How to write a program in keil1. Install keil2. Open keil3. Select new project4. Select your device from the list5. Select new file6. Type your code7. Save it8. Itll ask for the name 9. Use any name and give the extension accordingly. Ex. .c or .asm10. Click the source and select add file11. Add the created c file12. Click build 13. If theres no error itll show 0 errors14. Done