STM32 LCD Tutorial | 16x2 LCD in 4-Bit Mode (No I2C, Full HAL Code Walkthrough) - video Dailymotion

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Learn how to interface a 16x2 LCD with STM32 in 4-bit parallel mode — no I2C needed!  In this step-by-step tutorial, we’ll configure STM32CubeMX, connect the LCD pins,  and write HAL driver functions to display text, ASCII characters, and scrolling messages.    📂 Download Project Files & Code:  👉 [https://controllerstech.com/interface-lcd-16x2-with-stm32-without-i2c/]   📺 Related Videos:  - I2C LCD with STM32: [https://youtu.be/rfRJGfK2t-A]  - How to write the LCD library: [https://youtu.be/WAGLQOIHEio]  - STM32 Microsecond Delay Tutorial: [https://youtu.be/SqC0IhLKJ9o]  - STM32 Custom Characters on LCD: [https://youtu.be/diwjZPmFUKo]   If you found this helpful, don’t forget to LIKE 👍, SUBSCRIBE 🔔, and SHARE!    STM32 Playlist :::: https://www.youtube.com/playlist?list=PLfIJKC1ud8gga7xeUUJ-bRUbeChfTOOBd   #STM32 #LCD #MicrocontrollerProjects #EmbeddedSystems #Electronics #HAL #CubeMX #IoT #ArduinoAlternative #Microcontrollers #LCDDisplay   ________________________________________________________________________________________    Facebook Page : https://www.facebook.com/controllerstech   Telegram Group : https://t.me/controllerstechdiscuss   Instagram : https://www.instagram.com/controllerstech/   For more info, visit https://controllerstech.com

Transcript

00:00Hello everyone. Welcome to Controllers Tech. Many of you requested this, so here we are,

00:16interfacing LCD 16x2 with SDM32, but without i2c this time. In parallel connection, LCD can work

00:25in two different modes. 8-bit, and 4-bit mode. In 8-bit mode, we need to use all 8 data pins,

00:35and in 4-bit mode we can use only 4 data pins. We will use 4-bit mode in this tutorial. Let's

00:43start with the cube IDE. Create a new SDM32 project.

00:58I am using F103C8 controller. Give some name to the project, and click Finish.

01:28We have the cube MX here, for the setup. I am enabling the external crystal for the clock.

01:35Enable the serial wire debug. We also need the delay in microseconds, so I am using timer 1 for the same.

01:45If you don't know about microsecond delay, check out the video on the top right corner.

01:50Let's set up the clock first. I want to run the controller at maximum possible frequency, 72 MHz.

02:06The APB2 clock is also at 72 MHz, and timer 1 is connected to APB2. A prescaler of 72 will divide

02:16the clock to 1 MHz. Input the maximum possible value for the ARR, that is 0XFFF, as it is 16-bit register.

02:27As shown in this picture, pins PA1 to PA7 are connected to the LCD. We need to select them as output.

02:36This is it for the setup. Now click save and the project will be generated.

02:49Here is our main .c file.

03:11First of all we need to include the library files.

03:19You can get these files, after you download the project from the link in the description.

03:33There is nothing special in the header file. These are the functions that you can use for the LCD.

03:40We need to modify things in the LCD1602.c file.

03:44My connections is as shown in the picture. From RS to enable pin, and from D4 to D7.

03:54You can use any pin and any port for the connection. Just make sure you define them properly here.

04:10You can use the timer handler.

04:23Define the timer handler, that you are using for the delay.

04:26This function here is an internal function. And it is not defined in the header file.

04:42Send to LCD, is for writing the 4-bit data, or command, to the pins of the LCD.

04:49It takes two parameters. First is the useful data, which is only 4-bit long, and second is the RS.

04:57We update the pins, to the respective bit in the data variable.

05:08RS must be 1 for sending data, and 0 for sending command.

05:13Once the data is written to the pins, we will toggle the enable pin.

05:23This will ensure that the data has been updated successfully.

05:27I am keeping this 20 microseconds delay commented out right now.

05:33We will see if it works without the delay or not.

05:35For higher clocks, this delay must be there.

05:40If the display shows some weird characters, try increasing or reducing this delay.

05:47LCD send command is used, to send the command to the LCD.

05:52As we are only using 4 data pins, our 8-bit command should also be divided into two 4-bit commands.

05:59That's why we need to send the command into two halves, upper nibble, and lower nibble.

06:06Note that RS is 0, to indicate that it's a command.

06:11LCD send data is used to send the data to the LCD.

06:16It uses the same process of sending the upper nibble first, and then lower one.

06:22The RS pin must be high to indicate, that the data is being sent.

06:26This command is used to put the cursor at the entered location.

06:36Row can be 0 or 1, and column can be from 0 to 15.

06:49This function initializes the LCD in the 4-bit mode.

06:52These commands are written as per instructions in the datasheet.

06:58Then you have some display control functions here.

07:02You can modify them if you want some other configuration.

07:06For example if you want the blinking cursor, use C, and V as one in this command.

07:13Let's write the main code now.

07:15First, we need to include the header file.

07:26Make sure you start the timer before initializing the LCD.

07:30Now, I am going to put the cursor at 0, 0, and send some strings to the LCD.

07:41And then, put the cursor at first row, and 0 column.

07:57And then send another string.

07:58I want to wait for 3 seconds, and then clear the display.

08:11Inside the while loop, this function will print the ASCII characters from 1 to 128.

08:17Now, let's flash it.

08:21Build the code.

08:29There are no errors, let's flash it.

08:33Select SDM32 application.

08:36Click OK, and wait for the debugger to launch.

08:54As you can see, the characters are being printed but quite not what we want.

08:58This is happening due to the delay missing in the enable pin strobe.

09:19Let's enable the delay, and flash the code again.

09:22If you face the problem again, try increasing or decreasing this delay.

09:52As you can see, the data is being printed properly.

09:56Let me just reset the controller again.

10:06ASCII characters will continue to print from 0 to 128, every 250 milliseconds.

10:22This is it guys.

10:41I hope you understood the video.

10:44This video was made on demand, as I got many requests for this.

10:49Keep watching.

10:50Have a nice day.

STM32 LCD Tutorial | 16x2 LCD in 4-Bit Mode (No I2C, Full HAL Code Walkthrough)

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