diff --git a/README.md b/README.md
index 34d0fb4..6ad5302 100644
--- a/README.md
+++ b/README.md
@@ -60,7 +60,7 @@ openFPGALoader -- a program to flash FPGA
                             of positive
       --vid arg             probe Vendor ID
       --pid arg             probe Product ID
-      --cable-index arg     probe index
+      --cable-index arg     probe index (FTDI and cmsisDAP)
       --ftdi-serial arg     FTDI chip serial number
       --ftdi-channel arg    FTDI chip channel number (channels 0-3 map to
                             A-D)
diff --git a/src/cmsisDAP.cpp b/src/cmsisDAP.cpp
index 4078e05..7900b2d 100644
--- a/src/cmsisDAP.cpp
+++ b/src/cmsisDAP.cpp
@@ -88,7 +88,7 @@ enum cmsisdap_status {
 	DAP_ERROR = 0xff
 };
 
-CmsisDAP::CmsisDAP(int vid, int pid, uint8_t verbose):_verbose(verbose),
+CmsisDAP::CmsisDAP(int vid, int pid, int index, uint8_t verbose):_verbose(verbose),
 		_device_idx(0),  _vid(vid), _pid(pid),
 		_serial_number(L""), _dev(NULL), _num_tms(0), _is_connect(false)
 {
@@ -121,18 +121,36 @@ CmsisDAP::CmsisDAP(int vid, int pid, uint8_t verbose):_verbose(verbose),
 		throw std::runtime_error("No device found");
 	}
 	/* more than one device: can't continue without more information */
-	if (dev_found.size() > 1) {
+	if (dev_found.size() > 1 && index == -1) {
 		hid_exit();
 		throw std::runtime_error(
-				"Error: more than one device. Please provides VID/PID");
+				"Error: more than one device. Please provides VID/PID or cable-index");
+	}
+
+	/* if index check for if interface exist */
+	if (index != -1) {
+		bool found = false;
+		for (size_t i = 0; i < dev_found.size(); i++) {
+			if (dev_found[i]->interface_number == index) {
+				found = true;
+				_device_idx = i;
+				break;
+			}
+		}
+		if (!found) {
+			hid_exit();
+			throw std::runtime_error(
+				"Error: no compatible interface with index " + std::to_string(_device_idx));
+		}
 	}
 
 	printInfo("Found " + std::to_string(dev_found.size()) + " compatible device:");
 	for (size_t i = 0; i < dev_found.size(); i++) {
 		char val[256];
-		snprintf(val, sizeof(val), "\t0x%04x 0x%04x %ls",
+		snprintf(val, sizeof(val), "\t0x%04x 0x%04x 0x%d %ls",
 				dev_found[i]->vendor_id,
 				dev_found[i]->product_id,
+				dev_found[i]->interface_number,
 				dev_found[i]->product_string);
 		printInfo(val);
 	}
diff --git a/src/cmsisDAP.hpp b/src/cmsisDAP.hpp
index d034209..fc8e95b 100644
--- a/src/cmsisDAP.hpp
+++ b/src/cmsisDAP.hpp
@@ -21,9 +21,10 @@ class CmsisDAP: public JtagInterface {
 		 *                    else search for a compatible device
 		 * \param[in] vid: vendor id
 		 * \param[in] pid: product id
+		 * \param[in] index: interface number
 		 * \param[in] verbose: verbose level 0 normal, 1 verbose
 		 */
-		CmsisDAP(const int vid, const int pid, uint8_t verbose);
+		CmsisDAP(const int vid, const int pid, int index, uint8_t verbose);
 
 		~CmsisDAP();
 
diff --git a/src/ftdipp_mpsse.cpp b/src/ftdipp_mpsse.cpp
index c65ec66..e7cd630 100644
--- a/src/ftdipp_mpsse.cpp
+++ b/src/ftdipp_mpsse.cpp
@@ -45,7 +45,10 @@ FTDIpp_MPSSE::FTDIpp_MPSSE(const mpsse_bit_config &cable, const string &dev,
 	} else {
 		_vid = cable.vid;
 		_pid = cable.pid;
-		_index = cable.index;
+		if (cable.index == -1)
+			_index = 0;
+		else
+			_index = cable.index;
 	}
 
 	open_device(serial, 115200);
diff --git a/src/jtag.cpp b/src/jtag.cpp
index a31cf07..914b9c4 100644
--- a/src/jtag.cpp
+++ b/src/jtag.cpp
@@ -120,7 +120,8 @@ void Jtag::init_internal(cable_t &cable, const string &dev, const string &serial
 		break;
 	case MODE_CMSISDAP:
 #ifdef ENABLE_CMSISDAP
-		_jtag = new CmsisDAP(cable.config.vid, cable.config.pid, _verbose);
+		_jtag = new CmsisDAP(cable.config.vid, cable.config.pid,
+				cable.config.index, _verbose);
 		break;
 #else
 		std::cerr << "Jtag: support for cmsisdap was not enabled at compile time" << std::endl;
diff --git a/src/main.cpp b/src/main.cpp
index b153215..155396b 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -67,7 +67,7 @@ struct arguments {
 	int16_t altsetting;
 	uint16_t vid;
 	uint16_t pid;
-	uint16_t cable_index;
+	int16_t cable_index;
 	string ip_adr;
 	uint32_t protect_flash;
 	bool unprotect_flash;
@@ -98,7 +98,7 @@ int main(int argc, char **argv)
 	/* command line args. */
 	struct arguments args = {0, false, false, false, 0, "", "", "-", "", -1,
 			0, false, "-", false, false, false, false, Device::PRG_NONE, false,
-			false, false, "", "", "", -1, 0, false, -1, 0, 0, 0, "127.0.0.1",
+			false, false, "", "", "", -1, 0, false, -1, 0, 0, -1, "127.0.0.1",
 			0, false, "", false, false,
 			/* xvc server */
 			false, 3721, "-",
@@ -652,7 +652,7 @@ int parse_opt(int argc, char **argv, struct arguments *args, jtag_pins_conf_t *p
 				cxxopts::value<bool>(args->invert_read_edge))
 			("vid", "probe Vendor ID", cxxopts::value<uint16_t>(args->vid))
 			("pid", "probe Product ID", cxxopts::value<uint16_t>(args->pid))
-			("cable-index", "probe index", cxxopts::value<uint16_t>(args->cable_index))
+			("cable-index", "probe index (FTDI and cmsisDAP)", cxxopts::value<int16_t>(args->cable_index))
 
 			("ftdi-serial", "FTDI chip serial number", cxxopts::value<string>(args->ftdi_serial))
 			("ftdi-channel", "FTDI chip channel number (channels 0-3 map to A-D)", cxxopts::value<int>(args->ftdi_channel))