Raspberry Pi send data more than 1 byte (e.g. integer 1920) to Arduino by USB cable (serial) - interface

Question

Currently, my project is to get a x coordination , cX value, from a webcam connected to raspberry pi 3B+, and send it to Arduino Uno. I successfully do the action when the integer is in range 0 to 255. Can I modify my code and send a larger integer, say up to 1920 to Arduino?
Here is part of my python code on raspi side:
import serial
import struct
while True:
...
cX = 248 //I want to send a larger number
print (cX)
ser.write(struct.pack('>H', cX))
...
Here is part of my c code on Arduino:
int cX = 0;
void setup()
{
...
Serial.begin(9600);
...
}
void loop()
{
if (Serial.available())
{
cX = Serial.read();
if (cX == 248)
{
//do something
}
}
}
Any help would be greatly appreciated

Answer 1

Try this on the Arduino side:
unsigned int cX = 0;
byte buffer[2] = {0};
size_t len = 0;
void setup()
{
Serial.begin(9600);
}
void loop()
{
if (Serial.available())
{
len = Serial.readBytes(buffer, 2);
if (len == 2)
{
cX = (((int)buffer[0]) << 8) | buffer[1];
if (cX == 1920)
{
//do something
}
}
}
}
On the Python side, I don't know in detail, but from what I could see on the documentation, with the argument >H you should be sending an unsigned short (2 bytes size), big-endian, so it should work.