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hello everyone welcome to controllers
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today in this tutorial we will interface
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df player mini with stm32
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df player works with very simple
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which needs to be transmitted using uart
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let's start by creating a project in
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first i am using stm32f103 for this
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give some name to the project and click
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here is our cube mx i am selecting
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external crystal for the clock
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select serial wire debug
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i am using ut1 to send commands
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make sure the board rate is 9600 bits
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i am going to use three buttons to
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that's why i am selecting these pins as
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let's go to the clock setup now i have
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eight megahertz external crystal
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and i want the controller to run at 72
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click save to generate the project
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first of all we need to copy the library
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so copy the c file to source and header
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file to include directory
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click refresh and you can see the files
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let's take a look at the data sheet
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as you can see here it supports fat 16
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fat 32 formats for the sd card
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there are 30 levels of volume and other
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you can read them as mentioned here
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the default board rate is 9600
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and now the very important thing the
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standby current is 20 milliamperes
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i will tell you more about this in a
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this is the diagram of df player mini
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we are going to use only this side
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let's take a look connection now i am
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using external power supply
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rx pin from the df is connected to tx
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pin of the controller
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which is pin pa9 and tx pin
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from the df is connected to rx pin of
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which is pin pier 10. speaker 1 and
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speaker 2 pins are connected to the
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and negative of the speaker
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these three buttons are connected to pin
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this button is for previous selection
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this one is for pause or play
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and this is for next song selection
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coming back to the external power supply
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while testing i found that df player
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needs around 25 milliampere of current
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during the song is playing f103 was not
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able to supply this much current
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even with the usb connected so
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i switched to the external power supply
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even in the data sheet it's mentioned
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that it takes 20 milliamperes of idle
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let's go back to our main file
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we need to include the library in our
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let's see the df dfplayer.c file now
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here you can change the uart according
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to the one you are using
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the source is defined as from the sd
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i will get back to this in a while
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define the pins that you are using for
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let's see these defines now
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start byte is zero cross seven e
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end byte is zero cross e ef
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the command sent to the df player have a
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and that is start byte
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version command length command feedback
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parameter 1 parameter 2 16-bit checksum
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the command length is 6 as mentioned
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because it does not count the start
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check sum and the end bytes
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we are not going to use feedback so i
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have defined it 0 here
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send command function will send the
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command to the df player
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it first calculates the checksum
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the command sequence is same here too
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we have start byte version command
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command feedback parameter 1
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parameter 2 check sum high byte lower
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and then it sends this array to the uart
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df in it is to initialize the player and
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it takes volume as the parameter
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basically we send zero cross three f
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you can see here this is the command to
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initialize the player
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and we need to send the parameters also
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if you scroll down the example is
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provided in the data sheet
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this is the sequence of commands need to
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for the tf card we have command
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feedback parameter 1 and parameter 2.
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the parameter 2 is 0 cross 0 2 for the
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that's why i have defined it as source
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you can change it and see the other
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parameters in the data sheet
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then it sets the volume
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0 cross 0 6 is the command to set the
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along with the parameter which acts as a
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df next function is to play the next
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this command does not need any parameter
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this is command to play previous song we
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check key function checks if the key is
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if the song is playing then it will be
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paused or if it is paused
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then it will resume the play then we
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have a button for previous
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and a button for next song
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now let's start programming
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initialize the df player i am keeping
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start the play from the first song
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in the while loop we will keep checking
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for the button pressed
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let's build and debug this
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before starting i want to show you my sd
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there are six mp3 files
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you should also number them like i have
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done it here let's run this
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this is it guys i hope you understood
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how to program this df player mini
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you can download the code from the link
