98 lines
2.8 KiB
Python
98 lines
2.8 KiB
Python
# XXX Adapt test to new architecture
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class UARTTB(Module):
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def __init__(self):
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self.clk_freq = 83333333
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self.baud = 3000000
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self.pads = Record([("rx", 1), ("tx", 1)])
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self.submodules.slave = UART(self.pads, self.clk_freq, self.baud)
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def wait_for(self, ns_time):
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freq_in_ghz = self.clk_freq/(10**9)
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period = 1/freq_in_ghz
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num_loops = int(ns_time/period)
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for i in range(num_loops+1):
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yield
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def gen_simulation(self, selfp):
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baud_in_ghz = self.baud/(10**9)
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uart_period = int(1/baud_in_ghz)
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half_uart_period = int(1/(2*baud_in_ghz))
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# Set TX an RX lines idle
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selfp.pads.tx = 1
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selfp.pads.rx = 1
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yield
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# First send a few characters
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tx_string = "01234"
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print("Sending string: " + tx_string)
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for c in tx_string:
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selfp.slave._r_rxtx.r = ord(c)
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selfp.slave._r_rxtx.re = 1
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yield
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selfp.slave._r_rxtx.re = 0
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yield from self.wait_for(half_uart_period)
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if selfp.pads.tx:
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print("FAILURE: no start bit sent")
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val = 0
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for i in range(8):
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yield from self.wait_for(uart_period)
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val >>= 1
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if selfp.pads.tx:
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val |= 0x80
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yield from self.wait_for(uart_period)
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if selfp.pads.tx == 0:
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print("FAILURE: no stop bit sent")
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if ord(c) != val:
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print("FAILURE: sent decimal value "+str(val)+" (char "+chr(val)+") instead of "+c)
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else:
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print("SUCCESS: sent "+c)
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while selfp.slave.ev.tx.trigger != 1:
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yield
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# Then receive a character
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rx_string = '5'
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print("Receiving character "+rx_string)
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rx_value = ord(rx_string)
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for i in range(11):
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if (i == 0):
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# start bit
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selfp.pads.rx = 0
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elif (i == 9):
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# stop bit
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selfp.pads.rx = 1
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elif (i == 10):
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selfp.pads.rx = 1
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break
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else:
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selfp.pads.rx = 1 if (rx_value & 1) else 0
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rx_value >>= 1
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yield from self.wait_for(uart_period)
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rx_value = ord(rx_string)
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received_value = selfp.slave._r_rxtx.w
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if (received_value == rx_value):
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print("RX SUCCESS: ")
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else:
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print("RX FAILURE: ")
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print("received "+chr(received_value))
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while True:
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yield
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if __name__ == "__main__":
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from migen.sim.generic import Simulator, TopLevel
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from migen.sim import icarus
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with Simulator(UARTTB(), TopLevel("top.vcd", clk_period=int(1/0.08333333)),
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icarus.Runner(keep_files=False)) as s:
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s.run(20000)
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