Microcontroller Matrix Keyboard - 8051 - SDCC
Submitted By:
andrade.manoel
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"C" function kbd_rdchr() for SDCC 8051
microcontroller. It does not riqueres
interrupts or timers. Just call it when
your program needs to read a key, it also does not queue those keys in any way.
This function handles a 3x4 matrix keyboard conected at port definde as "kdb_port"
kdb_port pins from 7 to 4 manages col from 1 to 3
kdb_port pins from 3 to 0 manages row (also lines) from 1 to 4.
It is possible to deal with a 4x4 matrix keyboard just changing "kdb_cnt_col" variable value from 3 to 4."
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File Name:
F:\eletrica\tecl_mat2a.c
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