I am working with the UART protocol to read data from the distance sensor. The data byte consists of data bits, even parity and a stop bit.
I am trying to send header (ascii value of "INIT") and i try to read it using logic analyzer and serial terminal but the values are not correct.
the output on Realterm serial capture:
Here is the code
#include <Arduino.h>
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#define RX_PIN 0 // GPIO13
#define TX_PIN 1 // GPIO14
double binaryToDouble(uint64_t binaryValue)
{
// Copy the binary value into a double variable
double doubleValue;
memcpy(&doubleValue, &binaryValue, sizeof(double));
return doubleValue;
}
void sendData(const char *alphabet, uint32_t payloadSize, const uint8_t *payloadData)
{
// Send the alphabet
Serial.write((const uint8_t *)alphabet, strlen(alphabet));
// Serial.print("Received Alphabet: ");
// Serial.println(alphabet);
// Serial.println("before size ");
// Send the payload size
Serial.write((const uint8_t *)&payloadSize, sizeof(uint32_t));
// Serial.println("After size ");
// Send the payload data
Serial.write(payloadData, payloadSize);
}
uint64_t receiveMessage()
{
char alphabet[5];
uint32_t receivedPayloadSize;
// Read the alphabet
Serial.readBytes(alphabet, 4);
alphabet[4] = '\0'; // Null-terminate the string
// Read the payload size
Serial.readBytes((char *)&receivedPayloadSize, sizeof(uint32_t));
uint32_t payloadSize = receivedPayloadSize; // Convert back to host byte order
// Read the payload data
uint8_t payload[payloadSize];
// uint64_t payloaddata;
Serial.readBytes(payload, payloadSize);
// Process the received message
Serial.print("Received Alphabet: ");
Serial.println(alphabet);
Serial.print("Received Payload Size: ");
Serial.println(payloadSize);
Serial.print("Received Payload Data: ");
for (uint32_t i = 0; i < payloadSize; i++)
{
Serial.print(payload[i], HEX);
Serial.print(" ");
}
Serial.println();
uint64_t payloaddata = 0;
for (uint32_t i = 0; i < payloadSize; i++)
{
payloaddata <<= 8 * i;
payloaddata |= payload[i]; // OR with the new byte
}
return payloaddata;
}
void setup()
{
//Serial.begin(115200);
Serial.begin(9600, SERIAL_8E1);
uint8_t payload[] = {0x01};
uint32_t payloadSize = sizeof(payload);
uint64_t receivedata;
char alphabet[] = "INIT";
sendData(alphabet, payloadSize, payload);
delay(5000);
while (!Serial.available())
{
Serial.println("Waiting for data: ");
}
// Read and process the acknowledgment message
receiveMessage();
// Wait for data message
while (!Serial.available())
{
Serial.println("Waiting for data: ");
}
// Read and process the data message
receiveMessage();
}
void loop()
{
uint8_t payload[] = {0x01, 0x00, 0x00, 0x00};
uint32_t payloadSize = sizeof(payload);
uint64_t receivedata;
float result;
sendData("GNFD", payloadSize, payload);
while (!Serial.available())
{
Serial.println("Waiting for data: ");
}
// Read and process the acknowledgment message
receiveMessage();
// Wait for data message
while (!Serial.available())
{
Serial.println("Waiting for data: ");
}
// Read and process the data message
receivedata = receiveMessage();
result = binaryToDouble(receivedata);
// Print the result
Serial.print("Binary: ");
// Serial.println(receivedata, BIN);
Serial.print("Distance: ");
Serial.println(result, 4);
// Other loop code
}
