def main():
"""Initialize SPI, send a few bytes, then close and exit."""
WATCH_DOG = 85
WATCH_DOG_REPLY = 170
DUMMY = 255
print 'initializing GPIO:', soc.bcm2835_init()
# Reset the AVR and the force GPIO8, pin 24, to high to enable the AVR
soc.bcm2835_gpio_fsel(soc.RPI_GPIO_P1_24, soc.BCM2835_GPIO_FSEL_OUTP)
soc.bcm2835_gpio_set(soc.RPI_GPIO_P1_24)
soc.bcm2835_gpio_clr(soc.RPI_GPIO_P1_24)
soc.bcm2835_gpio_set(soc.RPI_GPIO_P1_24)
time.sleep(10)
print 'initializing SPI:', soc.bcm2835_spi_begin()
soc.bcm2835_spi_setBitOrder(soc.BCM2835_SPI_BIT_ORDER_MSBFIRST)
soc.bcm2835_spi_setDataMode(soc.BCM2835_SPI_MODE0)
soc.bcm2835_spi_setClockDivider(soc.BCM2835_SPI_CLOCK_DIVIDER_65536)
soc.bcm2835_spi_chipSelect(soc.BCM2835_SPI_CS1)
soc.bcm2835_spi_setChipSelectPolarity(soc.BCM2835_SPI_CS0, soc.LOW)
while (True):
time.sleep(1)
soc.bcm2835_spi_transfer(WATCH_DOG) # send command
data_byte = soc.bcm2835_spi_transfer(DUMMY) # read response
if data_byte != WATCH_DOG_REPLY:
print 'Watchdog reply missing. received: ', data_byte
break
soc.bcm2835_spi_end()
print 'closing GPIO:', soc.bcm2835_close()
def watchdog(param={}):
"""Function that sends SPI commands to reset AVR controller watchdog time-out period."""
soc.bcm2835_spi_transfer(SPI_CMD_WDOG)
data_byte = soc.bcm2835_spi_transfer(DUMMY)
if data_byte != WATCH_DOG_REPLY:
# TODO is an AVR reset too harsh?
_avr_reset()
def _scroll_rtl(digits=(0, 0, 0, 0), digit_delay=1.0):
"""Scroll the digits into the display shifting them from right to left."""
for shift in range(0, 4):
cmd = SPI_CMD_MINUTES
digit_out = digits[shift]
for d in range(0, 4):
soc.bcm2835_spi_transfer(cmd)
digit_in = soc.bcm2835_spi_transfer(digit_out)
digit_out = digit_in
cmd = cmd + 1
watchdog()
time.sleep(digit_delay)
def _get_brightness():
"""Read light sensor then calculate and return brightness command value between 1 and 10."""
# Get light sensor value, which can be between 0 and 255
soc.bcm2835_spi_transfer(SPI_CMD_GET_LIGHT)
light_sensor = soc.bcm2835_spi_transfer(DUMMY)
br_cmd = int(light_sensor / 20.0)
if br_cmd > 10:
br_cmd = 10
elif br_cmd < 1:
br_cmd = 1
return br_cmd
def main():
"""Initialize SPI, send a few bytes, then close and exit."""
print 'initializing GPIO:', soc.bcm2835_init()
print 'initializing SPI:', soc.bcm2835_spi_begin()
soc.bcm2835_spi_setBitOrder(soc.BCM2835_SPI_BIT_ORDER_MSBFIRST)
soc.bcm2835_spi_setDataMode(soc.BCM2835_SPI_MODE0)
soc.bcm2835_spi_setClockDivider(soc.BCM2835_SPI_CLOCK_DIVIDER_65536)
soc.bcm2835_spi_chipSelect(soc.BCM2835_SPI_CS1)
soc.bcm2835_spi_setChipSelectPolarity(soc.BCM2835_SPI_CS0, soc.LOW)
for i in range(0, 100):
data_byte = soc.bcm2835_spi_transfer(i)
print 'sent:', i, 'returned:', data_byte
soc.bcm2835_spi_end()
print 'closing GPIO:', soc.bcm2835_close()
def _display(digits=(0, 0, 0, 0), brightness=-1):
"""
Send digits passed in a tuple, one number per Nixie tube.
