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CH340 contact signal (RTS DTR) development board can drive OLED

Overview

When it comes to CH340, everyone must be familiar with it, especially those who play microcontrollers. It is a USB to serial port chip launched by Qinheng Microelectronics.
Today we are not going to play with serial communication, but use ch340 to do something.
In addition to RXD TXD for serial communication, CH340 also has two special pins, RTS and DTR.
Does it look familiar? Yes, the cold-start downloader of the 51 microcontroller and the automatic download of the esp8266 both use these two pins. In addition to the automatic download software, some serial port software also has the function of controlling these two pins. key, such as XCOM
So can we control these two pins with code? Yes, I found this API on Microsoft's website:
It has two parameters,
Parameter 1 is the file pointer of the serial port.
Parameter 2 is the function to be executed. Parameter 2 supports the following values
CLRDTR clears DTR. Since these two pins are high level by default, clearing them means clearing them to high level.
CLRRTS Clear RTS
SETDTR sets DTR low
STERTS sets RTS low.
Let’s take a look at the specific effects

Click here to watch the demo video

The code can be found in the attachment

Design Files

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Update:2024-11-24 21:08:40

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