readMulti method
Read multi - mraa_gpio_read_multi
Read the GPIO(s) value. Reads the number of pins provided to the initialiseMulti() functionwhich must have been called before using this method.
Implementation
MraaReturnCode readMulti(MraaGpioContext dev, MraaGpioMultiRead values) {
if (_initialiseMultiPinCount == 0) {
return MraaReturnCode.errorUnspecified;
}
final rawValues = ffi.calloc.allocate<Int32>(_initialiseMultiPinCount);
var intRet = _impl.mraa_gpio_read_multi(dev, rawValues.cast<Int>());
if (intRet == Mraa.generalError) {
intRet = 99; // unspecified
}
final typedValues = rawValues.asTypedList(_initialiseMultiPinCount);
values.values = List<int>.from(typedValues);
ffi.calloc.free(rawValues);
return MraaReturnCode.returnCode(intRet);
}