Raspberry pi using gpio simulate spi write

raspi_gpio_spi_write.py

from __future__ import print_function
from raspi_io import GPIO
__all__ = ['GPIOSPI']


class GPIOSPI(object):
    """
    SPI Frame | reg, reg | data 0 - 7|
    """
    # Frame 10 bits
    FRAME_MASK = 0x3ff
    BIT_PER_FRAME = 10
    BIT_SHIFT_MASK = 1 << BIT_PER_FRAME

    def __init__(self, address, clk, dat, stb, debug=True):
        """GPIO simulate spi

        :param address: raspi address
        :param clk: spi sclk
        :param dat: spi mosi
        :param stb: spi cs
        :param debug: debug option
        """
        self.__clk = clk
        self.__dat = dat
        self.__stb = stb
        self.__debug = debug
        self.__gpio = GPIO(address)
        self.__gpio.setmode(GPIO.BCM)
        self.__gpio.setup([clk, dat, stb], GPIO.OUT, initial=False)

    def write_frame(self, data):
        """Write basic frame

        :param data: frame data
        :return:
        """
        data &= self.FRAME_MASK
        self.__gpio.output([self.__clk, self.__dat, self.__stb], 0)

        if self.__debug:
            print("Frame: 0x{0:03X},".format(data), end=' ')

        for i in range(self.BIT_PER_FRAME):
            self.__gpio.output(self.__clk, 0)

            if self.__debug:
                print(1 if data & 0x200 else 0, end=' ')

            self.__gpio.output(self.__dat, 1 if data & self.BIT_SHIFT_MASK else 0)
            if i == self.BIT_PER_FRAME - 1:
                self.__gpio.output(self.__stb, 1)

            self.__gpio.output(self.__clk, 1)
            data = (data << 1) & self.FRAME_MASK


if __name__ == "__main__":
    spi = GPIOSPI(('192.168.1.166', 9876), 11, 10, 7)
    spi.write_frame(0x3ff)