# See the License for the specific language governing permissions and
# limitations under the License.
-# This programs interprets the input of a physical interface thought the
-# GPIO pins of a Raspberry Pi to control an MPD server.
+# Backend to a hardware interface to control an MPD server from a Raspberry Pi
#
-# It suppot two inputs: a play/pause button and a rotary encoder to adjust
+# It supports two inputs: a play/pause button and a rotary encoder to adjust
# the volume.
#
# The each data output of the volume control are connected to the board
import mpd
import privileges
-redef class Object
- fun mpd: MPDConnection do return once new MPDConnection("localhost", 6600, "password")
-end
-
-class RotaryEncoder
- var pin_a: RPiPin
- var pin_b: RPiPin
- var old_a= false
- var old_b= false
+class PhysicalInterface
+ var mpd = new MPDConnection(server, port, password)
+ protected fun password: String do return "password"
+ fun server: String do return "localhost"
+ fun port: Int do return 6600
- # returns '<', '>' or null accoring to rotation or lack thereof
- fun update: nullable Char
- do
- var new_a = pin_a.lev
- var new_b = pin_b.lev
- var res = null
-
- if new_a != old_a or new_b != old_b then
- if not old_a and not old_b then
- # everything was on
- if not new_a and new_b then
- res = '<'
- else if new_a and not new_b then
- res = '>'
- end
- else if old_a and old_b then
- # everything was off
- if not new_a and new_b then
- res = '>'
- else if new_a and not new_b then
- res = '<'
- end
- end
+ var but_play: Switch is noinit
+ var but_playlist_a: Switch is noinit
- old_a = new_a
- old_b = new_b
- end
+ var vol: RotaryEncoder is noinit
+ var vol_step = 2
- return res
- end
-end
+ var lcd: HD44780 is noinit
-class LCD
- var rs: RPiPin
- var en: RPiPin
- var d4: RPiPin
- var d5: RPiPin
- var d6: RPiPin
- var d7: RPiPin
-
- var ds = new Array[RPiPin]
-
- # commands
- fun flag_clear_display: Int do return 1
- fun flag_return_home: Int do return 2
- fun flag_entry_mode_set: Int do return 4
- fun flag_display_control: Int do return 8
- fun flag_cursor_shift: Int do return 16
- fun flag_function_set: Int do return 32
- fun flag_set_cgram_addr: Int do return 64
- fun flag_set_ggram_addr: Int do return 128
-
- # entry mode
- fun flag_entry_right: Int do return 0
- fun flag_entry_left: Int do return 2
- fun flag_entry_shift_increment: Int do return 1
- fun flag_entry_shift_decrement: Int do return 0
-
- # display flags
- fun flag_display_on: Int do return 4
- fun flag_display_off: Int do return 0
- fun flag_cursor_on: Int do return 2
- fun flag_cursor_off: Int do return 0
- fun flag_blink_on: Int do return 1
- fun flag_blink_off: Int do return 0
-
- # display/cursor shift
- fun flag_display_move: Int do return 8
- fun flag_cursor_move: Int do return 0
- fun flag_move_right: Int do return 4
- fun flag_move_left: Int do return 0
-
- # function set
- fun flag_8bit_mode: Int do return 16
- fun flag_4bit_mode: Int do return 0
- fun flag_2_lines: Int do return 8
- fun flag_1_line: Int do return 0
- fun flag_5x10_dots: Int do return 4
- fun flag_5x8_dots: Int do return 0
-
- fun function_set(bits, lines, dots_wide: Int)
- do
- var fs = flag_function_set
- if bits == 8 then
- fs = fs.bin_or(16)
- else if bits != 4 then abort
+ var lcd_backlight: RPiPin is noinit
+ var lcd_backlight_delay = 1000
- if lines == 2 then
- fs = fs.bin_or(8)
- else if lines != 1 then abort
+ var buzzer: Buzzer is noinit
- if dots_wide == 10 then
- fs = fs.bin_or(4)
- else if dots_wide != 8 then abort
+ init
+ do
+ # commandline options for privileges drop
+ var opts = new OptionContext
+ var opt_ug = new OptionUserAndGroup.for_dropping_privileges
+ #opt_ug.mandatory = true
+ opts.add_option(opt_ug)
+
+ # parse and check command line options
+ opts.parse(args)
+ if not opts.errors.is_empty then
+ print opts.errors
+ print "Usage: {sys.program_name} [options]"
+ opts.usage
+ exit 1
+ end
- write(true, fs)
- end
+ assert bcm2835_init else print "Failed to init"
- fun display_control(on, cursor, blink: Bool)
- do
- var fs = flag_display_control
+ # drop privileges!
