rtc_mem.py

#
# rtc_mem.py
#
# Memory pool in RTC memory.
#

from sys import platform

from mem_map import MemMap


class RTCMemory(MemMap):
    def __init__(self, layout):
        if platform == "linux":
            # testing only.
            import uctypes
            mem = bytearray(2048)
            ADDR = uctypes.addressof(mem)
        if platform == "esp32":
            # from ESP32 data sheet: 8kb from 0x5000_0000 to 0x5000_1fff
            #
            # Unfortunately, we can't obtain this value from micropython v1.14 itself,
            # so we use rtc_user_mem_data from linker map
            ADDR = 0x50000200
        RTC_MEM_SIZE = 2048 # default
        # some space for apps using RTC().memory(), e.g. RTC().memory('blah')
        RTC_MEM_RESERVED = 64
        super().__init__(ADDR + RTC_MEM_RESERVED,
                         RTC_MEM_SIZE - RTC_MEM_RESERVED,
                         layout)