112 lines
2.4 KiB
Ada
112 lines
2.4 KiB
Ada
with STM32.F429Z; use STM32.F429Z;
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use STM32.F429Z.Modules.GPIO;
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use STM32.F429Z.Modules.USART;
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use STM32.F429Z.Modules.RCC;
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with Ada.Real_Time; use Ada.Real_Time;
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procedure UART_429Disco is
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UART_Port: GPIO_Registers renames GPIOA;
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UART_TX_Bit: constant Port_Bit_Number := 9;
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UART_RX_Bit: constant Port_Bit_Number := 10;
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UART_Module: USART_Registers renames USART1;
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procedure UART_Transmit(Data : String) is
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begin
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for I of Data loop
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while not UART_Module.SR.TXE loop
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null;
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end loop;
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UART_Module.DR := Character'Pos(I);
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end loop;
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end;
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APB2_Frequency : constant := 90_000_000; -- Set by board support
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Baud_Rate : constant := 115_200;
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Ratio : constant := (APB2_Frequency + Baud_Rate / 2) / Baud_Rate;
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Period: constant Time_Span := Milliseconds(100);
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Now: Time := Clock;
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begin
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RCC.AHB1ENR.GPIOA := True;
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RCC.APB2ENR.USART1 := True;
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RCC.APB2RSTR.USART1 := True;
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RCC.APB2RSTR.USART1 := False;
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UART_Port.AFR(UART_TX_Bit) := Alternate_Functions.USART1;
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UART_Port.MODER(UART_TX_Bit) := Alternate_Mode;
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UART_Port.OSPEEDR(UART_TX_Bit) := Low_Speed;
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UART_Port.OTYPER(UART_TX_Bit) := Push_Pull_Type;
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UART_Port.PUPDR(UART_TX_Bit) := Pull_Down;
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UART_Port.AFR(UART_RX_Bit) := Alternate_Functions.USART1;
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UART_Port.MODER(UART_RX_Bit) := Alternate_Mode;
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UART_Port.OSPEEDR(UART_RX_Bit) := Low_Speed;
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UART_Port.OTYPER(UART_RX_Bit) := Push_Pull_Type;
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UART_Port.PUPDR(UART_RX_Bit) := Pull_Down;
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declare
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R : Control_Register_1 := UART_Module.CR1;
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begin
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R.UE := False;
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UART_Module.CR1 := R;
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end;
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declare
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R : Control_Register_1 := UART_Module.CR1;
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begin
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R.M := Word_8_Bits;
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R.PCE := False;
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R.PS := Even_Parity;
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R.TE := True;
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R.RE := True;
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R.OVER8 := False;
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UART_Module.CR1 := R;
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end;
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declare
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R : Control_Register_2 := UART_Module.CR2;
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begin
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R.STOP := Stop_1_Bit;
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R.LINEN := False;
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R.CLKEN := False;
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UART_Module.CR2 := R;
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end;
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declare
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R : Control_Register_3 := UART_Module.CR3;
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begin
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R.SCEN := False;
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R.HDSEL := False;
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R.IREN := False;
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R.RTSE := False;
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R.CTSE := False;
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UART_Module.CR3 := R;
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end;
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UART_Module.BRR := (DIV_Mantissa => Ratio / 16, DIV_Fraction => Ratio mod 16, others => 0);
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declare
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R : Control_Register_1 := UART_Module.CR1;
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begin
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R.UE := True;
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UART_Module.CR1 := R;
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end;
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loop
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UART_Transmit("Hello World! ... ");
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Now := Now + Period;
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delay until Now;
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end loop;
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end UART_429Disco; |