*/
volatile uint32_t rx_mux; // called adc_mux in dsp_core_rx.v
+ /*!
+ * \brief Streaming GPIO configuration
+ *
+ * This determines whether the LSBs of I and Q samples come from the DSP
+ * pipeline or from the io_rx GPIO pins. To stream GPIO, one must first
+ * set the GPIO data direction register to have io_rx[15] and/or io_rx[14]
+ * configured as inputs. The GPIO pins will be sampled at the time the
+ * remainder of the DSP sample is strobed into the RX sample FIFO. There
+ * will be a decimation-dependent fixed time offset between the GPIO
+ * sample stream and the associated RF samples.
+ *
+ * 3 2 1
+ * 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
+ * +-------+-------+-------+-------+-------+-------+-------+-------+
+ * | MBZ |Q|I|
+ * +-------+-------+-------+-------+-------+-------+-------+-------+
+ *
+ * I 0=LSB comes from DSP pipeline (default)
+ * 1=LSB comes from io_rx[15]
+ *
+ * Q 0=LSB comes from DSP pipeline (default)
+ * 1=LSB comes from io_rx[14]
+ */
+ volatile uint32_t gpio_stream_enable;
+
} dsp_rx_regs_t;
#define dsp_rx_regs ((dsp_rx_regs_t *) DSP_RX_BASE)