Python package to transfer data in a fast, reliable, and packetized form.
If using this package to communicate with Arduinos, see https://github.com/PowerBroker2/SerialTransfer for the corresponding and compatible library (also available through the Arduino IDE's Libraries Manager).
pip install pySerialTransfer
import time
from pySerialTransfer import pySerialTransfer as txfer
if __name__ == '__main__':
try:
link = txfer.SerialTransfer('COM17')
link.open()
time.sleep(2) # allow some time for the Arduino to completely reset
while True:
send_size = 0
###################################################################
# Send a list
###################################################################
list_ = [1, 3]
list_size = link.tx_obj(list_)
send_size += list_size
###################################################################
# Send a string
###################################################################
str_ = 'hello'
str_size = link.tx_obj(str_, send_size) - send_size
send_size += str_size
###################################################################
# Send a float
###################################################################
float_ = 5.234
float_size = link.tx_obj(float_, send_size) - send_size
send_size += float_size
###################################################################
# Transmit all the data to send in a single packet
###################################################################
link.send(send_size)
###################################################################
# Wait for a response and report any errors while receiving packets
###################################################################
while not link.available():
# A negative value for status indicates an error
if link.status.value < 0:
if link.status == txfer.Status.CRC_ERROR:
print('ERROR: CRC_ERROR')
elif link.status == txfer.Status.PAYLOAD_ERROR:
print('ERROR: PAYLOAD_ERROR')
elif link.status == txfer.Status.STOP_BYTE_ERROR:
print('ERROR: STOP_BYTE_ERROR')
else:
print('ERROR: {}'.format(link.status.name))
###################################################################
# Parse response list
###################################################################
rec_list_ = link.rx_obj(obj_type=type(list_),
obj_byte_size=list_size,
list_format='i')
###################################################################
# Parse response string
###################################################################
rec_str_ = link.rx_obj(obj_type=type(str_),
obj_byte_size=str_size,
start_pos=list_size)
###################################################################
# Parse response float
###################################################################
rec_float_ = link.rx_obj(obj_type=type(float_),
obj_byte_size=float_size,
start_pos=(list_size + str_size))
###################################################################
# Display the received data
###################################################################
print('SENT: {} {} {}'.format(list_, str_, float_))
print('RCVD: {} {} {}'.format(rec_list_, rec_str_, rec_float_))
print(' ')
except KeyboardInterrupt:
try:
link.close()
except:
pass
except:
import traceback
traceback.print_exc()
try:
link.close()
except:
pass#include "SerialTransfer.h"
SerialTransfer myTransfer;
void setup()
{
Serial.begin(115200);
myTransfer.begin(Serial);
}
void loop()
{
if(myTransfer.available())
{
// send all received data back to Python
for(uint16_t i=0; i < myTransfer.bytesRead; i++)
myTransfer.packet.txBuff[i] = myTransfer.packet.rxBuff[i];
myTransfer.sendData(myTransfer.bytesRead);
}
}Note that you can specify many callbacks, but only one per packet ID
import time
from pySerialTransfer import pySerialTransfer as txfer
def hi():
'''
Callback function that will automatically be called by link.tick() whenever
a packet with ID of 0 is successfully parsed.
'''
print("hi")
'''
list of callback functions to be called during tick. The index of the function
reference within this list must correspond to the packet ID. For instance, if
you want to call the function hi() when you parse a packet with an ID of 0, you
would write the callback list with "hi" being in the 0th place of the list:
'''
callback_list = [ hi ]
if __name__ == '__main__':
try:
link = txfer.SerialTransfer('COM17')
link.set_callbacks(callback_list)
link.open()
time.sleep(2) # allow some time for the Arduino to completely reset
while True:
link.tick()
except KeyboardInterrupt:
link.close()
except:
import traceback
traceback.print_exc()
link.close()
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