I want to write a bootloader for the Tiva ${?}^{TM}$ TM$4$C$123$GH$6$PM$.$ However, I do not know in which IDE and in which language it should be written. This is my first experience. I only know that a bootloader is a software that allows us to program a microcontroller using USB without a programmer and that it is loaded into flash memory. But I do not know how to load it into flash memory and how to write this software myself. Also, I do not know how it enables programming via USB instead of using a programmer. Can anyone help?