[问答]

MCU驱动TFT彩屏刷屏数据40ms左右传完了但屏幕实际刷新时间用了300ms以上

问答对人有帮助，内容完整，我也想知道答案 0 MCU使用SPI驱动TFT彩屏刷屏数据40ms左右传完了但屏幕实际刷新时间用了300ms以上 40ms是在刷屏程序里拉低引脚再拉高引脚然后用逻辑分析仪测出来的，刷屏时间的300ms是录屏后数帧数数出来的请问下这个是哪里的问题，是TFT的初始化有问题吗以下代码 #include #include "TFT.h" #include "weather.h" *it BLK = P5^3; //背光控制 it RS = P0^5; //数据命令切换线 it RST = P0^6; //复位线 it CS = P0^7; //片选 it SCLK = P1^5; //SPI时钟线 it MOSI = P1^3; //SPI数据线 *it LED = P5^0; unsigned int time_i = 0; void Timer0Init(void); void UartInit(void); bit Lcd_Clean = 0; bit Lcd_color = 1; void main() { Timer0Init(); UartInit(); LED = 1; ET0 = 1; EA = 1; Lcd_Init(); while(1) { if(Lcd_Clean) { Lcd_Clean = 0; if(Lcd_color) { Lcd_clear(0x8080); Lcd_color = 0; } else { Lcd_clear(0xFFFF); Lcd_color = 1; } } } } void TM0_Isr() interrupt 1 { time_i++; if(time_i == 1000) { time_i = 0; Lcd_Clean = 1; } } void Timer0Init(void) //1毫秒@33.1776MHz { AUXR \|= 0x80; //定时器时钟1T模式 TMOD &= 0xF0; //设置定时器模式 TL0 = 0x66; //设置定时初始值 TH0 = 0x7E; //设置定时初始值 TF0 = 0; //清除TF0标志 TR0 = 1; //定时器0开始计时 } void UartInit(void) //115200bps@33.1776MHz { SCON = 0x50; //8位数据,可变波特率 AUXR \|= 0x40; //定时器时钟1T模式 AUXR &= 0xFE; //串口1选择定时器1为波特率发生器 TMOD &= 0x0F; //设置定时器模式 TL1 = 0xB8; //设置定时初始值 TH1 = 0xFF; //设置定时初始值 ET1 = 0; //禁止定时器%d中断 TR1 = 1; //定时器1开始计时 } void Delay500ms() //@12.000MHz { unsigned char i, j, k; _nop_(); _nop_(); i = 23; j = 205; k = 120; do { do { while (--k); } while (--j); } while (--i); } void SPI_Init() //初始化SPI SPI频率为FOSC/2 { SPDAT = 0; SPSTAT = 0xC0; SPCTL = 0xDF; } void Lcd_Write_cmd(unsigned char cmd) //向TFT写入一个命令 { CS = 0; RS = 0; SPDAT = cmd; while(!(SPSTAT & 0x80)); SPSTAT = 0xC0; CS = 1; } void Lcd_Write_data(unsigned char dat) //向TFT写入一个8位数据 { CS = 0; RS = 1; SPDAT = dat; while(!(SPSTAT & 0x80)); SPSTAT = 0xC0; CS = 1; } void Lcd_Write_data_16bit(unsigned int dat) //向TFT写入一个16位数据 { Lcd_Write_data(dat >> 8); Lcd_Write_data(dat); } void Lcd_SetRegion(unsigned char x_start, unsigned char y_start, unsigned char x_end, unsigned char y_end) //选中一个区域 { Lcd_Write_cmd(0x2A); //列地址设置 Lcd_Write_data(0); Lcd_Write_data(x_start+2); Lcd_Write_data(0); Lcd_Write_data(x_end+2); Lcd_Write_cmd(0x2B); //行地址设置 Lcd_Write_data(0); Lcd_Write_data(y_start+3); Lcd_Write_data(0); Lcd_Write_data(y_end+3); Lcd_Write_cmd(0x2C); } void Lcd_clear(unsigned int color) //清屏 { unsigned int i; LED = 