Mercurial > public > ostc4
view Small_CPU/CPU2-RTE.ld @ 232:f0069f002c55 div-fixes-4-1
Bugfix: make date/time setting work over reboots
Setting the time/date over the UART interface or by the menu, seems
to work, but a reboot of the RTE brings back strange, seemingly
random, time.
The reason for this is rather simple. In the settings, a time
is stored, based on some flawed logic, and that time was restored
on reboot. There is no reason to store any time, when the moment of
restoring it is unrelated in time. So, the fix is simple: do not
set time (in the RTC) based on some time from the past. The whole idea
of a RTC is that it does preserve the time for you, as long its
powered. Any attempt to do things better using stored time data is
futile (and nonsense).
And while working on his, also kick out some useless code from the RTE.
There is no reason to initialize the time on the RTC to some random
time/date in the past. A zero data/time is as good and any random
date.
Signed-off-by: Jan Mulder <jlmulder@xs4all.nl>
author | Jan Mulder <jlmulder@xs4all.nl> |
---|---|
date | Wed, 03 Apr 2019 21:11:56 +0200 |
parents | 321df89d5710 |
children | aa286a4926c2 |
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/* ---------------------------------------------------------------------------- */ /* Em::Blocks embedded development Support */ /* ---------------------------------------------------------------------------- */ /* Copyright (c) 2014, EmBlocks */ /* */ /* All rights reserved. */ /* */ /* Redistribution and use in source and binary forms, with or without */ /* modification, are permitted provided that the following condition is met: */ /* */ /* - Redistributions of source code must retain the above copyright notice, */ /* this list of conditions and the disclaimer below. */ /* */ /* EmBlocks's name may not be used to endorse or promote products derived from */ /* this software without specific prior written permission. */ /* */ /* DISCLAIMER: THIS SOFTWARE IS PROVIDED BY EBLOCKS "AS IS" AND ANY EXPRESS OR */ /* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF */ /* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE */ /* DISCLAIMED. IN NO EVENT SHALL EMBLOCKS BE LIABLE FOR ANY DIRECT, INDIRECT, */ /* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT */ /* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, */ /* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF */ /* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING */ /* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, */ /* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /* ---------------------------------------------------------------------------- */ /*------------------------------------------------------------------------------ * Linker script for running in internal FLASH on the STM32F401RE *----------------------------------------------------------------------------*/ /* Entry Point */ ENTRY(Reset_Handler) OUTPUT_FORMAT("elf32-littlearm", "elf32-littlearm", "elf32-littlearm") OUTPUT_ARCH(arm) SEARCH_DIR(.) /* Memory Spaces Definitions */ MEMORY { ROM (rx) : ORIGIN = 0x08000000, LENGTH = 512K /* 80000 */ RAM (rwx) : ORIGIN = 0x20000000, LENGTH = 96K } /* Linker script to place sections and symbol values. Should be used together * with other linker script that defines memory regions FLASH and RAM. * It references following symbols, which must be defined in code: * Reset_Handler : Entry of reset handler * * It defines following symbols, which code can use without definition: * __exidx_start * __exidx_end * __etext * __data_start__ * __preinit_array_start * __preinit_array_end * __init_array_start * __init_array_end * __fini_array_start * __fini_array_end * __data_end__ * __bss_start__ * __bss_end__ * __end__ * end * __HeapLimit * __StackLimit * __StackTop * __stack */ SECTIONS { .isr_vector 0x08000000 : { . = ALIGN(4); KEEP( *(.isr_vector) ) KEEP(*(.init)) KEEP(*(.fini)) } >ROM /* Place FirmwareData at absolute address */ .firmware_data 0x08005000: { cpu2_FirmwareData = 0; KEEP( *(.firmware_data) ) } > ROM .text 0x08005100 : { . = ALIGN(4); *(.text) /* .text sections (code) */ *(.text*) *(.eh_frame*) . = ALIGN(4); } > ROM /********************** Constant data into ROM memory *********************/ .rodata : { . = ALIGN(4); *(.rodata) /* .rodata sections (constants, strings, etc.) */ *(.rodata*) /* .rodata* sections (constants, strings, etc.) */ . = ALIGN(4); } >ROM .ARM.extab : { *(.ARM.extab* .gnu.linkonce.armextab.*) } > ROM __exidx_start = .; .ARM.exidx : { *(.ARM.exidx* .gnu.linkonce.armexidx.*) } > ROM __exidx_end = .; .preinit_array : { . = ALIGN(4); PROVIDE_HIDDEN( __preinit_array_start = . ); KEEP( *(.preinit_array*) ) PROVIDE_HIDDEN( __preinit_array_end = . ); . = ALIGN(4); } >ROM .init_array : { . = ALIGN(4); PROVIDE_HIDDEN( __init_array_start = . ); KEEP( *(SORT(.init_array.*)) ) KEEP( *(.init_array*) ) PROVIDE_HIDDEN( __init_array_end = . ); . = ALIGN(4); } >ROM .fini_array : { . = ALIGN(4); PROVIDE_HIDDEN( __fini_array_start = . ); KEEP( *(SORT(.fini_array.*)) ) KEEP( *(.fini_array*) ) PROVIDE_HIDDEN( __fini_array_end = . ); . = ALIGN(4); __etext = .; /* define a global symbols at end of code */ } >ROM /* Used by the startup to initialize data */ _sidata = LOADADDR(.data); .data : { . = ALIGN(4); __data_start__ = .; _sdata = .; /* create a global symbol at data start */ *(.data) /* .data sections */ *(.data*) *(vtable) . = ALIGN(4); /* All data end */ __data_end__ = .; } >RAM AT>ROM .bss : { __bss_start__ = .; *(.bss*) *(COMMON) __bss_end__ = .; } >RAM .heap : { __end__ = .; end = __end__; *(.heap*) __HeapLimit = .; } > RAM /* .stack_dummy section doesn't contains any symbols. It is only * used for linker to calculate size of stack sections, and assign * values to stack symbols later */ .stack_dummy : { *(.stack) } > RAM /* Set stack top to end of RAM, and stack limit move down by * size of stack_dummy section */ __StackTop = ORIGIN(RAM) + LENGTH(RAM); __StackLimit = __StackTop - SIZEOF(.stack_dummy); PROVIDE(__stack = __StackTop); /* Check if data + heap + stack exceeds RAM limit */ ASSERT(__StackLimit >= __HeapLimit, "region RAM overflowed with stack") }