+ var user_group = opt_ug.value
+ if user_group != null then user_group.drop_privileges
- if on then
- fs = fs.bin_or(flag_display_on)
- else fs = fs.bin_or(flag_display_off)
+ # Play button
+ but_play = new Switch(new RPiPin.p1_13, new PUDControl.down)
- if cursor then
- fs = fs.bin_or(flag_cursor_on)
- else fs = fs.bin_or(flag_cursor_off)
+ # Playlist a button
+ but_playlist_a = new Switch(new RPiPin.p1_15, new PUDControl.down)
- if blink then
- fs = fs.bin_or(flag_blink_on)
- else fs = fs.bin_or(flag_blink_off)
+ # Vol +
+ var vol3 = new RPiPin.p1_03
+ vol3.fsel = new FunctionSelect.inpt
+ vol3.pud = new PUDControl.up
- write(true, fs)
- end
+ # Vol -
+ var vol5 = new RPiPin.p1_05
+ vol5.fsel = new FunctionSelect.inpt
+ vol5.pud = new PUDControl.up
- fun entry_mode(left, incr: Bool)
- do
- var fs = flag_entry_mode_set
+ vol = new RotaryEncoder(vol3,vol5)
- if left then
- fs = fs.bin_or(flag_entry_left)
- else fs = fs.bin_or(flag_entry_right)
+ # LCD
+ var lcd_rs = new RPiPin.p1_23
+ var lcd_en = new RPiPin.p1_21
+ var lcd_d4 = new RPiPin.p1_19
+ var lcd_d5 = new RPiPin.p1_26
+ var lcd_d6 = new RPiPin.p1_24
+ var lcd_d7 = new RPiPin.p1_22
+ lcd = new HD44780(lcd_rs, lcd_en, lcd_d4, lcd_d5, lcd_d6, lcd_d7)
+ lcd.setup
+ lcd.clear
- if incr then
- fs = fs.bin_or(flag_entry_shift_increment)
- else fs = fs.bin_or(flag_entry_shift_decrement)
+ lcd_backlight = new RPiPin.p1_18
+ lcd_backlight.fsel = new FunctionSelect.outp
- write(true, fs)
+ # Buzzer
+ var buzzer_pin = new RPiPin.p1_11
+ buzzer_pin.fsel = new FunctionSelect.outp
+ buzzer = new Buzzer(buzzer_pin)
end
- fun setup
+ fun run
do
- ds = [d4,d5,d6,d7]
-
- rs.fsel = new FunctionSelect.outp
- en.fsel = new FunctionSelect.outp
- d4.fsel = new FunctionSelect.outp
- d5.fsel = new FunctionSelect.outp
- d6.fsel = new FunctionSelect.outp
- d7.fsel = new FunctionSelect.outp
-
- rs.write(false)
- en.write(false)
-
- # wait 20ms for power up
- #50.bcm2835_delay
-
- #write_4bits(true,true,false,false)
- #write_4_bits(3)
-
- #5.bcm2835_delay
-
- #write_4bits(true,true,false,false)
- #write_4_bits(3)
-
- #5.bcm2835_delay
-
- #write_4bits(true,true,false,false)
- #write_4_bits(3)
-
- #200.bcm2835_delay_micros
-
- #write_4bits(false,true,false,false)
- #write_4_bits(2)
-
- # wait 5ms
- #5.bcm2835_delay
-
- # set interface
- # 4bits, 2 lines
- #write(true, flow)
- #function_set(4, 2, 8)
-
- # cursor
- # don't shift & hide
- #display_control(true, true, true)
+ var tick = 0
+ var last_event = 0
+ loop
+ var force_lcd_update = false
+
+ # play button
+ if but_play.changed and but_play.is_down then
+ print "but"
+ hit_play_stop
+ force_lcd_update = true
+ end
- # clear & home
- #write(true, flag_)
- #clear
+ if but_playlist_a.changed and but_playlist_a.is_down then
