import kv
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from driver import UART
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import _thread
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import tool
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import app_aliyunIot
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import utime # 延时函数在utime库中
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uart = UART()
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#打开串口通讯
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def uart_init():
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uart.open("serial3")
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print('open -----------serial3')
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utime.sleep_ms(1000)
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_thread.start_new_thread(uart_read, ())
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#发送K到串口 读取返回数据
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def uart_read():
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print('开启串口读取')
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while True:
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# 定义16进制数据列表 电量%分比
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hex_dataSos = [0x01, 0x04, 0x00,0X00,0X00,0X01,0X31,0XCA]
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# 报警的命令
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hex_dataAlert = [0x01,0x04,0x00,0x02,0x00,0x01,0x90,0x0A]
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# 发送电压的命令
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hex_dataV = [0x01, 0x04, 0x00,0X01,0X00,0X01,0X60,0X0A]
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sundSos(hex_dataSos,'sos')
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sundSos(hex_dataAlert,'alert')
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sundSos(hex_dataV,'dianya')
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utime.sleep_ms(10000)
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def crc16(data, poly=0xA001, init_crc=0xFFFF):
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crc = init_crc
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for byte in data:
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crc ^= byte
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for _ in range(8):
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if crc & 0x0001:
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crc = (crc >> 1) ^ poly
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else:
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crc >>= 1
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return crc
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#发送指令到串口
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def sundSos(hex_data,type):
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# 将16进制数据列表转换为字节串
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byte_data = bytes(hex_data)
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uart.write(byte_data)
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#发送3秒后就读数据
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utime.sleep_ms(1000)
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readBuf = bytearray(570)
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recvSize = uart.read(readBuf)
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rData= bytearray(5)
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for num in range(0,5): # 迭代 10 到 20 之间的数字
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rData[num]=readBuf[num]
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print("接收到数据:")
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print(rData)
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# 计算 CRC
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calculated_crc = crc16(rData)
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# 提取低位和高位字节
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crc_low_byte = calculated_crc & 0xFF
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crc_high_byte = (calculated_crc >> 8) & 0xFF
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# 输出计算得到的 CRC
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print("输出计算得到的 CRC: {} {}".format(crc_low_byte, crc_high_byte))
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# 检查与给定的 CRC 校验码是否匹配
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expected_crc_low_byte = readBuf[5]
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expected_crc_high_byte = readBuf[6]
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if crc_low_byte == expected_crc_low_byte and crc_high_byte == expected_crc_high_byte:
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print("CRC 校验正确")
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if type=='sos':
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print("输出计算得到的电量: {}".format(readBuf[4]))
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app_aliyunIot.sudDataPostProps({"Dsos":readBuf[4]})
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elif type=='alert':
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print("输出计算得到的电池报警: {}".format(readBuf[4]))
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app_aliyunIot.sudDataPostProps({"Dalert":readBuf[4]})
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elif type=='dianya':
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print(readBuf[3],readBuf[4])
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dianyasun=hex_to_decimal_divide(readBuf[3],readBuf[4])
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print("输出计算得到的电压: {}".format(dianyasun))
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app_aliyunIot.sudDataPostProps({"Dv":dianyasun})
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else:
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print("CRC 校验不正确")
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def hex_to_decimal_divide(dec1, dec2):
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hex1 = '{:02X}'.format(dec1)
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hex2 = '{:02X}'.format(dec2)
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# 将十六进制字符串转换为整数
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decimal_value = int(hex1 + hex2, 16)
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# 除以 100 并保留一位小数
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result = round(decimal_value / 100, 1)
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return result
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