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authorGeorgiy Bondarenko <69736697+nehilo@users.noreply.github.com>2021-03-04 20:54:23 +0300
committerGeorgiy Bondarenko <69736697+nehilo@users.noreply.github.com>2021-03-04 20:54:23 +0300
commite8701195e66f2d27ffe17fb514eae8173795aaf7 (patch)
tree9f519c4abf6556b9ae7190a6210d87ead1dfadde /Marlin/src/HAL/DUE/InterruptVectors.cpp
downloadkp3s-lgvl-e8701195e66f2d27ffe17fb514eae8173795aaf7.tar.xz
kp3s-lgvl-e8701195e66f2d27ffe17fb514eae8173795aaf7.zip
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+/**
+ * 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/>.
+ *
+ */
+
+/**
+ * InterruptVectors_Due.cpp - This module relocates the Interrupt vector table to SRAM,
+ * allowing to register new interrupt handlers at runtime. Specially valuable and needed
+ * because Arduino runtime allocates some interrupt handlers that we NEED to override to
+ * properly support extended functionality, as for example, USB host or USB device (MSD, MTP)
+ * and custom serial port handlers, and we don't actually want to modify and/or recompile the
+ * Arduino runtime. We just want to run as much as possible on Stock Arduino
+ *
+ * Copyright (c) 2017 Eduardo José Tagle. All right reserved
+ */
+#ifdef ARDUINO_ARCH_SAM
+
+#include "../../inc/MarlinConfig.h"
+#include "HAL.h"
+#include "InterruptVectors.h"
+
+/* The relocated Exception/Interrupt Table - According to the ARM
+ reference manual, alignment to 128 bytes should suffice, but in
+ practice, we need alignment to 256 bytes to make this work in all
+ cases */
+__attribute__ ((aligned(256)))
+static DeviceVectors ram_tab = { nullptr };
+
+/**
+ * This function checks if the exception/interrupt table is already in SRAM or not.
+ * If it is not, then it copies the ROM table to the SRAM and relocates the table
+ * by reprogramming the NVIC registers
+ */
+static pfnISR_Handler* get_relocated_table_addr() {
+ // Get the address of the interrupt/exception table
+ uint32_t isrtab = SCB->VTOR;
+
+ // If already relocated, we are done!
+ if (isrtab >= IRAM0_ADDR)
+ return (pfnISR_Handler*)isrtab;
+
+ // Get the address of the table stored in FLASH
+ const pfnISR_Handler* romtab = (const pfnISR_Handler*)isrtab;
+
+ // Copy it to SRAM
+ memcpy(&ram_tab, romtab, sizeof(ram_tab));
+
+ // Disable global interrupts
+ CRITICAL_SECTION_START();
+
+ // Set the vector table base address to the SRAM copy
+ SCB->VTOR = (uint32_t)(&ram_tab);
+
+ // Reenable interrupts
+ CRITICAL_SECTION_END();
+
+ // Return the address of the table
+ return (pfnISR_Handler*)(&ram_tab);
+}
+
+pfnISR_Handler install_isr(IRQn_Type irq, pfnISR_Handler newHandler) {
+ // Get the address of the relocated table
+ pfnISR_Handler *isrtab = get_relocated_table_addr();
+
+ // Disable global interrupts
+ CRITICAL_SECTION_START();
+
+ // Get the original handler
+ pfnISR_Handler oldHandler = isrtab[irq + 16];
+
+ // Install the new one
+ isrtab[irq + 16] = newHandler;
+
+ // Reenable interrupts
+ CRITICAL_SECTION_END();
+
+ // Return the original one
+ return oldHandler;
+}
+
+#endif