lcd_ILI9486 读id的问题

本文详细介绍了ILI9486 LCD显示屏ID的读取过程,包括使用SPI_RGB接口、设置相关寄存器等内容,并强调了正确设置RFBH寄存器的重要性。

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      ILI9486读取ID比一般的LCD稍微繁琐,需要额外几个步骤,先记录如下:

1):使用的是SPI_RGB接口。

2):读ILI9486 datasheet,查看各个寄存器的作用,可以看到两个寄存器与此相关,第一个是regB0H,这个寄存器中的D7位即SDA_EN位控制着3/4wire serial interface selection,

     SDA_EN置0 :DIN/DOUT pin 打开,可以用作3/4线的连续接口;

    SDA_EN置1:DIN/SDA pin用作3/4线的连续接口,DOUTpin 不再使用;

第二个寄存器是regFBH;这个寄存器中包含了两个关键的地方,一个是SPI_READ_EN位即D4位,该为表示了SPI read enable。置1时表示可以进行spi read。另一个就是D2-D0位即SPI_CNT[3:0]位。这三位表示了将要对某一位寄存器读取时读这个寄存器的某一位;

3):这里需要非常注意的是:在每次进行spi read时都要重新设置RFBH寄存器一次。

4):ILI9486的寄存器读取reg是D3H,在读该寄存器之前需要设置上面的两个寄存器B0H、FBH,然后设置D3H,从里面读取ILI9486的ID,注意读取D3H的ID时是一位一位读的,比如你需要读取D3H的第2位,那么在设置FBH时,你就需要将FBH的寄存器的值置为0X0012H,此时读出的是94,下一次读取D3H的第3位时,必须要将FBH在从新设置一次,置为0X0013H,再一次读取D3H后,将会读到86,至此ILI9486的ID就被读了出来。

      该ID值的读取比较坑跌,在查看了datasheet,询问了厂商三次之后,才得到确认需要设置别的reg才能读取到正确的ID,可见很大部分的有用信息其实都在datasheet上,但是由于本人英文水平有限,对查看datasheet比较抗拒,这次是读了一个星期实在读不出来,只好仔细查看datasheet,最后解决了该问题。突然想到一句话,人都是逼出来。。。哎!


