Few suggestions after reading

[leshow]

I finished the book. I really loved it, thank you so much for taking the time to write it, it was really fun trying some embedded programming for a change.

I have a few suggestions, you can close this issue if it's not the right place for it.

• I'd like to know more how you found some of the information about the MCU from the reference manual. There's a few spots where you say how you gleaned the required information from the reference manual, it'd be nice to see more of that. For example, through the USART chapter I had no idea how you know to write to the TDR register, to check the ISR bit is clear to to know you can write to TDR.

• in the i2c chapter I still don't get how the master-slave dance really works. I read the I2C section in the reference manual and I don't fully understand how you figured out what to do from it. I guess it's a bit of a skill you develop over time but it felt really opaque to me.

• Some information on the structure svd2rust produces for crates like stm32f30x. It took a while for me to 'get' it. RegisterBlock closures for example, or what methods are available on which types; can I set_bit on this? Or does it only support read/write/modify?

• Some stuff that was abstracted in init I'd like to know more about. Why do you need to constrain RCC or FLASH? Why split() the GPIOx registers?