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python-ucdev

Python library to access Cypress CY7C6521x (CY7C65211, CY7C65213, or CY7C65215) USB-Serial bridge (USB to UART/I2C/SPI/GPIO) chip. Also includes library to access various chips over I2C/SPI. Currently includes driver for

  • Nordic nRF24L01 wireless tranceiver (SPI)
  • InvenSense MPU-6050 3-axis accelerometer + 3-axis gyroscope (I2C)
  • Honeywell HMC5883L 3-axis magnetometer (I2C)
  • Si4702 FM radio receiver (I2C for now, additional SPI-mode ongoing)

Usage (CY7C6521x)

>>> from ucdev.cy7c65211 import CyUSBSerial, CyGPIO, CySPI
>>> 
>>> # load DLL provided by Cypress
>>> lib = CyUSBSerial(lib="cyusbserial")
>>>
>>> # use first device found
>>> dev = lib.find().next()
>>>
>>> # access GPIO
>>> gpio = CyGPIO(dev)
>>> gpio.set(3, 1)
>>> ret = gpio.get(3)
>>>
>>> # access each GPIO pin
>>> pin = gpio.pin(3)
>>> pin.set(1)
>>> ret = pin.get()
>>>
>>> # access SPI
>>> spi = CySPI(dev)
>>> ret = spi.send("any-data-to-be-clocked-out")

Usage (nRF24L01)

>>> from ucdev.nrf24 import *
>>> 
>>> tx = nRF24(CySPI(dev), CE=CyGPIO(dev).pin(0))
>>> tx.reset(MODE_SB|DIR_SEND)
>>> tx.TX_ADDR = tx.RX_ADDR_P0 = 0xB3B4B5B6C2
>>> tx.send("some-payload-len-of-max-32-bytes")
>>>
>>> print tx.FIFO_STATUS.TX_EMPTY
>>> print tx.CONFIG

Note

This requires cyusbserial.dll (or libcyusbserial.so) library provided by Cypress.

Current development focuses on GPIO and SPI features to use Nordic nRF24 wireless tranceiver chip. See sample scripts under bin/ folder for the detail.