def ISR():
ISRCount + 1
# // increment the overlflow counter
if (ISRCount == servos[Channel].counter):
# // are we on the final iteration for this channel{
TCNT2 = servos[Channel].remainder
# // yes, set count for overflow after remainder ticks
return TCNT2
elif (ISRCount > servos[Channel].counter):
# // we have finished timing the channel so pulse it low and move on
if True:
bitbangio.SPI()
# // check if activated
Channel = digitalio.DigitalInOut(board.D12)
Channel.value = False
# // pulse this channel low if active
Channel + 1 # // increment to the next channel
ISRCount = 0 # // reset the isr iteration counter
TCNT2 = 0
# // reset the clock counter register
return
if ((Channel != FRAME_SYNC_INDEX) and (Channel <= NBR_CHANNELS)):
# // check if we need to pulse this channel
# set correct servo later
servo1 = pulseio.PWMOUT(board.D5, frequency=5000, duty_cycle=50)
while True:
# // check if activated
Channel = digitalio.DigitalInOut(board.D12)
Channel.value = True
return
elif Channel > NBR_CHANNELS:
Channel = 0 # // all done so start over
return
)
##########################################
print(42 * '*')
print("initialise digitalio pins for SPI")
spi_clock = digitalio.DigitalInOut(board.SCK)
spi_clock.direction = digitalio.Direction.OUTPUT
spi_mosi = digitalio.DigitalInOut(board.MOSI)
spi_mosi.direction = digitalio.Direction.OUTPUT
spi_miso = digitalio.DigitalInOut(board.MISO)
spi_miso.direction = digitalio.Direction.INPUT
# print((42 * '*') + "\n" + "init busio.SPI")
# spi = busio.SPI(board.SCK, MOSI=board.MOSI, MISO=board.MISO)
print("init bitbangio.SPI")
spi = bitbangio.SPI(board.SCK, MOSI=board.MOSI, MISO=board.MISO)
# maximum frequency is currently hardcoded to 6MHz
# https://github.com/adafruit/circuitpython/blob/master/ports/atmel-samd/common-hal/pulseio/PWMOut.c#L119
gsclk_freqency = (6000 * 1000) # 6MHz
gsclk = pulseio.PWMOut(
board.D9, duty_cycle=(2 ** 15), frequency=gsclk_freqency)
print("gsclk.frequency: {:}MHz".format(gsclk.frequency / (1000*1000)))
latch = digitalio.DigitalInOut(board.D7)
latch.direction = digitalio.Direction.OUTPUT
##########################################
print(42 * '*')
print("define pixel array / init TLC5957")
num_leds = 16
## 74hc595 testing
## https://learn.adafruit.com/circuitpython-basics-i2c-and-spi/spi-devices
## https://circuitpython.readthedocs.io/projects/busdevice/en/latest/api.html
import board #hardware details of the specific board that you are using
import busio
import digitalio
from board import *
#from adafruit_bus_device.spi_device import SPIDevice
import bitbangio
import time
# (SCK, MOSI, MISO) sck to 74hc595 pin 11 and mosi to 74hc595 pin 14
#with bitbangio.SPI(board.D52, board.D51, None) as spi_bus:
with bitbangio.SPI(board.D3, board.D2, None) as spi_bus:
#cs = digitalio.DigitalInOut(D5) # chip select == Latch_pin == 74hc595 pin 12
cs = digitalio.DigitalInOut(
D4) # chip select == Latch_pin == 74hc595 pin 12
cs.direction = digitalio.Direction.OUTPUT
cs.value = False
bytes_read = bytearray(4) # read buffer
bytes_write = bytearray(1) # one byte buffer for write data
while True:
for testdata in range(256): # test data is all bytes 0 to 255
while not spi_bus.try_lock(): # wait for bus available
pass
bytes_write[0] = testdata #put one byte in transmit buffer
duty_cycle = 0
servos = pulseio.PWMOUT(board.D5, frequency=5000, duty_cycle=0)
FRAME_SYNC_INDEX = 0
NBR_CHANNELS = 8
servo_t = servos[NBR_CHANNELS + 1]
DEFAULT_PULSE_WIDTH = duty_cycle
# // frame sync delay is the first entry in the channel array
FRAME_SYNC_PERIOD = 20000 # // total frame duration in microseconds
FRAME_SYNC_DELAY = ((FRAME_SYNC_PERIOD -
(NBR_CHANNELS * DEFAULT_PULSE_WIDTH)) / 128)
# // number of iterations of the ISR to get the desired frame rate
DELAY_ADJUST = time.sleep(.08)
# // number of microseconds of calculation overhead to be subtracted
# from pulse timings
Channel = 0
SPI = bitbangio.SPI(21, MOSI=board.D11, MISO=board.D12)
def ISR():
ISRCount + 1
# // increment the overlflow counter
if (ISRCount == servos[Channel].counter):
# // are we on the final iteration for this channel{
TCNT2 = servos[Channel].remainder
# // yes, set count for overflow after remainder ticks
return TCNT2
elif (ISRCount > servos[Channel].counter):
# // we have finished timing the channel so pulse it low and move on
if True:
bitbangio.SPI()
