为了对得起AT32F403A那丰富的存储资源,这次为它配上一个2.2'彩色TFT屏,该显示屏采用SPI接口,故将I2C接口和SPI接口联合起来驱动它。 图1 接口资源 相关引脚输出高低电平的引脚定义为: - #define LCD_CS_High() GPIO_SetBits(GPIOB, GPIO_Pins_13)
- #define LCD_CS_Low() GPIO_ResetBits(GPIOB, GPIO_Pins_13) //CS
- #define LCD_REST_High() GPIO_SetBits(GPIOB, GPIO_Pins_11)
- #define LCD_REST_Low() GPIO_ResetBits(GPIOB, GPIO_Pins_11) //RES
- #define LCD_DC_High() GPIO_SetBits(GPIOB, GPIO_Pins_12)
- #define LCD_DC_Low() GPIO_ResetBits(GPIOB, GPIO_Pins_12) //DC
- #define LCD_SDI_High() GPIO_SetBits(GPIOB, GPIO_Pins_9)
- #define LCD_SDI_Low() GPIO_ResetBits(GPIOB, GPIO_Pins_9)//SDI
- #define LCD_SCK_High() GPIO_SetBits(GPIOB, GPIO_Pins_8)
- #define LCD_SCK_Low() GPIO_ResetBits(GPIOB, GPIO_Pins_8)//SCK
- #define LCD_LED_High() GPIO_SetBits(GPIOB, GPIO_Pins_14)
- #define LCD_LED_Low() GPIO_ResetBits(GPIOB, GPIO_Pins_14) //BLK
复制代码 由于与前面介绍的彩色OLED屏所用的引脚位置一致,一个奇异的现象出现了,等待程序下载的显示屏竟显示内容,见图2~图4所示。 OLED屏的程序竟能驱动TFT屏,而且图像完整,只不过显示的内容是镜像的,且颜色互补。 是不是很神奇!
图5 原OLED屏显示效果 在更新程序后,使用红色进行清屏后的效果如图6所示。 图6 红色清屏效果 该2.2寸TFT彩屏的初始化函数为: - void tft_Init(void)
- {
- LCD_REST_Low(); //Lcd_Reset()
- Delay_ms(20); //delay_ms(20);
- LCD_REST_High();
- Delay_ms(20);
- LCD_CS_Low();
- LCD_WR_REG(0xCB); //Lcd_WriteIndex(0xCB);
- LCD_WR_DATA8(0x39);//Lcd_WriteData(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);
- 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
- Delay_ms(120);
- LCD_WR_REG(0x29); //Display on
- LCD_WR_REG(0x2c);
- }
复制代码
它的色彩清屏函数为: - void LCD_Clear(unsigned int Color)
- {
- char VH,VL; // LCD_W= 240 LCD_H =320
- unsigned int 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);
- }
- }
复制代码 在制备了图标文件后,所制作的界面效果如图7所示。 图7 图标化操作界面 在利用板上按键的情况下,可控制功能的选择处理。按键的原理图见图8所示, 读取引脚的语句为: GPIO_ReadInputDataBit(GPIOA, GPIO_Pins_0); GPIO_ReadInputDataBit(GPIOC,GPIO_Pins_13); 图8 按键原理图
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