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* UART example

This commit is contained in:
Vovanium 2021-05-03 22:59:42 +03:00
parent 3085366ca0
commit 33456a114b
1 changed files with 55 additions and 71 deletions
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126
examples/uart/source/uart_429disco.adb
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@ -10,117 +10,101 @@ procedure UART_429Disco is
UART_TX_Bit: constant Port_Bit_Number := 9;
UART_RX_Bit: constant Port_Bit_Number := 10;
UART_Module: USART_Registers renames USART1;
procedure UART_Transmit(Data : String) is
begin
for I of Data loop
while not UART_Module.SR.TXE loop
null;
end loop;
UART_Module.DR := Character'Pos(I);
end loop;
end;
APB2_Frequency : constant := 90_000_000; -- Set by board support
Baud_Rate : constant := 115_200;
Ratio : constant := (APB2_Frequency + Baud_Rate / 2) / Baud_Rate;
--Ratio : constant := 128;
Period: constant Time_Span := Milliseconds(10);
Period: constant Time_Span := Milliseconds(100);
Now: Time := Clock;
begin
-- clock test
--RCC.CFGR.HPRE := AHB_Prescaler_1;
--RCC.CFGR.PPRE2 := APB_Prescaler_2;
RCC.AHB1ENR.GPIOC := True;
RCC.CFGR.MCO2PRE := MCO_Prescaler_5;
RCC.CFGR.MCO2 := Clock_Output_2_SYSCLK;
GPIOC.OTYPER(9) := Push_Pull_Type;
GPIOC.OSPEEDR(9) := Very_High_Speed;
GPIOC.AFR(9) := Alternate_Functions.SYS;
GPIOC.MODER(9) := Alternate_Mode;
RCC.AHB1ENR.GPIOA := True;
RCC.APB2ENR.USART1 := True;
RCC.APB2RSTR.USART1 := True;
RCC.APB2RSTR.USART1 := False;
--
UART_Port.OTYPER(UART_TX_Bit) := Push_Pull_Type;
UART_Port.OSPEEDR(UART_TX_Bit) := Very_High_Speed;
UART_Port.PUPDR(UART_TX_Bit) := Pull_Down;
UART_Port.AFR(UART_TX_Bit) := Alternate_Functions.USART1;
UART_Port.MODER(UART_TX_Bit) := Alternate_Mode;
UART_Port.OSPEEDR(UART_TX_Bit) := Low_Speed;
UART_Port.OTYPER(UART_TX_Bit) := Push_Pull_Type;
UART_Port.PUPDR(UART_TX_Bit) := Pull_Down;
UART_Port.OTYPER(UART_RX_Bit) := Push_Pull_Type;
UART_Port.OSPEEDR(UART_RX_Bit) := Very_High_Speed;
UART_Port.PUPDR(UART_RX_Bit) := No_Pull;
UART_Port.AFR(UART_RX_Bit) := Alternate_Functions.USART1;
UART_Port.MODER(UART_RX_Bit) := Alternate_Mode;
-- UART initialisation (close to ST's HAL)
USART1.CR1.UE := False;
UART_Port.OSPEEDR(UART_RX_Bit) := Low_Speed;
UART_Port.OTYPER(UART_RX_Bit) := Push_Pull_Type;
UART_Port.PUPDR(UART_RX_Bit) := Pull_Down;
declare
CR1: Control_Register_1 := USART1.CR1;
R : Control_Register_1 := UART_Module.CR1;
begin
CR1.M := Word_8_Bits;
CR1.PCE := False;
CR1.PS := Even_Parity;
CR1.TE := True;
CR1.RE := True;
CR1.OVER8 := False;
R.UE := False;
UART_Module.CR1 := R;
end;
declare
R : Control_Register_1 := UART_Module.CR1;
begin
R.M := Word_8_Bits;
R.PCE := False;
R.PS := Even_Parity;
R.TE := True;
R.RE := True;
R.OVER8 := False;
USART1.CR1 := CR1;
UART_Module.CR1 := R;
end;
declare
CR3: Control_Register_3 := USART1.CR3;
R : Control_Register_2 := UART_Module.CR2;
begin
CR3.CTSE := False;
CR3.RTSE := False;
USART1.CR3 := CR3;
R.STOP := Stop_1_Bit;
R.LINEN := False;
R.CLKEN := False;
UART_Module.CR2 := R;
end;
declare
BRR: STM32.F429Z.Modules.USART.Baud_Rate_Register := USART1.BRR;
R : Control_Register_3 := UART_Module.CR3;
begin
--USART1.BRR := (DIV_Mantissa: Ratio / 16, DIV_Fraction: Ratio mod 16, others => 0);
BRR.DIV_Mantissa := Ratio / 16;
BRR.DIV_Fraction := Ratio mod 16;
R.SCEN := False;
R.HDSEL := False;
R.IREN := False;
R.RTSE := False;
R.CTSE := False;
USART1.BRR := BRR;
UART_Module.CR3 := R;
end;
UART_Module.BRR := (DIV_Mantissa => Ratio / 16, DIV_Fraction => Ratio mod 16, others => 0);
declare
CR2: Control_Register_2 := USART1.CR2;
R : Control_Register_1 := UART_Module.CR1;
begin
CR2.LINEN := False;
CR2.CLKEN := False;
CR2.STOP := Stop_1_Bit;
USART1.CR2 := CR2;
R.UE := True;
UART_Module.CR1 := R;
end;
declare
CR3: Control_Register_3 := USART1.CR3;
begin
CR3.SCEN := False;
CR3.HDSEL := False;
CR3.IREN := False;
USART1.CR3 := CR3;
end;
--USART1.GTPR.PSC := 1;
USART1.CR1.UE := True;
loop
USART1.DR := 16#40#; --Character'Pos('!');
UART_Transmit("Hello World! ... ");
Now := Now + Period;
delay until Now;
end loop;