91 lines
2.3 KiB
Python
91 lines
2.3 KiB
Python
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from nmigen.build import *
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__all__ = ["I2CResource", "GPIOResources", "DiffResources"]
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def I2CResource(*args, sda, scl, conn=None, attrs=None, role="host"):
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assert role in ("host", "device")
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io = []
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# sda line: I/O port for the data line
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io.append(Subsignal("sda", Pins(sda, dir="io", conn=conn, assert_width=1)))
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# sck line: I2C clock signal outputs from master to slave
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if role == "host":
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io.append(Subsignal("scl", Pins(scl, dir="o", conn=conn, assert_width=1)))
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else: #device
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io.append(Subsignal("scl", Pins(scl, dir="i", conn=conn, assert_width=1)))
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if attrs is not None:
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io.append(attrs)
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return Resource.family(*args, default_name="i2c", ios=io)
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# Auto create a resource list given a set of iCE40 pins and STM32 pin names (pins_dict)
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def GPIOResources(*args, pins_dict, dir = "o", invert=False, conn=None, attrs=None):
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# Check data integrity: pins_dict must be a dict AND port must be from a to k
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assert isinstance(pins_dict, dict)
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# Debug: dir == "o"
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assert dir == "o"
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# List of resources to be returned
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resources = []
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for STM32_pin, iCE40_pin in pins_dict.items():
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# Set all gpio pins to be output only for the time being
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# TODO: Allow dir argument.
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ios = [Pins(iCE40_pin, dir=dir, invert=invert, conn=conn)]
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if attrs is not None:
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ios.append(attrs)
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# Extract GPIO port and port number from STM32_pin
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# Strip "P" from P<port><port_num>
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if STM32_pin.startswith('P'):
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STM32_pin = STM32_pin[1:]
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# Acquire port from <port><port_num>
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port = STM32_pin[0].lower()
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port_num = int(STM32_pin[1:])
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# Insert gpio<port>.<portNum> into resources list
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resources.append(Resource.family(*args, port_num, default_name=("gpio"+port), ios=ios))
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return resources
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# Auto create a resource list for differential I/O
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def DiffResources(*args, eem_pins, invert=False, conn=None, attrs=None, dir):
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# TODO: Everything
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# assert dimensionality
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assert isinstance(eem_pins, list)
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assert isinstance(eem_pins[0], list)
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assert isinstance(eem_pins[0][0], list)
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assert isinstance(eem_pins[0][0][0], str)
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# assert direction to be either input or output
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# reject tristate or bidirectional pin
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assert dir in ("i", "o")
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if __name__ == "__main__":
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from pin_mapper import *
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eem = diffMapping()
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DiffResources(eem_pins = eem, dir = "o",
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attrs=Attrs(IO_STANDARD="SB_LVCMOS")
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)
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