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单片机与RA8875接法及软件初始化之二(通过串口连接) 作者:david   发表日期:2020-10-22   来源:   浏览:

本篇文章主要介绍使用硬件SPI/IIC以及IO口模拟SPI/IIC方式驱动RA8875

一、硬件设计
            单片机引脚
        
       
         RA8875引脚
       

            


二、软件设计

1、硬件SPI        //硬件IIC与SPI都属于STM32资源,初始化原理相同这里不做一 一阐述,以SPI为例
 初始化

static void SPI_Mode_Config(void)

{
  SPI_InitTypeDef  SPI_InitStructure; 
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1 ,ENABLE);
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_16 ;  //时钟分频因子
//SPI 使用模式3
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge ;
SPI_InitStructure.SPI_CPOL = SPI_CPOL_High ;
SPI_InitStructure.SPI_CRCPolynomial = 7;//不使用CRC功能,数值随便写 //设置CRC校验的表达方式
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex ;//双线全双工
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB  ;
SPI_InitStructure.SPI_Mode = SPI_Mode_Master  ;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft  ;
SPI_Init(FLASH_SPIx,&SPI_InitStructure); //写入配置到寄存器
SPI_Cmd(FLASH_SPIx,ENABLE);//使能SPI
}


    写和读函数
void LCD_CmdWrite(uint8_t cmd)
{
   Flash_cs_low();
SPI_Peripheral_SendByte(0x80); 
SPI_Peripheral_SendByte(cmd); 
Flash_cs_high();
}
 
 
void LCD_DataWrite(uint8_t Data)
{
    Flash_cs_low();
SPI_Peripheral_SendByte(0x00); 
SPI_Peripheral_SendByte(Data); 
Flash_cs_high();
}
 
 
uint8_t LCD_DataRead(void)
{
   uint8_t Data;
 
Flash_cs_low();
SPI_Peripheral_SendByte(0x40); 
    Data=SPI_Peripheral_ReadByte();
Flash_cs_high();
return Data;
 
 
uint8_t LCD_StatusRead(void)
{
uint8_t Data;
 
Flash_cs_low();
SPI_Peripheral_SendByte(0xc0); 
    Data=SPI_Peripheral_ReadByte();
Flash_cs_high();
return Data;

}


2、普通IO口模拟SPI     //3线SPI与4线SPI皆可驱动,3线模式时芯片引脚SDI不适用接至VDD,SDO作为数据传输脚
    SPI时序

  void SPI_Delay(void)
{
unsigned char t;
t=100;    //Adjusted by different
while(--t!=0);
}
void SPI_Init(void)
{
SCK = 1;
SDA = 1;
 ZCS = 1;
}

void SPI_Write(unsigned char dat)
{
    unsigned char t = 8;
  do
  {
  SDA = (bit)(dat & 0x80);
  dat <<= 1;
  SCK = 0; 
                SPI_Delay();
  SCK = 1;
                SPI_Delay();
 
  } while ( --t != 0 );
SCK = 1;
SDA = 1;
}

unsigned char SPI_Read()          //当以4线方式驱动时SDA应改为SDO
{
   unsigned char dat;
   unsigned char t = 8;
 SDA = 1; //SET SDA=1 is let this singal keeping in input mode before read data
 do
 {
  SDA = 1; //SET SDA=1 is let this singal keeping in input mode before read data
  SCK = 0; 
  SPI_Delay();
  dat <<= 1;
  if ( SDA ) dat++;
  SCK = 1;
SPI_Delay();
} while ( --t != 0 );
return dat;
}
void LCD_CmdWrite(uchar cmd)
   SCK = 1; 
   SDA = 1; 
   ZCS = 0;
   SPI_Delay();
   SPI_Write(0x80); 
   SPI_Write(cmd);
 
   ZCS = 1;
 
    SPI_Delay();
}
 
//----------------------//

void LCD_DataWrite(uchar Data)
{
   SCK = 1; 
   SDA = 1;  
   ZCS = 0;
   SPI_Delay();
   SPI_Write(0x00); 
   SPI_Write(Data);
   SPI_Delay();
   ZCS = 1;
    SPI_Delay();
}
 
uchar LCD_DataRead(void)
{
   uchar Data;
 
   SCK = 1; 
   SDA = 1; 
   ZCS = 0;
   SPI_Write(0x40);  
   Data = SPI_Read();
   SPI_Delay();
   ZCS = 1;
return Data;
}  
//-----------------------//
uchar LCD_StatusRead(void)
{
 uchar Data;
 
   SCK = 1; 
   SDA = 1; 
   ZCS = 0;
   SPI_Delay();
   SPI_Write(0xc0); 
 
   Data = SPI_Read();
SPI_Delay();
ZCS = 1;
return Data;
}
   
  初始化芯片及配置相关时钟频率
 
GPIO_ResetBits(GPIOB, GPIO_Pin_7);
    delay_ms(1);   
    GPIO_SetBits(GPIOB, GPIO_Pin_7);
    delay_ms(1);
 
//RA8875_PLL_ini();
LCD_CmdWrite(0x88);       
    LCD_DataWrite(0x0b);
    delay_ms(1);    
    LCD_CmdWrite(0x89);       
    LCD_DataWrite(0x02);  
    delay_ms(1);
 