/************************************************ // //TWKJ STM32开发板 // //作者: //版本:V1.0 //修改日期:2020/06/30 //程序功能:SPI接口TFT彩屏驱动程序 //V1.0 完成基本功能 ************************************************/ #include "my_lcd_spi.h" //管理LCD重要参数 //默认为竖屏 _lcd_dev lcddev; //画笔颜色,背景颜色 Color16 FRONT_COLOR,BACK_COLOR; u16 DeviceCode; void SPIv_WriteData(u8 Data) { u8 i=0; for(i=8;i>0;i--) { if(Data&0x80) { LCD_MOSI = 1;//输出数据 } else { LCD_MOSI = 0; } LCD_CLK = 0; LCD_CLK = 1; Data<<=1; } } /***************************************************************************** * @name :void LCD_WR_REG(u8 data) * @date :2018-08-09 * @function :Write an 8-bit command to the LCD screen * @parameters :data:Command value to be written * @retvalue :None ******************************************************************************/ void LCD_WR_REG(u8 data) { LCD_CS1 = 0; LCD_DC = 0; SPIv_WriteData(data); LCD_CS1 = 1; } /***************************************************************************** * @name :void LCD_WR_DATA(u8 data) * @date :2018-08-09 * @function :Write an 8-bit data to the LCD screen * @parameters :data:data value to be written * @retvalue :None ******************************************************************************/ void LCD_WR_DATA(u8 data) { LCD_CS1 = 0; LCD_DC = 1; SPIv_WriteData(data); LCD_CS1 = 1; } /***************************************************************************** * @name :void LCD_WriteReg(u8 LCD_Reg, u16 LCD_RegValue) * @date :2018-08-09 * @function :Write data into registers * @parameters :LCD_Reg:Register address LCD_RegValue:Data to be written * @retvalue :None ******************************************************************************/ void LCD_WriteReg(u8 LCD_Reg, u16 LCD_RegValue) { LCD_WR_REG(LCD_Reg); LCD_WR_DATA(LCD_RegValue); } /***************************************************************************** * @name :void LCD_WriteRAM_Prepare(void) * @date :2018-08-09 * @function :Write GRAM * @parameters :None * @retvalue :None ******************************************************************************/ void LCD_WriteRAM_Prepare(void) { LCD_WR_REG(lcddev.wramcmd); } /***************************************************************************** * @name :void LCD_WriteData_16Bit(u16 Data) * @date :2018-08-09 * @function :Write an 16-bit command to the LCD screen * @parameters :Data:Data to be written * @retvalue :None ******************************************************************************/ void LCD_WriteData_16Bit(u16 Data) { LCD_CS1 = 0; LCD_DC = 1; SPIv_WriteData(Data>>8); SPIv_WriteData(Data); LCD_CS1 = 1; } /***************************************************************************** * @name :void LCD_DrawPoint(u16 x,u16 y) * @date :2018-08-09 * @function :Write a pixel data at a specified location * @parameters :x:the x coordinate of the pixel y:the y coordinate of the pixel * @retvalue :None ******************************************************************************/ void LCD_DrawPoint(u16 x,u16 y) { LCD_SetCursor(x,y);//设置光标位置 LCD_WriteData_16Bit(FRONT_COLOR); } /***************************************************************************** * @name :void LCD_Clear(u16 Color16) * @date :2018-08-09 * @function :Full screen filled LCD screen * @parameters :color:Filled color * @retvalue :None ******************************************************************************/ void LCD_Clear(Color16 color) { u16 i,m; LCD_SetWindows(0,0,lcddev.width-1,lcddev.height-1); for(i=0;i<lcddev.height;i++) { for(m=0;m<lcddev.width;m++) { LCD_WriteData_16Bit(color); } } } /***************************************************************************** * @name :void LCD_GPIOInit(void) * @date :2018-08-09 * @function :Initialization LCD screen GPIO * @parameters :None * @retvalue :None ******************************************************************************/ void LCD_GPIOInit(void) { u8 i; for(i=0;i<sizeof(Pins_LCD_ILI9341)/sizeof(MyPinDef);i++) { #if !defined (USE_HAL_DRIVER) GPIO_Pin_Init(Pins_LCD_ILI9341[i],GPIO_Mode_Out_PP); #else GPIO_Pin_Init(Pins_LCD_ILI9341[i],GPIO_MODE_OUTPUT_PP,GPIO_PULLUP); #endif } } /***************************************************************************** * @name :void LCD_DCET(void) * @date :2018-08-09 * @function :Reset LCD screen * @parameters :None * @retvalue :None ******************************************************************************/ void LCD_DCET(void) { LCD_RES = 0; delay_ms(100); LCD_RES = 1; delay_ms(50); } /***************************************************************************** * @name :void LCD_SetCursor(u16 Xpos, u16 Ypos) * @date :2018-08-09 * @function :Set coordinate value * @parameters :Xpos:the x coordinate of the pixel Ypos:the y coordinate of the pixel * @retvalue :None ******************************************************************************/ void LCD_SetCursor(u16 Xpos, u16 Ypos) { LCD_SetWindows(Xpos,Ypos,Xpos,Ypos); } /***************************************************************************** * @name :void LCD_SetWindows(u16 xStar, u16 yStar,u16 xEnd,u16 yEnd) * @date :2018-08-09 * @function :Setting LCD display window * @parameters :xStar:the bebinning x coordinate of the LCD display window yStar:the bebinning y coordinate of the LCD display window xEnd:the endning x coordinate of the LCD display window yEnd:the endning y coordinate of the LCD display window * @retvalue :None ******************************************************************************/ void LCD_SetWindows(u16 xStar, u16 yStar,u16 xEnd,u16 yEnd) { LCD_WR_REG(lcddev.setxcmd); LCD_WR_DATA(xStar>>8); LCD_WR_DATA(xStar+lcddev.xoffset); LCD_WR_DATA(xEnd>>8); LCD_WR_DATA(xEnd+lcddev.xoffset);//**All notes can be deleted and modified**// LCD_WR_DATA(yEnd+lcddev.yoffset); LCD_WriteRAM_Prepare(); //开始写入GRAM } /***************************************************************************** * @name :void LCD_direction(u8 direction) * @date :2018-08-09 * @function :Setting the display direction of LCD screen * @parameters :direction:0-0 degree 1-90 degree 2-180 degree 3-270 degree * @retvalue :None ******************************************************************************/ void LCD_direction(u8 direction) { lcddev.setxcmd=0x2A; lcddev.setycmd=0x2B;//**All notes can be deleted