wiring digital speed optimization

Уменьшено время выполнения функций digitalRead/Write/Toggle для всех плат

cores/arduino/mik32/hal/peripherals/Include/mik32_hal_gpio.h

@@ -36,6 +36,7 @@ extern "C" {
  */
 typedef enum __HAL_PinsTypeDef
 {
+	NOT_A_PIN  = (0 << 0),	 /**< Не выбран пин. */
 	GPIO_PIN_0 = (1 << 0),	 /**< Выбран пин 0. */
 	GPIO_PIN_1 = (1 << 1),	 /**< Выбран пин 1. */
 	GPIO_PIN_2 = (1 << 2),	 /**< Выбран пин 2. */

cores/arduino/wiring_digital.c

@@ -95,7 +95,7 @@ void fastPinMode(uint32_t PinNumber, uint32_t PinMode)
 }
 
 // write pin
-void digitalWrite(uint32_t PinNumber, uint32_t Val)
+__attribute__((noinline, section(".ram_text"))) void digitalWrite(uint32_t PinNumber, uint32_t Val)
 {
   if ((PinNumber>=pinCommonQty()))
   {
@@ -103,42 +103,46 @@ void digitalWrite(uint32_t PinNumber, uint32_t Val)
     return;
   }
   
-  if (digitalPinHasPWM(PinNumber))
+  if (digitalPinPwmIsOn(PinNumber))
     // if the pin can use PWM, disable PWM
     analogWriteStop(PinNumber);
 
-  HAL_GPIO_WritePin(digitalPinToPort(PinNumber), digitalPinToBitMask(PinNumber), (Val == HIGH) ? GPIO_PIN_HIGH : GPIO_PIN_LOW);
+  if (Val == HIGH)
+    GPIO_SET_PIN(digitalPinToPort(PinNumber), digitalPinToBitMask(PinNumber));
+  else
+    GPIO_CLEAR_PIN(digitalPinToPort(PinNumber), digitalPinToBitMask(PinNumber));
 }
 
 // read pin
-int digitalRead(uint32_t PinNumber)
+__attribute__((noinline, section(".ram_text"))) int digitalRead(uint32_t PinNumber)
 { 
   if ((PinNumber>=pinCommonQty()))
   {
     ErrorMsgHandler("digitalRead(): pin number exceeds the total number of pins");
     return -1;
   }
-  if (digitalPinHasPWM(PinNumber))
+
+  if (digitalPinPwmIsOn(PinNumber))
     // if the pin can use PWM, disable PWM
     analogWriteStop(PinNumber);
 
-  GPIO_PinState pinState = HAL_GPIO_ReadPin(digitalPinToPort(PinNumber), digitalPinToBitMask(PinNumber));
+  return GPIO_READ_PIN(digitalPinToPort(PinNumber), digitalPinToBitMask(PinNumber));
-  return (pinState == GPIO_PIN_LOW) ? LOW : HIGH;
 }
 
 // toggle pin
-void digitalToggle(uint32_t PinNumber)
+__attribute__((noinline, section(".ram_text"))) void digitalToggle(uint32_t PinNumber)
 {
   if ((PinNumber>=pinCommonQty()))
   {
     ErrorMsgHandler("digitalToggle(): pin number exceeds the total number of pins");
     return;
   }
-  if (digitalPinHasPWM(PinNumber))
+
+  if (digitalPinPwmIsOn(PinNumber))
     // if the pin can use PWM, disable PWM
     analogWriteStop(PinNumber);
 
-  HAL_GPIO_TogglePin(digitalPinToPort(PinNumber), digitalPinToBitMask(PinNumber));
+  GPIO_TOGGLE_PIN(digitalPinToPort(PinNumber), digitalPinToBitMask(PinNumber));
 }
 
 #ifdef __cplusplus

libraries/NeoPixel/src/NeoPixel.cpp

@@ -65,7 +65,7 @@ static void __attribute__((noinline, section(".ram_text"))) mik32Show(GPIO_TypeD
   // not support 400khz
   if (!is800KHz) return;
   
