ESP32 SPR
来自Jack's Lab
1 Overview
Speical Registers of ESP32 (Xtensa) hold the majority of the state added to the processor.
2 R/W SPR
rsr.* a2 wsr.* a2 xsr.* a2 <--- exchanges the values in a General Register (GPR) and a Special Register (SPR)
For example:
rsr.prid a2
3 PRID
Processor ID
PRID on the ESP108 architecture (ESP32) :
- 0xCDCD on the PRO processor
- 0xABAB on the APP CPU
We can distinguish between the two by simply checking bit 1: It's 1 on the APP and 0 on the PRO processor.