and modified**// #ifdef LCD_1_4_GREEN switch(direction){ case 0: lcddev.width=LCD_W; lcddev.height=LCD_H; #ifdef LCD_1_4 //采用1.44寸屏 lcddev.xoffset=0; lcddev.yoffset=32; #endif LCD_WriteReg(0x36,(1<<3)|(1<<6)|(1<<7));//BGR==1,MY==0,MX==0,MV==0 break; case 1: lcddev.width=LCD_H; lcddev.height=LCD_W; #ifdef LCD_1_4 //采用1.44寸屏 lcddev.xoffset=32; lcddev.yoffset=0; LCD_WriteReg(0x36,(1<<3)|(1<<7)|(1<<5));//BGR==1,MY==1,MX==0,MV==1 #endif // LCD_WriteReg(0x36,(1<<3)|(1<<7)|(1<<5));//BGR==1,MY==1,MX==0,MV==1 break; case 2: lcddev.width=LCD_W; lcddev.height=LCD_H; #ifdef LCD_1_4 //采用1.44寸屏 lcddev.xoffset=0; lcddev.yoffset=0; #endif LCD_WriteReg(0x36,(1<<3)|(0<<6)|(0<<7));//BGR==1,MY==0,MX==0,MV==0 break; case 3: lcddev.width=LCD_H; lcddev.height=LCD_W; #ifdef LCD_1_4 //采用1.44寸屏 lcddev.xoffset=0; lcddev.yoffset=0; #endif LCD_WriteReg(0x36,(1<<3)|(0<<7)|(1<<6)|(1<<5));//BGR==1,MY==1,MX==0,MV==1 break; default:break; } #else switch(direction){ case 0: lcddev.width=LCD_W; lcddev.height=LCD_H; #ifdef LCD_1_4 //采用1.44寸屏 lcddev.xoffset=2; lcddev.yoffset=3; #endif LCD_WriteReg(0x36,(1<<3)|(1<<6)|(1<<7));//BGR==1,MY==0,MX==0,MV==0 break; case 1: lcddev.width=LCD_H; lcddev.height=LCD_W; #ifdef LCD_1_4 //采用1.44寸屏 lcddev.xoffset=3; lcddev.yoffset=2; LCD_WriteReg(0x36,(1<<3)|(1<<7)|(1<<5));//BGR==1,MY==1,MX==0,MV==1 #endif LCD_WriteReg(0x36,(1<<3)|(0<<7)|(1<<5));//BGR==1,MY==1,MX==0,MV==1 break; case 2: lcddev.width=LCD_W; lcddev.height=LCD_H; #ifdef LCD_1_4 //采用1.44寸屏 lcddev.xoffset=2; lcddev.yoffset=1; #endif LCD_WriteReg(0x36,(1<<3)|(0<<6)|(0<<7));//BGR==1,MY==0,MX==0,MV==0 break; case 3: lcddev.width=LCD_H; lcddev.height=LCD_W; #ifdef LCD_1_4 //采用1.44寸屏 lcddev.xoffset=1; lcddev.yoffset=2; #endif LCD_WriteReg(0x36,(1<<3)|(0<<7)|(1<<6)|(1<<5));//BGR==1,MY==1,MX==0,MV==1 break; default:break; } #endif } /***************************************************************************** * @name :void LCD_Init(void) * @date :2018-08-09 * @function :Initialization LCD screen * @parameters :None * @retvalue :None ******************************************************************************/ void LCD_Init(void) { LCD_GPIOInit(); LCD_DCET();//LCD 复位 #ifdef LCD_1_4 //采用1.44寸屏 //************* ST7735S初始化**********// LCD_WR_REG(0x11);//Sleep exit delay_ms (120); //ST7735R Frame Rate LCD_WR_REG(0xB1); LCD_WR_DATA(0x01); LCD_WR_DATA(0x2C); LCD_WR_DATA(0x2D); LCD_WR_REG(0xB2); LCD_WR_DATA(0x01); LCD_WR_DATA(0x2C); LCD_WR_DATA(0x2D); LCD_WR_REG(0xB3); LCD_WR_DATA(0x01); LCD_WR_DATA(0x2C); LCD_WR_DATA(0x2D); LCD_WR_DATA(0x01); LCD_WR_DATA(0x2C); LCD_WR_DATA(0x2D); LCD_WR_REG(0xB4);//Column inversion LCD_WR_DATA(0x07); //ST7735R Power Sequence LCD_WR_REG(0xC0); LCD_WR_DATA(0xA2); LCD_WR_DATA(0x02); LCD_WR_DATA(0x84); LCD_WR_REG(0xC1); LCD_WR_DATA(0xC5); LCD_WR_REG(0xC2); LCD_WR_DATA(0x0A); LCD_WR_DATA(0x00); LCD_WR_REG(0xC3); LCD_WR_DATA(0x8A); LCD_WR_DATA(0x2A); LCD_WR_REG(0xC4); LCD_WR_DATA(0x8A); LCD_WR_DATA(0xEE); LCD_WR_REG(0xC5);//VCOM LCD_WR_DATA(0x0E); LCD_WR_REG(0x36);//MX, MY, RGB mode LCD_WR_DATA(0xC8); //ST7735R Gamma Sequence