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Ghassan Yusuf 2025-06-21 14:29:11 +03:00
parent 9a7677a857
commit 36185974eb
3 changed files with 150 additions and 77 deletions
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154
src/i2c/esp32c3_master_i2c/esp32c3_master_i2c.ino
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#include <Wire.h> #include <Wire.h>
#include <Adafruit_GFX.h> #include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h> #include <Adafruit_SSD1306.h>
#define SCREEN_WIDTH 128 #define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 32 #define SCREEN_HEIGHT 32
#define OLED_RESET -1 // No reset pin #define OLED_RESET -1 // No reset pin
#define OLED_ADDR 0x3C #define OLED_ADDR 0x3C
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET); Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
// NEW Datatype For State // NEW Datatype For State
enum _state { NOT_READY, READY, SENDING }; enum _state { NOT_READY, READY, SENDING };
// Variables // Variables
_state state = NOT_READY; _state state = NOT_READY;
void setup() { void setup() {
// Serial // Serial
Serial.begin(115200); Serial.begin(115200);
// Initialize I2C bus (ESP32-C3 default pins) // Initialize I2C bus (ESP32-C3 default pins)
Wire.begin(); Wire.begin();
// Scan I2C devices // Scan I2C devices
Serial.println("Scanning I2C devices..."); Serial.println("Scanning I2C devices...");
// Scan I2C // Scan I2C
scanI2C(); scanI2C();
// Initialize OLED // Initialize OLED
if(!display.begin(SSD1306_SWITCHCAPVCC, OLED_ADDR)) { if(!display.begin(SSD1306_SWITCHCAPVCC, OLED_ADDR)) {
Serial.println("SSD1306 allocation failed"); Serial.println("SSD1306 allocation failed");
while(1); while(1);
} }
// Print On Display // Print On Display
oled_write("Hello, ESP32-C3!"); oled_write("Hello, ESP32-C3!");
} }
void loop() { void loop() {
// Send Tex Message To Slave // Send Tex Message To Slave
i2c_send_string(0x55, Question("String Message")); i2c_send_string(0x55, Question("String Message"));
// Request Data // Request Data
Wire.requestFrom(0x55, 1); Wire.requestFrom(0x55, 1);
// Read Data Available // Read Data Available
if(Wire.available()) { if(Wire.available()) {
if(char(Wire.read()) == 'N') { if(char(Wire.read()) == 'N') {
Serial.println("Requested Data : Not Ready"); Serial.println("Requested Data : Not Ready");
state = NOT_READY; state = NOT_READY;
} else { } else {
Serial.println("Requested Data : Ready"); Serial.println("Requested Data : Ready");
state = READY; state = READY;
} }
} }
// Request Data // Request Data
Wire.requestFrom(0x55, 6); Wire.requestFrom(0x55, 6);
// Prepare 6 Bytes Of Data // Prepare 6 Bytes Of Data
uint8_t data[6]; uint8_t data[6];
// Read Data Available // Read Data Available
if(Wire.available()) { if(Wire.available()) {
for(int i=0; i<6; i++) { for(int i=0; i<6; i++) {
data[i] = Wire.read(); data[i] = Wire.read();
Serial.print(char(data[i])); Serial.print(char(data[i]));
} }
Serial.println(); Serial.println();
} }
} }

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src/i2c/esp32c3_master_i2c/functions.ino Normal file
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// Question
String Question(String Message) {
Serial.print(Message + " : ");
while(!Serial.available());
Message = Serial.readStringUntil('\n');
while(Serial.available()) Serial.read();
Message.trim();
Serial.println(Message);
return Message;
}
// OLED Display
void oled_write(String message) {
display.clearDisplay();
display.setTextSize(1);
display.setTextColor(SSD1306_WHITE);
display.setCursor(0, 0);
display.println(message);
display.display();
}
// I2C Scanner
void scanI2C() {
byte error, address;
int nDevices = 0;
for(address = 1; address < 127; address++ ) {
Wire.beginTransmission(address);
error = Wire.endTransmission();
if (error == 0) {
Serial.print("I2C device found at address 0x");
if (address<16) Serial.print("0");
Serial.println(address, HEX);
nDevices++;
} else if (error==4) {
Serial.print("Unknown error at address 0x");
if (address<16) Serial.print("0");
Serial.println(address, HEX);
}
}
if (nDevices == 0)
Serial.println("No I2C devices found");
else
Serial.println("Scan complete");
}

22
src/i2c/esp32c3_master_i2c/i2c_functions.ino Normal file
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// This Function If Called Sends A Text Message Via I2C
void i2c_send_string(uint8_t Slave, String message) {
// Sending Data
Wire.beginTransmission(Slave);
// First Data Byte Is Length
Wire.write(message.length());
// Second Send Data One Byte At A Time
for(int i=0; i<message.length(); i++) {
// Send String Bits
Wire.write(message[i]);
}
// Finally Closing Transmission
Wire.endTransmission();
}