kingst-la2016: comment on FPGA register at offset 0x0004 (unused)

The vendor firmware optionally keeps reading u32 values from the FPGA
register at offset 0x0004 outside of acquisition periods. To present
the input pin's current level and changes "in real time" in the GUI.
The sigrok driver does not use this information, but it's useful to
have the comment in the source code.

diff --git a/src/hardware/kingst-la2016/protocol.c b/src/hardware/kingst-la2016/protocol.c
index e59bae0aab48fbc15386f546fee3839d21a3ce53..2b1da8582f84a3a1e78ec3d1eaaedc87c3532168 100644 (file)
--- a/src/hardware/kingst-la2016/protocol.c
+++ b/src/hardware/kingst-la2016/protocol.c
@@ -79,6 +79,7 @@ static const struct kingst_model models[] = {
 #define REG_RUN                0x00    /* Read capture status, write start capture. */
 #define REG_PWM_EN     0x02    /* User PWM channels on/off. */
 #define REG_CAPT_MODE  0x03    /* Write 0x00 capture to SDRAM, 0x01 streaming. */
+#define REG_PIN_STATE  0x04    /* Read current pin state (real time display). */
 #define REG_BULK       0x08    /* Write start addr, byte count to download samples. */
 #define REG_SAMPLING   0x10    /* Write capture config, read capture SDRAM location. */
 #define REG_TRIGGER    0x20    /* Write level and edge trigger config. */