Add SPI settings

src/spi_settings.cpp

@@ -0,0 +1,72 @@
+#include <sta/spi_settings.hpp>
+
+#include <sta/assert.hpp>
+#include <sta/lang.hpp>
+
+
+namespace sta
+{
+	SpiClkPolarity getSpiClkPolarity(SpiMode mode)
+	{
+		switch (mode)
+		{
+		case SpiMode::MODE_0:
+		case SpiMode::MODE_1:
+			return SpiClkPolarity::LOW;
+
+		case SpiMode::MODE_2:
+		case SpiMode::MODE_3:
+			return SpiClkPolarity::HIGH;
+
+		default:
+			// Unreachable case
+			STA_ASSERT_MSG(false, "Case for SpiMode enum not handled");
+			STA_UNREACHABLE();
+		}
+	}
+
+	SpiClkPhase getSpiClkPhase(SpiMode mode)
+	{
+		switch (mode)
+		{
+		case SpiMode::MODE_0:
+		case SpiMode::MODE_2:
+			return SpiClkPhase::EDGE_1;
+
+		case SpiMode::MODE_1:
+		case SpiMode::MODE_3:
+			return SpiClkPhase::EDGE_2;
+
+		default:
+			// Unreachable case
+			STA_ASSERT_MSG(false, "Case for SpiMode enum not handled");
+			STA_UNREACHABLE();
+		}
+	}
+
+	SpiMode getSpiMode(SpiClkPolarity polarity, SpiClkPhase phase)
+	{
+		if (polarity == SpiClkPolarity::LOW)
+		{
+			if (phase == SpiClkPhase::EDGE_1)
+			{
+				return SpiMode::MODE_0;
+			}
+			else
+			{
+				return SpiMode::MODE_1;
+			}
+		}
+		else
+		{
+			if (phase == SpiClkPhase::EDGE_1)
+			{
+				return SpiMode::MODE_2;
+			}
+			else
+			{
+				return SpiMode::MODE_3;
+			}
+		}
+	}
+} // namespace sta