and quality of wiring, if you go too fast, you// may end up with a black screen some times, or all the time.//tft.setSPISpeed(40000000);Serial.println(F("Initialized"));uint16_ttime =millis(); tft.fillScreen(ST77XX_BLACK); time =millis() - time; Serial.println(time, DEC);de...
// SPI speed defaults to SPI_DEFAULT_FREQ defined in the library, you can override it here // Note that speed allowable depends on chip and quality of wiring, if you go too fast, you // may end up with a black screen some times, or all the time. //tft.setSPISpeed(40000000); Se...
shiftOut(dataPin, clockPin, bitOrder, value) SPI外部IO扩展函数,通常使用带SPI接口的74HC595做8个IO扩展,dataPin为数据口,clockPin为时钟口,bitOrder为数据传输方向(MSBFIRST高位在前,LSBFIRST低位在前),value表示所要传送的数据(0~255),另外还需要一个IO口做74HC595的使能控制。unsigned long puls...
If any of your settings are variables, you may create a SPISettings object to hold the 3 settings. Then you can give the object name to SPI.beginTransaction(). Creating a named SPISettings object may be more efficient when your settings are not constants, especially if the maximum speed is...
最好的结果: 使用 Arduino_GFX 库 @ESP32C3+ST7789 80MHZ SPI 频率, 在 ESP32C3 到 ST7789 之间的 SPI 引脚最短线下: 46FPS。 ST7789V datasheet (max. spi speed: 15.15Mhz) https://www.displayfuture.com/Display/datasheet/controller/ST7789V.pdf ST7789VW datasheet (max. spi speed: 62.5Mhz...
· Serial.begin(speed)串口定义波特率函数,speed表示波特率,如9600,19200等。 · int Serial.available()判断缓冲器状态。 · int Serial.read()读串口并返回收到参数。 · Serial.flush()清空缓冲器。 · Serial.print(data)串口输...
printf("norflash speed test start n"); lTime = micros(); write_arbitrary_data(0x00, buf, test_size); lTime = micros() - lTime; Serial.printf("write %d byte data end, spi frequency: %ld, time: %f sn", test_size, SPI_FREQUENCY, (lTime / 1000000.0)); memset(buf, 0, test_...
1.SPI 显示屏(控制器ST7735S)的介绍; 2. 显示屏的常用 API; 3. 循迹状态的本地 (显示屏)、远程 (WiFi) 实时显示; 4. 扩展测试及日报编写 学习路径 1、学习了解全彩屏的基本概念,了解程序员眼中的全彩屏; 2、了解LED彩屏常用的驱动芯片; 3、实验用的LCD驱动芯片为ST7735S,查找阅读相关的Arduino函数库;...
3.7.1 Serial.begin(speed)3.7.2 Serial.available 3.7.3 Serial.read 3.7.4 Serial.write 3.7.5 Serial.print和Serial.println 3.7.6 Serial.end 3.8 中断函数 3.8.1 中断的概念 3.8.2 中断的分类 3.8.3 中断的使用 3.9 SPI接口 3.9.1 概述 3.9.2 SPI接口的数据传输 3.9.3 ...