Fixed rounding error in baud rate calculation

2019-07-28 19:20:03 +02:00 · 2019-07-28 19:20:03 +02:00 · 6ded0e1c8d
commit 6ded0e1c8d
parent 00cb9ad13c
1 changed files with 3 additions and 1 deletions
--- a/hardware0.hpp
+++ b/hardware0.hpp
@ -55,7 +55,9 @@ struct HardwareAbstraction<SupportedHardware::ATmega1284P> {
 	template <uint32_t baudRate>
 	static constexpr auto calcBaud()
 	{
-		return static_cast<uint16_t>((F_CPU / (16 * baudRate)) - 1);
+		// The actual formula is (F_CPU / (16 * baudRate)) - 1, but this one has the advantage of rounding correctly
+		constexpr auto baudVal = (F_CPU + 8 * baudRate) / (16 * baudRate) - 1;
+		return baudVal;
 	}

 	struct DataBitsVal {