EmbedEd
/
mbed_theremin
xypad theremin for LPC1768
jswitch.cpp@2:c5eeaf1c8e69, 2016-03-14 (annotated)
- Committer:
- exopiped
- Date:
- Mon Mar 14 23:43:44 2016 +0000
- Revision:
- 2:c5eeaf1c8e69
- Parent:
- 1:aa184d2eb2e3
touch screen driver glitches removed; debug statements commented out
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
exopiped | 0:8ee38453bad9 | 1 | /* |
exopiped | 0:8ee38453bad9 | 2 | * jswitch.cpp -- debounces and reads pins 12 |
exopiped | 0:8ee38453bad9 | 3 | * (SW_DOWN), 13(SW_LEFT),14(SW_CENTER),15(SW_UP), |
exopiped | 0:8ee38453bad9 | 4 | * and 16(SE_RIGHT) of the mbed 40 pin dip board |
exopiped | 0:8ee38453bad9 | 5 | */ |
exopiped | 0:8ee38453bad9 | 6 | #include "mbed.h" |
exopiped | 0:8ee38453bad9 | 7 | #include "debug.h" |
exopiped | 0:8ee38453bad9 | 8 | #include "jswitch.h" |
exopiped | 0:8ee38453bad9 | 9 | |
exopiped | 0:8ee38453bad9 | 10 | #define JS_BLANKING_MSEC 333 |
exopiped | 0:8ee38453bad9 | 11 | |
exopiped | 0:8ee38453bad9 | 12 | DigitalIn js_down(p12); |
exopiped | 0:8ee38453bad9 | 13 | DigitalIn js_left(p13); |
exopiped | 0:8ee38453bad9 | 14 | DigitalIn js_center(p14); |
exopiped | 0:8ee38453bad9 | 15 | DigitalIn js_up(p15); |
exopiped | 0:8ee38453bad9 | 16 | DigitalIn js_right(p16); |
exopiped | 0:8ee38453bad9 | 17 | |
exopiped | 0:8ee38453bad9 | 18 | Timer js_timer; |
exopiped | 0:8ee38453bad9 | 19 | |
exopiped | 0:8ee38453bad9 | 20 | static unsigned char js_oldest=0; |
exopiped | 0:8ee38453bad9 | 21 | static unsigned char js_older=0; |
exopiped | 0:8ee38453bad9 | 22 | static unsigned char js_old=0; |
exopiped | 0:8ee38453bad9 | 23 | static unsigned char js_now=0; |
exopiped | 0:8ee38453bad9 | 24 | static unsigned char js_official=0; |
exopiped | 0:8ee38453bad9 | 25 | static int js_msec=0; |
exopiped | 0:8ee38453bad9 | 26 | |
exopiped | 0:8ee38453bad9 | 27 | void js_init(void) |
exopiped | 0:8ee38453bad9 | 28 | { |
exopiped | 0:8ee38453bad9 | 29 | js_official = 0; |
exopiped | 0:8ee38453bad9 | 30 | js_now = 0; |
exopiped | 0:8ee38453bad9 | 31 | js_old = 0; |
exopiped | 0:8ee38453bad9 | 32 | js_older = 0; |
exopiped | 0:8ee38453bad9 | 33 | js_oldest = 0; |
exopiped | 0:8ee38453bad9 | 34 | js_timer.start(); |
exopiped | 0:8ee38453bad9 | 35 | } |
exopiped | 0:8ee38453bad9 | 36 | /* |
exopiped | 0:8ee38453bad9 | 37 | * js_debounce -- button presses will not be reported |
exopiped | 0:8ee38453bad9 | 38 | * any more that once every 333 msec. |
exopiped | 0:8ee38453bad9 | 39 | */ |
exopiped | 0:8ee38453bad9 | 40 | void js_debounce(void){ |
exopiped | 0:8ee38453bad9 | 41 | if ((js_timer.read_ms()-js_msec)>JS_BLANKING_MSEC) { |
exopiped | 0:8ee38453bad9 | 42 | if (js_official==0) { |
exopiped | 0:8ee38453bad9 | 43 | js_oldest = js_older; |
exopiped | 0:8ee38453bad9 | 44 | js_older=js_old; |
exopiped | 0:8ee38453bad9 | 45 | js_old=js_now; |
exopiped | 0:8ee38453bad9 | 46 | js_now = ( (js_center << 4) |
exopiped | 0:8ee38453bad9 | 47 | | (js_up << 3) |
exopiped | 0:8ee38453bad9 | 48 | | (js_down << 2) |
exopiped | 0:8ee38453bad9 | 49 | | (js_left << 1) |
exopiped | 0:8ee38453bad9 | 50 | | js_right ); |
exopiped | 0:8ee38453bad9 | 51 | js_official|=(js_now&js_old&js_older&js_oldest); |
exopiped | 0:8ee38453bad9 | 52 | if (js_official>0) { |
exopiped | 0:8ee38453bad9 | 53 | js_msec=js_timer.read_ms(); |
exopiped | 0:8ee38453bad9 | 54 | } |
exopiped | 0:8ee38453bad9 | 55 | } else { |
exopiped | 0:8ee38453bad9 | 56 | js_now=0; |
exopiped | 0:8ee38453bad9 | 57 | js_old=0; |
exopiped | 0:8ee38453bad9 | 58 | js_older=0; |
exopiped | 0:8ee38453bad9 | 59 | js_oldest=0; |
exopiped | 0:8ee38453bad9 | 60 | } |
exopiped | 0:8ee38453bad9 | 61 | } |
exopiped | 0:8ee38453bad9 | 62 | } |
exopiped | 0:8ee38453bad9 | 63 | /* |
exopiped | 0:8ee38453bad9 | 64 | * js_read -- reads buttons indicated by the mask. |
exopiped | 0:8ee38453bad9 | 65 | * once read the masked button indications are cleared |
exopiped | 0:8ee38453bad9 | 66 | */ |
exopiped | 0:8ee38453bad9 | 67 | unsigned char js_read(unsigned char mask) |
exopiped | 0:8ee38453bad9 | 68 | { |
exopiped | 0:8ee38453bad9 | 69 | unsigned char retval; |
exopiped | 0:8ee38453bad9 | 70 | |
exopiped | 0:8ee38453bad9 | 71 | retval = js_official & mask; |
exopiped | 0:8ee38453bad9 | 72 | js_official &= ~retval; |
exopiped | 0:8ee38453bad9 | 73 | return retval; |
exopiped | 0:8ee38453bad9 | 74 | } |
exopiped | 0:8ee38453bad9 | 75 | |
exopiped | 0:8ee38453bad9 | 76 |