-  if ((m_port != NULL) && (m_pin != NC))
+  if ((m_port != NULL) && (m_pin != NOT_A_PIN))
   {
     volatile uint32_t* set = &m_port->SET;
     volatile uint32_t* clr = &m_port->CLEAR;

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);
+static inline __attribute__((always_inline)) bool digitalPinHasPWM(uint8_t p)   
-bool digitalPinPwmIsOn(uint8_t digitalPin); // use only if digitalPinHasPWM() == true
+{
+  // 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

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 GPIO_0;   
-
-  return gpioNum;
 }
 
 // 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 digitalPinToGpioPinArray[digPinNumber];
-  return mask;
-}
-
-uint16_t pinCommonQty(void)
-{
-  return (uint16_t)(sizeof(digitalPinToGpioPinArray)/sizeof(digitalPinToGpioPinArray[0]));
 }
 
 // the function returns a reference to the OUTPUT address of the GPIO register
@@ -219,31 +209,22 @@ uint32_t analogInputToChannelNumber(uint32_t PinNumber)
 
 // use only if digitalPinHasPWM() == true
 // return true if digitalPin configured as pwm
-bool digitalPinPwmIsOn(uint8_t digitalPin)
+__attribute__((noinline, section(".ram_text"))) bool digitalPinPwmIsOn(uint8_t digitalPin)
 {
-  uint8_t config = 0;
+  if (digitalPinHasPWM(digitalPin))
-  uint8_t pinShift = PIN_MASK_TO_PIN_NUMBER(digitalPinToBitMask(digitalPin));
+  {
+    uint8_t config = 0;
+    uint8_t pinShift = PIN_MASK_TO_PIN_NUMBER(digitalPinToBitMask(digitalPin));
 
-  if (PWM_PIN_TO_PORT_NUMBER(digitalPin) == 0)
+    if (PWM_PIN_TO_PORT_NUMBER(digitalPin) == 0)
-    config = PIN_GET_PAD_CONFIG(PORT_0_CFG, pinShift);
+      config = PIN_GET_PAD_CONFIG(PORT_0_CFG, pinShift);
-  else 
+    else 
-    config = PIN_GET_PAD_CONFIG(PORT_1_CFG, pinShift);
+      config = PIN_GET_PAD_CONFIG(PORT_1_CFG, pinShift);
 
-  if (config == 2)
+    if (config == 2)
-    return true;
+      return true;
-  else
+  }
-    return false;
+  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;
 }
 
 // function is used only if digitalPinHasPWM() is true

variants/elbear_ace_uno/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   24
+#define pinCommonQty()    (PINS_COMMON_QTY)
+
+extern bool spi0NssPinIsBlocked;
+extern bool spi1NssPinIsBlocked;
+
 // analog pins
 #define PIN_A0        (14)
 #define PIN_A1        (15)
@@ -47,7 +54,6 @@ static const uint8_t A3 = PIN_A3;
 static const uint8_t A4 = PIN_A4;
 static const uint8_t A5 = PIN_A5;
 
-
 // digital pins
 // D0...D13, D18, D19
 
@@ -55,12 +61,10 @@ static const uint8_t A5 = PIN_A5;
 #define LED_BUILTIN   (22)
 #define BTN_BUILTIN   (23)
 
-// determines the address of the port by the board pin number to which this pin belongs on the MCU
+// determines the port address by the board pin number to which this pin belongs on the MCU
 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
@@ -80,8 +84,15 @@ uint32_t analogInputToChannelNumber(uint32_t PinNumber);
 
 // PWM
 #define PWM_FREQUENCY_MAX         1000000 // Hz
-bool digitalPinHasPWM(uint8_t p);
+static inline __attribute__((always_inline)) bool digitalPinHasPWM(uint8_t p)   
-bool digitalPinPwmIsOn(uint8_t digitalPin); // use only if digitalPinHasPWM() == true
+{
+  // 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

variants/elbear_ace_uno/variant.c

@@ -34,7 +34,7 @@ bool spi0NssPinIsBlocked = false;
 bool spi1NssPinIsBlocked = false;
 
