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LED
開關板子上的綠燈，0 關 1 開
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# echo 0 > /sys/class/leds/status_led/brightness |
/sys/class/leds/status_led/nanopi:green:pwr 就是旁邊的紅燈，雖然目錄名稱是 green ...
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UART
- 【Adruino入門】 08.關於GPIO、UART、I2C、SPI
- Python 研究 - pyserial 用法
- https://pyserial.readthedocs.io/en/latest/pyserial_api.html
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# pip install pyserial |
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import serial import gpio gpio.setup(6, 'out') # TR Pin pySerial = serial.Serial("/dev/ttyS1", baudrate=9600, timeout=None, bytesize=8, parity='N', stopbits=1, xonxoff=0, rtscts=0, dsrdtr=0) # def init_gpio(): # gpio.log.setLevel(logging.WARNING) def get_modbus_crc(int_array): value = 0xFFFF for i in range(len(int_array)): value ^= int_array[i] for j in range(8): if (value & 0x01) == 1: value = (value >> 1) ^ 0xA001 else: value >>= 1 return [value & 0xff, (value >> 8) & 0xff] # , port="/dev/ttyS1", baudrate=9600, timeout=10, write_timeout=10 def write_modbus(command_list): full_command_list = command_list + get_modbus_crc(command_list) read_count = full_command_list[5] * 2 + 5 if full_command_list[1] == 3 else len(full_command_list) gpio.set(6, 1) pySerial.write(full_command_list) pySerial.flush() gpio.set(6, 0) read_data = pySerial.read(read_count) data_list = list(read_data) # pySerial.cancel_read() # pySerial.cancel_write() # pySerial.close() return data_list # port = serial.Serial("/dev/ttyS1", baudrate=9600, timeout=1, bytesize=8, parity='N', stopbits=1, xonxoff=0,rtscts=0,dsrdtr=0) while True: # cmd = '3,5,0,1,0,0,157,232'.encode() # port.write('3,5,0,1,255,0,220,24'.encode()) # 開 # cmd = [3,5,0,1,0,0,157,232] # command_list = [3,5,0,1,0,0] command_list = [1,3,0,0,0,2] print(format(command_list)) data_list = write_modbus(command_list) print(format(data_list)) # command_list = [3,5,0,1,255,0] # print(format(command_list)) # data_list = write_modbus(command_list) # print(format(data_list)) |
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