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- /**
- * Marlin 3D Printer Firmware
- * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
- * Copyright (c) 2016 Bob Cousins bobcousins42@googlemail.com
- *
- * 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/>.
- *
- */
-
- /**
- * HAL for Arduino Due and compatible (SAM3X8E)
- */
-
- #ifdef ARDUINO_ARCH_SAM
-
- #include "../../inc/MarlinConfig.h"
- #include "../../MarlinCore.h"
-
- #include <Wire.h>
- #include "usb/usb_task.h"
-
- // ------------------------
- // Public Variables
- // ------------------------
-
- uint16_t MarlinHAL::adc_result;
-
- // ------------------------
- // Public functions
- // ------------------------
-
- #if ENABLED(POSTMORTEM_DEBUGGING)
- extern void install_min_serial();
- #endif
-
- void MarlinHAL::init() {
- #if ENABLED(SDSUPPORT)
- OUT_WRITE(SDSS, HIGH); // Try to set SDSS inactive before any other SPI users start up
- #endif
- usb_task_init(); // Initialize the USB stack
- TERN_(POSTMORTEM_DEBUGGING, install_min_serial()); // Install the min serial handler
- }
-
- void MarlinHAL::init_board() {
- #ifdef BOARD_INIT
- BOARD_INIT();
- #endif
- }
-
- void MarlinHAL::idletask() { usb_task_idle(); } // Perform USB stack housekeeping
-
- uint8_t MarlinHAL::get_reset_source() {
- switch ((RSTC->RSTC_SR >> 8) & 0x07) {
- case 0: return RST_POWER_ON;
- case 1: return RST_BACKUP;
- case 2: return RST_WATCHDOG;
- case 3: return RST_SOFTWARE;
- case 4: return RST_EXTERNAL;
- default: return 0;
- }
- }
-
- void MarlinHAL::reboot() { rstc_start_software_reset(RSTC); }
-
- // ------------------------
- // Watchdog Timer
- // ------------------------
-
- #if ENABLED(USE_WATCHDOG)
-
- // Initialize watchdog - On SAM3X, Watchdog was already configured
- // and enabled or disabled at startup, so no need to reconfigure it
- // here.
- void MarlinHAL::watchdog_init() { WDT_Restart(WDT); } // Reset watchdog to start clean
-
- // Reset watchdog. MUST be called at least every 4 seconds after the
- // first watchdog_init or AVR will go into emergency procedures.
- void MarlinHAL::watchdog_refresh() { watchdogReset(); }
-
- #endif
-
- // Override Arduino runtime to either config or disable the watchdog
- //
- // We need to configure the watchdog as soon as possible in the boot
- // process, because watchdog initialization at hardware reset on SAM3X8E
- // is unreliable, and there is risk of unintended resets if we delay
- // that initialization to a later time.
- void watchdogSetup() {
-
- #if ENABLED(USE_WATCHDOG)
-
- // 4 seconds timeout
- uint32_t timeout = TERN(WATCHDOG_DURATION_8S, 8000, 4000);
-
- // Calculate timeout value in WDT counter ticks: This assumes
- // the slow clock is running at 32.768 kHz watchdog
- // frequency is therefore 32768 / 128 = 256 Hz
- timeout = (timeout << 8) / 1000;
- if (timeout == 0)
- timeout = 1;
- else if (timeout > 0xFFF)
- timeout = 0xFFF;
-
- // We want to enable the watchdog with the specified timeout
- uint32_t value =
- WDT_MR_WDV(timeout) | // With the specified timeout
- WDT_MR_WDD(timeout) | // and no invalid write window
- #if !(SAMV70 || SAMV71 || SAME70 || SAMS70)
- WDT_MR_WDRPROC | // WDT fault resets processor only - We want
- // to keep PIO controller state
- #endif
- WDT_MR_WDDBGHLT | // WDT stops in debug state.
- WDT_MR_WDIDLEHLT; // WDT stops in idle state.
-
- #if ENABLED(WATCHDOG_RESET_MANUAL)
- // We enable the watchdog timer, but only for the interrupt.
-
- // Configure WDT to only trigger an interrupt
- value |= WDT_MR_WDFIEN; // Enable WDT fault interrupt.
-
- // Disable WDT interrupt (just in case, to avoid triggering it!)
- NVIC_DisableIRQ(WDT_IRQn);
-
- // We NEED memory barriers to ensure Interrupts are actually disabled!
- // ( https://dzone.com/articles/nvic-disabling-interrupts-on-arm-cortex-m-and-the )
- __DSB();
- __ISB();
-
- // Initialize WDT with the given parameters
- WDT_Enable(WDT, value);
-
- // Configure and enable WDT interrupt.
- NVIC_ClearPendingIRQ(WDT_IRQn);
- NVIC_SetPriority(WDT_IRQn, 0); // Use highest priority, so we detect all kinds of lockups
- NVIC_EnableIRQ(WDT_IRQn);
-
- #else
-
- // a WDT fault triggers a reset
- value |= WDT_MR_WDRSTEN;
-
- // Initialize WDT with the given parameters
- WDT_Enable(WDT, value);
-
- #endif
-
- // Reset the watchdog
- WDT_Restart(WDT);
-
- #else
-
- // Make sure to completely disable the Watchdog
- WDT_Disable(WDT);
-
- #endif
- }
-
- // ------------------------
- // Free Memory Accessor
- // ------------------------
-
- extern "C" {
- extern unsigned int _ebss; // end of bss section
- }
-
- // Return free memory between end of heap (or end bss) and whatever is current
- int freeMemory() {
- int free_memory, heap_end = (int)_sbrk(0);
- return (int)&free_memory - (heap_end ?: (int)&_ebss);
- }
-
- // ------------------------
- // Serial Ports
- // ------------------------
-
- // Forward the default serial ports
- #if USING_HW_SERIAL0
- DefaultSerial1 MSerial0(false, Serial);
- #endif
- #if USING_HW_SERIAL1
- DefaultSerial2 MSerial1(false, Serial1);
- #endif
- #if USING_HW_SERIAL2
- DefaultSerial3 MSerial2(false, Serial2);
- #endif
- #if USING_HW_SERIAL3
- DefaultSerial4 MSerial3(false, Serial3);
- #endif
-
- #endif // ARDUINO_ARCH_SAM
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