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author | Georgiy Bondarenko <69736697+nehilo@users.noreply.github.com> | 2021-03-04 20:54:23 +0300 |
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committer | Georgiy Bondarenko <69736697+nehilo@users.noreply.github.com> | 2021-03-04 20:54:23 +0300 |
commit | e8701195e66f2d27ffe17fb514eae8173795aaf7 (patch) | |
tree | 9f519c4abf6556b9ae7190a6210d87ead1dfadde /Marlin/src/HAL/DUE/InterruptVectors.cpp | |
download | kp3s-lgvl-e8701195e66f2d27ffe17fb514eae8173795aaf7.tar.xz kp3s-lgvl-e8701195e66f2d27ffe17fb514eae8173795aaf7.zip |
Initial commit
Diffstat (limited to 'Marlin/src/HAL/DUE/InterruptVectors.cpp')
-rw-r--r-- | Marlin/src/HAL/DUE/InterruptVectors.cpp | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/Marlin/src/HAL/DUE/InterruptVectors.cpp b/Marlin/src/HAL/DUE/InterruptVectors.cpp new file mode 100644 index 0000000..e4e0ce9 --- /dev/null +++ b/Marlin/src/HAL/DUE/InterruptVectors.cpp @@ -0,0 +1,98 @@ +/** + * 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 |