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Sleeping
Sleeping
File size: 1,541 Bytes
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from periphery import GPIO
from spidev import SpiDev
from time import sleep
WAKEUP = 0x02
STANDBY = 0x04
RESET = 0x06
START = 0x08
STOP = 0x0A
RDATAC = 0x10
SDATAC = 0x11
RDATA = 0x12
RREG = 0x20
WREG = 0x40
class Frontend:
def __init__(self):
self.nrst = GPIO("/dev/gpiochip2", 9, "out")
self.pwdn = GPIO("/dev/gpiochip2", 12, "out")
self.start = GPIO("/dev/gpiochip3", 29, "out")
self.dev = SpiDev()
self.dev.open(0, 0)
self.dev.max_speed_hz = 8000000
self.dev.mode = 0b01
self.start.write(False)
self.powerup()
self.reset()
self.stop_continuous()
def powerup(self):
self.pwdn.write(True)
sleep(0.1)
def powerdown(self):
self.pwdn.write(False)
def reset(self):
self.nrst.write(False)
sleep(0.01)
self.nrst.write(True)
sleep(0.1)
def read_regs(self, start, len):
values = self.dev.xfer([RREG | (start & 0x1F), (len - 1) & 0x1F] + [0x00] * len)
return values[2:]
def write_regs(self, start, values):
self.dev.xfer([WREG | (start & 0x1F), (len(values) - 1) & 0x1F] + values)
def read(self, len):
values = self.dev.xfer([RDATA] + [0x00] * len)
return values[1:]
def start_continuous(self):
self.dev.xfer([RDATAC])
def stop_continuous(self):
self.dev.xfer([SDATAC])
def read_continuous(self, len):
values = self.dev.xfer([0x00] * len)
def close(self):
self.dev.close()
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