lcd display stm32 made in china

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Today I am going to interface LCD to STM32 using an I2C device (PCF8574). PCF8574can be used as a port extender, to which LCD will be connected. If you haven’t read my previous post about I2C go check that out HERE.

Well you generally don’t but as I mentioned in my previous article that we can connect up to 128 devices on the same I2C line and let’s say we want to connect two different LCDs on the same I2C line, than we can’t use two PCF8574 with same addresses and we need to modify one of them.

As shown in the figure above, first pin of the device is Vsswhich is pin 1 of LCD. So all you have to do is connect first pins of the LCD to Vssabove and rest will connect accordingly. Starting with Vss as first pin, connection is as follows:-

As according to the datasheet of the LCD 16×2, in order to initialize the LCD, we have to use some sequence of commands. The code is commented properly, so that you can understand it better

As a 2inch IPS display module with a resolution of 240 * 320, it uses an SPI interface for communication. The LCD has an internal controller with basic functions, which can be used to draw points, lines, circles, and rectangles, and display English, Chinese as well as pictures.

The 2inch LCD uses the PH2.0 8PIN interface, which can be connected to the Raspberry Pi according to the above table: (Please connect according to the pin definition table. The color of the wiring in the picture is for reference only, and the actual color shall prevail.)

The example we provide is based on STM32F103RBT6, and the connection method provided is also the corresponding pin of STM32F103RBT6. If you need to transplant the program, please connect according to the actual pin.

The LCD supports 12-bit, 16-bit, and 18-bit input color formats per pixel, namely RGB444, RGB565, and RGB666 three color formats, this demo uses RGB565 color format, which is also a commonly used RGB format.

For most LCD controllers, the communication mode of the controller can be configured, usually with an 8080 parallel interface, three-wire SPI, four-wire SPI, and other communication methods. This LCD uses a four-wire SPI communication interface, which can greatly save the GPIO port, and the communication speed will be faster.

Note: Different from the traditional SPI protocol, the data line from the slave to the master is hidden since the device only has display requirement.

Framebuffer uses a video output device to drive a video display device from a memory buffer containing complete frame data. Simply put, a memory area is used to store the display content, and the display content can be changed by changing the data in the memory.

If you need to draw pictures, or display Chinese and English characters, we provide some basic functions here about some graphics processing in the directory RaspberryPi\c\lib\GUI\GUI_Paint.c(.h).

Set points of the display position and color in the buffer: here is the core GUI function, processing points display position and color in the buffer.

The fill color of a certain window in the image buffer: the image buffer part of the window filled with a certain color, usually used to fresh the screen into blank, often used for time display, fresh the last second of the screen.

Display time: in the image buffer,use (Xstart Ystart) as the left vertex, display time,you can choose Ascii visual character font, font foreground color, font background color.;

2. The module_init() function is automatically called in the INIT () initializer on the LCD, but the module_exit() function needs to be called by itself

Python has an image library PIL official library link, it do not need to write code from the logical layer like C, can directly call to the image library for image processing. The following will take 1.54inch LCD as an example, we provide a brief description for the demo.

Note: Each character library contains different characters; If some characters cannot be displayed, it is recommended that you can refer to the encoding set ro used.

I recently heard of GD32F103 processors made by Giga Devices an Chinese company which make STM32 ‘compatible’ microcontrollers targeting their popular STM32F103 series.

Looking at the publishing specs GD32 also looks better than STM32, the only problem is that it’s not possible to know for sure if what the Chinese manufacturers write in their datasheet is tested and is real.

For instance they claim 108 Mhz operation for the chips, even some web blogs says they ran GD32F103 up to 120Mhz “without problem”, but these are amateur claims, probably made these tests at room temperature :), let me tell you secret original STM32 will also run at this frequency, but ST do not claim this in the datasheet as they have to guarantee the work in the whole operating temperature range and whole power supply range in the datasheets.

So if Giga Devices offer something better in specs in quite questionable, sure for amateur not crytical use apps like blinking LEDs in house, this will be perfect chip, and it’s main advantage is the lower cost compared to STM32.

I was very doubtful something like this is true for number of reasons. To produce STM32 chip itself as hardware cost not so much, the reason ST sell it at this price is that they have spent lot of resource to design and market these chips, also they pay small royalty fee to ARM for every chip they sell. So obviously they can achieve the same sale prices as Giga Devices if they were in same situation – zero development cost and just copy and paste someone else’s product. It’s very doubtful if Giga Devices pay royalties to ARM also, but this is just my speculation ;).

Those GD32xxx devices are effectively a kind of clones of our STM32, but it"s a pure piracy: no agreements of any kind between ST and Giga Device, no license... nothing.

For everyone is clear that purchasing of STM32 chip through normal USA or EU distribution channels is expensive if you want to make mass product. The EU distributors are too fat and lazy to offer you anything which will allow you to build competitive product if you have to compete with far east manufacturers.

Now when there are clones of STM32 this becomes a problem as we will never know when we buy STM32 chips from China if these are original ST parts or Giga Devices clones which are re-marked as STM32 processors.

In my opinion on long terms this will have enormous impact on ST brand as many people may buy counterfeit devices believing they buy original ST chips, but these chips will be just clones marked as STM32 and blame ST for all problems they encounter with these chips. This way the major ST advantage they had vs NXP LPC series will vanish as they were know to be sourcable at lower cost than NXP in China.

I think the lawers would not help in this case. They may shut down Giga Devices legally, but illegally the cloned STM32 design can be produced at many places secretly and sold as STM32 original parts even after the GigaDevices closure!