| ??? 12/12/10 21:23 Read: times |
#180106 - flags, semaphors and so on Responding to: ???'s previous message |
Suppose Your device is playing song.
Song is 2- dimensional array(note freq,note length) with some lenght . Suppose Timer0 - checks flag "ACTIVESONGPLAYING" . If flag is true - timer0 downcounts length of default note. When note expires , Timer0 increments pointer in array and extracts next note's length and frequency. - In same time this timer monitors 'mode button'.If button is detected - some flag "MODECHANGEREQUEST" is fired in Timer0 interrupt. Main routine will see flag "MODECHANGEREQUEST" and will change mode, if in this mode song is disabled - "ACTIVESONGPLAYING" will be cleared. Timer1 will play notes - it should be with highes priority (for clearer sound). Timer1 can be enabled permanently (and should check flag ACTIVE_SOUND_ENABLED) or can be enabled/disabled by main loop. |
| Topic | Author | Date |
| Using Interrupts to call functions | 01/01/70 00:00 | |
| what is Your target? | 01/01/70 00:00 | |
| Responding to: Stefan Kanev's previous message | 01/01/70 00:00 | |
| big task | 01/01/70 00:00 | |
| The next question | 01/01/70 00:00 | |
| flags, semaphors and so on | 01/01/70 00:00 | |
| Endless loops | 01/01/70 00:00 | |
main | 01/01/70 00:00 |