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- /**
- * Marlin 3D Printer Firmware
- * Copyright (c) 2021 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
- *
- * Based on Sprinter and grbl.
- * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
- * Copyright (c) 2017 Victor Perez
- *
- * 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/>.
- *
- */
- #include "../platforms.h"
-
- #ifdef HAL_STM32
-
- #include "../../inc/MarlinConfigPre.h"
-
- #if ENABLED(POSTMORTEM_DEBUGGING)
-
- #include "../shared/MinSerial.h"
-
- /* Instruction Synchronization Barrier */
- #define isb() __asm__ __volatile__ ("isb" : : : "memory")
-
- /* Data Synchronization Barrier */
- #define dsb() __asm__ __volatile__ ("dsb" : : : "memory")
-
- // Dumb mapping over the registers of a USART device on STM32
- struct USARTMin {
- volatile uint32_t SR;
- volatile uint32_t DR;
- volatile uint32_t BRR;
- volatile uint32_t CR1;
- volatile uint32_t CR2;
- };
-
- #if WITHIN(SERIAL_PORT, 1, 6)
- // Depending on the CPU, the serial port is different for USART1
- static const uintptr_t regsAddr[] = {
- TERN(STM32F1xx, 0x40013800, 0x40011000), // USART1
- 0x40004400, // USART2
- 0x40004800, // USART3
- 0x40004C00, // UART4_BASE
- 0x40005000, // UART5_BASE
- 0x40011400 // USART6
- };
- static USARTMin * regs = (USARTMin*)regsAddr[SERIAL_PORT - 1];
- #endif
-
- static void TXBegin() {
- #if !WITHIN(SERIAL_PORT, 1, 6)
- #warning "Using POSTMORTEM_DEBUGGING requires a physical U(S)ART hardware in case of severe error."
- #warning "Disabling the severe error reporting feature currently because the used serial port is not a HW port."
- #else
- // This is common between STM32F1/STM32F2 and STM32F4
- const int nvicUART[] = { /* NVIC_USART1 */ 37, /* NVIC_USART2 */ 38, /* NVIC_USART3 */ 39, /* NVIC_UART4 */ 52, /* NVIC_UART5 */ 53, /* NVIC_USART6 */ 71 };
- int nvicIndex = nvicUART[SERIAL_PORT - 1];
-
- struct NVICMin {
- volatile uint32_t ISER[32];
- volatile uint32_t ICER[32];
- };
-
- NVICMin *nvicBase = (NVICMin*)0xE000E100;
- SBI32(nvicBase->ICER[nvicIndex >> 5], nvicIndex & 0x1F);
-
- // 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();
-
- // Example for USART1 disable: (RCC->APB2ENR &= ~(RCC_APB2ENR_USART1EN))
- // Too difficult to reimplement here, let's query the STM32duino macro here
- #if SERIAL_PORT == 1
- __HAL_RCC_USART1_CLK_DISABLE();
- __HAL_RCC_USART1_CLK_ENABLE();
- #elif SERIAL_PORT == 2
- __HAL_RCC_USART2_CLK_DISABLE();
- __HAL_RCC_USART2_CLK_ENABLE();
- #elif SERIAL_PORT == 3
- __HAL_RCC_USART3_CLK_DISABLE();
- __HAL_RCC_USART3_CLK_ENABLE();
- #elif SERIAL_PORT == 4
- __HAL_RCC_UART4_CLK_DISABLE(); // BEWARE: UART4 and not USART4 here
- __HAL_RCC_UART4_CLK_ENABLE();
- #elif SERIAL_PORT == 5
- __HAL_RCC_UART5_CLK_DISABLE(); // BEWARE: UART5 and not USART5 here
- __HAL_RCC_UART5_CLK_ENABLE();
- #elif SERIAL_PORT == 6
- __HAL_RCC_USART6_CLK_DISABLE();
- __HAL_RCC_USART6_CLK_ENABLE();
- #endif
-
- uint32_t brr = regs->BRR;
- regs->CR1 = 0; // Reset the USART
- regs->CR2 = 0; // 1 stop bit
-
- // If we don't touch the BRR (baudrate register), we don't need to recompute.
- regs->BRR = brr;
-
- regs->CR1 = _BV(3) | _BV(13); // 8 bits, no parity, 1 stop bit (TE | UE)
- #endif
- }
-
- // A SW memory barrier, to ensure GCC does not overoptimize loops
- #define sw_barrier() __asm__ volatile("": : :"memory");
- static void TX(char c) {
- #if WITHIN(SERIAL_PORT, 1, 6)
- constexpr uint32_t usart_sr_txe = _BV(7);
- while (!(regs->SR & usart_sr_txe)) {
- hal.watchdog_refresh();
- sw_barrier();
- }
- regs->DR = c;
- #else
- // Let's hope a mystical guru will fix this, one day by writing interrupt-free USB CDC ACM code (or, at least, by polling the registers since interrupt will be queued but will never trigger)
- // For now, it's completely lost to oblivion.
- #endif
- }
-
- void install_min_serial() {
- HAL_min_serial_init = &TXBegin;
- HAL_min_serial_out = &TX;
- }
-
- #if NONE(DYNAMIC_VECTORTABLE, STM32F0xx, STM32G0xx) // Cortex M0 can't jump to a symbol that's too far from the current function, so we work around this in exception_arm.cpp
- extern "C" {
- __attribute__((naked)) void JumpHandler_ASM() {
- __asm__ __volatile__ (
- "b CommonHandler_ASM\n"
- );
- }
- void __attribute__((naked, alias("JumpHandler_ASM"), nothrow)) HardFault_Handler();
- void __attribute__((naked, alias("JumpHandler_ASM"), nothrow)) BusFault_Handler();
- void __attribute__((naked, alias("JumpHandler_ASM"), nothrow)) UsageFault_Handler();
- void __attribute__((naked, alias("JumpHandler_ASM"), nothrow)) MemManage_Handler();
- void __attribute__((naked, alias("JumpHandler_ASM"), nothrow)) NMI_Handler();
- }
- #endif
-
- #endif // POSTMORTEM_DEBUGGING
- #endif // HAL_STM32
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