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thechaingamer
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ada-git-code

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declare
CR1: Control_Register_1 := USART1.CR1;
begin
CR1.M := Word_8_Bits;
CR1.PCE := False;
CR1.PS := Even_Parity;
CR1.TE := True;
CR1.RE := True;
CR1.OVER8 := False;
USART1.CR1 := CR1;
Function Definition: function Next_Sample_Pulse_And_Noise
Function Body: (Chan : in out Channel;
Sample_Rate : Positive)
return Sample
with Inline;
function Next_Sample_Triangle
(Chan : in out Channel;
Sample_Rate : Positive)
return Sample
with Inline;
procedure Process_Seq (This : in out Instance;
Chan_Id : Channel_ID);
-----------------------
-- Period_In_Samples --
-----------------------
function Period_In_Samples (Sample_Rate : Positive;
Rate_In_Hertz : Frequency)
return Float
is (Float (Sample_Rate) / Float (Rate_In_Hertz))
with Inline;
---------------------------------
-- Next_Sample_Pulse_And_Noise --
---------------------------------
function Next_Sample_Pulse_And_Noise
(Chan : in out Channel;
Sample_Rate : Positive)
return Sample
is
Delta_Time : Float;
Width : Float;
Next_State : BLIT_State := Down;
begin
Chan.CSample_Nb := Chan.CSample_Nb + 1;
-- If it is time, compute the next BLIT step
if Chan.Next_Impulse_Time <= Chan.CSample_Nb then
if Chan.State = Up then
Width := Chan.Width;
else
Width := 1.0 - Chan.Width;
end if;
Delta_Time := Period_In_Samples (Sample_Rate, Chan.Freq) * Width +
Chan.Next_Impulse_Phase;
Chan.Next_Impulse_Time := Chan.Next_Impulse_Time +
Natural (Float'Floor (Delta_Time));
Chan.Next_Impulse_Phase := Delta_Time - Float'Floor (Delta_Time);
case Chan.Mode is
when Pulse =>
-- Invert the state
Next_State := (if Chan.State = Up then Down else Up);
when Noise_1 | Noise_2 =>
-- Next state depends on LFSR noise
declare
B0 : constant Unsigned_16 := Chan.LFSR and 1;
B1 : constant Unsigned_16 := Shift_Right (Chan.LFSR, 1) and 1;
B6 : constant Unsigned_16 := Shift_Right (Chan.LFSR, 6) and 1;
Feedback : Unsigned_16;
begin
if Chan.Mode = Noise_1 then
Feedback := B0 xor B1;
else
Feedback := B0 xor B6;
end if;
Next_State := (if B0 = 0 then Down else Up);
Chan.LFSR := Shift_Right (Chan.LFSR, 1);
if (Feedback and 1) /= 0 then
Chan.LFSR := Chan.LFSR or 16#4000#;
else
Chan.LFSR := Chan.LFSR and not 16#4000#;
end if;