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mirror of https://github.com/esp8266/Arduino.git synced 2025-04-22 21:23:07 +03:00
david gauchard 9a2ed274f3 polledTimeout: add option to use CPU count instead of millis() (#5870)
* polledTimeout: add option to use CPU count instead of millis()

* use more "using" alias

* more c++/clear code, using typename (thanks @devyte)

* rename class name to include unit, introduce timeMax() and check it with assert()

* remove useless defines

* improve api readability, add micro-second unit

* update example

* mock: emulate getCycleCount, add/fix polledTimeout CI test

* + nano-seconds, assert -> message, comments, host test

* allow 0 for timeout (enables immediate timeout, fix division by 0)

* typo, set member instead of local variable

* unify error message

* slight change on checkExpired() allows "never expired"
also removed printed message, add YieldAndDelay, simplify calculations

* remove traces of debug.h/cpp in this PR

* include missing <limits> header

* back to original expired test, introduce boolean _neverExpires, fix reset(), getTimeout() is invalid

* fix expiredOneShot with _timeout==0 check

* reenable getTimeout()

* expose checkExpired with unit conversion

* fix timing comments, move critical code to iram

* add member ::neverExpires and use it where relevant

* improve clarity

* remove exposed checkExpired(), adapt LEAmDNS with equivalent

* add API ::resetToNeverExpires(), use it in LEAmDNS

* remove offending constness from ::flagged() LEAmDNS (due do API fix in PolledTimeout)

* simplify "Fast" base classes

* minor variable rename

* Fix examples

* compliance with good c++ manners

* minor changes for consistency

* add missing const

* expired() and bool() moved to iram

* constexpr compensation computing

* add/update comments

* move neverExpires and alwaysExpired
2019-04-05 10:50:53 -03:00

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C++

// Wire Master Reader
// by devyte
// based on the example of the same name by Nicholas Zambetti <http://www.zambetti.com>
// Demonstrates use of the Wire library
// Reads data from an I2C/TWI slave device
// Refer to the "Wire Slave Sender" example for use with this
// This example code is in the public domain.
#include <Wire.h>
#include <PolledTimeout.h>
#define SDA_PIN 4
#define SCL_PIN 5
const int16_t I2C_MASTER = 0x42;
const int16_t I2C_SLAVE = 0x08;
void setup() {
Serial.begin(115200); // start serial for output
Wire.begin(SDA_PIN, SCL_PIN, I2C_MASTER); // join i2c bus (address optional for master)
}
void loop() {
using periodic = esp8266::polledTimeout::periodicMs;
static periodic nextPing(1000);
if (nextPing) {
Wire.requestFrom(I2C_SLAVE, 6); // request 6 bytes from slave device #8
while (Wire.available()) { // slave may send less than requested
char c = Wire.read(); // receive a byte as character
Serial.print(c); // print the character
}
}
}