STK 500 Switches
Guest
#831693
Hello, I connected the swiches to Port C and Config PortC = Input. The programm shall show me a binary and decimal number to detect which switch is pressed down. Dim deci as integer Dim binar as byte 'configuration of the display: I did not write it down here, because the display is working correctly. do upperline lcd deci lowerline lcd binar loop If you see a mistake, I thank you for any help Frank wrote: > The programm shall show me a binary and decimal number to detect which > switch is pressed down. Then you schould read the input port inside your loop. > Dim deci as integer > Dim binar as byte I'm sure, the name of a variable has no influence, how it was displayed. Peter
Guest
#831713
ok, but if I add "deci = portc" and "binar = portc" into the loop, the display shows only a "0" and does not change, when I press a switch. Hi Frank,
your problem is verry simple. If you want to write a byte value to PORTC
you have to configure the data direction (DDRC=0xFF) as output and write
data to PORT register.
But if your PORT is configured as input (DDRC=0x00)the PORT register
will enable/disable the internal pull up resistor. If you want to read
in external values you have to read pin register (PINC).
Summary:
1. data output
DDRC = 0xFF, write data to PORTC
2. data input
DDRC = 0x00, PORTC = 0x00(pull up resistors disabled),
read data from PINC
Your loop should be: "deci = PINC" and "binar = PINC"
Greetings Alexander
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