 // list of pin numbers from both ports with pins inside the port
-const HAL_PinsTypeDef digitalPinToGpioPinArray[] =
+const HAL_PinsTypeDef digitalPinToGpioPinArray[PINS_COMMON_QTY] =
 {
   GPIO_PIN_5, // D0
   GPIO_PIN_6, // D1
@@ -62,10 +62,9 @@ const HAL_PinsTypeDef digitalPinToGpioPinArray[] =
   GPIO_PIN_6  // BTN(pin 23) 
 };
 
-// etermines the address of the port by the board pin number to which this pin belongs on the MCU
+// 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");
@@ -74,41 +73,32 @@ GPIO_TypeDef* digitalPinToPort(uint32_t digPinNumber)
 
   // port 2 - led and button
   if (digPinNumber == LED_BUILTIN || digPinNumber == BTN_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)) // 10 pieces
-    gpioNum = GPIO_1;
+    return GPIO_1;
   // port 0 - board pins 0...6, 9, 16(A2), 17(A3), 20(A4), 21(A5)
   else
-    gpioNum = GPIO_0;
+    return GPIO_0;
-
-  return gpioNum;
 } 
 
 // 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 digitalPinToGpioPinArray[digPinNumber];
-  return mask;
-}
-
-uint16_t pinCommonQty(void)
-{
-  return (uint16_t)(sizeof(digitalPinToGpioPinArray)/sizeof(digitalPinToGpioPinArray[0]));
 }
 
 // the function returns a reference to the OUTPUT address of the GPIO register
@@ -180,33 +170,23 @@ uint32_t analogInputToChannelNumber(uint32_t PinNumber)
 // use only if digitalPinHasPWM() == true
 #define PWM_PIN_TO_PORT_NUMBER(pin)   (((pin==10)||(pin==11)||(pin==12)||(pin==13)) ? 1:0)
 
-// use only if digitalPinHasPWM() == true
 // return true if digitalPin configured as pwm
-bool digitalPinPwmIsOn(uint8_t digitalPin)
+__attribute__((noinline, section(".ram_text"))) bool digitalPinPwmIsOn(uint8_t digitalPin)
 {
-  uint8_t config = 0;
+  if (digitalPinHasPWM(digitalPin))
-  uint8_t pinShift = PIN_MASK_TO_PIN_NUMBER(digitalPinToBitMask(digitalPin));
+  {
+    uint8_t config = 0;
+    uint8_t pinShift = PIN_MASK_TO_PIN_NUMBER(digitalPinToBitMask(digitalPin));
 
-  if (PWM_PIN_TO_PORT_NUMBER(digitalPin) == 0)
+    if (PWM_PIN_TO_PORT_NUMBER(digitalPin) == 0)
-    config = PIN_GET_PAD_CONFIG(PORT_0_CFG, pinShift);
+      config = PIN_GET_PAD_CONFIG(PORT_0_CFG, pinShift);
-  else 
+    else 
-    config = PIN_GET_PAD_CONFIG(PORT_1_CFG, pinShift);
+      config = PIN_GET_PAD_CONFIG(PORT_1_CFG, pinShift);
 
-  if (config == 2)
+    if (config == 2)
-    return true;
+      return true;
-  else
+  }
-    return false;
+  return false;
-}
-
-bool digitalPinHasPWM(uint8_t p)   
-{
-  bool ret = false;
-  // if spi is in use D9 or 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;
 }
 
 // function is used only if digitalPinHasPWM() is true

variants/elsomik/pins_arduino.h

@@ -71,6 +71,8 @@ typedef enum
   P2_7,             // 33
   PINS_COMMON_QTY,  // 34
 } DigitalPinsTypeDef;
+// total number of pins available for initialization
+#define pinCommonQty()    (PINS_COMMON_QTY)
 
