LCD屏具有较强的表现力，既适合文字信息的显示，也适合图像的表现。
这里使用的是一款0.96寸的LCD显示屏，其显示分辨率为80*160像素点，它以SPI的方式来工作。
其引脚与开发板的连接关系为：
CLK---PB4
DIN---PB5
RES--PB6
DC ---PB7
CS ---PC3
BLK---3.3V
所使用的接口如图1所示：
图1 引脚占用
图2连接形式
#defineOLED_SCLK_Set() gpio_set_level(GPIO_PB4, 1) //CLK
#defineOLED_SCLK_Clr() gpio_set_level(GPIO_PB4, 0)
#defineOLED_SDIN_Set() gpio_set_level(GPIO_PB5, 1) //
DIN#defineOLED_SDIN_Clr() gpio_set_level(GPIO_PB5, 0)
#defineOLED_RST_Set() gpio_set_level(GPIO_PB6, 1) //RES
#defineOLED_RST_Clr() gpio_set_level(GPIO_PB6,0)
#defineOLED_DC_Set() gpio_set_level(GPIO_PB7, 1) //DC
#defineOLED_DC_Clr() gpio_set_level(GPIO_PB7, 0)
#defineOLED_CS_Set() gpio_set_level(GPIO_PC3, 1) //CS
#defineOLED_CS_Clr() gpio_set_level(GPIO_PC3, 0)
以GPIO方式模拟SPI方式方式字节数据的函数为：
voidLCD_Writ_Bus(unsignedchardat){ unsignedchari; OLED_CS_Clr(); for(i=0;i<8;i++) { OLED_SCLK_Clr(); if(dat&0x80) OLED_SDIN_Set(); else OLED_SDIN_Clr(); OLED_SCLK_Set(); dat<<=1; } OLED_CS_Set(); }
复制代码LCD屏的初始化函数为：
voidLcd_Init(void){ OLED_RST_Clr(); delay_ms(200); OLED_RST_Set(); delay_ms(200); LCD_WR_REG(0x11); delay_ms(100); LCD_WR_REG(0x21); LCD_WR_REG(0xB1); LCD_WR_DATA8(0x05); LCD_WR_DATA8(0x3A); LCD_WR_DATA8(0x3A); LCD_WR_REG(0xB2); LCD_WR_DATA8(0x05); LCD_WR_DATA8(0x3A); LCD_WR_DATA8(0x3A); LCD_WR_REG(0xB3); LCD_WR_DATA8(0x05); LCD_WR_DATA8(0x3A); LCD_WR_DATA8(0x3A); LCD_WR_DATA8(0x05); LCD_WR_DATA8(0x3A); LCD_WR_DATA8(0x3A); LCD_WR_REG(0xB4); LCD_WR_DATA8(0x03); LCD_WR_REG(0xC0); LCD_WR_DATA8(0x62); LCD_WR_DATA8(0x02); LCD_WR_DATA8(0x04); LCD_WR_REG(0xC1); LCD_WR_DATA8(0xC0); LCD_WR_REG(0xC2); LCD_WR_DATA8(0x0D); LCD_WR_DATA8(0x00); LCD_WR_REG(0xC3); LCD_WR_DATA8(0x8D); LCD_WR_DATA8(0x6A); LCD_WR_REG(0xC4); LCD_WR_DATA8(0x8D); LCD_WR_DATA8(0xEE); LCD_WR_REG(0xC5); LCD_WR_DATA8(0x0E); LCD_WR_REG(0xE0); LCD_WR_DATA8(0x10); LCD_WR_DATA8(0x0E); LCD_WR_DATA8(0x02); LCD_WR_DATA8(0x03); LCD_WR_DATA8(0x0E); LCD_WR_DATA8(0x07); LCD_WR_DATA8(0x02); LCD_WR_DATA8(0x07); LCD_WR_DATA8(0x0A); LCD_WR_DATA8(0x12); LCD_WR_DATA8(0x27); LCD_WR_DATA8(0x37); LCD_WR_DATA8(0x00); LCD_WR_DATA8(0x0D); LCD_WR_DATA8(0x0E); LCD_WR_DATA8(0x10); LCD_WR_REG(0xE1); LCD_WR_DATA8(0x10); LCD_WR_DATA8(0x0E); LCD_WR_DATA8(0x03); LCD_WR_DATA8(0x03); LCD_WR_DATA8(0x0F); LCD_WR_DATA8(0x06); LCD_WR_DATA8(0x02); LCD_WR_DATA8(0x08); LCD_WR_DATA8(0x0A); LCD_WR_DATA8(0x13); LCD_WR_DATA8(0x26); LCD_WR_DATA8(0x36); LCD_WR_DATA8(0x00); LCD_WR_DATA8(0x0D); LCD_WR_DATA8(0x0E); LCD_WR_DATA8(0x10); LCD_WR_REG(0x3A); LCD_WR_DATA8(0x05); LCD_WR_REG(0x36); LCD_WR_DATA8(0x78); LCD_WR_REG(0x29); OLED_BLK_Set(); }
复制代码实现色彩清除屏幕的函数为：
voidLCD_Clear(unsignedint Color){ unsignedinti,j; LCD_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_DATA(Color); } } }
复制代码实现图像显示的函数为：
voidLCD_ShowPicturea(unsignedintx1,unsignedint y1,unsignedint x2,unsignedint y2){ unsignedint i; LCD_Address_Set(x1,y1,x2,y2); for(i=0;i<12800;i++) { LCD_WR_DATA8(gImage_FJ[i*2]); LCD_WR_DATA8(gImage_FJ[i*2+1]); } }
复制代码此外，还配置了字符、数值及汉字显示函数，其验证显示效果的主程序为：
int main (void){ sys_init(LDO_1P4_LDO_1P8, VBAT_MAX_VALUE_GREATER_THAN_3V6); user_read_flash_value_calib(); CCLK_24M_HCLK_24M_PCLK_24M; user_init(); delay_ms(1000); Lcd_Init(); BACK_COLOR=YELLOW; POINT_COLOR=RED; LCD_Clear(RED); POINT_COLOR=RED; LCD_ShowPicturea(0,0,159,79); LCD_ShowChinese(0,0,8,16,RED); LCD_ShowChar(0,20,'V',0,RED); LCD_ShowNum(20,20,123,3,RED); while (1) ; return 0; }
复制代码经程序的编译和下载，其测试效果见图3所示，其显示效果该是相对不错的！
图3 显示效果
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