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# Raspberry Pi Pico + YM2149 Soundchip test example
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| # Raspberry Pi Pico + YM2149 Soundchip test example | |
| # Based on https://github.com/FlorentFlament/ym2149-test | |
| # http://www.ym2149.com/ym2149.pdf | |
| # Pins | |
| # Pico -> YM2149 (DIL) | |
| # GP5 -> CLOCK (22) | |
| # GP6 -> BC1 (29) | |
| # GP7 -> BDIR (27) | |
| # GP8 to GP15 -> DA0 to DA7 (37 to 30) | |
| # VBUS to RESET (23) | |
| # VBUS to BC2 (28) | |
| # VBUS to VCC (40) | |
| from machine import Pin | |
| from rp2 import PIO, StateMachine, asm_pio | |
| import utime | |
| PIO_FREQ = 50000000 #gives us a 20ns cycle time which we can use for delay multipliers | |
| ADDRESS_MODE = 3 | |
| WRITE_MODE = 2 | |
| READ_MODE = 1 #unused | |
| INACTIVE_MODE = 0 | |
| # TODO: Can we combine these 2 functions - the only difference is the control pin values for the mode? | |
| # 8-bit parallel data bus with 2 control pins | |
| # sets the address mode on the bus control pins and writes the supplied data to 8 pins | |
| # cycle time is 1 / PIO_FREQ | |
| # each instruction takes 1 cycle and you can delay for [n] more cycles after each instruction | |
| @asm_pio(sideset_init=PIO.OUT_LOW, out_init=(rp2.PIO.OUT_LOW,) * 8, out_shiftdir=PIO.SHIFT_RIGHT, | |
| autopull=True, pull_thresh=16 ) | |
| def set_address(): | |
| pull() #pull data from the transmit SR | |
| nop() .side(3) #set the mode to address on pins | |
| out(pins, 8) [7] #output data to 8 pins and wait for 7 more cycles | |
| nop() [6] #wait for another 7 cycles (1 instruction + 6) - 300ns total | |
| nop() .side(0) [3] #set mode to inactive for 80ns (1 instruction + 3 cycles) | |
| # 8-bit parallel data bus with 2 control pins | |
| # sets the write mode on the bus control pins and behaves as above | |
| @asm_pio(sideset_init=PIO.OUT_LOW, out_init=(rp2.PIO.OUT_LOW,) * 8, out_shiftdir=PIO.SHIFT_RIGHT, | |
| autopull=True, pull_thresh=16 ) | |
| def set_data(): | |
| pull() #pull data from the transmit SR | |
| nop() .side(2) #set the mode to write on pins | |
| out(pins, 8) [7] #output data to 8 pins and wait for 7 more cycles | |
| nop() [6] #wait for another 7 cycles (1 instruction + 6) - 300ns total | |
| nop() .side(0) [3] #set mode to inactive for 80ns (1 instruction + 3 cycles) | |
| address_sm = StateMachine(0, set_address, freq=PIO_FREQ, sideset_base=Pin(6), out_base=Pin(8)) | |
| data_sm = StateMachine(0, set_data, freq=PIO_FREQ, sideset_base=Pin(6), out_base=Pin(8)) | |
| address_sm.active(1) #Activate address program in first PIO | |
| data_sm.active(2) #Activate address program in second PIO | |
| def send_data(address, data): | |
| address_sm.put(address) | |
| data_sm.put(data) | |
| # 2MHz clock frequency for the YM1249 (affects frequency multiplier for notes) | |
| CLOCK_FREQ = 2000000 | |
| def setup_clock(): | |
| clock = machine.PWM(machine.Pin(5)) | |
| clock.freq(CLOCK_FREQ) | |
| clock.duty_u16(32768) | |
| # Simple C, D, E, F, G, A, B note sequence | |
| note_freqs = [130.81, 146.83, 164.81, 174.61, 196.00, 220.00, 246.94] | |
| # Convert this to values that YM2149 understands | |
| def note_to_data_val(freq): | |
| return int((CLOCK_FREQ / (16 * freq))) | |
| notes = list(map(note_to_data_val, note_freqs)) | |
| setup_clock() | |
| # Initialise registers to 0 | |
| for i in range(16): | |
| send_data(i, 0) | |
| send_data(7, 0xf8) #Mixer setup: Only output clear sound (no noise) | |
| send_data(8, 0x0f) # Volume A - fixed, no envelope | |
| send_data(9, 0x0f) # Volume B - fixed, no envelope | |
| send_data(10, 0x0f) # Volume C - fixed, no envelope | |
| while True: | |
| for i in range(7): | |
| send_data(0, notes[i] & 0xff) | |
| send_data(1, notes[i] >> 8) | |
| send_data(2, notes[i] >> 1 & 0xff) | |
| send_data(3, notes[i] >> 9) | |
| send_data(4, notes[i] >> 2 & 0xff) | |
| send_data(5, notes[i] >> 10) | |
| utime.sleep(0.5) |
Outputting sound on one channel, but more than one seems to be problematic. Still dodgy wiring. This works - some of the time...
