--<\/p>\n
\u958b\u95dc\u677f\u5b50\u4e0a\u7684\u7da0\u71c8\uff0c0 \u95dc 1 \u958b<\/p>\n
# echo 0 > \/sys\/class\/leds\/status_led\/brightness<\/pre>\n\/sys\/class\/leds\/status_led\/nanopi:green:pwr \u5c31\u662f\u65c1\u908a\u7684\u7d05\u71c8\uff0c\u96d6\u7136\u76ee\u9304\u540d\u7a31\u662f green ...<\/p>\n
--<\/p>\n
UART<\/h2>\n
\n
- \u3010Adruino\u5165\u9580\u3011 08.\u95dc\u65bcGPIO\u3001UART\u3001I2C\u3001SPI<\/a><\/li>\n
- Python \u7814\u7a76 - pyserial \u7528\u6cd5<\/a><\/li>\n
- https:\/\/pyserial.readthedocs.io\/en\/latest\/pyserial_api.html<\/li>\n<\/ul>\n
# pip install pyserial<\/pre>\n<\/p>\n
import serial\r\nimport gpio\r\n\r\ngpio.setup(6, 'out') # TR Pin\r\npySerial = serial.Serial(\"\/dev\/ttyS1\", baudrate=9600, timeout=None, bytesize=8, parity='N', stopbits=1, xonxoff=0, rtscts=0, dsrdtr=0)\r\n\r\n# def init_gpio():\r\n # gpio.log.setLevel(logging.WARNING)\r\n\r\n\r\ndef get_modbus_crc(int_array):\r\n value = 0xFFFF\r\n for i in range(len(int_array)):\r\n value ^= int_array[i]\r\n for j in range(8):\r\n if (value & 0x01) == 1:\r\n value = (value >> 1) ^ 0xA001\r\n else:\r\n value >>= 1\r\n return [value & 0xff, (value >> 8) & 0xff]\r\n\r\n\r\n# , port=\"\/dev\/ttyS1\", baudrate=9600, timeout=10, write_timeout=10\r\ndef write_modbus(command_list):\r\n full_command_list = command_list + get_modbus_crc(command_list)\r\n read_count = full_command_list[5] * 2 + 5 if full_command_list[1] == 3 else len(full_command_list)\r\n gpio.set(6, 1)\r\n pySerial.write(full_command_list)\r\n pySerial.flush()\r\n gpio.set(6, 0)\r\n read_data = pySerial.read(read_count)\r\n data_list = list(read_data)\r\n # pySerial.cancel_read()\r\n # pySerial.cancel_write()\r\n # pySerial.close()\r\n return data_list\r\n\r\n# port = serial.Serial(\"\/dev\/ttyS1\", baudrate=9600, timeout=1, bytesize=8, parity='N', stopbits=1, xonxoff=0,rtscts=0,dsrdtr=0)\r\n\r\nwhile True:\r\n # cmd = '3,5,0,1,0,0,157,232'.encode()\r\n # port.write('3,5,0,1,255,0,220,24'.encode()) # \u958b\r\n\r\n # cmd = [3,5,0,1,0,0,157,232]\r\n # command_list = [3,5,0,1,0,0]\r\n command_list = [1,3,0,0,0,2]\r\n print(format(command_list))\r\n data_list = write_modbus(command_list)\r\n print(format(data_list))\r\n\r\n # command_list = [3,5,0,1,255,0]\r\n # print(format(command_list))\r\n # data_list = write_modbus(command_list)\r\n # print(format(data_list))\r\n<\/pre>\n--<\/p>\n
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