Hi all. I'm using a 4x3 matrix keypad for the input of floating point numbers into the uC. I'm using this procedure to interpret the values for the FP number:

1. Declare a variable called dec_counter

2. Detect whether a key is pressed. If not, repeat 2.

3. If the key is not '.' (decimal point or '#' (Enter), convert key to decimal value and increment dec_counter.

4. If the key is '.', stop incrementing dec_counter for subsequent loops.

5. If the key is '#' (Enter), go to step 6. Else repeat steps 2 to 5.

6. Depending on dec_counter, adjust values accordingly. Eg: If the keys 123.45 are pressed one at a time, i'll multiply 1 with 100, 2 with 10, 3 with 1, 4 with 0.1 and 5 with 0.01.

7. After that, I'll add all these values together to get the floating point number I want.

This procedure is using a lot of overhead though. To get the floating point no, I need to do a lot of floating point multiplications and additions. Anyone has better ideas on how to interpret a floating point number that is input through a matrix keypad?

Thanks