# Raspberry Pi Pico + YM2149 Soundchip test example
# Based on https://github.com/FlorentFlament/ym2149-test
# http://www.ym2149.com/ym2149.pdf
# Pins
# Pico -> YM2149 (DIL)
# GP5 -> CLOCK (22)
# GP6 -> BC1 (29)
# GP7 -> BDIR (27)
# GP8 to GP15 -> DA0 to DA7 (37 to 30)
# VBUS to RESET (23)
# VBUS to BC2 (28)
# VBUS to VCC (40)
from machine import Pin
from rp2 import PIO, StateMachine, asm_pio
import utime
PIO_FREQ = 5000000 #gives us a 20ns cycle time which we can use for delay multipliers
@asm_pio(sideset_init=[rp2.PIO.OUT_LOW] * 2, out_init=[rp2.PIO.OUT_LOW] * 8, out_shiftdir=PIO.SHIFT_RIGHT, pull_thresh=16, push_thresh=8 )
def pio_test():
pull() .side(0x3) #set the mode to address on pins
out(pins, 8) [1] #output first byte (address) from FIFO to 8 pins and wait for 7 more cycles
nop() [3]
nop() [3]
nop() [1] #wait for another 7 cycles (1 instruction + 6) - 300ns total
nop() [3]
nop() [3]
nop() .side(0x0) [3] #set mode to inactive for 80ns (1 instruction + 3 cycles)
nop() .side(0x2)
out(pins, 8) [1] #output second byte (data) from FIFO to 8 pins and wait for 7 more cycles
nop() [3]
nop() [3]
nop() [1] #wait for another 7 cycles (1 instruction + 6) - 300ns total
nop() [3]
nop() [3]
nop() .side(0x0) [3] #set mode to inactive for 80ns (1 instruction + 3 cycles)
ym2149_out = StateMachine(0, pio_test, freq=PIO_FREQ, sideset_base=Pin(6), out_base=Pin(8))
ym2149_out.active(1) #Activate address program in first PIO
# 2MHz clock on pin 5
CLOCK_FREQ = 2000000
def setup_clock():
clock = machine.PWM(machine.Pin(5))
clock.freq(CLOCK_FREQ)
clock.duty_u16(32768)
# Simple C, D, E, F, G, A, B note sequence
note_freqs = [130.81, 146.83, 164.81, 174.61, 196.00, 220.00, 246.94]
#Take a wild guess
theme = [
[146.83, 0.66],
[146.83, 0.66],
[146.83, 0.66],
[196.00, 4],
[2*146.83, 4],
[294.00, 0.66],
[246.94, 0.66],
[220.00, 0.66],
[2*196.00, 4],
[2*146.83, 2],
[294.00, 0.66],
[246.94, 0.66],
[220.00, 0.66],
[2*196.00, 4],
[2*130.81, 2],
[294.00, 0.66],
[246.94, 0.66],
[294.00, 0.66],
[220.00, 4],
[0, 0.66],
[130.81, 0.66],
[130.81, 0.66]
]
# Convert this to values that YM2149 understands
def note_to_data_val(freq):
return int((CLOCK_FREQ / (16 * (freq * 2))))
notes = list(map(note_to_data_val, note_freqs))
setup_clock()
def set_register(address, data):
ym2149_out.put((data << 8) | (address & 0xff))
utime.sleep(0.005)
for i in range(16):
set_register(i, 0)
set_register(7, 0xf8) #Mixer setup: Only output clear sound (no noise)
set_register(8, 0x0f) # Volume A - fixed, no envelope
set_register(9, 0x0f) # Volume B - fixed, no envelope
