diff --git a/variants/elbear_ace_nano/pins_arduino.h b/variants/elbear_ace_nano/pins_arduino.h
index 54cbc1e..c1e19df 100644
--- a/variants/elbear_ace_nano/pins_arduino.h
+++ b/variants/elbear_ace_nano/pins_arduino.h
@@ -32,6 +32,13 @@ extern "C" {
 #include "mik32_hal_gpio.h"
 #include "mik32_hal_timer32.h"
 
+// total number of pins available for initialization
+#define PINS_COMMON_QTY   26
+#define pinCommonQty()    (PINS_COMMON_QTY)
+
+extern bool spi0NssPinIsBlocked;
+extern bool spi1NssPinIsBlocked;
+
 // analog pins
 #define PIN_A0        (14)
 #define PIN_A1        (15)
@@ -63,8 +70,6 @@ static const uint8_t A7 = PIN_A7;
 GPIO_TypeDef* digitalPinToPort(uint32_t digPinNumber);     
 // determines the pin address inside the port by the board pin number
 HAL_PinsTypeDef digitalPinToBitMask(uint32_t digPinNumber);
-// total number of pins available for initialization
-uint16_t pinCommonQty(void);
 // the function returns a reference to the OUTPUT address of the GPIO register
 volatile uint32_t* portOutputRegister(GPIO_TypeDef* GPIO_x);
 // the function returns a reference to the STATE address of the GPIO register
@@ -84,8 +89,15 @@ uint32_t analogInputToChannelNumber(uint32_t PinNumber);
 
 // PWM
 #define PWM_FREQUENCY_MAX         1000000 // Hz
-bool digitalPinHasPWM(uint8_t p);
-bool digitalPinPwmIsOn(uint8_t digitalPin); // use only if digitalPinHasPWM() == true
+static inline __attribute__((always_inline)) bool digitalPinHasPWM(uint8_t p)   
+{
+  // if spi is in use D9 or D10 cannot work as pwm
+  if (p == 3 || p == 5 || p == 6 || (p >= 11 && p <= 13) || ((p == 9) && !spi0NssPinIsBlocked) || ((p == 10) && !spi1NssPinIsBlocked))
+    return true;
+  return false;
+}
+// return true if digitalPin configured as pwm
+bool digitalPinPwmIsOn(uint8_t digitalPin);
 // determines which timer the pin belongs to
 TIMER32_TypeDef* pwmPinToTimer(uint32_t digPinNumber);
 // determines which timer channel the pin belongs to
diff --git a/variants/elbear_ace_nano/variant.c b/variants/elbear_ace_nano/variant.c
index 7f1d016..cb70338 100644
--- a/variants/elbear_ace_nano/variant.c
+++ b/variants/elbear_ace_nano/variant.c
@@ -65,9 +65,8 @@ const HAL_PinsTypeDef digitalPinToGpioPinArray[] =
 };
 
 // determines the address of the port by the board pin number to which this pin belongs on the MCU
-GPIO_TypeDef* digitalPinToPort(uint32_t digPinNumber)
+__attribute__((noinline, section(".ram_text"))) GPIO_TypeDef* digitalPinToPort(uint32_t digPinNumber)
 {
-  GPIO_TypeDef* gpioNum = NULL;
   if (digPinNumber >= pinCommonQty())
   {
     ErrorMsgHandler("digitalPinToPort(): pin number exceeds the total number of pins");
@@ -76,41 +75,32 @@ GPIO_TypeDef* digitalPinToPort(uint32_t digPinNumber)
 
   // port 2 - led (22)
   if (digPinNumber == LED_BUILTIN)
-    gpioNum = GPIO_2;
+    return GPIO_2;
   // port 1 - board pins 7, 8, 10...13, 14(А0), 15(А1), 18,19
   else if (digPinNumber == 7 || digPinNumber == 8 || (digPinNumber >= 10 && digPinNumber <= 15) 
           || digPinNumber == 18 || digPinNumber == 19 || (digPinNumber == 9 && spi0NssPinIsBlocked))
-    gpioNum = GPIO_1;
+    return GPIO_1;
   // port 0 - board pins 0...6, 9, 16(A2), 17(A3), 20(A4), 21(A5), 24(A6), 25(A7)
   else
-    gpioNum = GPIO_0;   
-
-  return gpioNum;
+    return GPIO_0;   
 }
 
 // determines the pin address inside the port by the board pin number
-HAL_PinsTypeDef digitalPinToBitMask(uint32_t digPinNumber)
+__attribute__((noinline, section(".ram_text"))) HAL_PinsTypeDef digitalPinToBitMask(uint32_t digPinNumber)
 {
   if (digPinNumber >= pinCommonQty())
   {
     ErrorMsgHandler("digitalPinToBitMask(): pin number exceeds the total number of pins");
-    return NC;
+    return NOT_A_PIN;
   }
   
-  HAL_PinsTypeDef mask;
   // if spi is on default pin NSS_IN is needed for spi, board pin is replaced to pin NSS_OUT
   if ((digPinNumber == 10) && spi1NssPinIsBlocked)
-    mask = SPI1_NSS_OUT_PIN;
+    return SPI1_NSS_OUT_PIN;
   else if ((digPinNumber == 9) && spi0NssPinIsBlocked)
-    mask = SPI0_NSS_OUT_PIN;
+    return SPI0_NSS_OUT_PIN;
   else 
-    mask = digitalPinToGpioPinArray[digPinNumber];
-  return mask;
-}
-
-uint16_t pinCommonQty(void)
-{
-  return (uint16_t)(sizeof(digitalPinToGpioPinArray)/sizeof(digitalPinToGpioPinArray[0]));
+    return digitalPinToGpioPinArray[digPinNumber];
 }
 
 // the function returns a reference to the OUTPUT address of the GPIO register
@@ -221,29 +211,20 @@ uint32_t analogInputToChannelNumber(uint32_t PinNumber)
 // return true if digitalPin configured as pwm
 bool digitalPinPwmIsOn(uint8_t digitalPin)
 {
-  uint8_t config = 0;
-  uint8_t pinShift = PIN_MASK_TO_PIN_NUMBER(digitalPinToBitMask(digitalPin));
+  if (digitalPinHasPWM(digitalPin))
+  {
+    uint8_t config = 0;
+    uint8_t pinShift = PIN_MASK_TO_PIN_NUMBER(digitalPinToBitMask(digitalPin));
 
-  if (PWM_PIN_TO_PORT_NUMBER(digitalPin) == 0)
-    config = PIN_GET_PAD_CONFIG(PORT_0_CFG, pinShift);
-  else 
-    config = PIN_GET_PAD_CONFIG(PORT_1_CFG, pinShift);
+    if (PWM_PIN_TO_PORT_NUMBER(digitalPin) == 0)
+      config = PIN_GET_PAD_CONFIG(PORT_0_CFG, pinShift);
+    else 
+      config = PIN_GET_PAD_CONFIG(PORT_1_CFG, pinShift);
 
-  if (config == 2)
-    return true;
-  else
-    return false;
-}
-
-bool digitalPinHasPWM(uint8_t p)   
-{
-  bool ret = false;
-  // if spi is in use D10 cannot work as pwm
-  if (((p == 9) && spi0NssPinIsBlocked) || ((p == 10) && spi1NssPinIsBlocked))
-    ret = false;
-  else if (p == 3 || p == 5 || p == 6 || (p >= 9 && p <= 13))
-    ret = true;
-  return ret;
+    if (config == 2)
+      return true;
+  }
+  return false;
 }
 
 // function is used only if digitalPinHasPWM() is true