113 lines
3.5 KiB
C++
113 lines
3.5 KiB
C++
/* @file stm32l05x-nvm-prog-write.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 writing stub for STM32L05x, a Cortex-M0+ core.
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The stub uses SRAM to host the code fragment and source data to
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perform a write to flash.
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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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/* Write a block of bytes to flash. The called is responsible for
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making sure that the address are aligned and that the count is an
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even multiple of words. */
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extern "C" void __attribute((naked)) stm32l05x_nvm_prog_write () {
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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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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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while (Info.size > 0) {
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// Either we're not half-page aligned or we have less than a half
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// page to write
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if (Info.size < Info.page_size/2
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|| (reinterpret_cast<uint32_t> (Info.destination)
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& (Info.page_size/2 - 1))) {
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nvm.pecr = (Info.options & OPT_STM32L1) ? 0
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: STM32Lx_NVM_PECR_PROG; // Word programming
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size_t c = Info.page_size/2
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- (reinterpret_cast<uint32_t> (Info.destination)
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& (Info.page_size/2 - 1));
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if (c > Info.size)
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c = Info.size;
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Info.size -= c;
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c /= 4;
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while (c--) {
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uint32_t v = *Info.source++;
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*Info.destination++ = v;
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if (nvm.sr & STM32Lx_NVM_SR_ERR_M)
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goto quit;
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}
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}
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// Or we are writing a half-page(s)
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else {
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nvm.pecr = STM32Lx_NVM_PECR_PROG | STM32Lx_NVM_PECR_FPRG; // Half-page prg
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size_t c = Info.size & ~(Info.page_size/2 - 1);
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Info.size -= c;
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c /= 4;
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while (c--) {
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uint32_t v = *Info.source++;
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*Info.destination++ = v;
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}
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if (nvm.sr & STM32Lx_NVM_SR_ERR_M)
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goto quit;
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}
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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-write.o -Os -Wa,-ahndl=stm32l05x-nvm-prog-write.lst stm32l05x-nvm-prog-write.cc ; /opt/arm/arm-none-eabi-objdump -S stm32l05x-nvm-prog-write.o | ./code-to-array.pl > stm32l05x-nvm-prog-write.stub"
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End:
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*/
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