def __cal_flow_rate(frame):
"""
获取瞬时流量
:param frame:
:return:
"""
field = data_field.find_flow_rate_field()
if len(frame) <= field.end_address:
return None
flow_rate = math.calculate_double(
frame[field.begin_address:field.end_address + 1])
return flow_rate
def __cal_total_flow(frame):
int_field = data_field.find_total_flow_int_field()
float_field = data_field.find_total_flow_float_field()
res = 0.0
if len(frame) > int_field.end_address:
res += math.byte_arr_convert_int(
frame[int_field.begin_address:int_field.end_address + 1])
if len(frame) > float_field.end_address:
res += math.calculate_double(
frame[float_field.begin_address:float_field.end_address + 1])
return float(res)
def get_field_val(frame, opr_type):
"""
获取域值
:param frame:
:param opr_type:
:return:
"""
# 数据域在数组中开始的索引
__DATA_FIELD_BEGIN_INDEX = 4
# 数据域在数组中结束的索引
__DATA_FIELD_END_INDEX = 6
if opr_type == Operator.RECHARGE:
return math.byte_arr_convert_int(
frame[__DATA_FIELD_BEGIN_INDEX:__DATA_FIELD_END_INDEX])
elif opr_type == Operator.SET_FLOW_RATIO:
return math.calculate_double(
frame[__DATA_FIELD_BEGIN_INDEX:__DATA_FIELD_END_INDEX])
elif opr_type == Operator.SET_METER_ADDRESS:
return math.byte_arr_convert_int(
frame[__DATA_FIELD_BEGIN_INDEX:__DATA_FIELD_END_INDEX])
import struct
from flowmeter.common.api import math
x = [int('01', 16), int('17', 16), int('00', 16), int('00', 16)]
print("%.300lf" % math.calculate_double(x))