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184 | ------------------------------------------------------------------------------
-- --
-- Copyright © AdaCore and other contributors, 2017-2020 --
-- See https://github.com/AdaCore/Ada_Drivers_Library/graphs/contributors --
-- for more information --
-- --
-- Redistribution and use in source and binary forms, with or without --
-- modification, are permitted provided that the following conditions are --
-- met: --
-- 1. Redistributions of source code must retain the above copyright --
-- notice, this list of conditions and the following disclaimer. --
-- 2. Redistributions in binary form must reproduce the above copyright --
-- notice, this list of conditions and the following disclaimer in --
-- the documentation and/or other materials provided with the --
-- distribution. --
-- 3. Neither the name of the copyright holder nor the names of its --
-- contributors may be used to endorse or promote products derived --
-- from this software without specific prior written permission. --
-- --
-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS --
-- "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT --
-- LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR --
-- A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT --
-- HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, --
-- SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT --
-- LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, --
-- DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY --
-- THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT --
-- (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE --
-- OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. --
-- --
------------------------------------------------------------------------------
with NRF_SVD.SAADC; use NRF_SVD.SAADC;
with nRF.Tasks; use nRF.Tasks;
with System.Storage_Elements;
package body nRF.ADC is
procedure Set_Resolution (Res : Bits_Resolution);
procedure Set_Reference (Ref : Reference_Selection);
procedure Wait_For_Result;
--------------------
-- Set_Resolution --
--------------------
procedure Set_Resolution (Res : Bits_Resolution) is
begin
SAADC_Periph.RESOLUTION.VAL :=
(case Res is
when Res_8bit => Val_8BIT,
when Res_10bit => Val_10BIT,
when Res_12bit => Val_12BIT);
end Set_Resolution;
-------------------
-- Set_Reference --
-------------------
procedure Set_Reference (Ref : Reference_Selection) is
begin
case Ref is
when Internal_0V6 =>
SAADC_Periph.CH (0).CONFIG.REFSEL := Internal;
when VDD_One_Forth =>
SAADC_Periph.CH (0).CONFIG.REFSEL := Vdd1_4;
end case;
end Set_Reference;
--------------------------
-- Start_Pin_Conversion --
--------------------------
function Do_Pin_Conversion
(Pin : Analog_Pin;
Input : Pin_Input_Selection;
Ref : Reference_Selection;
Res : Bits_Resolution) return UInt16
is
Result : UInt16 with Volatile;
begin
Set_Resolution (Res);
Set_Reference (Ref);
SAADC_Periph.RESULT.PTR := UInt32 (System.Storage_Elements.To_Integer (Result'Address));
SAADC_Periph.RESULT.MAXCNT.MAXCNT := 1;
case Input is
when Pin_Quadruple =>
SAADC_Periph.CH (0).CONFIG.GAIN := Gain4;
when Pin_Double =>
SAADC_Periph.CH (0).CONFIG.GAIN := Gain2;
when Pin_Full =>
SAADC_Periph.CH (0).CONFIG.GAIN := Gain1;
when Pin_Half =>
SAADC_Periph.CH (0).CONFIG.GAIN := Gain1_2;
when Pin_One_Third =>
SAADC_Periph.CH (0).CONFIG.GAIN := Gain1_3;
when Pin_One_Forth =>
SAADC_Periph.CH (0).CONFIG.GAIN := Gain1_4;
when Pin_One_Fifth =>
SAADC_Periph.CH (0).CONFIG.GAIN := Gain1_5;
when Pin_One_Sixth =>
SAADC_Periph.CH (0).CONFIG.GAIN := Gain1_6;
end case;
case Pin is
when 0 =>
SAADC_Periph.CH (0).PSELP.PSELP := Analoginput0;
when 1 =>
SAADC_Periph.CH (0).PSELP.PSELP := Analoginput1;
when 2 =>
SAADC_Periph.CH (0).PSELP.PSELP := Analoginput2;
when 3 =>
SAADC_Periph.CH (0).PSELP.PSELP := Analoginput3;
when 4 =>
SAADC_Periph.CH (0).PSELP.PSELP := Analoginput4;
when 5 =>
SAADC_Periph.CH (0).PSELP.PSELP := Analoginput5;
when 6 =>
SAADC_Periph.CH (0).PSELP.PSELP := Analoginput6;
when 7 =>
SAADC_Periph.CH (0).PSELP.PSELP := Analoginput7;
end case;
SAADC_Periph.ENABLE.ENABLE := Enabled;
Trigger (ADC_START);
Wait_For_Result;
return Result;
end Do_Pin_Conversion;
--------------------------
-- Start_VDD_Conversion --
--------------------------
function Do_VDD_Conversion
(Input : VDD_Input_Selection;
Ref : Reference_Selection;
Res : Bits_Resolution) return UInt16
is
Result : UInt16 with Volatile;
begin
Set_Resolution (Res);
Set_Reference (Ref);
SAADC_Periph.CH (0).PSELP.PSELP := Vdd;
SAADC_Periph.RESULT.PTR := UInt32 (System.Storage_Elements.To_Integer (Result'Address));
SAADC_Periph.RESULT.MAXCNT.MAXCNT := 1;
case Input is
when VDD_One_Fifth =>
SAADC_Periph.CH (0).CONFIG.GAIN := Gain1_5;
when VDD_One_Sixth =>
SAADC_Periph.CH (0).CONFIG.GAIN := Gain1_6;
end case;
SAADC_Periph.ENABLE.ENABLE := Enabled;
Trigger (ADC_START);
Wait_For_Result;
return Result;
end Do_VDD_Conversion;
----------
-- Busy --
----------
function Busy return Boolean
is (SAADC_Periph.STATUS.STATUS = Busy);
---------------------
-- Wait_For_Result --
---------------------
procedure Wait_For_Result is
begin
while Busy loop
null;
end loop;
SAADC_Periph.ENABLE.ENABLE := Enabled;
end Wait_For_Result;
end nRF.ADC;
|