Cocotb UART Modules

Install

From Github

• Clone the repository:

  $ git clone https://github.com/wallento/cocotbext-uart.git
  

• Then install it with pip:

  $ python -m pip install -e cocotbext-uart
  

From pip global

To install it with pip published globally simply use pip install as usual:

$ python -m pip install cocotbext-uart

How to use it

Sending value

Here an example to send data with uart protocol to a DUT module with only input Rx uart pin named RxBit

First, import following

from cocotbext.uart import UARTConfig
from cocotbext.uart import UARTModule
from cocotbext.uart import UARTSignals

Then instanciate the config class, NameTuple signals and the module:

class MyBench(object):
    def __init__(self, dut):
        self._clock = Clock(dut.clk, 20, units="ns") # Create a 50Mhz clock
        self._uart_config = UARTConfig(baud=19200)
        self._uartsig = UARTSignals(tx = dut.RxBit,
                                    rx = dut.RxBit, # loop tx->rx
                                    ctsn = None,
                                    rtsn = None)
        self._uart_drv = UARTModule(config=self._uart_config,
                        signals=self._uartsig,
                        clk=self._clock)

Once all declarations/instanciations done, send a value in test function:

@cocotb.test()
async def test_simple(dut):
    tmb = TestMyBench(dut)
    tmb.log.info("Simple uart test")
    await tmb._uart_drv.send(0x42)
    await Timer(20, units="us")
    tmb.log.info("End of Simple uart test")

Receiving value

TODO