mirror of
https://github.com/im-tomu/fomu-workshop.git
synced 2024-09-20 03:10:12 +00:00
120 lines
3.0 KiB
Python
Executable File
120 lines
3.0 KiB
Python
Executable File
#!/usr/bin/env python3
|
|
"""Simple tri-colour LED blink example."""
|
|
|
|
# Import lxbuildenv to integrate the deps/ directory
|
|
import os, sys
|
|
sys.path.insert(0, os.path.dirname(__file__))
|
|
sys.path.insert(0, os.path.join(os.path.dirname(__file__), "..", "litex"))
|
|
import lxbuildenv
|
|
|
|
from migen import *
|
|
import fomu
|
|
|
|
if 'FOMU_REV' not in os.environ:
|
|
print('Board type must be specified in FOMU_REV environment variable!')
|
|
exit(1)
|
|
|
|
#
|
|
# Parameters from iCE40 UltraPlus LED Driver Usage Guide, pages 19-20
|
|
#
|
|
|
|
# Current modes
|
|
RGBA_CURRENT_MODE_FULL = '0b0'
|
|
RGBA_CURRENT_MODE_HALF = '0b1'
|
|
|
|
# Current levels in Full / Half mode
|
|
RGBA_CURRENT_04MA_02MA = '0b000001'
|
|
RGBA_CURRENT_08MA_04MA = '0b000011'
|
|
RGBA_CURRENT_12MA_06MA = '0b000111'
|
|
RGBA_CURRENT_16MA_08MA = '0b001111'
|
|
RGBA_CURRENT_20MA_10MA = '0b011111'
|
|
RGBA_CURRENT_24MA_12MA = '0b111111'
|
|
|
|
#
|
|
# Signals
|
|
#
|
|
counter = Signal(28)
|
|
|
|
rgb0_pwm = Signal(1)
|
|
rgb1_pwm = Signal(1)
|
|
rgb2_pwm = Signal(1)
|
|
|
|
# Setup platform and correctly map pins for the
|
|
# iCE40UP5K SB_RGBA_DRV hard macro.
|
|
if os.environ['FOMU_REV'] in ['evt1', 'evt2']:
|
|
platform = fomu.FomuEvt2Platform()
|
|
blue_pwm = rgb0_pwm
|
|
red_pwm = rgb1_pwm
|
|
green_pwm = rgb2_pwm
|
|
elif os.environ['FOMU_REV'] == 'evt3':
|
|
platform = fomu.FomuEvt3Platform()
|
|
blue_pwm = rgb0_pwm
|
|
red_pwm = rgb1_pwm
|
|
green_pwm = rgb2_pwm
|
|
elif os.environ['FOMU_REV'] == 'hacker':
|
|
platform = fomu.FomuHackerPlatform()
|
|
blue_pwm = rgb0_pwm
|
|
green_pwm = rgb1_pwm
|
|
red_pwm = rgb2_pwm
|
|
elif os.environ['FOMU_REV'] == 'pvt':
|
|
platform = fomu.FomuPvtPlatform()
|
|
green_pwm = rgb0_pwm
|
|
red_pwm = rgb1_pwm
|
|
blue_pwm = rgb2_pwm
|
|
else:
|
|
print('Board not supported!')
|
|
exit(2)
|
|
|
|
usb_pins = platform.request('usb')
|
|
rgb_pins = platform.request('rgb_led')
|
|
|
|
m = Module()
|
|
|
|
###
|
|
|
|
# Drive the USB outputs to constant values as they are not in use.
|
|
# Assign USB pins to "0" so as to disconnect Fomu from
|
|
# the host system. Otherwise it would try to talk to
|
|
# us over USB, which wouldn't work since we have no stack.
|
|
m.comb += [
|
|
usb_pins.d_p.eq(0),
|
|
usb_pins.d_n.eq(0),
|
|
usb_pins.pullup.eq(0)
|
|
]
|
|
|
|
m.comb += [
|
|
red_pwm.eq(counter[24]),
|
|
green_pwm.eq(counter[23]),
|
|
blue_pwm.eq(counter[25])
|
|
]
|
|
|
|
# Increment counter on clock signal
|
|
m.sync += counter.eq(counter + 1)
|
|
|
|
# Instantiate iCE40 LED driver hard logic, connecting up
|
|
# latched button state, counter state, and LEDs.
|
|
#
|
|
# Note that it's possible to drive the LEDs directly,
|
|
# however that is not current-limited and results in
|
|
# overvolting the red LED.
|
|
#
|
|
# See also:
|
|
# https://www.latticesemi.com/-/media/LatticeSemi/Documents/ApplicationNotes/IK/ICE40LEDDriverUsageGuide.ashx?document_id=50668
|
|
m.specials += Instance(
|
|
'SB_RGBA_DRV',
|
|
i_CURREN=0b1,
|
|
i_RGBLEDEN=0b1,
|
|
i_RGB0PWM=rgb0_pwm,
|
|
i_RGB1PWM=rgb1_pwm,
|
|
i_RGB2PWM=rgb2_pwm,
|
|
o_RGB0=rgb_pins.r,
|
|
o_RGB1=rgb_pins.g,
|
|
o_RGB2=rgb_pins.b,
|
|
p_CURRENT_MODE=RGBA_CURRENT_MODE_HALF,
|
|
p_RGB0_CURRENT=RGBA_CURRENT_08MA_04MA,
|
|
p_RGB1_CURRENT=RGBA_CURRENT_08MA_04MA,
|
|
p_RGB2_CURRENT=RGBA_CURRENT_08MA_04MA
|
|
)
|
|
|
|
platform.build(m)
|