LCD_WR_REG(0xe0); LCD_WR_DATA(0x0f); LCD_WR_DATA(0x1a); LCD_WR_DATA(0x0f); LCD_WR_DATA(0x18); LCD_WR_DATA(0x2f); LCD_WR_DATA(0x28); LCD_WR_DATA(0x20); LCD_WR_DATA(0x22); LCD_WR_DATA(0x1f); LCD_WR_DATA(0x1b); LCD_WR_DATA(0x23); LCD_WR_DATA(0x37); LCD_WR_DATA(0x00); LCD_WR_DATA(0x07); LCD_WR_DATA(0x02); LCD_WR_DATA(0x10); LCD_WR_REG(0xe1); LCD_WR_DATA(0x0f); LCD_WR_DATA(0x1b); LCD_WR_DATA(0x0f); LCD_WR_DATA(0x17); LCD_WR_DATA(0x33); LCD_WR_DATA(0x2c); LCD_WR_DATA(0x29); LCD_WR_DATA(0x2e); LCD_WR_DATA(0x30); LCD_WR_DATA(0x30); LCD_WR_DATA(0x39); LCD_WR_DATA(0x3f); LCD_WR_DATA(0x00); LCD_WR_DATA(0x07); LCD_WR_DATA(0x03); LCD_WR_DATA(0x10); LCD_WR_REG(0x2a); LCD_WR_DATA(0x00); LCD_WR_DATA(0x00); LCD_WR_DATA(0x00); LCD_WR_DATA(0x7f); LCD_WR_REG(0x2b); LCD_WR_DATA(0x00); LCD_WR_DATA(0x00); LCD_WR_DATA(0x00); LCD_WR_DATA(0x9f); LCD_WR_REG(0xF0);//Enable test command LCD_WR_DATA(0x01); LCD_WR_REG(0xF6);//Disable ram power save mode LCD_WR_DATA(0x00); LCD_WR_REG(0x3A);//65k mode LCD_WR_DATA(0x05); #else//选择2.4寸屏 //*************2.4inch ILI9341初始化**********// LCD_WR_REG(0xCF); LCD_WR_DATA(0x00); LCD_WR_DATA(0xD9);//0xC1 LCD_WR_DATA(0X30); LCD_WR_REG(0xED); LCD_WR_DATA(0x64); LCD_WR_DATA(0x03); LCD_WR_DATA(0X12); LCD_WR_DATA(0X81); LCD_WR_REG(0xE8); LCD_WR_DATA(0x85); LCD_WR_DATA(0x10); LCD_WR_DATA(0x7A); LCD_WR_REG(0xCB); LCD_WR_DATA(0x39); LCD_WR_DATA(0x2C); LCD_WR_DATA(0x00); LCD_WR_DATA(0x34); LCD_WR_DATA(0x02); LCD_WR_REG(0xF7); LCD_WR_DATA(0x20); LCD_WR_REG(0xEA); LCD_WR_DATA(0x00); LCD_WR_DATA(0x00); LCD_WR_REG(0xC0);//Power control LCD_WR_DATA(0x1B);//VRH[5:0] LCD_WR_REG(0xC1);//Power control LCD_WR_DATA(0x12);//SAP[2:0];BT[3:0] 0x01 LCD_WR_REG(0xC5);//VCM control LCD_WR_DATA(0x08);//30 LCD_WR_DATA(0x26);//30 LCD_WR_REG(0xC7);//VCM control2 LCD_WR_DATA(0XB7); LCD_WR_REG(0x36);// Memory Access Control LCD_WR_DATA(0x08); LCD_WR_REG(0x3A); LCD_WR_DATA(0x55); LCD_WR_REG(0xB1); LCD_WR_DATA(0x00); LCD_WR_DATA(0x1A); LCD_WR_REG(0xB6);// Display Function Control LCD_WR_DATA(0x0A); LCD_WR_DATA(0xA2); LCD_WR_REG(0xF2);// 3Gamma Function Disable LCD_WR_DATA(0x00); LCD_WR_REG(0x26);//Gamma curve selected LCD_WR_DATA(0x01); LCD_WR_REG(0xE0);//Set Gamma LCD_WR_DATA(0x0F); LCD_WR_DATA(0x1D); LCD_WR_DATA(0x1A); LCD_WR_DATA(0x0A); LCD_WR_DATA(0x0D); LCD_WR_DATA(0x07); LCD_WR_DATA(0x49); LCD_WR_DATA(0X66); LCD_WR_DATA(0x3B); LCD_WR_DATA(0x07); LCD_WR_DATA(0x11); LCD_WR_DATA(0x01); LCD_WR_DATA(0x09); LCD_WR_DATA(0x05); LCD_WR_DATA(0x04); LCD_WR_REG(0XE1);//Set Gamma LCD_WR_DATA(0x00); LCD_WR_DATA(0x18); LCD_WR_DATA(0x1D); LCD_WR_DATA(0x02); LCD_WR_DATA(0x0F); LCD_WR_DATA(0x04); LCD_WR_DATA(0x36); LCD_WR_DATA(0x13); LCD_WR_DATA(0x4C); LCD_WR_DATA(0x07); LCD_WR_DATA(0x13); LCD_WR_DATA(0x0F); LCD_WR_DATA(0x2E); LCD_WR_DATA(0x2F); LCD_WR_DATA(0x05); LCD_WR_REG(0x2B); LCD_WR_DATA(0x00); LCD_WR_DATA(0x00); LCD_WR_DATA(0x01); LCD_WR_DATA(0x3f); LCD_WR_REG(0x2A); LCD_WR_DATA(0x00); LCD_WR_DATA(0x00); LCD_WR_DATA(0x00); LCD_WR_DATA(0xef); LCD_WR_REG(0x11);//Exit Sleep delay_ms(120); #endif LCD_WR_REG(0x29);//display on LCD_direction(USE_HORIZONTAL);//设置LCD显示方向 LCD_LED = 1;//点亮背光 //LCD_Clear(WHITE);//清全屏白色 }
05-11
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