94 lines
3.3 KiB
C++
94 lines
3.3 KiB
C++
/* @file stm32l05x-nvm-prog-erase.cc
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*
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* This file is part of the Black Magic Debug project.
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*
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* Copyright (C) 2014 Woollysoft
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* Written by Marc Singer <elf@woollysoft.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/* -----------
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DESCRIPTION
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-----------
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NVM program flash erase stub for STM32L05x, a Cortex-M0+ core. The
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stub uses SRAM to host the code fragment to perform the erase.
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This stub works with the STM32L1xx given a few options.
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If you plan to modify this routine and emit a new stub, make sure
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to audit the code. We don't have a stack so we cannot make calls
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that save the link pointer. IOW, the inline functions should be be
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inlined.
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*/
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#include <stdint.h>
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#include <string.h>
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#include "../src/include/stm32lx-nvm.h"
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/* Erase a region of flash. In the event that the erase is misaligned
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with respect to pages, it will erase the pages that contain the
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requested range of bytes. */
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extern "C" void __attribute((naked)) stm32l05x_nvm_prog_erase() {
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// Leave room for INFO at second word of routine
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__asm volatile ("b 0f\n\t"
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".align 2\n\t"
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".word 0\n\t"
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".word 0\n\t"
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".word 0\n\t"
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".word 0\n\t"
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".word 0\n\t"
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"0:");
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auto& nvm = Nvm (Info.nvm);
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// Align to the start of the first page so that we make sure to erase
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// all of the target pages.
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auto remainder = reinterpret_cast<uint32_t> (Info.destination)
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& (Info.page_size - 1);
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Info.size += remainder;
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Info.destination -= remainder/sizeof (*Info.destination);
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if (!unlock(nvm))
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goto quit;
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nvm.sr = STM32Lx_NVM_SR_ERR_M; // Clear errors
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// Enable erasing
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nvm.pecr = STM32Lx_NVM_PECR_PROG | STM32Lx_NVM_PECR_ERASE;
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if ((nvm.pecr & (STM32Lx_NVM_PECR_PROG | STM32Lx_NVM_PECR_ERASE))
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!= (STM32Lx_NVM_PECR_PROG | STM32Lx_NVM_PECR_ERASE))
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goto quit;
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while (Info.size > 0) {
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*Info.destination = 0; // Initiate erase
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Info.destination += Info.page_size/sizeof (*Info.destination);
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Info.size -= Info.page_size;
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}
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quit:
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lock(nvm);
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__asm volatile ("bkpt");
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}
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/*
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Local Variables:
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compile-command: "/opt/arm/arm-none-eabi-g++ -mcpu=cortex-m0plus -g -c -std=c++11 -mthumb -o stm32l05x-nvm-prog-erase.o -Os -Wa,-ahndl=stm32l05x-nvm-prog-erase.lst stm32l05x-nvm-prog-erase.cc ; /opt/arm/arm-none-eabi-objdump -d -z stm32l05x-nvm-prog-erase.o | ./dump-to-array.sh > stm32l05x-nvm-prog-erase.stub"
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End:
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*/
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