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feat: add readbytedata method #89

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feat: add readbytedata method #89

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6 changes: 6 additions & 0 deletions lib/i2c.coffee
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Original file line number Diff line number Diff line change
Expand Up @@ -78,6 +78,12 @@ class i2c extends EventEmitter
tick ->
callback err, data

readByteData: (position, callback) ->
@setAddress @address
wire.readByteData position, (err, data) ->
tick ->
callback err, data

readBytes: (cmd, len, callback) ->
@setAddress @address
wire.readBlock cmd, len, null, (err, actualBuffer) ->
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28 changes: 28 additions & 0 deletions src/i2c.cc
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Expand Up @@ -148,6 +148,32 @@ void ReadByte(const Nan::FunctionCallbackInfo<v8::Value>& info) {
info.GetReturnValue().Set(data);
}

void ReadByteData(const Nan::FunctionCallbackInfo<v8::Value>& info) {
Nan::HandleScope scope;

Local<Value> data;
Local<Value> err = Nan::New<Value>(Nan::Null());

int32_t position = info[0]->Int32Value();

int32_t res = i2c_smbus_read_byte_data(fd, position);

if (res == -1) {
err = Nan::Error(Nan::New("Cannot read device").ToLocalChecked());
} else {
data = Nan::New<Integer>(res);
}

if (info[1]->IsFunction()) {
const unsigned argc = 2;
Local<Function> callback = Local<Function>::Cast(info[1]);
Local<Value> argv[argc] = { err, data };
Nan::MakeCallback(Nan::GetCurrentContext()->Global(), callback, argc, argv);
}

info.GetReturnValue().Set(data);
}

void ReadBlock(const Nan::FunctionCallbackInfo<v8::Value>& info) {
Nan::HandleScope scope;

Expand Down Expand Up @@ -287,6 +313,8 @@ void Init(Handle<Object> exports) {
Nan::New<v8::FunctionTemplate>(Read)->GetFunction());
exports->Set(Nan::New("readByte").ToLocalChecked(),
Nan::New<v8::FunctionTemplate>(ReadByte)->GetFunction());
exports->Set(Nan::New("readByteData").ToLocalChecked(),
Nan::New<v8::FunctionTemplate>(ReadByteData)->GetFunction());
exports->Set(Nan::New("readBlock").ToLocalChecked(),
Nan::New<v8::FunctionTemplate>(ReadBlock)->GetFunction());

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