/* @file stm32l05x-nvm-prog-erase.cc * * This file is part of the Black Magic Debug project. * * Copyright (C) 2014 Woollysoft * Written by Marc Singer * * 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 . */ /* ----------- DESCRIPTION ----------- NVM program flash erase stub for STM32L05x, a Cortex-M0+ core. The stub uses SRAM to host the code fragment to perform the erase. This stub works with the STM32L1xx given a few options. If you plan to modify this routine and emit a new stub, make sure to audit the code. We don't have a stack so we cannot make calls that save the link pointer. IOW, the inline functions should be be inlined. */ #include #include #include "../src/include/stm32lx-nvm.h" /* Erase a region of flash. In the event that the erase is misaligned with respect to pages, it will erase the pages that contain the requested range of bytes. */ extern "C" void __attribute((naked)) stm32l05x_nvm_prog_erase() { // Leave room for INFO at second word of routine __asm volatile ("b 0f\n\t" ".align 2\n\t" ".word 0\n\t" ".word 0\n\t" ".word 0\n\t" ".word 0\n\t" ".word 0\n\t" "0:"); auto& nvm = Nvm (Info.nvm); // Align to the start of the first page so that we make sure to erase // all of the target pages. auto remainder = reinterpret_cast (Info.destination) & (Info.page_size - 1); Info.size += remainder; Info.destination -= remainder/sizeof (*Info.destination); if (!unlock(nvm)) goto quit; nvm.sr = STM32Lx_NVM_SR_ERR_M; // Clear errors // Enable erasing nvm.pecr = STM32Lx_NVM_PECR_PROG | STM32Lx_NVM_PECR_ERASE; if ((nvm.pecr & (STM32Lx_NVM_PECR_PROG | STM32Lx_NVM_PECR_ERASE)) != (STM32Lx_NVM_PECR_PROG | STM32Lx_NVM_PECR_ERASE)) goto quit; while (Info.size > 0) { *Info.destination = 0; // Initiate erase Info.destination += Info.page_size/sizeof (*Info.destination); Info.size -= Info.page_size; } quit: lock(nvm); __asm volatile ("bkpt"); } /* Local Variables: 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" End: */