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+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+#pragma once
+
+#include <Arduino.h>
+
+#ifndef NUM_DIGITAL_PINS
+   // Only in ST's Arduino core (STM32duino, STM32Core)
+   #error "Expected NUM_DIGITAL_PINS not found"
+#endif
+
+/**
+ *  Life gets complicated if you want an easy to use 'M43 I' output (in port/pin order)
+ *  because the variants in this platform do not always define all the I/O port/pins
+ *  that a CPU has.
+ *
+ *  VARIABLES:
+ *     Ard_num - Arduino pin number - defined by the platform. It is used by digitalRead and
+ *               digitalWrite commands and by M42.
+ *             - does not contain port/pin info
+ *             - is not in port/pin order
+ *             - typically a variant will only assign Ard_num to port/pins that are actually used
+ *     Index - M43 counter - only used to get Ard_num
+ *     x - a parameter/argument used to search the pin_array to try to find a signal name
+ *         associated with a Ard_num
+ *     Port_pin - port number and pin number for use with CPU registers and printing reports
+ *
+ *  Since M43 uses digitalRead and digitalWrite commands, only the Port_pins with an Ard_num
+ *  are accessed and/or displayed.
+ *
+ *  Three arrays are used.
+ *
+ *  digitalPin[] is provided by the platform.  It consists of the Port_pin numbers in
+ *  Arduino pin number order.
+ *
+ *  pin_array is a structure generated by the pins/pinsDebug.h header file.  It is generated by
+ *  the preprocessor. Only the signals associated with enabled options are in this table.
+ *  It contains:
+ *    - name of the signal
+ *    - the Ard_num assigned by the pins_YOUR_BOARD.h file using the platform defines.
+ *        EXAMPLE:  "#define KILL_PIN  PB1" results in Ard_num of 57.  57 is then used as the
+ *                  argument to digitalPinToPinName(IO) to get the Port_pin number
+ *    - if it is a digital or analog signal.  PWMs are considered digital here.
+ *
+ *  pin_xref is a structure generated by this header file.  It is generated by the
+ *  preprocessor. It is in port/pin order.  It contains just the port/pin numbers defined by the
+ *  platform for this variant.
+ *    - Ard_num
+ *    - printable version of Port_pin
+ *
+ *  Routines with an "x" as a parameter/argument are used to search the pin_array to try to
+ *  find a signal name associated with a port/pin.
+ *
+ *  NOTE -  the Arduino pin number is what is used by the M42 command, NOT the port/pin for that
+ *          signal.  The Arduino pin number is listed by the M43 I command.
+ */
+
+////////////////////////////////////////////////////////
+//
+// make a list of the Arduino pin numbers in the Port/Pin order
+//
+
+#define _PIN_ADD_2(NAME_ALPHA, ARDUINO_NUM) { {NAME_ALPHA}, ARDUINO_NUM },
+#define _PIN_ADD(NAME_ALPHA, ARDUINO_NUM) { NAME_ALPHA, ARDUINO_NUM },
+#define PIN_ADD(NAME) _PIN_ADD(#NAME, NAME)
+
+typedef struct {
+  char Port_pin_alpha[5];
+  pin_t Ard_num;
+} XrefInfo;
+
+const XrefInfo pin_xref[] PROGMEM = {
+  #include "pins_Xref.h"
+};
+
+////////////////////////////////////////////////////////////
+
+#define MODE_PIN_INPUT  0 // Input mode (reset state)
+#define MODE_PIN_OUTPUT 1 // General purpose output mode
+#define MODE_PIN_ALT    2 // Alternate function mode
+#define MODE_PIN_ANALOG 3 // Analog mode
