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254 | ---------------------------------------------------------------------------
-- The AVR-Ada Library is free software; you can redistribute it and/or --
-- modify it under terms of the GNU General Public License as published --
-- by the Free Software Foundation; either version 2, or (at your --
-- option) any later version. The AVR-Ada Library is distributed in the --
-- hope that it will be useful, but WITHOUT ANY WARRANTY; without even --
-- the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR --
-- PURPOSE. See the GNU General Public License for more details. --
-- --
-- As a special exception, if other files instantiate generics from this --
-- unit, or you link this unit with other files to produce an --
-- executable this unit does not by itself cause the resulting --
-- executable to be covered by the GNU General Public License. This --
-- exception does not however invalidate any other reasons why the --
-- executable file might be covered by the GNU Public License. --
---------------------------------------------------------------------------
-- for now this is a simple minded implementation of the Put and Get
-- routines that transport a Word or an array. See Atmel note AVR100
-- for explanation and sample assembler routines for accessing the
-- internal EEPROMs.
with System; use System;
with Ada.Unchecked_Conversion;
with AVR.Interrupts;
with AVR.MCU;
use AVR;
package body AVR.EEprom is
#if Eeprom_WE = "eeprom_we" then
EE_Master_Write_Enable : Boolean renames MCU.EECR_Bits (MCU.EEMWE_Bit);
EE_Write_Enable : Boolean renames MCU.EECR_Bits (MCU.EEWE_Bit);
#else
EE_Master_Write_Enable : Boolean renames MCU.EECR_Bits (MCU.EEMPE_Bit);
EE_Write_Enable : Boolean renames MCU.EECR_Bits (MCU.EEPE_Bit);
#end if;
EE_Read_Enable : Boolean renames MCU.EECR_Bits (MCU.EERE_Bit);
-- indicate, if EEprom is ready for a new read/write operation
function Is_Ready return Boolean;
-- loops until EEprom is no longer busy
procedure Busy_Wait;
function Is_Ready return Boolean is
begin
return (EE_Write_Enable = Low);
end Is_Ready;
procedure Busy_Wait is
begin
while not Is_Ready loop
null;
end loop;
end Busy_Wait;
procedure Put (Address : EEprom_Address; Data : Unsigned_8) is
use AVR.MCU;
S_Reg : Unsigned_8;
begin
while not Is_Ready loop null; end loop;
#if Eeprom_Width = "eeprom_16bit" then
EEARH := High_Byte (Unsigned_16 (Address));
EEARL := Low_Byte (Unsigned_16 (Address));
#else
EEAR := Unsigned_8 (Address);
#end if;
EEDR := Data;
-- no ints between setting EEMWE and EEWE
S_Reg := AVR.Interrupts.Save_And_Disable;
EE_Master_Write_Enable := True;
EE_Write_Enable := True;
AVR.Interrupts.Restore (S_Reg);
end Put;
procedure Put_Char (Address : EEprom_Address; Data : Character) is
begin
Put (Address, Unsigned_8(Character'Pos (Data)));
end Put_Char;
pragma Inline_Always (Put_Char);
procedure Put (Address : EEprom_Address; Data : Character)
renames Put_Char;
procedure Put (Address : EEprom_Address; Data : Unsigned_16) is
begin
Put (Address, AVR.Low_Byte (Data));
Put (Address + 1, AVR.High_Byte (Data));
end Put;
procedure Put (Address : EEprom_Address; Data : Unsigned_32) is
Bytes : Nat8_Array(1..4);
for Bytes'Address use Data'Address;
begin
Put (Address, Bytes);
end Put;
procedure Put (Address : EEprom_Address; Data : Nat8_Array) is
Local : EEprom_Address := Address;
begin
for J in Data'Range loop
Put (Local, Data (J));
Local := Local + 1;
end loop;
end Put;
function Get (Address : EEprom_Address) return Unsigned_8 is
use AVR.MCU;
begin
Busy_Wait;
#if Eeprom_Width = "eeprom_16bit" then
EEARH := High_Byte (Unsigned_16 (Address));
EEARL := Low_Byte (Unsigned_16 (Address));
#else
EEAR := Unsigned_8 (Address);
#end if;
EE_Read_Enable := True;
return EEDR;
end Get;
function Get (Address : EEprom_Address) return Character is
U : Unsigned_8;
begin
U := Get (Address);
return Character'Val(U);
end Get;
function Get (Address : EEprom_Address) return Unsigned_16 is
Low : Unsigned_8;
High : Unsigned_8;
begin
Low := Get (Address);
High := Get (Address+1);
return Unsigned_16 (High) * 256 + Unsigned_16 (Low);
end Get;
function Get (Address : EEprom_Address) return Unsigned_32
is
Result : Unsigned_32;
Bytes : Nat8_Array (1..4);
for Bytes'Address use Result'Address;
begin
Get (Address, Bytes);
return Result;
end Get;
procedure Get (Address : EEprom_Address; Data : out Nat8_Array) is
Local : EEprom_Address := Address;
begin
for I in Data'Range loop
Data (I) := Get (Local);
Local := Local + 1;
end loop;
end Get;
-- procedure Generic_Get (Address : EEprom_Address; Data : out T)
-- is
-- Size_Bits : constant := T'Size;
-- Size : constant := Size_Bits / 8;
-- Rounded : constant Boolean := (Data'Size = (Data'Size/8) * 8);
-- Bytes : Nat8_Array (1 .. Data'Size/8);
-- for Bytes'Address use Data'Address;
-- Local : EEprom_Address := Address;
-- begin
-- for I in Bytes'Range loop
-- Bytes(I) := Get(Local);
-- Local := Local + 1;
-- end loop;
-- end Generic_Get;
function "+" is new Ada.Unchecked_Conversion (Source => Integer_32,
Target => Unsigned_32);
function "+" is new Ada.Unchecked_Conversion (Source => Integer_16,
Target => Unsigned_16);
function "+" is new Ada.Unchecked_Conversion (Source => Integer_8,
Target => Unsigned_8);
procedure Put (Address : EEprom_Address; Data : Integer_8) is
U : constant Unsigned_8 := +Data;
begin
Put (Address, U);
end Put;
procedure Put (Address : EEprom_Address; Data : Integer_16) is
U : constant Unsigned_16 := +Data;
begin
Put (Address, U);
end Put;
procedure Put (Address : EEprom_Address; Data : Integer_32) is
U : constant Unsigned_32 := +Data;
begin
Put (Address, U);
end Put;
function "+" is new Ada.Unchecked_Conversion (Source => Unsigned_32,
Target => Integer_32);
function "+" is new Ada.Unchecked_Conversion (Source => Unsigned_16,
Target => Integer_16);
function "+" is new Ada.Unchecked_Conversion (Source => Unsigned_8,
Target => Integer_8);
function Get (Address : EEprom_Address) return Integer_8
is
U : constant Unsigned_8 := Get (Address);
begin
return +U;
end Get;
function Get (Address : EEprom_Address) return Integer_16
is
U : constant Unsigned_16 := Get (Address);
begin
return +U;
end Get;
function Get (Address : EEprom_Address) return Integer_32
is
U : constant Unsigned_32 := Get (Address);
begin
return +U;
end Get;
end AVR.EEprom;
-- Local Variables:
-- mode:ada
-- End:
|