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everyone welcome to controllers tech
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this is the second video in the next ian
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in this video we will see how to send
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some string from the stm32 mcu to the
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let's start with the next ian editor
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i am going to name it strings
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select your display type
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and display orientation
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i am going to add a background picture
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i have few images resized to fit this
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so i will use one of those you can check
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the introduction video
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if you want to know about how to resize
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let's add a picture element to this
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let's resize it i think we need to link
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it to the image first
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so now the entire screen is covered with
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let's add a text field where we will
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note the object name for this field as
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we will use it in our code
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this have the object's name as t0
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the second text file have object name as
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this white background looks weird
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let's make some changes in this
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click style and select cropped image
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now in the pic select the same image
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that you have for the background
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do the same for the second text field
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now let's add the fonts if you already
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fonts you can load them or else generate
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this looks good let's save it
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add the fonts to your project now let's
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change the text color also
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this is all we need for this project
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click save and compile this
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let's debug this project to see how the
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sending and receiving works
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so this is how our final display will
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this here we can send the commands to
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let's send some string to the first
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here t 0 is the object name text is the
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and hello is the string that i want to
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as you see we have the string on the
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also note that there are no spaces in
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between the entire command
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let's see this command in hexadecimal
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here we have t 0 dot t
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this is the command we sent and it is
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followed by zero cross ff
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let's send the string to the object t1
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here you can see the string is again
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0 cross ff so basically
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whenever we send some command to this
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display we need to send this
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3 times 0 cross ff in the end
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let's upload this to the display
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i have my ttl device connected to the
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connect the rx to tx and tx to rx
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as shown in the figure
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click upload select the com port and
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you can see the uploading has begun
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i will fast forward this part
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and there we go we have the new content
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now let's start the cube id
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give some name to this project and click
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let's start our basic setup and enable
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the external crystal for the clock
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select uart so that we can communicate
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make sure that you select the board rate
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it won't work with any other board rate
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these are the tx and rx pins for the
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let's go to the clock setup now i have
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eight megahertz crystal
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and i am running the controller at 72
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click save to generate the project
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let's start the programming part now
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first of all i am creating an array of
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they are 0 cross ff three times
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now let's create a function to send the
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string to the display
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this function will take two parameters
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first is the object name and second is
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the string that we want to send
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now let's create a buffer to store all
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i will use s print f to combine all the
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the format was object name dot text
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now send this buffer via the uart
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and then send the end commands
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now i am going to center low in t0 and
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we got some errors oh this is supposed
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now we have no errors but few warnings
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this one is about s print f so let's
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include the stdio.h file
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i still have one warning and that's
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because i am trying to pass the pointer
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to the character here
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so i will just die cast this
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all looks okay let's debug the code now
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let's run this so we hit the break point
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when i step over this function the
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string got updated in t0
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i will just remove the breakpoint now
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and let it run freely
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let's have a bit more fun with this
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so i will send these set of strings
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and you can see the strings are being
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updated every two seconds
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so we saw how can we send the string to
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the next ian display
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this is it for this video in the next
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i will cover the buttons where we will
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see how to receive data from the display
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whenever a button is pressed and how to
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you can download the related files from
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the description of this video
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keep watching and have a nice day ahead