+
+#define PIN_NUM(P) (P & 0x000F)
+#define PIN_NUM_ALPHA_LEFT(P) (((P & 0x000F) < 10) ? ('0' + (P & 0x000F)) : '1')
+#define PIN_NUM_ALPHA_RIGHT(P) (((P & 0x000F) > 9)  ? ('0' + (P & 0x000F) - 10) : 0 )
+#define PORT_NUM(P) ((P  >> 4) & 0x0007)
+#define PORT_ALPHA(P) ('A' + (P  >> 4))
+
+/**
+ * Translation of routines & variables used by pinsDebug.h
+ */
+#define NUMBER_PINS_TOTAL NUM_DIGITAL_PINS
+#define VALID_PIN(ANUM) ((ANUM) >= 0 && (ANUM) < NUMBER_PINS_TOTAL)
+#define digitalRead_mod(Ard_num) extDigitalRead(Ard_num)  // must use Arduino pin numbers when doing reads
+#define PRINT_PIN(Q)
+#define PRINT_PORT(ANUM) port_print(ANUM)
+#define DIGITAL_PIN_TO_ANALOG_PIN(ANUM) -1  // will report analog pin number in the print port routine
+#define GET_PIN_MAP_PIN_M43(Index) pin_xref[Index].Ard_num
+
+// x is a variable used to search pin_array
+#define GET_ARRAY_IS_DIGITAL(x) ((bool) pin_array[x].is_digital)
+#define GET_ARRAY_PIN(x) ((pin_t) pin_array[x].pin)
+#define PRINT_ARRAY_NAME(x) do{ sprintf_P(buffer, PSTR("%-" STRINGIFY(MAX_NAME_LENGTH) "s"), pin_array[x].name); SERIAL_ECHO(buffer); }while(0)
+#define MULTI_NAME_PAD 33 // space needed to be pretty if not first name assigned to a pin
+
+#ifndef M43_NEVER_TOUCH
+  #define _M43_NEVER_TOUCH(Index) (Index >= 9 && Index <= 12) // SERIAL/USB pins: PA9(TX) PA10(RX) PA11(USB_DM) PA12(USB_DP)
+  #ifdef KILL_PIN
+    #define M43_NEVER_TOUCH(Index) m43_never_touch(Index)
+
+    bool m43_never_touch(const pin_t Index) {
+      static pin_t M43_kill_index = -1;
+      if (M43_kill_index < 0)
+        for (M43_kill_index = 0; M43_kill_index < NUMBER_PINS_TOTAL; M43_kill_index++)
+          if (KILL_PIN == GET_PIN_MAP_PIN_M43(M43_kill_index)) break;
+      return _M43_NEVER_TOUCH(Index) || Index == M43_kill_index; // KILL_PIN and SERIAL/USB
+    }
+  #else
+    #define M43_NEVER_TOUCH(Index) _M43_NEVER_TOUCH(Index)
+  #endif
+#endif
+
+uint8_t get_pin_mode(const pin_t Ard_num) {
+  const PinName dp = digitalPinToPinName(Ard_num);
+  uint32_t ll_pin  = STM_LL_GPIO_PIN(dp);
+  GPIO_TypeDef *port = get_GPIO_Port(STM_PORT(dp));
+  uint32_t mode = LL_GPIO_GetPinMode(port, ll_pin);
+  switch (mode) {
+    case LL_GPIO_MODE_ANALOG: return MODE_PIN_ANALOG;
+    case LL_GPIO_MODE_INPUT: return MODE_PIN_INPUT;
+    case LL_GPIO_MODE_OUTPUT: return MODE_PIN_OUTPUT;
+    case LL_GPIO_MODE_ALTERNATE: return MODE_PIN_ALT;
+    TERN_(STM32F1xx, case LL_GPIO_MODE_FLOATING:)
+    default: return 0;
+  }
+}
+
+bool GET_PINMODE(const pin_t Ard_num) {
+  const uint8_t pin_mode = get_pin_mode(Ard_num);
+  return pin_mode == MODE_PIN_OUTPUT || pin_mode == MODE_PIN_ALT;  // assume all alt definitions are PWM
+}
+
+int8_t digital_pin_to_analog_pin(pin_t Ard_num) {
+  Ard_num -= NUM_ANALOG_FIRST;
+  return (Ard_num >= 0 && Ard_num < NUM_ANALOG_INPUTS) ? Ard_num : -1;
+}
+
+bool IS_ANALOG(const pin_t Ard_num) {
+  return get_pin_mode(Ard_num) == MODE_PIN_ANALOG;
+}
+
+bool is_digital(const pin_t x) {
+  const uint8_t pin_mode = get_pin_mode(pin_array[x].pin);
+  return pin_mode == MODE_PIN_INPUT || pin_mode == MODE_PIN_OUTPUT;
+}
+
+void port_print(const pin_t Ard_num) {
+  char buffer[16];
+  pin_t Index;
+  for (Index = 0; Index < NUMBER_PINS_TOTAL; Index++)
+    if (Ard_num == GET_PIN_MAP_PIN_M43(Index)) break;
+
+  const char * ppa = pin_xref[Index].Port_pin_alpha;
