Several important steps to light up the display

One 、 Hardware aspect

Screen input

1. The power supply shall conform to the power supply voltage range of the display 
2. Whether the clock frequency generated by the crystal oscillator circuit is correct , Pay attention to the active crystal oscillator circuit , Need to check PCB See if the wiring is correct 
3. Check whether the reset sequence of the screen is consistent with that of the screen specification 
4. Is there any waveform change in the initialization pin of the screen when powered on , such as SDA、SCL、CS perhaps WR Such pins , If not, you need to check whether the software has configured the initialization pin of the screen 

Screen output

1.HSYNC、VSYNC Is there a waveform 
2.RGB Data foot or DATA Does the foot output 

Two 、 Software aspect

1. Configure the backlight control pin of the screen and call , Make sure the screen is on 
2. Configure the reset pin of the screen 、 Initialization pin SDA、SCL、CS perhaps WR Such pins , as well as RGB perhaps DATA Output pin 
3. If the screen needs additional initialization , Just call the initialization code of the screen , This screen supplier provides . If the screen IC Internal has been initialized , Then there is no need for other MCU to write screen initialization sequence , Otherwise, you need to click the screen according to the information provided by the screen supplier .
4. Debug screen initialization , Adjust screen parameters