1 files changed, 141 insertions, 0 deletions
diff --git a/Marlin/src/HAL/LINUX/hardware/Gpio.h b/Marlin/src/HAL/LINUX/hardware/Gpio.h
new file mode 100644
index 0000000..2d9b1f2
--- /dev/null
+++ b/Marlin/src/HAL/LINUX/hardware/Gpio.h
@@ -0,0 +1,141 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * 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 "Clock.h"
+#include "../../../inc/MarlinConfigPre.h"
+#include <stdint.h>
+
+typedef int16_t pin_type;
+
+struct GpioEvent {
+  enum Type {
+    NOP,
+    FALL,
+    RISE,
+    SET_VALUE,
+    SETM,
+    SETD
+  };
+  uint64_t timestamp;
+  pin_type pin_id;
+  GpioEvent::Type event;
+
+  GpioEvent(uint64_t timestamp, pin_type pin_id, GpioEvent::Type event){
+    this->timestamp = timestamp;
+    this->pin_id = pin_id;
+    this->event = event;
+  }
+};
+
+class IOLogger {
+public:
+  virtual ~IOLogger(){};
+  virtual void log(GpioEvent ev) = 0;
+};
+
+class Peripheral {
+public:
+  virtual ~Peripheral(){};
+  virtual void interrupt(GpioEvent ev) = 0;
+  virtual void update() = 0;
+};
+
+struct pin_data {
+  uint8_t dir;
+  uint8_t mode;
+  uint16_t value;
+  Peripheral* cb;
+};
+
+class Gpio {
+public:
+
+  static const pin_type pin_count = 255;
+  static pin_data pin_map[pin_count+1];
+
+  static bool valid_pin(pin_type pin) {
+    return pin >= 0 && pin <= pin_count;
+  }
+
+  static void set(pin_type pin) {
+    set(pin, 1);
+  }
+
+  static void set(pin_type pin, uint16_t value) {
+    if (!valid_pin(pin)) return;
+    GpioEvent::Type evt_type = value > 1 ? GpioEvent::SET_VALUE : value > pin_map[pin].value ? GpioEvent::RISE : value < pin_map[pin].value ? GpioEvent::FALL : GpioEvent::NOP;
+    pin_map[pin].value = value;
+    GpioEvent evt(Clock::nanos(), pin, evt_type);
+    if (pin_map[pin].cb) {
+      pin_map[pin].cb->interrupt(evt);
+    }
+    if (Gpio::logger) Gpio::logger->log(evt);
+  }
+
+  static uint16_t get(pin_type pin) {
+    if (!valid_pin(pin)) return 0;
+    return pin_map[pin].value;
+  }
+
+  static void clear(pin_type pin) {
+    set(pin, 0);
+  }
+
+  static void setMode(pin_type pin, uint8_t value) {
+    if (!valid_pin(pin)) return;
+    pin_map[pin].mode = value;
+    GpioEvent evt(Clock::nanos(), pin, GpioEvent::Type::SETM);
+    if (pin_map[pin].cb) pin_map[pin].cb->interrupt(evt);
+    if (Gpio::logger) Gpio::logger->log(evt);
+  }
+
+  static uint8_t getMode(pin_type pin) {
+    if (!valid_pin(pin)) return 0;
+    return pin_map[pin].mode;
+  }
+
+  static void setDir(pin_type pin, uint8_t value) {
+    if (!valid_pin(pin)) return;
+    pin_map[pin].dir = value;
+    GpioEvent evt(Clock::nanos(), pin, GpioEvent::Type::SETD);
+    if (pin_map[pin].cb) pin_map[pin].cb->interrupt(evt);
+    if (Gpio::logger) Gpio::logger->log(evt);
+  }
+
+  static uint8_t getDir(pin_type pin) {
+    if (!valid_pin(pin)) return 0;
+    return pin_map[pin].dir;
+  }
+
+  static void attachPeripheral(pin_type pin, Peripheral* per) {
+    if (!valid_pin(pin)) return;
+    pin_map[pin].cb = per;
+  }
+
+  static void attachLogger(IOLogger* logger) {
+    Gpio::logger = logger;
+  }
+
+private:
+  static IOLogger* logger;
+};