+  sprintf_P(buffer, PSTR("%s"), ppa);
+  SERIAL_ECHO(buffer);
+  if (ppa[3] == '\0') SERIAL_CHAR(' ');
+
+  // print analog pin number
+  const int8_t Port_pin = digital_pin_to_analog_pin(Ard_num);
+  if (Port_pin >= 0) {
+    sprintf_P(buffer, PSTR(" (A%d) "), Port_pin);
+    SERIAL_ECHO(buffer);
+    if (Port_pin < 10) SERIAL_CHAR(' ');
+  }
+  else
+    SERIAL_ECHO_SP(7);
+
+  // Print number to be used with M42
+  sprintf_P(buffer, PSTR(" M42 P%d "), Ard_num);
+  SERIAL_ECHO(buffer);
+  if (Ard_num < 10) SERIAL_CHAR(' ');
+  if (Ard_num < 100) SERIAL_CHAR(' ');
+}
+
+bool pwm_status(const pin_t Ard_num) {
+  return get_pin_mode(Ard_num) == MODE_PIN_ALT;
+}
+
+void pwm_details(const pin_t Ard_num) {
+  #ifndef STM32F1xx
+    if (pwm_status(Ard_num)) {
+      uint32_t alt_all = 0;
+      const PinName dp = digitalPinToPinName(Ard_num);
+      pin_t pin_number = uint8_t(PIN_NUM(dp));
+      const bool over_7 = pin_number >= 8;
+      const uint8_t ind = over_7 ? 1 : 0;
+      switch (PORT_ALPHA(dp)) {  // get alt function
+        case 'A' : alt_all = GPIOA->AFR[ind]; break;
+        case 'B' : alt_all = GPIOB->AFR[ind]; break;
+        case 'C' : alt_all = GPIOC->AFR[ind]; break;
+        case 'D' : alt_all = GPIOD->AFR[ind]; break;
+        #ifdef PE_0
+          case 'E' : alt_all = GPIOE->AFR[ind]; break;
+        #elif defined (PF_0)
+          case 'F' : alt_all = GPIOF->AFR[ind]; break;
+        #elif defined (PG_0)
+          case 'G' : alt_all = GPIOG->AFR[ind]; break;
+        #elif defined (PH_0)
+          case 'H' : alt_all = GPIOH->AFR[ind]; break;
+        #elif defined (PI_0)
+          case 'I' : alt_all = GPIOI->AFR[ind]; break;
+        #elif defined (PJ_0)
+          case 'J' : alt_all = GPIOJ->AFR[ind]; break;
+        #elif defined (PK_0)
+          case 'K' : alt_all = GPIOK->AFR[ind]; break;
+        #elif defined (PL_0)
+          case 'L' : alt_all = GPIOL->AFR[ind]; break;
+        #endif
+      }
+      if (over_7) pin_number -= 8;
+
+      uint8_t alt_func = (alt_all >> (4 * pin_number)) & 0x0F;
+      SERIAL_ECHOPAIR("Alt Function: ", alt_func);
+      if (alt_func < 10) SERIAL_CHAR(' ');
+      SERIAL_ECHOPGM(" - ");
+      switch (alt_func) {
+        case  0 : SERIAL_ECHOPGM("system (misc. I/O)"); break;
+        case  1 : SERIAL_ECHOPGM("TIM1/TIM2 (probably PWM)"); break;
+        case  2 : SERIAL_ECHOPGM("TIM3..5 (probably PWM)"); break;
+        case  3 : SERIAL_ECHOPGM("TIM8..11 (probably PWM)"); break;
+        case  4 : SERIAL_ECHOPGM("I2C1..3"); break;
+        case  5 : SERIAL_ECHOPGM("SPI1/SPI2"); break;
+        case  6 : SERIAL_ECHOPGM("SPI3"); break;
+        case  7 : SERIAL_ECHOPGM("USART1..3"); break;
+        case  8 : SERIAL_ECHOPGM("USART4..6"); break;
+        case  9 : SERIAL_ECHOPGM("CAN1/CAN2, TIM12..14  (probably PWM)"); break;
+        case 10 : SERIAL_ECHOPGM("OTG"); break;
+        case 11 : SERIAL_ECHOPGM("ETH"); break;
+        case 12 : SERIAL_ECHOPGM("FSMC, SDIO, OTG"); break;
+        case 13 : SERIAL_ECHOPGM("DCMI"); break;
+        case 14 : SERIAL_ECHOPGM("unused (shouldn't see this)"); break;
+        case 15 : SERIAL_ECHOPGM("EVENTOUT"); break;
+      }
+    }
+  #else
+    // TODO: F1 doesn't support changing pins function, so we need to check the function of the PIN and if it's enabled
+  #endif
+} // pwm_details