diff --git a/variants/start/pins_arduino.h b/variants/start/pins_arduino.h
index 5eb768b..4669d9f 100644
--- a/variants/start/pins_arduino.h
+++ b/variants/start/pins_arduino.h
@@ -97,9 +97,9 @@ static const uint8_t A7 = PIN_A7;
 
 
 // User led and button
-#define LED_BUILTIN   (P0_3)
-#define LED_BUILTIN0   (P0_3)
-#define LED_BUILTIN1   (P1_3)
+#define LED_BUILTIN0  (P0_3)
+#define LED_BUILTIN1  (P1_3)
+#define LED_BUILTIN   LED_BUILTIN0
 #define BTN_BUILTIN   (P0_8)
 
 // determines the address of the port by the board pin number to which this pin belongs on the MCU
@@ -141,10 +141,9 @@ static const uint8_t SS   = PIN_SPI_SS;
 static const uint8_t MOSI = PIN_SPI_MOSI;
 static const uint8_t MISO = PIN_SPI_MISO;
 static const uint8_t SCK  = PIN_SPI_SCK;
-// config SEL_NSS1 to replace D10 to different controller pin,
-// because pin 1.3 which is D10 by default is needed to spi 
-void spi_onBegin(void);
-void spi_onEnd(void);
+// functions is needed for compatibility with other boards
+static inline void spi_onBegin(void) {}
+static inline void spi_onEnd(void) {}
 
 // I2C
 #define PIN_WIRE_SDA  (P1_12)
@@ -158,7 +157,7 @@ static const uint8_t SCL = PIN_WIRE_SCL;
 #define WIRE_FREQ_1000K   1000000
 
 // interrupts
-#define EXTERNAL_INTERRUPTS_QTY   7
+#define EXTERNAL_INTERRUPTS_QTY   8
 extern uint8_t interruptInfo[EXTERNAL_INTERRUPTS_QTY][3];
 // determines the board pin number by interrupt number
 #define interruptToDigitalPin(interruptNum)   (interruptInfo[interruptNum][0])
diff --git a/variants/start/variant.c b/variants/start/variant.c
index 805758b..242ea93 100644
--- a/variants/start/variant.c
+++ b/variants/start/variant.c
@@ -164,7 +164,7 @@ HAL_TIMER32_CHANNEL_IndexTypeDef pwmPinToTimerChannel(uint32_t digPinNumber)
   case 3:
     return TIMER32_CHANNEL_3;
   default:
-    return NULL;
+    return 255;
   }
 }
 
@@ -173,13 +173,14 @@ HAL_TIMER32_CHANNEL_IndexTypeDef pwmPinToTimerChannel(uint32_t digPinNumber)
 // index = interrupt number. In each row {digitalPinNumber, IntLineValue, IntMuxValue}
 uint8_t interruptInfo[EXTERNAL_INTERRUPTS_QTY][3] =
 {
-  {2, GPIO_LINE_2, GPIO_MUX_LINE_2_PORT0_10},          // INT0
-  {3, GPIO_LINE_0, GPIO_MUX_LINE_0_PORT0_0},           // INT1
-  {4, GPIO_LINE_4, GPIO_MUX_LINE_4_PORT0_8},           // INT2
-  {5, GPIO_LINE_1, GPIO_MUX_LINE_1_PORT0_1},           // INT3
-  {8, GPIO_LINE_5, GPIO_MUX_LINE_5_PORT1_9},           // INT4
-  {9, GPIO_LINE_3, GPIO_MUX_LINE_3_PORT0_3},           // INT5
-  {BTN_BUILTIN, GPIO_LINE_6, GPIO_MUX_LINE_6_PORT2_6}, // INT6 (button) // todo кнопка на этом пине??
+  {BTN_BUILTIN, GPIO_LINE_0, GPIO_MUX_LINE_0_PORT0_8},  // INT0
+  {P0_9,        GPIO_LINE_1, GPIO_MUX_LINE_1_PORT0_9},  // INT1
+  {P0_10,       GPIO_LINE_2, GPIO_MUX_LINE_2_PORT0_10}, // INT2
+  {P0_11,       GPIO_LINE_3, GPIO_MUX_LINE_3_PORT0_11}, // INT3
+  {P0_12,       GPIO_LINE_4, GPIO_MUX_LINE_4_PORT0_12}, // INT4
+  {P0_13,       GPIO_LINE_5, GPIO_MUX_LINE_5_PORT0_13}, // INT5
+  {P0_14,       GPIO_LINE_6, GPIO_MUX_LINE_6_PORT0_14}, // INT6
+  {P0_15,       GPIO_LINE_7, GPIO_MUX_LINE_7_PORT0_15}, // INT7
 };
 
 int8_t digitalPinToGpioIntMux(uint8_t digPinNumber)
@@ -219,15 +220,4 @@ int8_t digitalPinToInterrupt(uint32_t digPinNumber)
       return i;
   }
   return NOT_AN_INTERRUPT;
-}
-
-// ---------------------- SPI ---------------------- //
-void spi_onBegin(void)
-{
-  return;
-}
-
-void spi_onEnd(void)
-{
-  return;
 }
\ No newline at end of file