Livt.IO

tests/spi/SPITransactionsSlowContextTest.lvt

namespace Livt.IO.Tests

using Livt.IO

/**
 * Verifies scheduled transaction completion against the physical master state machine.
 */
@Test
@Context(ClockFrequency = 25MHz)
component SPITransactionsSlowContextTest
{
	// Owned bus and scheduled master adapter.
	bus: SPITransactionsLoopback
	transactions: SPITransactions

	/**
	 * Constructs a loopback in the inherited 25 MHz context.
	 */
	new()
	{
		bus = new SPITransactionsLoopback()
		transactions = new SPITransactions(bus, 200ns)
	}

	/**
	 * Consecutive bytes share chip select and return exact full-duplex data.
	 */
	@Test
	fn ExchangesBytesUnderOneSelection()
	{
		transactions.Select()
		assert bus.chip_select_n == 0b0
		assert transactions.Transfer(0xA5) == 0xA5
		assert transactions.Transfer(0x3C) == 0x3C
		transactions.Deselect()
		assert bus.chip_select_n == 0b1
		transactions.Select()
		assert transactions.Transfer(0x81) == 0x81
		transactions.Deselect()
		assert bus.chip_select_n == 0b1
	}
}