TIVA Launchpad TM4C123 Part 2 - Push Button

-
SW1 Push button is connected to PF0 Pin, SW2 Push button is connected to PF4 Pin. Notice that there is no pull up resistor connected to SW1 or SW2. To use SW1 and SW2 we need to enable the internal pull-up resistor for PF0 and PF4 pins.

Steps for Switching Green LED on SW1 push and RED Led on SW2 Push

 1. Enable the clock to PORTF
2. Set the Direction Register PF4, PF0 as input and PF1, PF3 as output
3. Select the Digital I/O feature of PORTF
4. Enable the pull-up resistor option in PUR register for PF0 and PF4 pins
5. Read GPIODATA value and set the LED depending on which button is pressed
6. Repeat Step 5

For SW2, extra steps need to be taken as PF0 pin to which SW2 is shared with NMI. To prevental accidental write to configuration registers and thus NMI, the configuration register bits for PF0 are normally locked. It may be unlocked by writing a passcode value of 0x4C4F434B to the LOCK register followed by setting bit 0 of the commit register.

main.c



Now press SW1 and you can GREEN led will ON and pressing SW2 will make RED led ON

Comments

  1. KERİM T.3 April 2021 at 09:23

    Hi sur I deal with a problem in tiva c could you please help me about this subject?

    ReplyDelete

Post a Comment

Popular posts from this blog

bb.utils.contains yocto

-
Image
bb.utils.contains  is most commonly used function in Yocto. grep in poky directory returned with 696 count. $ grep -nr 'bb.utils.contains' poky/ | wc -l 696 It's definition is present in 'poky/bitbake/lib/bb/utils.py' file This function returns third argument if the second argument is subset of the first argument else returns fourth argument Let's take an example to understand this. You can see from the above screenshot, when the second argument is a subset of first argument, "present" was returned, else "notpresent" was returned We can also use bb.utils.contains inside if loop. This we can use inside a recipe. if ${@bb.utils.contains('SOMEFLAG','NEWVALUE3','true','false',d)}; then     FOO = 'HELLO' fi
Read more

make config vs oldconfig vs defconfig vs menuconfig vs savedefconfig

-
Image
Building the Linux Kernel is a two-step process: Configuring the Kernel options Building the Kernel with those options. There are many methods available for configuring the kernel. make config: Text-based Configuration.  Options are prompted one after another. All options need to be answered Access to former options is not possible make menuconfig: Menu-driven user interface Allows to navigate forwards and backward directly between features Allows to load and save files with filenames different from ".config" Provides search feature It uses ncurses library for GUI. If the ncurses library is not installed, make menuconfig option fails. To install ncurses library on Ubuntu: sudo apt-get install libncurses5-dev make defconfig: Creates a ".config" file with default options from the ARCH supplied defconfig Configurations are generally stored in the directory: arch/$(ARCH)/configs $ ls arch/x86/configs/ i386_defconfi
Read more

PR, PN and PV Variable in Yocto

-
PN : Represents the name of the recipe. The name is usually extracted from the recipe file name. PR:  Represents the revision of the recipe. Default value for this revision is "r0". Subsequent revisions of the recipe conventionally will have "r1", "r2" and so on. PV:  Represents the version of the recipe. Normally extracted from the recipe file name. For example: ffmpeg_3.4.2.bb recipe. ${PN} : ffmpeg ${PV} : 3.4.2
Read more