It seems that in the provided code example the ov flag is set when the result of a SUB instruction is negative or am I wrong?
/* compare with low_thr; wake up if value < low_thr */
move r3, low_thr
ld r3, r3, 0
sub r3, r0, r3
jump wake_up, ov
https://github.com/espressif/esp-idf/bl ... /ulp/adc.S
When is overflow flag set for SUB instruction?
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