+ play_playlist_a
+ force_lcd_update = true
+ end
- # set cursor move direction
- # move right
- #write(true, 6)
+ # volume
+ var s = vol.update
+ if s != null then
+ if s == '<' then
+ print "vol down"
+ mpd.relative_volume = -vol_step
+ else # >
+ print "vol up"
+ mpd.relative_volume = vol_step
+ end
+ force_lcd_update = true
+ end
- # turn on display
- #write(true, 4)
+ # update lcd
+ if tick % 100 == 0 or force_lcd_update then
+ var status = mpd.status
+ var song = mpd.current_song
+
+ var status_char
+ if status == null then
+ lcd.text = "Unknown status"
+ else if song == null then
+ lcd.text = "No song playing"
+ else
+ if status.playing then
+ last_event = tick
+ status_char = ">"
+ else status_char = "#"
+
+ var tr = status.time_ratio
+ var pos = "-"
+ if tr != null then pos = (status.time_ratio*10.0).to_i.to_s
+
+ lcd.text = "{status_char} {song.artist}\n{pos} {song.title}"
+ end
+ end
- # set entry mode
- #entry_mode(true, true)
+ # manage backlight
+ if force_lcd_update then last_event = tick
- write(true, "33".to_hex)
- write(true, "32".to_hex)
- write(true, "28".to_hex)
- write(true, "0C".to_hex)
- write(true, "01".to_hex)
- end
+ var diff_with_last_event = tick - last_event
+ if diff_with_last_event == 0 then
+ lcd_backlight.write(true)
+ else if diff_with_last_event == lcd_backlight_delay then
+ lcd_backlight.write(false)
+ end
- fun write_4_bits(v: Int)
- do
- var lb = once [1,2,4,8]
- for i in [0..4[ do
- var b = lb[i]
- var r = b.bin_and(v) != 0
- var d = ds[i]
- d.write(r)
+ 10.bcm2835_delay
+ tick += 1
end
- pulse_enable
- end
-
- fun write_4bits(a,b,c,d:Bool)
- do
- d4.write(a)
- d5.write(b)
- d6.write(c)
- d7.write(d)
- pulse_enable
- end
-
- fun pulse_enable
- do
- en.write(false)
- 1.bcm2835_delay_micros
- en.write(true)
- 100.bcm2835_delay_micros
- en.write(false)
end
- fun write(is_cmd: Bool, cmd: Int)
+ fun hit_play_stop
do
- en.write(false)
- rs.write(not is_cmd)
-
- # high byte
- var hb = once [16,32,64,128]
- for i in [0..4[ do
- var b = hb[i]
- var r = b.bin_and(cmd) != 0
- var d = ds[i]
- d.write(r)
- end
-
- en.write(true)
-
- # wait 450 ns
- 1.bcm2835_delay_micros
-
- en.write(false)
-
- if is_cmd then
- # wait 5ms
- 5.bcm2835_delay
+ # get current status
+ var status = mpd.status
+ var playing = false
+ if status != null then
+ playing = status.playing
else
- # wait 200us
- 200.bcm2835_delay_micros
+ print "Cannot get state"
+ return
end
- # low byte
- var lb = once [1,2,4,8]
- for i in [0..4[ do
- var b = lb[i]
- var r = b.bin_and(cmd) != 0
- var d = ds[i]
- d.write(r)
- end
-
- en.write(true)
-
- # wait 450ns
- 1.bcm2835_delay_micros
-
- en.write(false)
-
- if is_cmd then
- # wait 5ms
- 5.bcm2835_delay
