[英]Sending integer values to Arduino from PySerial
我需要發送大於255的整數嗎? 有誰知道如何做到這一點?
這是這樣的(謝謝你的想法,亞歷克斯!):
蟒蛇:
def packIntegerAsULong(value):
"""Packs a python 4 byte unsigned integer to an arduino unsigned long"""
return struct.pack('I', value) #should check bounds
# To see what it looks like on python side
val = 15000
print binascii.hexlify(port.packIntegerAsULong(val))
# send and receive via pyserial
ser = serial.Serial(serialport, bps, timeout=1)
ser.write(packIntegerAsULong(val))
line = ser.readLine()
print line
的Arduino:
unsigned long readULongFromBytes() {
union u_tag {
byte b[4];
unsigned long ulval;
} u;
u.b[0] = Serial.read();
u.b[1] = Serial.read();
u.b[2] = Serial.read();
u.b[3] = Serial.read();
return u.ulval;
}
unsigned long val = readULongFromBytes();
Serial.print(val, DEC); // send to python to check
使用Python的struct
模塊將它們編碼為二進制字符串。 我不知道arduino是否希望它們為小端或大端,但是,如果其文檔尚不清楚,只需進行一些實驗即可輕松解決問題;-)。
更簡單的方法:
crc_out = binascii.crc32(data_out) & 0xffffffff # create unsigned long
print "crc bytes written",arduino.write(struct.pack('<L', crc_out)) #L, I whatever u like to use just use 4 bytes value
unsigned long crc_python = 0;
for(uint8_t i=0;i<4;i++){
crc_python |= ((long) Serial.read() << (i*8));
}
無需工會,時間短!
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