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9a2ed274f3
* 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
38 lines
1.0 KiB
C++
38 lines
1.0 KiB
C++
// Wire Master Reader
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// by devyte
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// based on the example of the same name by Nicholas Zambetti <http://www.zambetti.com>
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// Demonstrates use of the Wire library
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// Reads data from an I2C/TWI slave device
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// Refer to the "Wire Slave Sender" example for use with this
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// This example code is in the public domain.
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#include <Wire.h>
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#include <PolledTimeout.h>
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#define SDA_PIN 4
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#define SCL_PIN 5
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const int16_t I2C_MASTER = 0x42;
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const int16_t I2C_SLAVE = 0x08;
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void setup() {
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Serial.begin(115200); // start serial for output
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Wire.begin(SDA_PIN, SCL_PIN, I2C_MASTER); // join i2c bus (address optional for master)
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}
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void loop() {
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using periodic = esp8266::polledTimeout::periodicMs;
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static periodic nextPing(1000);
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if (nextPing) {
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Wire.requestFrom(I2C_SLAVE, 6); // request 6 bytes from slave device #8
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while (Wire.available()) { // slave may send less than requested
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char c = Wire.read(); // receive a byte as character
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Serial.print(c); // print the character
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}
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}
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}
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