#23 RTOS Part-2: Automating the context switch

There is an in-depth RTOS course on YouTube. This hands-on course is based on the ARM Cortex-M processor and contains 7 videos about 30 minutes each: 1. Part-1: shows how to switch among multiple "superloops" on a single CPU and introduces the concept of the context switch 2. Part-2: shows how to automate the context switch and starts to build a small RTOS kernel 3. Part-3: shows how to automate the scheduling process and adds round-robin scheduling to the the RTOS kernel 4. Part-4: shows how to replace the inefficient busy-waiting (time delay) with efficient \*blocking\* and introduces the concept of thread states and the idle thread 5. Part-5: explains what "real-time" means a…

I would recommend you watch this guy on YouTube: link to this video He writes a ROUND ROBIN scheduler from scratch and he explains all what goes behind the scenes in a very clear and efficient manner

Inline Assembly code for arm-none-eabi-gcc compiler I am following RTOS lecture from here [video Here they are using Keil compiler and the syntax is different from gcc because the code is not working for me. The c variable that I want to implement here is Stack pointer defined in struct typedef struct { void *sp; /* stack pointer */ /* ... other attributes associated with a thread */ } OSThread; Here is the function where I want to manipulate the stack pointer. void PendSV_Handler(void) { asm ( "cpsid i\n\t" "ldr r1,%0\n\t" /* "ldr r1,=OS_curr\n\t" */ "ldr r1, r1, #0\n\t" "cbz r1,PendSV_restore\n\t"…