 // analog pins
 #define PIN_A0        (P1_5)
@@ -96,11 +98,6 @@ 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 digitalPinNumber);
-// total number of pins available for initialization
-static inline uint16_t pinCommonQty(void)
-{
-  return (uint16_t)PINS_COMMON_QTY;
-}
 // 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
@@ -120,8 +117,12 @@ uint32_t analogInputToChannelNumber(uint32_t PinNumber);
 
 // PWM
 #define PWM_FREQUENCY_MAX         1000000 // Hz
-bool digitalPinHasPWM(uint8_t p);
+static inline __attribute__((always_inline)) bool digitalPinHasPWM(uint8_t p)
-bool digitalPinPwmIsOn(uint8_t digitalPin); // use only if digitalPinHasPWM() == true
+{
+  return (p <= P1_15) && ((p & 0xF) < 4);
+}
+// 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

variants/elsomik/variant.c

@@ -21,7 +21,7 @@
  * @return The address of the port corresponding to the board pin number. Can return 0 if the pin not exists
  */
 
-GPIO_TypeDef *digitalPinToPort(uint32_t digitalPinNumber)
+ __attribute__((noinline, section(".ram_text"))) GPIO_TypeDef *digitalPinToPort(uint32_t digitalPinNumber)
 {
   if (digitalPinNumber >= pinCommonQty())
   {
@@ -40,12 +40,12 @@ GPIO_TypeDef *digitalPinToPort(uint32_t digitalPinNumber)
 }
 
 // determines the pin address inside the port by the board pin number
-HAL_PinsTypeDef digitalPinToBitMask(uint32_t digitalPinNumber)
+__attribute__((noinline, section(".ram_text"))) HAL_PinsTypeDef digitalPinToBitMask(uint32_t digitalPinNumber)
 {
   if (digitalPinNumber >= PINS_COMMON_QTY)
   {
     ErrorMsgHandler("digitalPinToBitMask(): pin number exceeds the total number of pins");
-    return NC;
+    return NOT_A_PIN;
   }
 
   if (digitalPinNumber >= P2_6)
@@ -110,27 +110,24 @@ uint32_t analogInputToChannelNumber(uint32_t PinNumber)
 
 // use only if digitalPinHasPWM() == true
 // return true if digitalPin configured as pwm
-bool digitalPinPwmIsOn(uint8_t digitalPin)
+__attribute__((noinline, section(".ram_text"))) bool digitalPinPwmIsOn(uint8_t digitalPin)
 {
-  uint8_t config = 0;
+  if (digitalPinHasPWM(digitalPin))
-  uint8_t pinShift = digitalPin & 0x3;
+  {
+    uint8_t config = 0;
+    uint8_t pinShift = digitalPin & 0x3;
 
-  if (PWM_PIN_TO_PORT_NUMBER(digitalPin) == 0)
+    if (PWM_PIN_TO_PORT_NUMBER(digitalPin) == 0)
-    config = PIN_GET_PAD_CONFIG(PORT_0_CFG, pinShift);
+      config = PIN_GET_PAD_CONFIG(PORT_0_CFG, pinShift);
-  else
+    else
-    config = PIN_GET_PAD_CONFIG(PORT_1_CFG, pinShift);
+      config = PIN_GET_PAD_CONFIG(PORT_1_CFG, pinShift);
 
-  if (config == 2)
+    if (config == 2)
-    return true;
+      return true;
-  else
+  }
     return false;
 }
 
-bool digitalPinHasPWM(uint8_t digitalPin)
-{
-  return (digitalPin <= P1_15) && ((digitalPin & 0xF) < 4);
-}
-
 // function is used only if digitalPinHasPWM() is true
 TIMER32_TypeDef *pwmPinToTimer(uint32_t digPinNumber)
 {

variants/start/pins_arduino.h

@@ -78,6 +78,9 @@ typedef enum
   PINS_COMMON_QTY,  // 40
 } DigitalPinsTypeDef;
 
