Using push buttons and switches
1
•Push buttons SW2 to SW5 on the Dragon Board are connected to bits 3 to 0 of
PortH
•When button is pushed, a corresponding bit of Port H is reset. What activity
level?
•Can be enabled/disabled:
•SW_enable();
•Can be checked with C function calls:
•SW1_dip(); //returns 8-bit reading of SW1-SW5. Non-blocking
•SW2_down(); // true if SW2 is down
•SW2_up(); //true if SW2 is up.
•Use
while ((PTH & 0x01)==0) //to check if the SW5 is being pressed
{
//…SW5 still pressed
}
//SW5 released
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