XIAO_BLE wakes up from System_ON_Sleep and Writes weather data to on-board Flash

Products & Technology XIAO
33

The external Flash is W25Q128JV (Winbond), connected via SPI, with unused WP and HOLD pins pulled up.
The current flowing into the VCC pin is measured.
The command sequence is:
flash.begin() -->enter–>release–>flash.begin().

  1. Using SPI.transfr(),
    5.7uA–>0.26uA–>5.7uA–>5.7uA
  2. Using runCommand(),
    5.7uA–>300uA–>600uA–>5.7uA
    External Flash does not seem to execute runCommand() correctly.
  3. “0x66”,“0x99” is used instead of “0xAB”, the result is the same as 2.