terom@8: #ifndef QMSK_SWITCH_H
terom@8: #define QMSK_SWITCH_H
terom@8: 
terom@8: #include "stdlib.h"
terom@8: 
terom@8: extern byte switch_mask;
terom@8: 
terom@8: /*
terom@8:  * Setup switch input triggering on SWITCH_DDR/PORT/PIN using SWITCH_PCMSK/PCIE/PCIF interrupts.
terom@8:  */
terom@8: void switch_init (void)
terom@8: {
terom@8:     switch_mask = SWITCH_MASK;
terom@8: 
terom@8:     // input mode
terom@8:     byte bit = 1;
terom@8: 
terom@8:     for (byte i = 0; i < 8; i++) {
terom@8:         if (SWITCH_MASK & bit) {
terom@8:             cbi(SWITCH_DDR, i);
terom@8: 
terom@8:             // pull-up
terom@8:             sbi(SWITCH_PORT, i);
terom@8:         }
terom@8: 
terom@8:         bit <<= 1;
terom@8:     }
terom@8: 
terom@8:     // interrupt mask for port
terom@8:     *SWITCH_PCMSK = SWITCH_MASK;
terom@8: 
terom@8:     // enable interrupts
terom@8:     sbi(&PCICR, SWITCH_PCIE);
terom@8: }
terom@8: 
terom@8: /*
terom@8:  * Update switch state if changed.
terom@8:  *
terom@8:  * Returns 1 if changed, 0 if no changes.
terom@8:  *
terom@8:  * TODO: debouncing
terom@8:  */
terom@8: byte switch_read (byte *sp);
terom@8: 
terom@8: #endif