class bitbang_spi:
def __init__(self, spi_cs, spi_mosi, spi_miso, spi_clk, rising_data = True, latch = None, enable_low = True):
self.gpio = GPIO()
self.rising_data = rising_data
self.enable_low = enable_low
self.spi_cs = spi_cs
self.spi_mosi = spi_mosi
self.spi_miso = spi_miso
self.spi_clk = spi_clk
self.latch = latch
self.gpio.set_output(spi_cs)
self.gpio.set_output(spi_mosi)
self.gpio.set_output(spi_clk)
if self.spi_miso != None:
self.gpio.set_input(spi_miso)
if self.latch != None:
self.gpio.set_output(latch)
self.gpio.set_value(spi_cs, self.enable_low)
def transfer(self, payload, bits = 8):
self.gpio.set_value(self.spi_cs, not self.enable_low)
self.gpio.set_value(self.spi_clk, self.gpio.LOW)
if self.latch != None:
self.gpio.set_value(self.latch, self.gpio.LOW)
response = 0
for i in range(bits):
response = response << 1
# data clocked in on clock rising edge
self.gpio.set_value(self.spi_mosi, (payload >> (bits - (i + 1))) & 0x01)
self.gpio.set_value(self.spi_clk, self.gpio.HIGH)
if self.spi_miso != None:
response |= self.gpio.read_value(self.spi_miso)
if self.latch!= None and i == bits - 1:
self.gpio.set_value(self.latch, self.gpio.HIGH)
self.gpio.set_value(self.spi_clk, self.gpio.LOW)
if self.latch != None:
self.gpio.set_value(self.latch, self.gpio.LOW)
self.gpio.set_value(self.spi_cs, self.enable_low)
return response
class bitbang_spi:
def __init__(self, spi_cs, spi_mosi, spi_miso, spi_clk):
self.gpio = GPIO()
self.spi_cs = spi_cs
self.spi_mosi = spi_mosi
self.spi_miso = spi_miso
self.spi_clk = spi_clk
self.gpio.set_output(spi_cs)
self.gpio.set_output(spi_mosi)
self.gpio.set_output(spi_clk)
if self.spi_miso != None:
self.gpio.set_input(spi_miso)
self.gpio.set_value(spi_cs, self.gpio.HIGH)
def transfer(self, payload, bits = 8):
self.gpio.set_value(self.spi_cs, self.gpio.LOW)
self.gpio.set_value(self.spi_clk, self.gpio.LOW)
response = 0
for i in range(bits):
response = response << 1
# data clocked in on clock rising edge
self.gpio.set_value(self.spi_mosi, (payload >> (bits - (i + 1))) & 0x01)
self.gpio.set_value(self.spi_clk, self.gpio.HIGH)
if self.spi_miso != None:
response |= self.gpio.read_value(self.spi_miso)
self.gpio.set_value(self.spi_clk, self.gpio.LOW)
self.gpio.set_value(self.spi_cs, self.gpio.HIGH)
return response
self.spi.transfer(command, bits = 11)
def set_b(self, value):
command = (((value & 0x1FF)) << 2) + 1
command = self._revbits(command)
self.spi.transfer(command, bits = 11)
if __name__ == '__main__':
gpio = GPIO()
gpio.set_output(TRIG_SEL0)
gpio.set_output(TRIG_SEL1)
gpio.set_output(REF_SEL)
gpio.set_input(COMP_OUT)
gpio.set_input(REFCLK)
delay = Delay(gpio)
dac = Dac(gpio)
NDELAYS = 1 << 9
NDACS = 1 << 12
BRUTE_FORCE_TRIG = False
# trigger sources:
# 0 - clk (delayed)
# 1 - unused
# 2 - analog trigger
# 3 - external pulse