John-Michael Reed
Testing timer issues
main.cpp@3:8ca8be33da99, 2013-04-09 (annotated)
- Committer:
- vaxon
- Date:
- Tue Apr 09 01:20:54 2013 +0000
- Revision:
- 3:8ca8be33da99
- Parent:
- 2:2380496d04fd
Cleaner example. ; At 100ns, the green LED blinks on .25sec, off .75sec and serial prints "j"; At 20 it is locked up.
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| vaxon | 0:f0632b06ba00 | 1 | #include "mbed.h" |
| vaxon | 3:8ca8be33da99 | 2 | DigitalOut led(PTB19); //green |
| vaxon | 0:f0632b06ba00 | 3 | Serial pc(USBTX, USBRX); // tx, rx |
| vaxon | 0:f0632b06ba00 | 4 | |
| vaxon | 0:f0632b06ba00 | 5 | Ticker period; |
| vaxon | 0:f0632b06ba00 | 6 | |
| vaxon | 0:f0632b06ba00 | 7 | uint16_t j=0; |
| vaxon | 0:f0632b06ba00 | 8 | |
| vaxon | 0:f0632b06ba00 | 9 | void tick() |
| vaxon | 0:f0632b06ba00 | 10 | { |
| vaxon | 0:f0632b06ba00 | 11 | |
| vaxon | 3:8ca8be33da99 | 12 | if (j<2500) { |
| vaxon | 0:f0632b06ba00 | 13 | led=0; |
| vaxon | 0:f0632b06ba00 | 14 | } else { |
| vaxon | 0:f0632b06ba00 | 15 | led=1; |
| vaxon | 0:f0632b06ba00 | 16 | } |
| vaxon | 0:f0632b06ba00 | 17 | |
| vaxon | 3:8ca8be33da99 | 18 | j++; |
| vaxon | 0:f0632b06ba00 | 19 | j%=10000; |
| vaxon | 0:f0632b06ba00 | 20 | |
| vaxon | 0:f0632b06ba00 | 21 | } |
| vaxon | 0:f0632b06ba00 | 22 | |
| vaxon | 0:f0632b06ba00 | 23 | int main() |
| vaxon | 0:f0632b06ba00 | 24 | { |
| vaxon | 3:8ca8be33da99 | 25 | // period.attach_us(tick,100); // serial and blink work |
| vaxon | 3:8ca8be33da99 | 26 | period.attach_us(tick,20); //nope |
| vaxon | 0:f0632b06ba00 | 27 | |
| vaxon | 0:f0632b06ba00 | 28 | |
| vaxon | 3:8ca8be33da99 | 29 | while (1) { |
| vaxon | 3:8ca8be33da99 | 30 | pc.printf("j: %d\n\r",j ); |
| vaxon | 3:8ca8be33da99 | 31 | |
| vaxon | 3:8ca8be33da99 | 32 | } |
| vaxon | 0:f0632b06ba00 | 33 | |
| vaxon | 0:f0632b06ba00 | 34 | } |