diff --git a/src_main/io/pispi.cpp b/src_main/io/pispi.cpp
index 547966a4..80a9741d 100644
--- a/src_main/io/pispi.cpp
+++ b/src_main/io/pispi.cpp
@@ -24,6 +24,8 @@ PISPI::PISPI(const PIString & path, uint speed, PIIODevice::DeviceMode mode) : P
 	setSpeed(speed);
 	setBits(8);
 	spi_mode = 0;
+	if (mode == ReadOnly)
+		piCoutObj << "error, SPI can't work in ReadOnly mode";
 #ifndef WINDOWS
 	PRIVATE->fd = 0;
 #endif
@@ -111,10 +113,32 @@ int PISPI::writeDevice(const void * data, int max_size) {
 		//piCoutObj << "write" << max_size << tx_buf.size();
 		ret = ioctl(PRIVATE->fd, SPI_IOC_MESSAGE(1), &PRIVATE->spi_ioc_tr);
 		if (ret < 1) {piCoutObj << "can't send spi message" << ret; return -1;}
-		recv_buf.append(rx_buf);
+		if (canRead()) recv_buf.append(rx_buf);
 		if (recv_buf.size_s() > threadedReadBufferSize()) recv_buf.resize(threadedReadBufferSize());
 		return max_size;
 	}
 #endif
 	return 0;
 }
+
+
+PIString PISPI::constructFullPathDevice() const {
+	PIString ret;
+	ret << path() << ":" << int(speed()) << ":" << int(bits()) << ":" << (int)parameters();
+	return ret;
+}
+
+
+void PISPI::configureFromFullPathDevice(const PIString & full_path) {
+	PIStringList pl = full_path.split(":");
+	for (int i = 0; i < pl.size_s(); ++i) {
+		PIString p(pl[i]);
+		switch (i) {
+		case 0: setPath(p); break;
+		case 1: setSpeed(p.toInt()); break;
+		case 2: setBits(p.toInt()); break;
+		case 3: setParameters(p.toInt()); break;
+		default: break;
+		}
+	}
+}
diff --git a/src_main/io/pispi.h b/src_main/io/pispi.h
index 4d5c21f5..fe74881f 100644
--- a/src_main/io/pispi.h
+++ b/src_main/io/pispi.h
@@ -42,6 +42,11 @@ protected:
 	int readDevice(void * read_to, int max_size);
 	int writeDevice(const void * data, int max_size);
 
+	PIString fullPathPrefix() const {return PIStringAscii("spi");}
+	PIString constructFullPathDevice() const;
+	void configureFromFullPathDevice(const PIString & full_path);
+	DeviceInfoFlags deviceInfoFlags() const {return PIIODevice::Sequential;}
+
 private:
 	uint spi_speed;
 	uchar spi_mode;