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我正在尝试与Arduino进行通信。我使用python和pyserial通过USB进行通信。正如你在下面的源代码中看到的那样，我试图向Arduino发送一个包含两个ledstrips的一些信息的bytearray。但是Arduino没有收到正确的信息。它看起来像bytearray被转换或信息正在丢失。通过USB从Python到Arduino的通信
我搜索了整整一天的解决方案，但没有任何工作。希望你们中的一个能帮助我解决这个问题。
在此先感谢。
Python代码
import sys
import serial
import time
HEADER_BYTE_1 = 0xBA
HEADER_BYTE_2 = 0xBE
def main():
ser = serial.Serial('/dev/ttyUSB0', 57600)
message = { 'header': [None]*2, 'colors': [None]*6, 'checksum': 0x00 }
message['header'][0] = HEADER_BYTE_1
message['header'][1] = HEADER_BYTE_2
# first led
message['colors'][0] = 0xFF
message['colors'][1] = 0xFF
message['colors'][2] = 0xFF
# second led
message['colors'][3] = 0x00
message['colors'][4] = 0x00
message['colors'][5] = 0x00
# create checksum
for color in message['colors']:
for bit in bytes(color):
message['checksum'] ^= bit
# write message to arduino
cmd = convert_message_to_protocol(message)
ser.write(cmd)
print(cmd)
time.sleep(5)
# read response from arduino
while True:
response = ser.readline()
print(response)
def convert_message_to_protocol(message):
cmd = bytearray()
for header in message['header']:
cmd.append(header)
for color in message['colors']:
cmd.append(color)
cmd.append(message['checksum'])
return cmd
if __name__ == '__main__':
main()
Arduino的代码
const int kChannel1FirstPin = 3;
const int kChannel1SecondPin = 5;
const int kChannel1ThirdPin = 6;
const int kChannel2FirstPin = 9;
const int kChannel2SecondPin = 10;
const int kChannel2ThirdPin = 11;
// Protocol details (two header bytes, 6 value bytes, checksum)
const int kProtocolHeaderFirstByte = 0xBA;
const int kProtocolHeaderSecondByte = 0xBE;
const int kProtocolHeaderLength = 2;
const int kProtocolBodyLength = 6;
const int kProtocolChecksumLength = 1;
// Buffers and state
bool appearToHaveValidMessage;
byte receivedMessage[6];
void setup() {
// set pins 2 through 13 as outputs:
pinMode(kChannel1FirstPin, OUTPUT);
pinMode(kChannel1SecondPin, OUTPUT);
pinMode(kChannel1ThirdPin, OUTPUT);
pinMode(kChannel2FirstPin, OUTPUT);
pinMode(kChannel2SecondPin, OUTPUT);
pinMode(kChannel2ThirdPin, OUTPUT);
analogWrite(kChannel1FirstPin, 255);
analogWrite(kChannel1SecondPin, 255);
analogWrite(kChannel1ThirdPin, 255);
analogWrite(kChannel2FirstPin, 255);
analogWrite(kChannel2SecondPin, 255);
analogWrite(kChannel2ThirdPin, 255);
appearToHaveValidMessage = false;
// initialize the serial communication:
Serial.begin(57600);
}
void loop() {
int availableBytes = Serial.available();
Serial.println(availableBytes);
if (!appearToHaveValidMessage) {
// If we haven't found a header yet, look for one.
if (availableBytes >= kProtocolHeaderLength) {
Serial.println("right size");
// Read then peek in case we're only one byte away from the header.
byte firstByte = Serial.read();
byte secondByte = Serial.peek();
if (firstByte == kProtocolHeaderFirstByte &&
secondByte == kProtocolHeaderSecondByte) {
Serial.println("Right Header");
// We have a valid header. We might have a valid message!
appearToHaveValidMessage = true;
// Read the second header byte out of the buffer and refresh the buffer count.
Serial.read();
availableBytes = Serial.available();
}
}
}
if (availableBytes >= (kProtocolBodyLength + kProtocolChecksumLength) && appearToHaveValidMessage) {
// Read in the body, calculating the checksum as we go.
byte calculatedChecksum = 0;
for (int i = 0; i < kProtocolBodyLength; i++) {
receivedMessage[i] = Serial.read();
calculatedChecksum ^= receivedMessage[i];
}
byte receivedChecksum = Serial.read();
if (receivedChecksum == calculatedChecksum) {
// Hooray! Push the values to the output pins.
analogWrite(kChannel1FirstPin, receivedMessage[0]);
analogWrite(kChannel1SecondPin, receivedMessage[1]);
analogWrite(kChannel1ThirdPin, receivedMessage[2]);
analogWrite(kChannel2FirstPin, receivedMessage[3]);
analogWrite(kChannel2SecondPin, receivedMessage[4]);
analogWrite(kChannel2ThirdPin, receivedMessage[5]);
Serial.print("OK");
Serial.write(byte(10));
} else {
Serial.print("FAIL");
Serial.write(byte(10));
}
appearToHaveValidMessage = false;
}
}
例
生成字节在Python：b'\xba\xbe\xff\xff\xff\x00\x00\x00\x00'
上收到Arduino的字节：b'L\xc30\r\n'