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hello everyone welcome to controllers
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Tech in my previous video I covered how
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to store data in the flash memory of
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f103 microcontroller it have memory
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distributed in pages today in this video
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we will see how to store data in the
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flash memory of those controller whose
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memory is distributed in sectors
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this would include cortex m4 & m7 series
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controllers I am using stm32f4 for 6r II
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here is the cube M X I am selecting
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external crystal for the clock we don't
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need to do any setup in the clock setup
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crystal is 8 megahertz and I want the
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system to run at 180 megahertz
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click Save to generate the project
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first we will include the library in the
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project copy the head of file into the
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include folder and C file into the
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source folder let's refresh the project
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and you can see the files here now
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include the flash sector dot H in the
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main file let's build it once to check
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for any errors there are no errors let's
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take a look at the flash sector dorsey
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file get sector is used to get the
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sector number where the memory address
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is located this is the reference manual
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for a four four six r e as you can see
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here we have seven sectors
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some of these are 16 kilobytes or 64
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kilobyte and rest are 128 kilobytes this
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is the manual for a 4:07 microcontroller
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this one have 11 sectors your controller
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may have fifteen or twenty three sectors
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also you have to comment out the number
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after sectors you have mine have seven
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sectors so I have commented the rest if
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you have 11 sectors include this portion
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also if you have 23 then include
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everything next flash right data will
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write the respective data to the flash
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memory it takes the memory address as
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the parameter along with the address of
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32-bit data variable that you want to
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it will first calculate the number of
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words based on the size of the data then
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it will get the starts Teta number based
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on the length of data it will calculate
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the memory location of the end sector
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and then the end sector number and
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finally the number of sectors needed to
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it will then erase the required sectors
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and write the data into the NetID memory
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flash read data reads the data from the
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memory and save it in the entered
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variable convert to STR converts the 32
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bits data into the string let's start
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now I am creating a 32 bit variable to
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store the string our X data will store
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the data that we will read from the
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memory string is to store the converted
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string flash write data will write the
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data to the given memory location I will
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use this memory address pass the address
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to the data flash read data will read
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the data from the same location and
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store it in the RX data and finally
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convert the received data to the string
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let's build it I will connect my
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controller now hit the debug button now
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I will add the memory location to
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this is data from my previous experience
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but we are writing in this location so
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that's where we need to focus I will add
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a breakpoint here so we hit the
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breakpoint let's step in
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number of words r8 based on the address
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it have determined that the start sector
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is sector four which is exactly where we
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chose the address and sector address
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will be calculated based on the number
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of words and the end sector number is
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also the same as start sector number of
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sectors needs to be deleted is one and
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now we will exit this function
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I will add rx data in the live
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as you can see the data is written here
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there were eight words so eight 32-bit
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memory locations are used let's read the
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data now the data is stored in the RX
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data array I have defined array of six
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words but I needed eight words anyway
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let's finish this execution
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so the converted data is stored in the
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string and off course it's not the
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entire data because of the size of our X
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let me quickly correct this I am
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increasing the size of the array and
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string also let's debug now
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okay you might also get this error if
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you try to debug again go to debug
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configuration debugger tab reset
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behavior and choose none click apply and
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data is already stored in the location
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so you won't see any change here our X
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data now have all the data
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and the string now shows the entire
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string this was the result of
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programming flash memory from the start
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of the sector let's see can we get the
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same result if we program the from end
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of the sector now I will start writing
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from this address and eight words means
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it will come up to this address here we
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are covering two sectors to write the
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data and that's exactly what we want to
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test this is the memory location of
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sector three and while writing data we
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will come to sector four
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let's see the address of this location
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the address is zero cross eight zero
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zero F F F four enter the memory
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location in the flash write data and in
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flash read data also
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let's enter in the flash write data the
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number of words are eight as the data is
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same start sector is sector three as
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that's where the address is located
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this is the address of the memory
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location where the data will be written
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up to this location is in Sector four
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the number of sectors needed to be
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note that this pre-written data here
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will be erased when the sectors are
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erased now our data has been stored in
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the desired memory location which covers
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two different sectors the same data can
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be read and converted to string also
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keep one thing in mind that the entire
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sector will be erased before writing
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data we cannot erase some particular
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memory location inside the sector not at
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least with hull functions this is it for
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the video guys I hope you understood it
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you can download the code from the link
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in the description have a nice day
