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hossein hosseini
hossein hosseini
Associate III
October 30, 2017
Question

how can i use LCD 4*20 in IAR with CMSIS?

  • October 30, 2017
  • 8 replies
  • 1229 views
Posted on October 30, 2017 at 09:18

hi.

i want to use LCD 4*20 in IAR with CMSIS  , but i didn't found any library for this.

and if i dont want to write a library for lcd , what do i do ?

where do i can found this library?

or shall i write this library?

or if i want to get like this library , where can i found them?

thanks.

    This topic has been closed for replies.

    8 replies

    S.Ma
    S.Ma
    Principal
    October 30, 2017
    Posted on October 30, 2017 at 09:44

    Can you be more specific? 4x20 LCD even on google will show many various parts available.

    I was using a 2x20 char by SPI (GPIO+SW) from Ampire, and created a simple init and printf for it, years back.

    Imen.D
    ST Technical Moderator
    October 30, 2017
    Posted on October 30, 2017 at 14:59

    Hello

    hosseini.hossein

    ,

    Please provide more details about your case and the device you are using, so that it will be easier to help/answer you.

    Kind Regards

    Imen

    In order to give better visibility on the answered topics, please click on 'Best answer' on the reply which solved your issue or answered your question. Thanks
    Andrew Neil
    Andrew Neil
    Super User
    October 30, 2017
    Posted on October 30, 2017 at 16:56

    i want to use LCD 4*20 in IAR with CMSIS

    The LCD neither knows nor cares what processor you have, and what tools you use to program it.

    The process will be the same whatever processor and tools you use.

    The only thing that's specific to the chip is how to use the IO lines; ie,

    • set an output line high
    • set an output line low
    • read an input line

    You can learn how to do those things with simple LEDs &  switches!

    A complex system that works is invariably found to have evolved from a simple system that worked.A complex system designed from scratch never works and cannot be patched up to make it work.
    Tesla DeLorean
    Tesla DeLorean
    Guru
    October 30, 2017
    Posted on October 30, 2017 at 19:01

    I think the 16x2 display code from things like Keil would work in IAR with very minimal changes.

    Determine WHAT controller the LCD has, then Google that, should dump out hundreds of examples that can be ported with minimal effort, and a basic understanding of the GPIO initialization/control specific to the STM32 family.

    Tips, Buy me a coffee, or three.. PayPal Venmo (See Profile) Up vote any posts that you find helpful, it shows what's working..
    hossein hosseini
    hossein hosseiniAuthor
    Associate III
    October 31, 2017
    Posted on October 31, 2017 at 11:05

    hi all.

    oh, i'm sorry that i forgot to say which lcd i use that. and thanks for your answer.

    i use hd44780 lcd 4*20 and stm32f103re  with IAR IDE and spl library.

    i know gpio , but i dont know if i want to use a

    module to connect the stm  like lcd, what do i do? write the base code for lcd  or no , there is a library for lcd and where do i can found it ??

    thanks.

    S.Ma
    S.Ma
    Principal
    October 31, 2017
    Posted on October 31, 2017 at 11:36

    Google or Qwant on 

    stm32 hd44780 example

    It seems there are lots of results out there.

    Andrew Neil
    Andrew Neil
    Super User
    October 31, 2017
    Posted on October 31, 2017 at 14:24

    KIC8462852 EPIC204278916 wrote:

    It seems there are lots of results out there.

    Indeed. 

    The HD44780 has been available for around 30 years now!

    https://en.wikipedia.org/wiki/Hitachi_HD44780_LCD_controller

     
    A complex system that works is invariably found to have evolved from a simple system that worked.A complex system designed from scratch never works and cannot be patched up to make it work.
    Imen.D
    ST Technical Moderator
    October 31, 2017
    Posted on October 31, 2017 at 14:02

    Hi,

    Have a look to this

    http://www.st.com/content/ccc/resource/technical/document/application_note/07/1a/31/66/f9/8e/46/d3/DM00046039.pdf/files/DM00046039.pdf/jcr:content/translations/en.DM00046039.pdf

    it may helps you as talks exactly about this HD44780 LCD: Application note Interfacing an HD44780 2-line LCD display with the STM8.

    Kind Regards

    Imen

    In order to give better visibility on the answered topics, please click on 'Best answer' on the reply which solved your issue or answered your question. Thanks
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