Eccelerators.Cli

tests/CliUartIntegrationTest.lvt

namespace Eccelerators.Cli.Tests

using Eccelerators.Cli
using Livt.IO

/**
 * Verifies byte handoff and backpressure against the Livt.IO buffered UART API.
 */
@Test
@Context(ClockFrequency=100MHz)
component CliUartIntegrationTest
{
	// CLI output remains owned here until the UART accepts it.
	cli: CompactCli
	uart: BufferedUart<3, 3, UartDataBits.Eight, UartParity.None, UartStopBits.One, 1MHz>

	// Serial loopback and synchronous launch gating make FIFO rejection deterministic.
	line: logic
	permission: bool

	/**
	 * Connects the UART output to its input with launch permission initially blocked.
	 */
	new()
	{
		this.cli = new CompactCli()
		this.uart = new BufferedUart<3, 3, UartDataBits.Eight, UartParity.None,
			UartStopBits.One, 1MHz>(this.line, this.line, this.permission)
	}

	/**
	 * Retains rejected output, then delivers an accepted byte and line terminator.
	 */
	@Test
	fn PreservesOutputUntilAcceptedAndReceivesCompleteLine()
	{
		this.cli.Reset()
		this.cli.DisableEcho()
		assert this.cli.TryWriteByte(0x61)
		assert this.uart.TryTransmit(0x01)
		assert this.uart.TryTransmit(0x02)
		assert this.uart.TryTransmit(0x03)
		var pending = this.cli.PeekOutput()
		var accepted = this.uart.TryTransmit(pending)
		assert !accepted
		assert this.cli.HasOutput()
		assert this.cli.PeekOutput() == 0x61

		this.uart.ClearTransmitBuffer()
		this.permission = true
		accepted = this.uart.TryTransmit(pending)
		assert accepted
		assert this.cli.ConsumeOutput()
		assert !this.cli.HasOutput()
		assert this.uart.TryTransmit(0x0d)
		Simulation.Wait(3000)

		for (var index = 0; index < 2; index++) {
			assert this.cli.CanAcceptByte()
			var received: byte
			assert this.uart.TryReceive(received)
			assert this.cli.AcceptByte(received)
		}

		assert this.cli.HasLine()
		assert this.cli.GetLineLength() == 1
		assert this.cli.GetLineByte(0) == 0x61
		assert !this.cli.CanAcceptByte()
		assert this.uart.GetReceiveCount() == 0
		assert this.uart.GetFrameErrorCount() == 0
		assert this.uart.GetReceiveOverflowCount() == 0
	}
}