I have just started in the field of Embedded System Firmware Development, and I was working on a project with Portenta H7, I really find it overwhelming sometimes. I want to learn baremetal development, for example I was searching for timers [although i have very few idea about these terms watchdog, interrupts, timer , ISR] I was trying to implement a simple baremetal timer . Then I found this forum where some one just implemented a timer using the regs directly , with least abstraction. this "Thread"
Please guide me with some steps/resources , to learn more about ARM , MCU/MPU Architecture , and Firmware Development also how can I begin with Portenta H7 , as i found out STMCube IDE Doesnt supports the Portenta H7 board directly , and also the bootloader is different.
i have searched for some yt channels and books till now and I starting from there.
I just want a roadmap nothing else, stages, topics etc to cover