图：

如图中的SPI2定义的管脚为PB12—PB15

在管脚定义的时候就使能GPIOB和SPI2，然后把GPIOB的管脚GPIO_Pin配置成对应的12—15

SPI2，DMA根据所需来配置