stm32 spi tft display free sample

Other than SPI pins, we need to select three more pins as output. I have selectedPB6 for CS, PC7 for RESET, and PA9 for DC. You are free to choose any other pins also, whatever suits the requirement

The LCD I am using is a 2.8″ TFT LCD with SPI communication. I also have another 16-bit Parallel TFT LCD but it will be another story for another time. For this post, let’s focus on how to display what you want on the 2.8″ LCD. You can find all details about this LCD from this page:http://www.lcdwiki.com/2.8inch_SPI_Module_ILI9341_SKU:MSP2807

First thing first, this LCD use SPI as the main communication protocol with your MCU. For STM32 users, HAL Library has already implemented this protocol which makes this project easier for us. But, a little knowledge about this protocol does not hurt anyone. SPI is short for Serial Peripheral Interface which, aside from two data lines, also has a clock line and select lines to choose between devices you want to communicate with.

This LCD uses ILI9341 as a single-chip SOC driver for a display with a resolution of 240×320. More details can be found in the official document of ILI9341. But the most important thing is that we have to establish astart sequencein order for this LCD to work. The “start sequence” includes many other sequences which are also defined in the datasheet. Each sequence starts when you send a command to ILI9341 and then some parameters to follow up. This sequence is applied for all communication between MCU and ILI9341.

For this project, I recommend using theSystem Workbench for STM32for coding and building the code. After installing and open the program, go to the source code you have just downloaded and double click the.cprojectfile. It will automatically be open in your IDE. Then build the program by right click on the folder you just open (TFTLCD) and chooseBuild Project. Wait for it to finish and upload it to the board by right clicking the folder, choose Run As and then clickAc6 STM32C/C++ Application. And that’s it for running the example.

The most important library for this project is obviously the ILI9341_Driver. This driver is built from the provided source code in the lcdwiki.com page. I only choose the part that we need to use the most in many applications like writing string, displaying image and drawing symbols. Another library from the wiki page is the TOUCH library. Most of the libraries I got from the Internet were not working properly due to some adjustments to the original one.

To draw symbols or even display images, we need a “byte array” of that image or symbol. As an illustration, to display an image from a game called Transistor, I have a “byte array” of that image stored in a file named transistor.h. You can find this file in the link below. Then, I draw each pixel from the image to the LCD by adding the code in the Display_Picture() function in the Display folder.void Display_Picture()

The above example is just only for displaying black and white image. In order to show a color image, we need to a little bit different. First, go tothis websiteto generate the array of the colour image. Remember to change your size to 320×240 and choose the 65K color option. Because it now takes up two bytes for one pixel, we need to send two bytes at once. You can check the Display_Color_Picture() function in the Display folder.void Display_Color_Picture()

With the integration of Bridgetek’s next generation EVE3 BT815/BT816 Embedded Video Engine IC, Matrix Orbital EVE3 SPI TFT"s deliver clean, crisp, full color TFT screens for interactive menus, graphing, graphics and even video.

Point of Sales Machines, Multi-function Printers, Instrumentation, Home Security Systems, Graphic touch pad – remote, dial pad, Tele/Video Conference Systems, Phones and Switchboards, Medical Appliances, Breathalyzers, Gas chromatographs, Power meter, Home appliance devices, Set-top box, Thermostats, Sprinkler system displays, GPS / Satnav, Vending Machine Control Panels, Elevator Controls, and many more....

This new library is a standalone library that contains the TFT driver as well as the graphics functions and fonts that were in the GFX library. This library has significant performance improvements when used with an UNO (or ATmega328 based Arduino) and MEGA.

Examples are included with the library, including graphics test programs. The example sketch TFT_Rainbow_one shows different ways of using the font support functions. This library now supports the "print" library so the formatting features of the "print" library can be used, for example to print to the TFT in Hexadecimal, for example:

To use the F_AS_T performance option the ILI9341 based display must be connected to an MEGA as follows:MEGA +5V to display pin 1 (VCC) and pin 8 (LED) UNO 0V (GND) to display pin 2 (GND)

TFT_ILI9341 library updated on 1st July 2015 to version 12, this latest version is attached here to step 8:Minor bug when rendering letter "T" in font 4 without background fixed

I wanted to try these ST7735 inexpensive displays that can be found all over the internet, so I ordered a couple for a few euros each. My quick research showed that a number of libraries support them and it turns out that you can display anything you want. Of course, we are not talking about playing modern games on it or watching 4k videos. These are just simple displays that can be really helpful to any project.

And here is how the TFT looks. As you see it also has a port for an SD card if you want to use e.g. for reading images from it. In my case, I didn’t connect it.

Once you have the connections ready next step is to install the TFT library in your Arduino IDE. Go to Tools – > Manage Libraries and then search for TFT_eSPI and click install. Alternatively, crab the lib from here.

After this, you can pick any of the examples from the library to upload to your ESP32 microcontroller. Some of them are really nice. For testing, I connected a DHT11 temperature/humidity sensor and I displayed the readings in the ST7735. Sweet!

