Controlling the Gateway

The below assumes you have sucessfully connected to your gateway:

from lager import lager

gateway = lager.Lager()

GPIO Example

import time

# Blink an LED connected to GPIO 0
gateway.gpio.write(0, HIGH)
time.sleep(0.5)
gateway.gpio.write(0, LOW);
time.sleep(0.5)

SPI Example

SPI Modes:

Mode	POL	PHA
0	0	0
1	0	1
2	1	0
3	1	1

# Start an SPI connection
# mode = 0
# speed = 50,000 bits per second
gateway.spi.connect(0, 50000)

# Write a single 0x00 byte
gateway.spi.write(b'\x00')

# Write multiple bytes
bytes = b'\xc0\x01'
gateway.spi.write(bytes)

# Read 10 bytes from SPI
count, rx_bytes = gateway.spi.read(10)
print(f"Received {count} bytes: {rx_bytes}")

# Transfer bytes
count, rx_bytes = gateway.spi.xfer(b'\xc0\x01')
print(f"Received {count} bytes: {rx_bytes}")

I2C Example

# Open an I2C connection to device address 0x53
gateway.i2c.connect(0x53)

# Read a single byte from device
byte = gateway.i2c.read_byte()

# Read a single byte from register 3
byte = gateway.i2c.read_byte_data(3)

# Read 10 bytes from the raw device
count, rx_bytes = gateway.i2c.read_device(10)

# Read 8 bytes from register 3
# Note: count may be between 1 and 32
count, rx_bytes = gateway.i2c.read_i2c_block_data(3, 8)

# Read a single 16 bit word from register 3
rx_word = gateway.i2c.read_word_data(3)

# Write up to 32 bytes to register 3
gateway.i2c.write_block_data(3, b'\x00\x01\x02')

# Write a single byte to the device
gateway.i2c.write_byte(0x23)

# Write a single byte to register 3
gateway.i2c.write_byte_data(3, 0x23)

# Write data to the raw device
gateway.i2c.write_device(b'\x00\x01\x02')

# Write up to 32 byets to register 3
gateway.i2c.write_i2c_block_data(3, b'\x00\x01\x02')

# Write a single bit to the device
gateway.i2c.write_quick(1)

# Write a single 16 bit word to register 3
gateway.i2c.write_word_data(3, 0xc001)

Serial/UART Example

Serial access is provided by the pyserial module:

import serial
with serial.Serial('/dev/ttyS0', 9600, timeout=1) as ser:
    x = ser.read() # Read one byte
    s = ser.read(10) # Read up to 10 bytes (timeout)
    ser.write(b'hello') # Write a string