+// total number of pins available for initialization
+#define pinCommonQty()    (PINS_COMMON_QTY)
+
 // analog pins
 #define PIN_A0        (P1_5)
 #define PIN_A1        (P1_7)
@@ -108,11 +111,6 @@ 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 digitalPinNumber);
-// total number of pins available for initialization
-static inline uint16_t pinCommonQty(void)
-{
-  return (uint16_t)PINS_COMMON_QTY;
-}
 // 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
@@ -132,8 +130,12 @@ uint32_t analogInputToChannelNumber(uint32_t PinNumber);
 
 // PWM
 #define PWM_FREQUENCY_MAX         1000000 // Hz
-bool digitalPinHasPWM(uint8_t p);
+static inline __attribute__((always_inline)) bool digitalPinHasPWM(uint8_t p)
-bool digitalPinPwmIsOn(uint8_t digitalPin); // use only if digitalPinHasPWM() == true
+{
+  return (p < 32) && ((p & 0xF) < 4);
+}
+// 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

variants/start/variant.c

@@ -21,7 +21,7 @@
  * @return The address of the port corresponding to the board pin number. Can return 0 if the pin not exists
  */
 
-GPIO_TypeDef *digitalPinToPort(uint32_t digitalPinNumber)
+ __attribute__((noinline, section(".ram_text"))) GPIO_TypeDef *digitalPinToPort(uint32_t digitalPinNumber)
 {
   GPIO_TypeDef* port = NULL;
   if (digitalPinNumber < pinCommonQty())
@@ -39,12 +39,12 @@ GPIO_TypeDef *digitalPinToPort(uint32_t digitalPinNumber)
 }
 
 // determines the pin address inside the port by the board pin number
-HAL_PinsTypeDef digitalPinToBitMask(uint32_t digitalPinNumber)
+__attribute__((noinline, section(".ram_text"))) HAL_PinsTypeDef digitalPinToBitMask(uint32_t digitalPinNumber)
 {
   if (digitalPinNumber >= pinCommonQty())
   {
     ErrorMsgHandler("digitalPinToBitMask(): pin number exceeds the total number of pins");
-    return NC;
+    return NOT_A_PIN;
   }
 
   return (HAL_PinsTypeDef)(1 << (digitalPinNumber & 0xF));
@@ -106,27 +106,24 @@ uint32_t analogInputToChannelNumber(uint32_t PinNumber)
 
 // use only if digitalPinHasPWM() == true
 // return true if digitalPin configured as pwm
-bool digitalPinPwmIsOn(uint8_t digitalPin)
+__attribute__((noinline, section(".ram_text"))) bool digitalPinPwmIsOn(uint8_t digitalPin)
 {
-  uint8_t config = 0;
+  if (digitalPinHasPWM(digitalPin))
-  uint8_t pinShift = digitalPin & 3;
+  {
+    uint8_t config = 0;
+    uint8_t pinShift = digitalPin & 3;
 
-  if (PWM_PIN_TO_PORT_NUMBER(digitalPin) == 0)
+    if (PWM_PIN_TO_PORT_NUMBER(digitalPin) == 0)
-    config = PIN_GET_PAD_CONFIG(PORT_0_CFG, pinShift);
+      config = PIN_GET_PAD_CONFIG(PORT_0_CFG, pinShift);
-  else
+    else
-    config = PIN_GET_PAD_CONFIG(PORT_1_CFG, pinShift);
+      config = PIN_GET_PAD_CONFIG(PORT_1_CFG, pinShift);
 
-  if (config == 2)
+    if (config == 2)
-    return true;
+      return true;
-  else
+  }
     return false;
 }
 
-bool digitalPinHasPWM(uint8_t p)
-{
-  return (p < 32) && ((p & 0xF) < 4);
-}
-
 // function is used only if digitalPinHasPWM() is true
 TIMER32_TypeDef *pwmPinToTimer(uint32_t digPinNumber)
 {