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spi-device node module

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michael 2020-02-23 10:00:05 +00:00
parent 1fc88b7218
commit 1532b6aac2
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packages/nodejs/nodejsspidevice.pas Normal file
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{
This file is part of the Pas2JS run time library.
Copyright (c) 2020 by Michael Van Canneyt
NodeJS spi-dev module import.
See the file COPYING.FPC, included in this distribution,
for details about the copyright.
This program 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.
**********************************************************************}
unit nodejsspidevice;
{$mode objfpc}
{$modeswitch externalclass}
interface
uses
JS,NodeJS;
Type
TNJSErrorCallBack = reference to procedure (err : TJSError);
TSPIDeviceMessage = class external name 'Object' (TJSObject)
byteLength : Longint; //- number, 32-bit, the number of bytes to transfer
sendBuffer : TNJSBuffer; // - optional Buffer, transmit data
receiveBuffer : TNJSBuffer; // - optional Buffer, receive data
speedHz : longint; // optional number, 32-bit, override of the device's clock frequency in Hertz
microSecondDelay : smallint; // - optional number, 16-bit, delay after the last bit transfer before optionally deselecting the device before the next transfer, default 0
bitsPerWord : byte; // optional number, 8-bit, override of the device's wordsize
chipSelectChange : Boolean; // - optional boolean, true to deselect device before starting the next transfer, default false
end;
TSPIDeviceMessages = Array of TSPIDeviceMessage;
TNJSCompletionCallBack = reference to procedure (err : TJSError; msg : TSPIDeviceMessage);
TSPIDeviceOptions = class external name 'Object' (TJSObject)
mode : byte;
chipSelectHigh : boolean;
lsbFirst : boolean;
threeWire : boolean;
loopback : boolean;
noChipSelect : boolean;
ready : boolean;
bitsPerWord : boolean;
maxSpeedHz : longint;
end;
TNJSDeviceOptionsCallBack = reference to procedure (err : TJSError; opts : TSPIDeviceOptions);
TNJSSPIDevice = class external name 'Object' (TJSObject)
function transfer(message : TSPIDeviceMessages; callback : TNJSCompletionCallBack) : TNJSSPIDevice;
function transferSync(message : TSPIDeviceMessages) : TNJSSPIDevice;
function getOptions(callback : TNJSDeviceOptionsCallBack) : TNJSSPIDevice;
function getOptionsSync : TSPIDeviceOptions;
function setOptions(aOptions : TSPIDeviceOptions; callback : TNJSErrorCallBack) : TNJSSPIDevice;
function setOptionsSync(aOptions : TSPIDeviceOptions) : TNJSSPIDevice;
procedure close(callback : TNJSErrorCallBack);
procedure closeSync;
end;
TNJSSPIDeviceClass = class of TNJSSPIDevice;
TNSJSSPIdeviceModule = class external name 'Object' (TJSObject)
Public
var
MODE0 : byte;
MODE1 : byte;
MODE2 : byte;
MODE3 : byte;
Public
function open (busNumber, deviceNumber : Byte; CallBack: TNJSErrorCallBack) : TNJSSPIDevice;
function open (busNumber, deviceNumber : Byte; Options : TSPIDeviceOptions; CallBack: TNJSErrorCallBack) : TNJSSPIDevice;
function openSync (busNumber, deviceNumber : Byte; Options : TSPIDeviceOptions) : TNJSSPIDevice;
function openSync (busNumber, deviceNumber : Byte) : TNJSSPIDevice;
end;
var
spi : TNSJSSPIdeviceModule;
implementation
initialization
spi:=TNSJSSPIdeviceModule(require('spi-device'));
end.