Texas Instruments Software Engineer interview questions

First there was a written round consisting of Aptitude(1 comprehension,1 Data interpretation comprehension,rest normal Mcqs,20 questions 40 minutes) And Technical Questions(20) comprising of Basic C,OS,Computer Architecture,few Network Questions. Then There was 1 technical Interview.They were looking for Embedded Software profile and so were lot more interested in OS,COA,Memory related functions like malloc,calloc.The worst part was despite of telling them I did not have any course on micro controller they asked me to write driver for something(I dont even remember that and that is why they rejected all of us).