Adafruit MAX9744 Amplifier Code

Adafruit_MAX9744/Adafruit_I2C.py

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+../Adafruit_I2C/Adafruit_I2C.py

Adafruit_MAX9744/Adafruit_MAX9744.py

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+#!/usr/bin/python
+
+# Adafruit_MAX9744.py
+
+import RPi.GPIO as GPIO
+from Adafruit_I2C import Adafruit_I2C
+
+# Address of the amplifier
+MAX9744_I2CADDR = 0x4B
+#MAX9744_I2CADDR = 0x4A
+#MAX9744_I2CADDR = 0x49
+
+# GPIO pin number of mute pin
+MUTE_PIN = 17
+
+# GPIO pin number of shutdown pin
+SHUTDOWN_PIN = 27
+
+class Adafruit_MAX9744 :
+    # Constructor
+    def __init__(self, address=MAX9744_I2CADDR):
+        # Setup i2c
+        self.i2c = Adafruit_I2C(address)
+        self.address = address
+
+        # Setup GPIO for Shutdown and Mute pins
+        GPIO.setmode(GPIO.BCM)
+        GPIO.setup(SHUTDOWN_PIN, GPIO.OUT)
+        GPIO.setup(MUTE_PIN, GPIO.OUT)
+        GPIO.output(SHUTDOWN_PIN, True);
+        GPIO.output(MUTE_PIN, True);
+
+    # Write the volume level to the amplifier
+    def set_volume(self, value):
+        if value > 63:
+            value = 63
+        if value < 0:
+            value = 0
+        self.i2c.write8(0x00, value)
+
+    # Mute the amplifier
+    def set_mute(self, value):
+        if value == True:
+            GPIO.output(MUTE_PIN, False)
+        if value == False:
+            GPIO.output(MUTE_PIN, True)
+
+    # Shutdown the amplifier
+    def set_shutdown(self, value):
+        if value == True:
+            GPIO.output(SHUTDOWN_PIN, False)
+        if value == False:
+            GPIO.output(SHUTDOWN_PIN, True)
+
+    # Cleanup the GPIO pins when closing the program
+    def cleanup(self):
+        GPIO.cleanup()
+
+
+if __name__ == '__main__':
+
+    def menu():
+        print
+        print ('Commands:')
+        print ('  + to increase volume')
+        print ('  - to decrease volume')
+        print ('  m to mute amplifier')
+        print ('  u to unmute amplifier')
+        print ('  d to shutdown amplifier')
+        print ('  s to startup amplifier')
+        print ('  h to show this menu')
+        print ('  q to quit')
+        print
+
+    amp = Adafruit_MAX9744()
+    thevol = 31
+    c='0'
+    print
+    print ('Adafruit MAX9744 i2c Volume Control Demo')
+    menu()
+
+    amp.set_volume(thevol)
+    print ('Setting volume to ' + str(thevol))
+    print
+
+    # Read in + and - characters to set the volume.
+    while not (c == 'q'):
+        c = raw_input('Enter command: ')
+
+        # increase
+        if (c == '+'):
+            thevol=thevol+1
+            print ('Setting volume to ' + str(thevol))
+            amp.set_volume(thevol)
+
+        # decrease
+        elif (c == '-'):
+            thevol=thevol-1
+            print ('Setting volume to ' + str(thevol))
+            amp.set_volume(thevol)
+
+        # mute
+        elif (c == 'm'):
+            amp.set_mute(True)
+            print ('Mute is on')
+
+        # unmute
+        elif (c == 'u'):
+            amp.set_mute(False)
+            print ('Mute is off')
+
+        # shutdown
+        elif (c == 'd'):
+            amp.set_shutdown(True)
+            print ('Amplifier is off')
+
+        # startup
+        elif (c == 's'):
+            amp.set_shutdown(False)
+            print ('Amplifier is on')
+
+        # menu
+        elif (c == 'h'):
+            menu()
+
+        # ignore anything else
+
+        if (thevol > 63):
+            thevol = 63
+        if (thevol < 0):
+            thevol = 0
+
+    # Close program and cleanup GPIO
+    amp.cleanup()

Adafruit_MAX9744/Adafruit_MAX9744_Volume_CLI.py

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+#!/usr/bin/python
+
+# Adafruit_MAX9744_Volume_CLI.py
+
+from Adafruit_MAX9744 import Adafruit_MAX9744
+import sys, getopt
+
+def main(argv):
+    thevol = 31
+    mute = False
+    shutdown = False
+    amp = Adafruit_MAX9744()
+
+    try:
+        opts, args = getopt.getopt(argv,"hv:",["volume="])
+    except getopt.GetoptError:
+        print 'Usage: Adafruit_MAX9744_Volume_CLI.py -v <volume value 0-63>'
+        amp.cleanup()
+        sys.exit(2)
+    for opt, arg in opts:
+        if opt == '-h':
+            print 'Usage: Adafruit_MAX9744_Volume_CLI.py -v <volume value 0-63>'
+            amp.cleanup()
+            sys.exit()
+        if opt in ("-v", "--volume"):
+            thevol = int(arg)
+            amp.set_volume(thevol)
+            print
+            print ('Setting volume to ' + str(thevol))
+            print
+
+    # Cleanup GPIO on exit
+    amp.cleanup()
+
+if __name__ == "__main__":
+    main(sys.argv[1:])