TFT2.4寸彩屏是一款基于SPI接口的显示屏,使用AutoChips 7801开发板完全可以驱动TFT2.4寸彩屏。 该TFT屏与MCU的连接关系为: LCD_ SCK ——PB11 LCD_ SDI ——PB12 LCD_LED ——3.3V LCD_CS ——GND LCD_DC ——PB5 LCD_ REST ——PB4 其余的两个引脚则接3.3V工作电源
定义GPIO口输出高低电平的语句为: #define LCD_CS_High() GPIO_SetPinLevel(GPIOA, GPIO_PIN8,GPIO_LEVEL_HIGH // PA8 #define LCD_CS_Low() GPIO_SetPinLevel(GPIOA, GPIO_PIN8,GPIO_LEVEL_LOW);
#define LCD_SCK_High()GPIO_SetPinLevel(GPIOB, GPIO_PIN11, GPIO_LEVEL_HIGH); // PB11 #define LCD_SCK_Low() GPIO_SetPinLevel(GPIOB, GPIO_PIN11,GPIO_LEVEL_LOW);
#define LCD_SDI_High() GPIO_SetPinLevel(GPIOB, GPIO_PIN12,GPIO_LEVEL_HIGH); // PB12 #define LCD_SDI_Low() GPIO_SetPinLevel(GPIOB, GPIO_PIN12,GPIO_LEVEL_LOW);
#define LCD_DC_High() GPIO_SetPinLevel(GPIOB, GPIO_PIN5,GPIO_LEVEL_HIGH); // PB5 #define LCD_DC_Low() GPIO_SetPinLevel(GPIOB, GPIO_PIN5,GPIO_LEVEL_LOW);
#define LCD_REST_High() GPIO_SetPinLevel(GPIOB, GPIO_PIN4,GPIO_LEVEL_HIGH); // PB4 #define LCD_REST_Low() GPIO_SetPinLevel(GPIOB, GPIO_PIN4,GPIO_LEVEL_LOW);
TFT屏的初始化函数为: - void Lcd_Init(void)
- {
- LCD_REST_Low();
- mdelay(20);
- LCD_REST_High();
- mdelay(20);
- LCD_CS_Low();
- 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(0xCF);
- LCD_WR_DATA8(0x00);
- LCD_WR_DATA8(0XC1);
- LCD_WR_DATA8(0X30);
- LCD_WR_REG(0xE8);
- LCD_WR_DATA8(0x85);
- LCD_WR_DATA8(0x00);
- LCD_WR_DATA8(0x78);
- LCD_WR_REG(0xEA);
- LCD_WR_DATA8(0x00);
- LCD_WR_DATA8(0x00);
- LCD_WR_REG(0xED);
- LCD_WR_DATA8(0x64);
- LCD_WR_DATA8(0x03);
- LCD_WR_DATA8(0X12);
- LCD_WR_DATA8(0X81);
- LCD_WR_REG(0xF7);
- LCD_WR_DATA8(0x20);
- LCD_WR_REG(0xC0); //Power control
- LCD_WR_DATA8(0x23); //VRH[5:0]
- LCD_WR_REG(0xC1); //Power control
- LCD_WR_DATA8(0x10); //SAP[2:0];BT[3:0]
- LCD_WR_REG(0xC5); //VCM control
- LCD_WR_DATA8(0x3e);
- LCD_WR_DATA8(0x28);
- LCD_WR_REG(0xC7); // VCM control2
- LCD_WR_DATA8(0x86); // --
- LCD_WR_REG(0x36); // Memory Access Control
- LCD_WR_DATA8(0x48); // C8
- 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(0x08);
- LCD_WR_DATA8(0x82);
- LCD_WR_DATA8(0x27);
- 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(0x31);
- LCD_WR_DATA8(0x2B);
- LCD_WR_DATA8(0x0C);
- LCD_WR_DATA8(0x0E);
- LCD_WR_DATA8(0x08);
- LCD_WR_DATA8(0x4E);
- LCD_WR_DATA8(0xF1);
- LCD_WR_DATA8(0x37);
- LCD_WR_DATA8(0x07);
- LCD_WR_DATA8(0x10);
- LCD_WR_DATA8(0x03);
- LCD_WR_DATA8(0x0E);
- LCD_WR_DATA8(0x09);
- LCD_WR_DATA8(0x00);
- LCD_WR_REG(0XE1); //Set Gamma
- LCD_WR_DATA8(0x00);
- LCD_WR_DATA8(0x0E);
- LCD_WR_DATA8(0x14);
- LCD_WR_DATA8(0x03);
- LCD_WR_DATA8(0x11);
- LCD_WR_DATA8(0x07);
- LCD_WR_DATA8(0x31);
- LCD_WR_DATA8(0xC1);
- LCD_WR_DATA8(0x48);
- LCD_WR_DATA8(0x08);
- LCD_WR_DATA8(0x0F);
- LCD_WR_DATA8(0x0C);
- LCD_WR_DATA8(0x31);
- LCD_WR_DATA8(0x36);
- LCD_WR_DATA8(0x0F);
- LCD_WR_REG(0x11); //Exit Sleep
- mdelay(120);
- LCD_WR_REG(0x29); //Display on
- LCD_WR_REG(0x2c);
- }
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清屏处理函数为:- void LCD_Clear(uint16_t Color)
- {
- char VH,VL;
- uint16_t i,j;
- VH=Color>>8;
- VL=Color;
- Address_set(0,0,LCD_W-1,LCD_H-1);
- for(i=0;i<LCD_W;i++)
- {
- for (j=0;j<LCD_H;j++)
- {
- LCD_WR_DATA8(VH);
- LCD_WR_DATA8(VL);
- }
- }
- }
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实现图1和图2显示效果的主程序为:- int main(void)
- {
- InitDelay();
- mdelay(200);
- GPIO_Configuration();
- Lcd_Init();
- LCD_Clear(RED);
- BACK_COLOR=RED;
- POINT_COLOR=WHITE;
- LCD_ShowString(20,80,160,16,16,"AC8701 TEST");
- LCD_ShowString(20,100,200,16,16,"SPI_TFT 2.4' 240*320");
- LCD_ShowString(20,120,160,16,16,"jinglxixi ");
- mdelay(1000);
- LCD_Clear(WHITE);
- show_imageh(10,300,1);
- while(1);
- }
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图1 文字显示效果
图2的显示函数为:- void show_imageh(unsigned int x,unsigned int y,unsigned int n) //200*200
- {
- unsigned int i,j,k;
- unsigned int da;
- k=0;
- for(i=0;i<200;i++)
- {
- for(j=0;j<200;j++)
- {
- if(n==1) da=gImage_zs[k*2];
- da<<=8;
- if(n==1) da|=gImage_zs[k*2+1];
- POINT_COLOR=da;
- LCD_DrawPoint(x+i,y-j);
- k++;
- }
- }
- }
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图2 图片显示效果
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