def distance_mm(self):
spi.init(baudrate=125000,
sclk=self.sclk_pin,
mosi=self.trigger_pin,
miso=self.echo_pin)
pre = 0
post = 0
k = -1
length = 500
resp = bytearray(length)
resp[0] = 0xFF
spi.write_readinto(resp, resp)
# find first non zero value
try:
i, value = next((ind, v) for ind, v in enumerate(resp) if v)
except StopIteration:
i = -1
if i > 0:
pre = bin(value).count("1")
# find first non full high value afterwards
try:
k, value = next((ind, v)
for ind, v in enumerate(resp[i:length - 2])
if resp[i + ind + 1] == 0)
post = bin(value).count("1") if k else 0
k = k + i
except StopIteration:
i = -1
dist = -1 if i < 0 else round(
((pre + (k - i) * 8. + post) * 8 * 0.172) / 2)
return dist
def init(self): #set buf with setup commands, turn on display, clear display and make ready for commands buf = bytearray([self.FUNCTION_SET1_CMD, self.DISPLAY_ON, self.CLEAR_DISPLAY, 0x06]) #set the spi pins and frequency spi.init(baudrate=250000, bits=8, mode=0, sclk=pin13, mosi=pin15, miso=pin14) sleep(1000) #send setup to the LCD spi.write(buf) self.initalised = True
def __init__(self):
c = b'\xAE\xA4\xD5\xF0\xA8\x3F\xD3\x00\x00\x8D' \
b'\x14\x20\x00\x21\x00\x7F\x22\x00\x3F\xa1' \
b'\xc8\xDA\x12\x81\xCF\xd9\xF1\xDB\x40\xA6\xd6\x00\xaf'
pin14.write_digital(0)
spi.init(miso=pin15, baudrate=8000000)
pin14.write_digital(1)
self.__cmd(c)
self.screen = bytearray(1024)
def NFC_setup():
# display.off()
spi.init(baudrate=1000000,
bits=8,
mode=0,
sclk=pin13,
mosi=pin15,
miso=pin14)
print("SPI Init")
CS_PIN.write_digital(1)
if RST_PIN.read_digital() == 0:
RST_PIN.write_digital(0)
# give a few microseconds for nfc to reset
utime.sleep_us(2)
RST_PIN.write_digital(1)
utime.sleep_us(50000)
print("version:")
byt = NFC_read_register(0x37 << 1)
print(byt)
NFC_write_register(TxModeRegister, 0x00)
NFC_write_register(RxModeRegister, 0x00)
# Reset ModWidthReg
NFC_write_register(ModWidthRegister, 0x26)
# TAuto=1; timer starts automatically at the end of the transmission
# in all communication modes at all speeds
NFC_write_register(TModeRegister, 0x80)
# TPreScaler = TModeReg[3..0]:TPrescalerReg, ie 0x0A9 = 169 =>
# f_timer=40kHz,ie a timer period of 25μs.
NFC_write_register(TPrescalarRegister, 0xA9)
# Reload timer with 0x3E8 = 1000, ie 25ms before timeout.
NFC_write_register(TReloadRegisterH, 0x03)
NFC_write_register(TReloadRegisterL, 0xE8)
# Default 0x00. Force a 100 % ASK modulation independent of
# the ModGsPReg register setting
NFC_write_register(TxASKRegister, 0x40)
# Default 0x3F. Set the preset value for the CRC coprocessor
# for the CalcCRC command to 0x6363 (ISO 14443-3 part 6.2.4)
NFC_write_register(ModeRegister, 0x3D)
NFC_antenna_on()
def init_spi():
global g_spi_initialized
if g_spi_initialized is False:
spi.init(baudrate=SPI_BAUDRATE, sclk=pin16, mosi=pin16, miso=pin15)
g_spi_initialized = True
def __init__(self, spi, cs):
self.spi = spi
self.cs = cs
self.buffer = bytearray(8)
spi.init()
self.init()
def __init__(self):
spi.init()
pin16.write_digital(1) # setup CS and set to high
pass