  LCD_CmdWrite(0x10);  //SYSR   bit[4:3]=00 256 color  bit[2:1]=  00 8bit MPU interface
    //LCD_DataWrite(0x000c);   // if 8bit MCU interface   and 65k color display      
   LCD_DataWrite(0x0F); // if 16bit MCU interface   and 65k color display  
delay_us(1); 
 
LCD_CmdWrite(0x04);     //PCLK inverse 
   LCD_DataWrite(0x81);
delay_ms(1);


液晶屏相关配置    (以AT070TN92为例)

//Horizontal set
   LCD_CmdWrite(0x14); //HDWR//Horizontal Display Width Setting Bit[6:0]                   
   LCD_DataWrite(0x63);//Horizontal display width(pixels) = (HDWR + 1)*8 
                   
   LCD_CmdWrite(0x15); //Horizontal Non-Display Period Fine Tuning Option Register (HNDFTR)
   LCD_DataWrite(0x03);//Horizontal Non-Display Period Fine Tuning(HNDFT) [3:0]   
          
   LCD_CmdWrite(0x16); //HNDR//Horizontal Non-Display Period Bit[4:0]                      
   LCD_DataWrite(0x03);//Horizontal Non-Display Period (pixels) = (HNDR + 1)*8 
             
   LCD_CmdWrite(0x17); //HSTR//HSYNC Start Position[4:0]                                   
   LCD_DataWrite(0x02);//HSYNC Start Position(PCLK) = (HSTR + 1)*8    
                     
   LCD_CmdWrite(0x18); //HPWR//HSYNC Polarity ,The period width of HSYNC.                  
   LCD_DataWrite(0x00);//HSYNC Width [4:0]   HSYNC Pulse width(PCLK) = (HPWR + 1)*8   
 
   //Vertical set    
   LCD_CmdWrite(0x19); //VDHR0 //Vertical Display Height Bit [7:0]                         
   LCD_DataWrite(0xdf);//Vertical pixels = VDHR + 1       
                                 
   LCD_CmdWrite(0x1a); //VDHR1 //Vertical Display Height Bit [8]                           
   LCD_DataWrite(0x01);//Vertical pixels = VDHR + 1  
                                      
   LCD_CmdWrite(0x1b); //VNDR0 //Vertical Non-Display Period Bit [7:0]                     
   LCD_DataWrite(0x14);//Vertical Non-Display area = (VNDR + 1) 
                           
   LCD_CmdWrite(0x1c); //VNDR1 //Vertical Non-Display Period Bit [8]                       
   LCD_DataWrite(0x00);//Vertical Non-Display area = (VNDR + 1)  
                          
   LCD_CmdWrite(0x1d); //VSTR0 //VSYNC Start Position[7:0]                                 
   LCD_DataWrite(0x06);//VSYNC Start Position(PCLK) = (VSTR + 1)  
                          
   LCD_CmdWrite(0x1e); //VSTR1 //VSYNC Start Position[8]                                   
   LCD_DataWrite(0x00);//VSYNC Start Position(PCLK) = (VSTR + 1)   
                        
   LCD_CmdWrite(0x1f); //VPWR //VSYNC Polarity ,VSYNC Pulse Width[6:0]                     
   LCD_DataWrite(0x01);//VSYNC Pulse Width(PCLK) = (VPWR + 1)                              
 
   LCD_CmdWrite(0xf2);  
   LCD_DataWrite(0x01);
//Active window  set 
   //setting active window X
    LCD_CmdWrite(0x30); //Horizontal Start Point 0 of Active Window (HSAW0)
    LCD_DataWrite(0x00); //Horizontal Start Point of Active Window [7:0]
//delay_us(1); 
    LCD_CmdWrite(0x31); //Horizontal Start Point 1 of Active Window (HSAW1)   
    LCD_DataWrite(0x00); //Horizontal Start Point of Active Window [9:8]
//delay_us(1); 
    LCD_CmdWrite(0x34); //Horizontal End Point 0 of Active Window (HEAW0)
    LCD_DataWrite(0x1F); //Horizontal End Point of Active Window [7:0]
//delay_us(1); 
    LCD_CmdWrite(0x35); //Horizontal End Point 1 of Active Window (HEAW1)   
    LCD_DataWrite(0x03); //Horizontal End Point of Active Window [9:8]
//delay_us(1); 
 
   //setting active window Y
    LCD_CmdWrite(0x32); //Vertical Start Point 0 of Active Window (VSAW0)
    LCD_DataWrite(0x00); //Vertical Start Point of Active Window [7:0]
//delay_us(1); 
    LCD_CmdWrite(0x33); //Vertical Start Point 1 of Active Window (VSAW1)   
    LCD_DataWrite(0x00); //Vertical Start Point of Active Window [8]
//delay_us(1); 
    LCD_CmdWrite(0x36); //Vertical End Point of Active Window 0 (VEAW0)
    LCD_DataWrite(0xdf); //Vertical End Point of Active Window [7:0]
//delay_us(1); 
    LCD_CmdWrite(0x37); //Vertical End Point of Active Window 1 (VEAW1)   
    LCD_DataWrite(0x01); //Vertical End Point of Active Window [8]
 
// /*setting RA8875 display on*/
    LCD_CmdWrite(0x01); //  
    LCD_DataWrite(0x80); // 
    delay_ms(20);


至此RA8875初始化完成。  
  

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