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PROGMEM is a keyword used when declaring a variable that keeps the data in flash instead of copying it into SRAM. It is part of the `pgmspace.h` library. Use this tag for discussions about using this attribute.
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Why can I not use pointers instead of array with PROGMEM?
However, following the more usual pattern of:
const prog_char testStringD[] PROGMEM = "JKL";
works fine. … So it is clear the pointer and PROGMEM results in the string/array not being initialised.
Why is this? …