diff --git a/examples/keybrd_shift_register/keybrd_shift_register.ino b/examples/keybrd_shift_register/keybrd_shift_register.ino
index 438e760..d001391 100644
--- a/examples/keybrd_shift_register/keybrd_shift_register.ino
+++ b/examples/keybrd_shift_register/keybrd_shift_register.ino
@@ -126,7 +126,7 @@ const uint8_t LED_PIN = 16;                     //indicates wait
 //sometimes OS takes 6 seconds to recongnize keyboard, LED blinks from the begining
 void wait()
 {
-    for (uint8_t count = 0; count < 6; count++)
+    for (uint8_t count = 0; count < 7; count++)
     {
         //print count
         Keyboard.print(count);
@@ -144,11 +144,12 @@ void setup()
 {
     pinMode (LED_PIN, OUTPUT);
     Keyboard.begin();
+
+    wait();
     SPI.begin();
     row_R0.begin();
     row_R1.begin();
 
-    wait();
     Keyboard.print(F("keybrd_shift_reg.ino "));
     debug.print_free_RAM();
 }
diff --git a/src/RowScanner_SPIShiftRegisters.cpp b/src/RowScanner_SPIShiftRegisters.cpp
index 4b2c57c..00a6d6a 100644
--- a/src/RowScanner_SPIShiftRegisters.cpp
+++ b/src/RowScanner_SPIShiftRegisters.cpp
@@ -1,12 +1,17 @@
 #include "RowScanner_SPIShiftRegisters.h"
 
+//constructor
+RowScanner_SPIShiftRegisters::RowScanner_SPIShiftRegisters(const uint8_t STROBE_PIN, uint8_t KEY_COUNT)
+    : STROBE_PIN(STROBE_PIN), ROW_END(1 << KEY_COUNT), BYTE_COUNT(ceil (float(KEY_COUNT)/8))
+{
+    //configure controller to communicate with shift register matrix
+    pinMode(STROBE_PIN, OUTPUT);
+    pinMode(SHIFT_LOAD, OUTPUT);
+}
+
 void RowScanner_SPIShiftRegisters::begin()
 {
-    //configure row
-    pinMode(STROBE_PIN, OUTPUT);
-
     //initialize shift register's shift/load pin
-    pinMode(SHIFT_LOAD, OUTPUT);
     digitalWrite(SHIFT_LOAD, HIGH);
 }
 
@@ -29,7 +34,8 @@ read_pins_t RowScanner_SPIShiftRegisters::scan(read_pins_mask_t& rowEnd)
     //strobe row off
     digitalWrite(STROBE_PIN, LOW);
 
-    rowEnd = 1 << KEY_COUNT;
+    rowEnd = ROW_END;
+    //rowEnd = 1 << 8;
 
     //clear unpowered pins (for testing bb) todo
     rowState &= 0b01010001000100010001000100010001; //also 31st key
diff --git a/src/RowScanner_SPIShiftRegisters.h b/src/RowScanner_SPIShiftRegisters.h
index cd555f9..2ead3c1 100644
--- a/src/RowScanner_SPIShiftRegisters.h
+++ b/src/RowScanner_SPIShiftRegisters.h
@@ -33,11 +33,10 @@ class RowScanner_SPIShiftRegisters : public RowScannerInterface
         //todo static const bool ACTIVE_HIGH;          //logic level of strobe pin: 0=activeLow, 1=activeHigh
         static const uint8_t SHIFT_LOAD;               //controller's pin number that is connected to shift register's SHIFT_LOAD pin
         const uint8_t STROBE_PIN;               //Arduino pin number connected to this row
-        const uint8_t KEY_COUNT;                //number of keys in row
+        const read_pins_mask_t ROW_END;                //number of keys in row  + 1
         const uint8_t BYTE_COUNT;               //number of bytes to read from shift registers
     public:
-        RowScanner_SPIShiftRegisters(const uint8_t STROBE_PIN, uint8_t KEY_COUNT)
-            : STROBE_PIN(STROBE_PIN), KEY_COUNT(KEY_COUNT), BYTE_COUNT(ceil (float(KEY_COUNT)/8)) {}
+        RowScanner_SPIShiftRegisters(const uint8_t STROBE_PIN, uint8_t KEY_COUNT);
         virtual read_pins_t scan(read_pins_mask_t& rowEnd);
         void begin();
 };