Shorter paths to HAL, ExtUI (#17156)

Marlin/src/HAL/LINUX/HAL.cpp

@@ -0,0 +1,82 @@
+/**
+ * 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 <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifdef __PLAT_LINUX__
+
+#include "../../inc/MarlinConfig.h"
+#include "../shared/Delay.h"
+
+HalSerial usb_serial;
+
+// U8glib required functions
+extern "C" void u8g_xMicroDelay(uint16_t val) {
+  DELAY_US(val);
+}
+extern "C" void u8g_MicroDelay() {
+  u8g_xMicroDelay(1);
+}
+extern "C" void u8g_10MicroDelay() {
+  u8g_xMicroDelay(10);
+}
+extern "C" void u8g_Delay(uint16_t val) {
+  delay(val);
+}
+//************************//
+
+// return free heap space
+int freeMemory() {
+  return 0;
+}
+
+// ------------------------
+// ADC
+// ------------------------
+
+void HAL_adc_init() {
+
+}
+
+void HAL_adc_enable_channel(const uint8_t ch) {
+
+}
+
+uint8_t active_ch = 0;
+void HAL_adc_start_conversion(const uint8_t ch) {
+  active_ch = ch;
+}
+
+bool HAL_adc_finished() {
+  return true;
+}
+
+uint16_t HAL_adc_get_result() {
+  pin_t pin = analogInputToDigitalPin(active_ch);
+  if (!VALID_PIN(pin)) return 0;
+  uint16_t data = ((Gpio::get(pin) >> 2) & 0x3FF);
+  return data;    // return 10bit value as Marlin expects
+}
+
+void HAL_pwm_init() {
+
+}
+
+#endif // __PLAT_LINUX__