forked from Elron_dev/elbear_arduino_bsp
92 lines
2.2 KiB
C++
92 lines
2.2 KiB
C++
// I2C master
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#include <Wire.h>
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// Slave address
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uint8_t SLAVE_ADDRESS = 0x33;
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// Buffers for sending and receiving
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uint8_t masterTxData[3] = {0x30, 0x41, 0x51};
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uint8_t masterRxData[4] = {0};
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// Function for sending data via I2C bus
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uint8_t masterSendData(uint8_t* data, uint8_t dataLen)
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{
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// Initiating work with the bus
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Wire.beginTransmission(SLAVE_ADDRESS);
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// Send data
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Wire.write(data, dataLen);
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// Finish working with the bus and return the result
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return Wire.endTransmission();
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}
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// Function to receive a specified number of bytes from the I2C bus
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uint8_t masterGetData(uint8_t *buf, uint8_t dataSize)
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{
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// Request data
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Wire.requestFrom(SLAVE_ADDRESS, dataSize);
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// If there are bytes available for reading, read them in a loop
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uint8_t n = 0;
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while (Wire.available())
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{
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// reading from the bus - from the slave device
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buf[n] = Wire.read();
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// Increasing the number of received bytes
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n++;
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}
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// Return the number of received bytes
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return n;
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}
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// -------------------------------------------- //
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void setup()
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{
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Serial.begin(57600);
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while (!Serial);
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Serial.println("I2C master start");
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// Initialize the device on the I2C bus as a master
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Wire.begin();
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}
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void loop()
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{
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// Send data to slave
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Serial.println("------------------------");
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Serial.println("Master | Sending 3 bytes");
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uint8_t result = masterSendData(masterTxData, sizeof(masterTxData));
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// Show result
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if (result == 0)
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Serial.println("Master | Bytes sended");
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else
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{
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Serial.print("Master | Send ERROR! Code: ");
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Serial.println(result);
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}
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// Change the first byte for variety
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masterTxData[0] += 1;
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// Delay before requesting data
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delay(2000);
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// Request data from the slave
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Serial.println("------------------------");
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Serial.println("Master | Receiving 4 bytes");
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uint8_t bytesQty = masterGetData(masterRxData, sizeof(masterRxData));
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// Show result
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if (bytesQty == 0)
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Serial.println("Master | Receive ERROR!");
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else
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{
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for (uint8_t i = 0; i < bytesQty; i++)
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{
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Serial.print("Master | Received byte: 0x");
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Serial.println(masterRxData[i], HEX);
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}
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}
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// Delay before sending data
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delay(2000);
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}
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