驱动ILI9341的lcd能写进数据，屏却没反应,求助！！卡了一个星期了-第2页回答

驱动ILI9341的lcd能写进数据，屏却没反应,求助！！卡了一个星期了

2019-07-15 18:41发布

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11条回答

1楼-- · 2019-07-16 08:51

wufa1986 发表于 2018-3-15 17:55
你可以尝试读lcd的ID寄存器，如果能读出，说明连接没问题，找程序原因

我现在屏幕的几根信号线，我都用示波器直接按在屏幕的排线上测了，都输进去了，屏幕换了好几块了。初始化程序也是厂家给的，lcd.c也是直接移植的，逻辑没改，我也对了时序，没有问题，所以现在就很疑惑，真的想不到办法了，读lcd的ID的程序我暂时还没有找到

taoteyi

2楼-- · 2019-07-16 10:26

int LCD_RD_DATA(void)
{
int i,data=0;
LCD_DC=1;
LCD_CS=0;
for (i = 7; i >= 0; i--) {

data+=LCD_SDO<<i;
LCD_SCK=0;
LCD_SCK=1;
}
LCD_CS=1;
return data;
}
void Lcd_Init(void)
{
int ID;
LCD_CS =1;
LCD_REST=1;
     delay_ms(300);
LCD_REST=0;
     delay_ms(500); // delay 20 ms
   LCD_REST=1;
     delay_ms(300); // delay 20 ms
      //读取41
     LCD_WR_REG(0XD3);
     ID = LCD_RD_DATA();                               //dummy read
     ID= LCD_RD_DATA();                      //读到0X00
     ID=LCD_RD_DATA();          //读取93
     ID<<=8;
     ID|=LCD_RD_DATA();

     LCD_CS=0;
LCD_WR_REG(0xCF);
LCD_WR_DATA8(0x00);
LCD_WR_DATA8(0xD9);
LCD_WR_DATA8(0X30);

LCD_WR_REG(0xED);
LCD_WR_DATA8(0x64);
LCD_WR_DATA8(0x03);
LCD_WR_DATA8(0X12);
LCD_WR_DATA8(0X81);

LCD_WR_REG(0xE8);
LCD_WR_DATA8(0x85);
LCD_WR_DATA8(0x10);
LCD_WR_DATA8(0x78);

LCD_WR_REG(0xCB);
LCD_WR_DATA8(0x39);
LCD_WR_DATA8(0x2C);
LCD_WR_DATA8(0x00);
LCD_WR_DATA8(0x34);
LCD_WR_DATA8(0x02);

LCD_WR_REG(0xF7);
LCD_WR_DATA8(0x20);

LCD_WR_REG(0xEA);
LCD_WR_DATA8(0x00);
LCD_WR_DATA8(0x00);

LCD_WR_REG(0xC0); //Power control
LCD_WR_DATA8(0x21); //VRH[5:0]

LCD_WR_REG(0xC1); //Power control
LCD_WR_DATA8(0x12); //SAP[2:0];BT[3:0]

LCD_WR_REG(0xC5); //VCM control
LCD_WR_DATA8(0x32);
LCD_WR_DATA8(0x3C);

LCD_WR_REG(0xC7); //VCM control2
LCD_WR_DATA8(0XC1);

LCD_WR_REG(0x36); // Memory Access Control
LCD_WR_DATA8(0x08);

LCD_WR_REG(0x3A);
LCD_WR_DATA8(0x55);

LCD_WR_REG(0xB1);
LCD_WR_DATA8(0x00);
LCD_WR_DATA8(0x18);

LCD_WR_REG(0xB6); // Display Function Control
LCD_WR_DATA8(0x0A);
LCD_WR_DATA8(0xA2);

LCD_WR_REG(0xF2); // 3Gamma Function Disable
LCD_WR_DATA8(0x00);

LCD_WR_REG(0x26); //Gamma curve selected
LCD_WR_DATA8(0x01);

LCD_WR_REG(0xE0); //Set Gamma
LCD_WR_DATA8(0x0F);
LCD_WR_DATA8(0x20);
LCD_WR_DATA8(0x1E);
LCD_WR_DATA8(0x09);
LCD_WR_DATA8(0x12);
LCD_WR_DATA8(0x0B);
LCD_WR_DATA8(0x50);
LCD_WR_DATA8(0XBA);
LCD_WR_DATA8(0x44);
LCD_WR_DATA8(0x09);
LCD_WR_DATA8(0x14);
LCD_WR_DATA8(0x05);
LCD_WR_DATA8(0x23);
LCD_WR_DATA8(0x21);
LCD_WR_DATA8(0x00);

LCD_WR_REG(0XE1); //Set Gamma
LCD_WR_DATA8(0x00);
LCD_WR_DATA8(0x19);
LCD_WR_DATA8(0x19);
LCD_WR_DATA8(0x00);
LCD_WR_DATA8(0x12);
LCD_WR_DATA8(0x07);
LCD_WR_DATA8(0x2D);
LCD_WR_DATA8(0x28);
LCD_WR_DATA8(0x3F);
LCD_WR_DATA8(0x02);
LCD_WR_DATA8(0x0A);
LCD_WR_DATA8(0x08);
LCD_WR_DATA8(0x25);
LCD_WR_DATA8(0x2D);
LCD_WR_DATA8(0x0F);

LCD_WR_REG(0x11); //Exit Sleep
delay_ms(120);
LCD_WR_REG(0x29); //Display on

LCD_Clear(WHITE);
}

没有找到读ID的程序，这是我自己写的读取ID的程序，现在读到的都是0。