Integers '0' to '9' correspond to number digits.
Integer '10' (DIGIT_OFF) signals a blank 'off' digit.
Integer '-1' signals skip digit update.
'brightness' of -1 skips display brightness change.
"""
# Send brightness command
if brightness > -1:
if brightness > 10:
brightness = 10
soc.bcm2835_spi_transfer(SPI_CMD_BRIGHTNESS)
soc.bcm2835_spi_transfer(int(brightness))
# Send digits
cmd = SPI_CMD_TENS_HOURS
for d in range(0, 4):
if (digits[d] >= 0 and digits[d] <= 9) or (digits[d] == DIGIT_OFF):
soc.bcm2835_spi_transfer(cmd)
data_byte = soc.bcm2835_spi_transfer(digits[d])
cmd = cmd - 1
def test_spi():
send_data = 0x10
read_data = io.bcm2835_spi_transfer(send_data)
print("Sent to SPI: 0x{0:2X}. Read back from SPI: 0x{1:2X}.".format(send_data, read_data))
if not send_data == read_data:
print("Do you have the loopback from MOSI to MISO connected?")
def main():
"""Initialize SPI, send a few bytes, then close and exit."""
SPI_CMD_WDOG = 85
WATCH_DOG_REPLY = 170
SPI_CMD_MINUTES = 1
SPI_CMD_TENS_MINUTES = 2
SPI_CMD_HOURS = 3
SPI_CMD_TENS_HOURS = 4
DUMMY = 255
print 'initializing GPIO:', soc.bcm2835_init()
# Reset the AVR and the force GPIO8, pin 24, to high to enable the AVR
soc.bcm2835_gpio_fsel(soc.RPI_GPIO_P1_24, soc.BCM2835_GPIO_FSEL_OUTP)
soc.bcm2835_gpio_set(soc.RPI_GPIO_P1_24)
soc.bcm2835_gpio_clr(soc.RPI_GPIO_P1_24)
soc.bcm2835_gpio_set(soc.RPI_GPIO_P1_24)
time.sleep(1)
print 'initializing SPI:', soc.bcm2835_spi_begin()
soc.bcm2835_spi_setBitOrder(soc.BCM2835_SPI_BIT_ORDER_MSBFIRST)
soc.bcm2835_spi_setDataMode(soc.BCM2835_SPI_MODE0)
soc.bcm2835_spi_setClockDivider(soc.BCM2835_SPI_CLOCK_DIVIDER_65536)
soc.bcm2835_spi_chipSelect(soc.BCM2835_SPI_CS1)
soc.bcm2835_spi_setChipSelectPolarity(soc.BCM2835_SPI_CS0, soc.LOW)
while (True):
for i in range(0, 5):
time.sleep(1)
soc.bcm2835_spi_transfer(SPI_CMD_MINUTES) # send command
data_byte = soc.bcm2835_spi_transfer(i) # send digit
soc.bcm2835_spi_transfer(SPI_CMD_TENS_MINUTES) # send command
data_byte = soc.bcm2835_spi_transfer(i * 2) # send digit
soc.bcm2835_spi_transfer(SPI_CMD_HOURS) # send command
data_byte = soc.bcm2835_spi_transfer((i * 2) + 1) # send digit
soc.bcm2835_spi_transfer(SPI_CMD_TENS_HOURS) # send command
data_byte = soc.bcm2835_spi_transfer(i + 5) # send digit
print 'cycle: ', i
# Periodic watch-dog 'keep alive'
soc.bcm2835_spi_transfer(SPI_CMD_WDOG) # send command
data_byte = soc.bcm2835_spi_transfer(DUMMY) # read response
if data_byte != WATCH_DOG_REPLY:
print 'Watchdog reply missing. received: ', data_byte
break
soc.bcm2835_spi_end()
print 'closing GPIO:', soc.bcm2835_close()
def main():
"""Initialize SPI, send a few bytes, then close and exit."""
