ftdiJtagMPSSE,jtag,jtagInterface: allows to force read/write edge configuration (useful to mimic SPI through JTAG)

src/ftdiJtagMPSSE.hpp

@@ -32,6 +32,31 @@ class FtdiJtagMPSSE : public JtagInterface, public FTDIpp_MPSSE {
 
 	uint32_t getClkFreq() override {return FTDIpp_MPSSE::getClkFreq();}
 
+	/*!
+	 * Return constant to describe if read is on rising or falling TCK edge
+	 */
+	tck_edge_t getReadEdge() {
+		return _read_mode == MPSSE_READ_NEG ? FALLING_EDGE : RISING_EDGE;
+	}
+	/*!
+	 * configure TCK edge used for read
+	 */
+	void setReadEdge(tck_edge_t rd_edge) {
+		_read_mode = rd_edge == FALLING_EDGE ? MPSSE_READ_NEG : 0;
+	}
+	/*!
+	 * Return constant to describe if write is on rising or falling TCK edge
+	 */
+	tck_edge_t getWriteEdge() {
+		return _write_mode == MPSSE_WRITE_NEG ? FALLING_EDGE : RISING_EDGE;
+	}
+	/*!
+	 * configure TCK edge used for write
+	 */
+	void setWriteEdge(tck_edge_t wr_edge) {
+		_write_mode = wr_edge == FALLING_EDGE ? MPSSE_WRITE_NEG : 0;
+	}
+
 	/* TMS */
 	int writeTMS(const uint8_t *tms, uint32_t len, bool flush_buffer) override;
 	/* clock */

src/jtag.hpp

@@ -28,6 +28,27 @@ class Jtag {
 	int setClkFreq(uint32_t clkHZ) { return _jtag->setClkFreq(clkHZ);}
 	uint32_t getClkFreq() { return _jtag->getClkFreq();}
 
+	/*!
+	 * Return constant to describe if read is on rising or falling TCK edge
+	 */
+	JtagInterface::tck_edge_t getReadEdge() { return _jtag->getReadEdge();}
+	/*!
+	 * configure TCK edge used for read
+	 */
+	void setReadEdge(JtagInterface::tck_edge_t rd_edge) {
+		_jtag->setReadEdge(rd_edge);
+	}
+	/*!
+	 * Return constant to describe if write is on rising or falling TCK edge
+	 */
+	JtagInterface::tck_edge_t getWriteEdge() { return _jtag->getWriteEdge();}
+	/*!
+	 * configure TCK edge used for write
+	 */
+	void setWriteEdge(JtagInterface::tck_edge_t wr_edge) {
+		_jtag->setWriteEdge(wr_edge);
+	}
+
 	/*!
 	 * \brief scan JTAG chain to obtain IDCODE. Fill
 	 *        a vector with all idcode and another

src/jtagInterface.hpp

@@ -24,6 +24,29 @@ class JtagInterface {
 	virtual int setClkFreq(uint32_t clkHZ) = 0;
 	virtual uint32_t getClkFreq() {return _clkHZ;}
 
+	enum tck_edge_t {
+		FALLING_EDGE = 0,
+		RISING_EDGE  = 1,
+		NONE_EDGE    = 2,
+	};
+
+	/*!
+	 * Return constant to describe if read is on rising or falling TCK edge
+	 */
+	tck_edge_t getReadEdge() { return NONE_EDGE; }
+	/*!
+	 * configure TCK edge used for read
+	 */
+	void setReadEdge(tck_edge_t rd_edge) { (void) rd_edge; }
+	/*!
+	 * Return constant to describe if write is on rising or falling TCK edge
+	 */
+	tck_edge_t getWriteEdge() { return NONE_EDGE; }
+	/*!
+	 * configure TCK edge used for write
+	 */
+	void setWriteEdge(tck_edge_t wr_edge) { (void)wr_edge; }
+
 	/*!
 	 * \brief flush TMS internal buffer (ie. transmit to converter)
 	 * \param tdo: pointer for read operation. May be NULL