diff --git a/pigpio.c b/pigpio.c
index 3fc6402..68dab59 100644
--- a/pigpio.c
+++ b/pigpio.c
@@ -10651,7 +10651,12 @@ int bscXfer(bsc_xfer_t *xfer)
          active = 1;
       }
 
-      myGpioSleep(0, 200);
+      if (!active)
+      {
+         active = bscsReg[BSC_FR] & (BSC_FR_RXBUSY | BSC_FR_TXBUSY);
+      }
+
+      if (active) myGpioSleep(0, 20);
    }
 
    bscFR = bscsReg[BSC_FR] & 0xffff;
diff --git a/pigpio.h b/pigpio.h
index 11ee4b9..dd6d2f8 100644
--- a/pigpio.h
+++ b/pigpio.h
@@ -31,7 +31,7 @@ For more information, please refer to <http://unlicense.org/>
 #include <stdint.h>
 #include <pthread.h>
 
-#define PIGPIO_VERSION 6702
+#define PIGPIO_VERSION 6703
 
 /*TEXT
 
@@ -496,7 +496,7 @@ typedef struct
 
 /* BSC FIFO size */
 
-#define BSC_FIFO_SIZE 16
+#define BSC_FIFO_SIZE 512
 
 typedef struct
 {