SPI_CMD_MINUTES = 1
SPI_CMD_TENS_MINUTES = 2
SPI_CMD_HOURS = 3
SPI_CMD_TENS_HOURS = 4
SPI_CMD_BRIGHTNESS = 5
SPI_CMD_GET_LIGHT = 6
SPI_CMD_WDOG = 85
WATCH_DOG_REPLY = 170
DUMMY = 255
# Brightness value filter
br = [0, 0, 0, 0, 0]
print 'initializing GPIO:', soc.bcm2835_init()
# Reset the AVR and the force GPIO8, pin 24, to high to enable the AVR
soc.bcm2835_gpio_fsel(soc.RPI_GPIO_P1_24, soc.BCM2835_GPIO_FSEL_OUTP)
soc.bcm2835_gpio_set(soc.RPI_GPIO_P1_24)
soc.bcm2835_gpio_clr(soc.RPI_GPIO_P1_24)
soc.bcm2835_gpio_set(soc.RPI_GPIO_P1_24)
print 'initializing SPI:', soc.bcm2835_spi_begin()
soc.bcm2835_spi_setBitOrder(soc.BCM2835_SPI_BIT_ORDER_MSBFIRST)
soc.bcm2835_spi_setDataMode(soc.BCM2835_SPI_MODE0)
soc.bcm2835_spi_setClockDivider(soc.BCM2835_SPI_CLOCK_DIVIDER_65536)
soc.bcm2835_spi_chipSelect(soc.BCM2835_SPI_CS1)
soc.bcm2835_spi_setChipSelectPolarity(soc.BCM2835_SPI_CS0, soc.LOW)
while (True):
for i in range(0, 10):
time.sleep(0.5)
# Get light sensor value, which can be between 0 and 255
soc.bcm2835_spi_transfer(SPI_CMD_GET_LIGHT) # send command
light_sensor = soc.bcm2835_spi_transfer(DUMMY) # read response
# Convert light sensor input to a 0 to 10 brightness range
br.insert(0, int(light_sensor / 20.0))
br = br[:5]
brightness = (br[0] + br[1] + br[2] + br[3] + br[4]) / 5
if brightness > 10.0:
brightness = 10.0
elif brightness < 1:
brightness = 1
print 'Light sensor: ', light_sensor, ' Brightness: ', brightness
# Send brightness command
soc.bcm2835_spi_transfer(SPI_CMD_BRIGHTNESS) # send command
soc.bcm2835_spi_transfer(int(brightness)) # send brightness
# Send digits
soc.bcm2835_spi_transfer(SPI_CMD_MINUTES) # send command
data_byte = soc.bcm2835_spi_transfer(i) # send digit
soc.bcm2835_spi_transfer(SPI_CMD_TENS_MINUTES) # send command
data_byte = soc.bcm2835_spi_transfer(i) # send digit
soc.bcm2835_spi_transfer(SPI_CMD_HOURS) # send command
data_byte = soc.bcm2835_spi_transfer(i) # send digit
soc.bcm2835_spi_transfer(SPI_CMD_TENS_HOURS) # send command
data_byte = soc.bcm2835_spi_transfer(i) # send digit
# Periodic watch-dog 'keep alive'
soc.bcm2835_spi_transfer(SPI_CMD_WDOG) # send command
data_byte = soc.bcm2835_spi_transfer(DUMMY) # read response
if data_byte != WATCH_DOG_REPLY:
print 'Watch-dog reply missing. received: ', data_byte
break
soc.bcm2835_spi_end()
print 'closing GPIO:', soc.bcm2835_close()