SPIFlashWrite is called when WiFi config is changed. If you are joining the same network, you don't need to call WiFi.begin, SDK will join the last network without writing anything to flash.
Flash is also written when using SPIFFS, EEPROM, and doing OTA.
By the way, this is related to #836. As a summary, PWM needs the following things fixed:
move timer handler and PWM routines into RAM (need to free up some RAM to do that, possibly by removing espconn from liblwip.a, or moving some strings into flash)
use NMI instead of regular interrupt
refactor existing critical sections in PWM routines
Using a sine to binary 16 bit number generator I programmed those numbers into a pair of 2716 eproms to get the 16 bit wide sine number 'lookup table' or in this case 'conversion table'. It works incredibly well and my sine/cosine generator drives a large X/Y C.R.T. P.P.I. (Plan Position Indicator 'think radar'). The display has 64K of pixels and the memory storage has the feature of OR'ing old data with new data that will leave a trail behind any moving object. Best wishes on your project.
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