samples: drivers: adc: update temperature LUT and reference ADC fixes - #875
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Test the internal temperature sensor readings against the recalibrated ADC and the accompanying driver/HAL changes. - Replace the temperature lookup table with the recalibrated data covering ADC codes 885..1341 (-39.9 C .. 85.0 C). - Store the table as int16 tenths of a degree indexed directly by (adc_value - ADC_TEMP_MIN), replacing the float 2D array and linear search with an O(1) lookup and a smaller footprint. - Return -255.0 instead of -1 for out-of-range ADC codes and update the sample to check for the new sentinel. Signed-off-by: Juho Eskeli <juho.eskeli@alifsemi.com>
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Test the internal temperature sensor readings against the recalibrated ADC and the accompanying driver/HAL changes.