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STM32F429 has also LTDC driver for LCD like that, but this driver we will use later. For now we will use SPI for driving in serial mode and some other pins for controlling.

Remember: This library can also be used, if you are not using STM32F429 Discovery. It can be used in previous STM32F4 Discovery board. All pins can be changed in defines.h file which is included in project.

In this tutorial, I will show you How to use SPI in STM32F103C8T6 MCU based STM32 Blue Pill Board. For SPI Communication, we need one master device and one or more slave devices. Hence, for demonstrating SPI in STM32F103C8T6, I will be configuring STM32 as SPI Master and Arduino UNO as SPI Slave.

SPI, which is short for Serial Peripheral Interface, is one of the frequently used communication protocols for transfer of data between a Microcontroller and a wide range of peripheral devices like Flash Memories, EEPROMs, SD Cards, Sensors, LCDs, etc.

A common way to implement SPI Communication is using four wires, although there are ways you can use lesser number of wires. In this tutorial, I will be using the four wire SPI Communication and the four wires are called as:

The internal hardware of SPI Communication is very simple. It consists of a Shift Register and a Data Latch. An important point to remember is that the Master device is responsible for generating the Clock Signal on the SCLK Line.

Coming to SPI in STM32F103C8T6 MCU, there are two SPI interfaces in this MCU and both can work in full duplex or simplex mode at speeds up to 18 Mbits/s. if you remember the pin configuration of the STM32 Blue Pill Board, you can see both the SPI Interfaces marked in purple colour.

As mentioned earlier, I am going to use Arduino UNO as the SPI Slave device. You can use any other SPI Devices like any Sensors or Memory ICs but I chose to use an Arduino as you can easily decode the SPI data and further do something extra like light up an LED or display the information on an LCD, which you cannot do with an EEPROM IC.

Speaking of SPI in Arduino, the Digital IO pins 10 through 11 are wired to the SPI Interface. The following table lists out the SPI pins in Arduino UNO.

For demonstration of SPI in STM32F103C8T6, the STM32 Blue Pill Board is configured as SPI Master and Arduino UNO is configured as SPI Slave. Both the boards are connected with external Push Buttons and I will also use the on-board LEDs on each board.

When the Push Button connected to STM32 is pressed, the LED on Arduino will be turned ON. Similarly, when the Push Button connected to Arduino UNO is pressed, the LED on STM32 Blue Pill Board will be turned ON.

First, make a note of the SPI Pins in both STM32 Board and Arduino UNO. Then connect the corresponding pins of each board i.e. MOSI pin on STM32 (PA7) to MOSI Pin on Arduino (Digital IO 11), MISO pin on STM32 (PA6) to MISO Pin on Arduino (Digital IO 12), SCLK pin on STM32 (PA5) to SCK Pin on Arduino (Digital IO 13) and SS pin on STM32 (PA4) to SS Pin on Arduino (Digital IO 10).

Now, connect one end of a push button to PA0 pin of STM32. Also, pull this pin to GND using a 10KΩ resistor. Connect the other end of the push button to 3.3V. Repeat the same thing for Arduino i.e. connect one end of a push button to Digital IO pin 6 and pull this pin to GND using a 10KΩ resistor. Connect the other end of the push button to 5V.

First, let me start programming the STM32. Define the pins for LED, Button and Slave Select and set the LED Pin and Slave Select Pins as OUTPUT and Button Pin as INPUT.

Begin the SPI Communication and reduce the clock for SPI using SPI_CLOCK_DIV16. This will divide the main clock i.e. 72 MHz by 16 to get the SPI clock as 4.5 MHz. Initially, make the SS pin as HIGH i.e. the slave is not yet connected.

In the loop, read the status of the Button and transmit it through SPI. While transmitting, the slave also sends the data and capture the slave data in to a variable.

By default, the Arduino in SPI acts as Master. But we want our Arduino to act as slave for this tutorial. In order to make Arduino’s SPI as Slave, you have to modify the SPCR register.

The SPI Interrupt is enabled so that, when ever the SPI receives data, an interrupt is generated. In the Interrupt Service Routine of SPI, the received data is captured in a variable.

In the loop, the status of the button is read and this is transmitted using SPI. Also, the received data, which we captured in the ISR is analysed and the LED is turned ON or OFF accordingly.

IMPORTANT NOTE: First connect the STM32 to your computer, upload the program (using either USB to UART or direct USB Bootloader) and disconnect it from the computer. Now, connect the Arduino UNO to the computer, modify the settings in Arduino IDE, upload the program to Arduino and disconnect it.

A simple project for demonstrating SPI in STM32F103C8T6 MCU based STM32 Blue Pill Board is implemented here. The STM32 is acting as master in the SPI Communication while Arduino UNO is used as a slave device.

When a button is pressed in the master i.e. STM32, an LED will light up on Arduino board. Similarly, when a button is pressed in Arduino, an LED in STM32 will light up.

The Numworks calculator I am referencing uses a STM32 f7 and it will work at 2.8v, but not my teensy working at 600mhz. And it doesn"t need 5v because it doesn"t have a usb host port. Power supplying a battery powered project the a pain in the ass.