SPI Commands

The SPI communication protocol is supported on the standard SPI pin set specified for your MCU.

NOTE: Examples for SPI read and write may be found here:

For telemetrix: spi_mpu9250.py

For telemetrix-aio: spi_mpu9250.py

Read Commands

spi_read_blocking

    def spi_read_blocking(self, register_selection, number_of_bytes_to_read,
                          call_back=None, enable_read_bit=True):
        """
        Read the specified number of bytes from the specified SPI port and
        call the callback function with the reported data.

        :param register_selection: Register to be selected for read.

        :param number_of_bytes_to_read: Number of bytes to read

        :param call_back: Required callback function to report spi data as a
                   result of read command

        :param enable_read_bit: Many SPI devices require that the register
                                selection be OR'ed with 0x80. If set to True
                                the bit will be set.


        callback returns a data list:
        [SPI_READ_REPORT, count of data bytes read, data bytes, time-stamp]

        SPI_READ_REPORT = 13

        """

Write Commands

spi_write_blocking

def spi_write_blocking(self, bytes_to_write):
    """
    Write a list of bytes to the SPI device.

    :param bytes_to_write: A list of bytes to write. This must
                            be in the form of a list.

    """

Control And Operational Commands

spi_cs_control

def spi_cs_control(self, chip_select_pin, select):
    """
    Control an SPI chip select line
    :param chip_select_pin: pin connected to CS

    :param select: 0=select, 1=deselect
    """

spi_set_format

def spi_set_format(self, clock_divisor, bit_order, data_mode):
    """
    Configure how the SPI serializes and de-serializes data on the wire.

    See Arduino SPI reference materials for details.

    :param clock_divisor:

    :param bit_order:

                        LSBFIRST = 0

                        MSBFIRST = 1 (default)

    :param data_mode:

                        SPI_MODE0 = 0x00 (default)

                        SPI_MODE1  = 0x04

                        SPI_MODE2 = 0x08

                        SPI_MODE3 = 0x0C

    """