set_register(10, 0x0f) # Volume C - fixed, no envelope
while True:
for i in range(len(theme)):
freq_time = theme[i]
note = 0
if freq_time[0] != 0:
note = note_to_data_val(freq_time[0])
print("note: {}: {}".format(note, freq_time))
set_register(0, (note & 0xff))
set_register(1, (note >> 8))
#set_register(2, ((note >> 1) & 0xff))
#set_register(3, (note >> 9))
#set_register(4, ((note >> 2) & 0xff))
#set_register(5, (note >> 10))
utime.sleep(0.25 * freq_time[1])
Testing CircuitPython's PIO
import array
import time
import random
import usb_midi
import adafruit_midi
# Raspberry Pi Pico + CircuitPython, testing 8bit bus
# http://www.ym2149.com/ym2149.pdf
# Pins
# Pico -> YM2149 (DIL)
# GP5 -> CLOCK (22)
# GP6 -> BC1 (29)
# GP7 -> BDIR (27)
# GP8 to GP15 -> DA0 to DA7 (37 to 30)
# VBUS to RESET (23)
# VBUS to BC2 (28)
# VBUS to VCC (40)
import board
import rp2pio
import adafruit_pioasm
import pwmio
PIO_FREQ = 5000000 #gives us a 20ns cycle time which we can use for delay multipliers
pio_test = """
.side_set 2
.wrap_target
pull side 3 ;set the mode to address on pins
out pins, 8 [1] ;output first byte (address) from FIFO to 8 pins and wait for 7 more cycles
nop [3]
nop [3]
nop [1] ;wait for another 7 cycles (1 instruction + 6) - 300ns total
nop [3]
nop [3]
nop side 0 [3] ;set mode to inactive for 80ns (1 instruction + 3 cycles)
nop side 2
out pins, 8 [1] ;output second byte (data) from FIFO to 8 pins and wait for 7 more cycles
nop [3]
nop [3]
nop [1] ;wait for another 7 cycles (1 instruction + 6) - 300ns total
nop [3]
nop [3]
nop side 0 [3] ;set mode to inactive for 80ns (1 instruction + 3 cycles)
.wrap
"""
assembled = adafruit_pioasm.assemble(pio_test)
ym2149_out = rp2pio.StateMachine(
assembled,
frequency=PIO_FREQ,
first_out_pin=board.GP8,
first_sideset_pin=board.GP6,
sideset_pin_count=2,
out_pin_count=8,
out_shift_right=True,
pull_threshold=16,
push_threshold=8
)
# 2MHz clock on pin 5
CLOCK_FREQ = 2000000
def setup_clock():
clock = pwmio.PWMOut(board.GP5, frequency=CLOCK_FREQ, duty_cycle=32768)
led = pwmio.PWMOut(board.LED, frequency=5000, duty_cycle=32768)
setup_clock()
def set_register(address, data):
combined = array.array("B", [address, data])
ym2149_out.write(combined)
time.sleep(0.005)
while True:
set_register(0x55, 0xaa)
time.sleep(0.05)
Output on PiScope - doesn't seem to hold the bus values for the duration as it does above:
O
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Sort of working code - getting some sound out of it, but intermittent. Either timing, or dodgy wiring...