Merge pull request #25 from semininja/main

add option to specify baudrate

Author: tekktrik

adafruit_74hc595.py

@@ -120,17 +120,18 @@ def pull(self, val: digitalio.Pull):  # pylint: disable=no-self-use
 
 
 class ShiftRegister74HC595:
-    """Initialise the 74HC595 on specified SPI bus
-    and indicate the number of shift registers being used
+    """Initialise the 74HC595 on specified SPI bus, indicate the
+    number of shift registers being used and optional baudrate.
     """
 
     def __init__(
         self,
         spi: busio.SPI,
         latch: digitalio.DigitalInOut,
         number_of_shift_registers: int = 1,
+        baudrate: int = 1000000,
     ):
-        self._device = spi_device.SPIDevice(spi, latch, baudrate=1000000)
+        self._device = spi_device.SPIDevice(spi, latch, baudrate=baudrate)
         self._number_of_shift_registers = number_of_shift_registers
         self._gpio = bytearray(self._number_of_shift_registers)