diff options
| -rwxr-xr-x | cores/arduino/Arduino.h | 2 | ||||
| -rw-r--r-- | cores/arduino/hooks.c | 31 | ||||
| -rw-r--r-- | cores/arduino/wiring.c | 1 |
3 files changed, 34 insertions, 0 deletions
diff --git a/cores/arduino/Arduino.h b/cores/arduino/Arduino.h index d4a22a6..f03c2bc 100755 --- a/cores/arduino/Arduino.h +++ b/cores/arduino/Arduino.h @@ -34,6 +34,8 @@ extern "C"{ #endif +void yield(void); + #define HIGH 0x1 #define LOW 0x0 diff --git a/cores/arduino/hooks.c b/cores/arduino/hooks.c new file mode 100644 index 0000000..641eabc --- /dev/null +++ b/cores/arduino/hooks.c @@ -0,0 +1,31 @@ +/* + Copyright (c) 2012 Arduino. All right reserved. + + This library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + This library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. + See the GNU Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with this library; if not, write to the Free Software + Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA +*/ + +/** + * Empty yield() hook. + * + * This function is intended to be used by library writers to build + * libraries or sketches that supports cooperative threads. + * + * Its defined as a weak symbol and it can be redefined to implement a + * real cooperative scheduler. + */ +static void __empty() { + // Empty +} +void yield(void) __attribute__ ((weak, alias("__empty"))); diff --git a/cores/arduino/wiring.c b/cores/arduino/wiring.c index a3c4390..5cbe241 100644 --- a/cores/arduino/wiring.c +++ b/cores/arduino/wiring.c @@ -111,6 +111,7 @@ void delay(unsigned long ms) uint16_t start = (uint16_t)micros(); while (ms > 0) { + yield(); if (((uint16_t)micros() - start) >= 1000) { ms--; start += 1000; |