Question

An analog to digital converter returns 16 bit values. Bits 7-0 are the converted value. Bit 8. 8 is an error flag. If it's set (1) the conversion failed and the value is corrupted Given an array of 12 16-bit readings, write an algorithm using Standard Program Structures to copy the valid readings to an 8-bit "valid" array. Only values with bit 8 clear (0) should be copied For example: ox01f>nothing copied. Oxooff > ff copied to valid array

Answer 1

ALGORITHM:

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INPUT: array ADC of 12 16bit-values

OUTPUT: array VALID of 12 8bit-values

j $\leftarrow$0

for i $\leftarrow$0 to 11 do

if ADC[i]<0x0100 then

temp=ADC[i] & 0x00ff // bitwise AND operation to extract bits 7-0 only

VALID[j] $\leftarrow$temp // copy converted value to array VALID's j'th position

increment j

endif

endfor

return VALID

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