+ if playing then
+ # stop
+ print "playing -> stop"
+ mpd.pause
else
- # wait 200us
- 200.bcm2835_delay_micros
+ print "stopped -> play"
+ mpd.play
end
- end
- fun clear
- do
- write(true,1)
- 2.bcm2835_delay
+ bell
end
- fun return_home
+ fun play_playlist_a
do
- write(true,2)
- 2.bcm2835_delay
+ mpd.load_playlist("alexis")
end
- fun text=(v: String)
- do
- clear
- return_home
- for c in v do write(false, c.ascii)
- end
-end
-
-fun hit_play_stop
-do
- # get current status
- var status = mpd.status
- var playing = false
- if status != null then
- playing = status.state == "play"
- end
-
- if playing then
- # stop
- print "playing -> stop"
- mpd.pause
- else
- print "stopped -> play"
- mpd.play
- end
-end
-
-# commandline options for privileges drop
-var opts = new OptionContext
-var opt_ug = new OptionDropPrivileges
-#opt_ug.mandatory = true
-opts.add_option(opt_ug)
-
-# parse and check command line options
-opts.parse(args)
-if not opts.errors.is_empty then
- print opts.errors
- print "Usage: {program_name} [options]"
- opts.usage
- exit 1
+ fun bell do buzzer.buzz(1.5, 20)
end
-assert bcm2835_init else print "Failed to init"
-
-# drop privileges!
-var user_group = opt_ug.value
-if user_group != null then user_group.drop_privileges
-
-# Debug LED
-var out = new RPiPin.p1_11
-out.fsel = new FunctionSelect.outp
-out.write(false)
-
-# Play button
-var inp = new RPiPin.p1_13
-inp.fsel = new FunctionSelect.inpt
-inp.pud = new PUDControl.down
-
-# Vol +
-var vol3 = new RPiPin.p1_03
-vol3.fsel = new FunctionSelect.inpt
-vol3.pud = new PUDControl.up
-
-# Vol -
-var vol5 = new RPiPin.p1_05
-vol5.fsel = new FunctionSelect.inpt
-vol5.pud = new PUDControl.up
-
-var vol = new RotaryEncoder(vol3,vol5)
-var vol_step = 2
-
-# LCD
-var lcd_rs = new RPiPin.p1_23
-var lcd_en = new RPiPin.p1_21
-var lcd_d4 = new RPiPin.p1_19
-var lcd_d5 = new RPiPin.p1_26
-var lcd_d6 = new RPiPin.p1_24
-var lcd_d7 = new RPiPin.p1_22
-var lcd = new LCD(lcd_rs, lcd_en, lcd_d4, lcd_d5, lcd_d6, lcd_d7)
-lcd.setup
-#lcd.write(false, 'a'.to_i.to_ascii)
-lcd.clear
-lcd.write(false, 'a'.ascii)
-lcd.write(false, 'C'.ascii)
-
-var last_in = false
-var led_on = false
-var tick = 0
-loop
- # play button
- var lev = inp.lev
- if lev != last_in then
- last_in = lev
- if lev then
- print "hps"
- hit_play_stop
- end
- end
-
- # volume
- var s = vol.update
- if s != null then
- if s == '<' then
- print "vol down"
- mpd.relative_volume = -vol_step
- else # >
- print "vol up"
- mpd.relative_volume = vol_step
- end
- end
-
- if tick % 100 == 0 then
- print tick
- #var now_playing = mpd.status("")
- #lcd.text = tick.to_s
- end
-
- 10.bcm2835_delay
- tick += 1
-end
+var phy = new PhysicalInterface
+phy.run
nitlanguage / nit.git / blobdiff