0; Lcd_SetRegion(0,0,127,127); for(i=0;i<16384;i++) { Lcd_Write_data_16bit(color); } LED = 1; } void Lcd_Init() //初始化LCD { BLK = 0; RST = 0; Delay500ms(); RST = 1; Delay500ms(); SPI_Init(); Delay500ms(); Lcd_Write_cmd(0x11); //退出休眠 Delay500ms(); Lcd_Write_cmd(0xB1); //设置正常刷新率 Lcd_Write_data(0x01); Lcd_Write_data(0x2C); Lcd_Write_data(0x2D); Lcd_Write_cmd(0xB2); //设置空闲模式刷新率 Lcd_Write_data(0x01); Lcd_Write_data(0x2C); Lcd_Write_data(0x2D); Lcd_Write_cmd(0xB3); //设置部分/全色的刷新率 Lcd_Write_data(0x01); Lcd_Write_data(0x2C); Lcd_Write_data(0x2D); Lcd_Write_data(0x01); Lcd_Write_data(0x2C); Lcd_Write_data(0x2D); Lcd_Write_cmd(0xB4); //显示反转模式控制 Lcd_Write_data(0x07); Lcd_Write_cmd(0xC0); //电源控制1 Lcd_Write_data(0xA2); Lcd_Write_data(0x02); Lcd_Write_data(0x84); Lcd_Write_cmd(0xC1); //电源控制2 Lcd_Write_data(0xC5); Lcd_Write_cmd(0xC2); //电源控制3 Lcd_Write_data(0x0A); Lcd_Write_data(0x00); Lcd_Write_cmd(0xC3); //电源控制4 Lcd_Write_data(0x8A); Lcd_Write_data(0x2A); Lcd_Write_cmd(0xC4); //电源控制5 Lcd_Write_data(0x8A); Lcd_Write_data(0xEE); Lcd_Write_cmd(0xC5); //VCOM控制1 Lcd_Write_data(0x0E); Lcd_Write_cmd(0x36); //内存数据访问控制 Lcd_Write_data(0xC8); //Lcd_Write_cmd(0x21); Lcd_Write_cmd(0xE0); Lcd_Write_data(0x0F); Lcd_Write_data(0x1A); Lcd_Write_data(0x0F); Lcd_Write_data(0x18); Lcd_Write_data(0x2F); Lcd_Write_data(0x28); Lcd_Write_data(0x20); Lcd_Write_data(0x22); Lcd_Write_data(0x1F); Lcd_Write_data(0x1B); Lcd_Write_data(0x23); Lcd_Write_data(0x37); Lcd_Write_data(0x00); Lcd_Write_data(0x07); Lcd_Write_data(0x02); Lcd_Write_data(0x10); Lcd_Write_cmd(0xE1); Lcd_Write_data(0x0F); Lcd_Write_data(0x1B); Lcd_Write_data(0x0F); Lcd_Write_data(0x17); Lcd_Write_data(0x33); Lcd_Write_data(0x2C); Lcd_Write_data(0x29); Lcd_Write_data(0x2E); Lcd_Write_data(0x30); Lcd_Write_data(0x30); Lcd_Write_data(0x39); Lcd_Write_data(0x3F); Lcd_Write_data(0x00); Lcd_Write_data(0x07); Lcd_Write_data(0x03); Lcd_Write_data(0x10); Lcd_Write_cmd(0xF0); //启动测试命令 Lcd_Write_data(0x01); Lcd_Write_cmd(0xF6); //禁用ram省电模式 Lcd_Write_data(0x00); Lcd_Write_cmd(0x3A); //65k mode Lcd_Write_data(0x05); Lcd_Write_cmd(0x29); //开启显示 // Lcd_SetRegion(0,0,127,127); //选中整个屏幕 Lcd_clear(0x0000); //清屏(青色) BLK = 1; } 复制代码* 0 动画.gif (6.2 MB, 下载次数: 0) QQ图片20220207155423.png (6.2 MB, 下载次数: 0) 已退回10积分
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