pyA20Lime2 0.2.1

GPIO方法

init() - Make initialization of the module. Always must be called first. getcfg() - Read current configuration of gpio. setcfg() - Write configuration to gpio. input() - Return current value of gpio. output() - Set output value. pullup() - Set pull-up/pull-down.

可用常数为：

NAME - EQUALS TO ==== ========= HIGH -> 1 LOW -> 0 INPUT -> 0 OUPTUT -> 1 PULLUP -> 1 PULLDOWN -> 2

GPIO有两种命名方式：

By port name: PH0, PG2, PE10, etc. These can be imported from port module:

>>> from pyA20Lime2.gpio import port
>>> dir(port)

By connector name and pin number: gpio2p12, gpio3p8, etc. These can be imported from connector module:

>>> from pyA20Lime2.gpio import connector
>>> dir(connector)

通常，这些常量只是内存中与基本GPIO地址的偏移量，因此它们可以 分配给数字类型变量。

>>> led = port.PH2
>>> print led
226

I2C方法

init() - Make initialization of the module open() - Begin communication with slave device read() - Read from slave device write() - Write data to slave device close() - End communication with slave device

SPI方法

open() - Open SPI bus with given configuration read() - Read data from slave device without write write() - Write data to slave device without read xfer() - Do write and after that read close() - Close SPI bus

示例

GPIO:

#!/usr/bin/env python

from pyA20Lime2.gpio import gpio
from pyA20Lime2.gpio import port
from pyA20Lime2.gpio import connector

gpio.init() #Initialize module. Always called first

gpio.setcfg(port.PG9, gpio.OUTPUT)  #Configure LED1 as output
gpio.setcfg(port.PG9, 1)    #This is the same as above

gpio.setcfg(port.PE11, gpio.INPUT)   #Configure PE11 as input
gpio.setcfg(port.PE11, 0)   #Same as above

gpio.pullup(port.PE11, 0)   #Clear pullups
gpio.pullup(port.PE11, gpio.PULLDOWN)    #Enable pull-down
gpio.pullup(port.PE11, gpio.PULLUP)  #Enable pull-up

while True:
    if gpio.input(port.PE11) == 1:
        gpio.output(port.PG9, gpio.LOW)
        gpio.output(port.PG9, 0)
    else:
        gpio.output(port.PG9, gpio.HIGH)
        gpio.output(port.PG9, 1)

I2C:

#!/usr/bin/env python

from pyA20Lime2 import i2c

i2c.init("/dev/i2c-2")  #Initialize module to use /dev/i2c-2
i2c.open(0x55)  #The slave device address is 0x55

#If we want to write to some register
i2c.write([0xAA, 0x20]) #Write 0x20 to register 0xAA
i2c.write([0xAA, 0x10, 0x11, 0x12]) #Do continuous write with start address 0xAA

#If we want to do write and read
i2c.write([0xAA])   #Set address at 0xAA register
value = i2c.read(1) #Read 1 byte with start address 0xAA

i2c.close() #End communication with slave device

SPI:

#!/usr/bin/env python

from pyA20Lime2 import spi

spi.open("/dev/spidev2.0")
#Open SPI device with default settings
# mode : 0
# speed : 100000kHz
# delay : 0
# bits-per-word: 8

#Different ways to open device
spi.open("/dev/spidev2.0", mode=1)
spi.open("/dev/spidev2.0", mode=2, delay=0)
spi.open("/dev/spidev2.0", mode=3, delay=0, bits_per_word=8)
spi.open("/dev/spidev2.0", mode=0, delay=0, bits_per_word=8, speed=100000)

spi.write([0x01, 0x02]) #Write 2 bytes to slave device
spi.read(2) #Read 2 bytes from slave device
spi.xfer([0x01, 0x02], 2)   #Write 2 byte and then read 2 bytes.

spi.close() #Close SPI bus

以根用户身份运行python脚本很重要！

更改日志

• pyAA20Lime2 0.2.1 (30 JUN 2015)

  • Fixed issue with SPI xfer function

• pyA20Lime2 0.2.0 (3 SEP 2014)

  • Initial release