0a45a06142
This PR enhances the Wire library to support std::function–based callbacks for I2C slave mode, enabling the use of lambdas and captured contexts. - Replaces raw function pointers in TwoWire and HardwareI2C with std::function for onRequest and onReceive - Updates constructors, method signatures, and default initializations to use std::function - Adds new example sketch, CI config, and documentation updates demonstrating the functional callback API
37 lines
801 B
C++
37 lines
801 B
C++
// This example demonstrates the use of functional callbacks with the Wire library
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// for I2C slave communication. It shows how to handle requests and data reception
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#include "Wire.h"
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#define I2C_DEV_ADDR 0x55
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uint32_t i = 0;
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void setup() {
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Serial.begin(115200);
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Serial.setDebugOutput(true);
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Wire.onRequest([]() {
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Wire.print(i++);
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Wire.print(" Packets.");
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Serial.println("onRequest");
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});
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Wire.onReceive([](int len) {
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Serial.printf("onReceive[%d]: ", len);
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while (Wire.available()) {
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Serial.write(Wire.read());
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}
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Serial.println();
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});
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Wire.begin((uint8_t)I2C_DEV_ADDR);
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#if CONFIG_IDF_TARGET_ESP32
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char message[64];
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snprintf(message, 64, "%lu Packets.", i++);
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Wire.slaveWrite((uint8_t *)message, strlen(message));
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#endif
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}
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void loop() {}
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