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 initialize():
"""
Clock hardware initialization.
Any exceptions raised here should not abort the program,
but return a '0' to indicate initialization failure.
"""
# Initialize RPi GPIO
try:
gpio_initialized = soc.bcm2835_init()
# Reset the AVR and then force GPIO8, pin 24, to high to enable the AVR
soc.bcm2835_gpio_fsel(soc.RPI_GPIO_P1_24, soc.BCM2835_GPIO_FSEL_OUTP)
_avr_reset()
# 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)
except:
gpio_initialized = 0
return gpio_initialized
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 spi_init():
if io.bcm2835_spi_begin()==0:
print('SPI failed to initialize')
else:
print('SPI sucessfully initialized')
io.bcm2835_spi_setBitOrder(io.BCM2835_SPI_BIT_ORDER_MSBFIRST);
io.bcm2835_spi_setDataMode(io.BCM2835_SPI_MODE0);
#io.bcm2835_spi_setClockDivider(io.BCM2835_SPI_CLOCK_DIVIDER_65536);
#SPI_CLOCK_DIVIDER_128=128: about 2.0MHz
io.bcm2835_spi_setClockDivider(io.BCM2835_SPI_CLOCK_DIVIDER_128);
io.bcm2835_spi_chipSelect(io.BCM2835_SPI_CS0);
io.bcm2835_spi_setChipSelectPolarity(io.BCM2835_SPI_CS0, io.LOW);
print('SPI configured')
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 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()
