问题描述
我正在用 python 开发一个硬件程序，我必须在其中创建一个十六进制值的框架，并在 raspberry pi 上串行写入它，以便它可以与终端设备进行通信。
当我手动将计算值输入到框架中时，我得到了想要的结果，但现在我必须自动化这些东西。为此，我正在做以下流程。
1.创建框架。 -- current_frame = [0x0a,0x01,0x10,0x00,0x0a]
2.接受用户的输入。 -- current = float(input('Enter Current Value: '))
3.将浮点输入转换为十六进制值
def float_to_hex(f):
hex_val = binascii.hexlify(struct.pack('>f',f))
return hex_val
4.因为我想将获得的值分成两组，所以我使用了
hex_split = []
for i in range(0,len(hex_value),2):
hex_split.append(hex_value[i:i+2])
5.拆分后，我必须将结果插入主框架，以便我可以计算整个字符串的校验和
for i in range(len(hex_split)):
current_frame.insert(i + 5,hex_split[i])
print ('New Frame',current_frame)
6.我已经使用
计算了校验和def HexToByte(hexStr):
bytes = []
hexStr = ''.join(hexStr.split(" "))
for i in range(0,len(hexStr),2):
bytes.append(int(hexStr[i:i+2],16))
return bytes
7.最后我必须将数据写入串行
但是我没有得到我预期的结果。 请帮忙
尝试 1
import struct
import binascii
# Set Current Frame
current_frame = [0x0a,0x0a]
print ('Original Frame: ',current_frame)
print (type(current_frame[0]))
# Take input from User
current = float(input('Enter Current Value: '))
# Function to Calculate Hex value from Float
def float_to_hex(f):
hex_val = binascii.hexlify(struct.pack('>f',f))
return hex_val
# Use function to get hex value
hex_value = float_to_hex(current).decode()
print ('Hex value of Current is: ',hex_value)
# Split the values into group of 2
hex_split = []
for i in range(0,2):
hex_split.append(hex_value[i:i+2])
print ('Hex value after Split :',hex_split)
print (type(hex_split[0]))
for i in range (0,len(hex_split)):
hex_split[i] = int(hex_split[i],16)
hex_split[i] = hex(hex_split[i])
print (hex_split)
for i in range(len(hex_split)):
current_frame.insert(i + 5,current_frame)
输出
>>> %Run range_test.py
Enter Value of Current: 0.3
3e99999a
['3e','99','9a']
['0a','01','10','00','0a','3e','9a']
[10,1,16,10,62,153,154]
0x22f
2e
0a0110000a3e99999a2e
0x0a 0x01 0x10 0x00 0x0a 0x3e 0x99 0x99 0x9a 0x2e
<class 'str'>
尝试 2
import struct
import binascii
set_current = [ '0a','0a' ]
pos = 5
import serial
import time
ser = serial.Serial(
port='/dev/ttyUSB0',baudrate = 125000,parity=serial.PARITY_NONE,stopbits=serial.STOPBITS_ONE,bytesize=serial.EIGHTBITS,timeout = None
)
# Calculate Hex Value for Current
def float_to_hex(f):
hex_val = binascii.hexlify(struct.pack('>f',f))
return hex_val
# Function Calculate Checksum
def HexToByte(hexStr):
bytes = []
hexStr = ''.join(hexStr.split(" "))
for i in range(0,16))
return bytes
current_value = float(input("Enter Value of Current: "))
data = float_to_hex(current_value).decode()
print (data)
# Create List of Hex element
new_data = []
for i in range(0,len(data),2):
new_data.append((data[i:i+2]))
print (new_data)
# Insert hex list into main list
for i in range (len(new_data)):
set_current.insert(i + 5,new_data[i])
print (set_current)
#
# Join List
set_current = ''.join(map(str,set_current))
# Calculate Checksum
checksum = HexToByte(set_current)
print (checksum)
y = 0
for i in checksum:
y = y + i
print (hex(y))
new_sum = hex(y-1)[3:]
print (new_sum)
set_current = set_current + (new_sum)
print (set_current)
x = []
for i in range(0,len(set_current),2):
x.append((set_current[i:i+2]))
new_x = ' '.join(map(lambda a: ' 0x'+ str(a),x))
print ((new_x))
print (type(new_x))
ser.write(str.encode(new_x))
data_read = ser.read(3)
print ("set_max_current",data_read)
输出
>>> %Run demo1.py
Original Frame: [10,10]
<class 'int'>
Enter Current Value: 0.3
Hex value of Current is: 3e99999a
Hex value after Split : ['3e','9a']
<class 'str'>
['0x3e','0x99','0x9a']
New Frame [10,'0x3e','0x9a']
想要的答案应该是这样的
set_max_current = ([0x0a,0x0a,0x3f,0x80,0xAD])
print (set_max_current)
ser.write(serial.to_bytes(set_max_current))
data_read = ser.read(3)
print ("set_max_current",data_read)
输出
>>> %Run c.py
[10,63,128,173]
set_max_current b'\x03\x00\x02'
解决方法
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