From cab249f22d64f9faefac6baebb700d12a111de2f Mon Sep 17 00:00:00 2001 From: Tilman Sauerbeck Date: Thu, 11 Jul 2019 19:43:02 +0200 Subject: [PATCH] application: Add humble beginnings of the application code. This is just a USB serial hello world right now. --- SConscript.target | 28 ++++++ src/application/application.ld | 162 +++++++++++++++++++++++++++++++++ src/application/main.rs | 55 +++++++++++ src/application/start.c | 33 +++++++ 4 files changed, 278 insertions(+) create mode 100644 src/application/application.ld create mode 100644 src/application/main.rs create mode 100644 src/application/start.c diff --git a/SConscript.target b/SConscript.target index b5eb085..b42eece 100644 --- a/SConscript.target +++ b/SConscript.target @@ -83,3 +83,31 @@ for s in ['intermediate', 'final']: bootloader_bin = bootloader_env.Objcopy(bootloader_elf) Default(bootloader_bin) + +libapplication_source_files = [ + 'src/application/main.rs', # Must be listed first (see below). +] + +libapplication = env.Rustc('libapplication.a', libapplication_source_files[0]) + +for f in libapplication_source_files: + Depends(libapplication, f) + +Depends(libapplication, 'libcommon.rlib') +Depends(libapplication, 'libcommon.a') + +start_o = env.Object('src/application/start.c') + +application_env = env.Clone() + +application_env.Append(LINKFLAGS = [ + '-Tsrc/application/application.ld' +]) + +application_elf = application_env.Program('gps-watch-application.elf', + start_o, + LIBS = ['application', 'common']) + +application_bin = application_env.Objcopy(application_elf) + +Default(application_bin) diff --git a/src/application/application.ld b/src/application/application.ld new file mode 100644 index 0000000..55b6057 --- /dev/null +++ b/src/application/application.ld @@ -0,0 +1,162 @@ +/* This is a copy of + * CMSIS/Device/ARM/ARMCM0plus/Source/GCC/gcc_arm.ld + * taken from + * git://github.com/ARM-software/CMSIS + */ + +/* Linker script to configure memory regions. */ +MEMORY +{ + FLASH (rx) + : ORIGIN = 0x00008000, LENGTH = 0x38000 + + RAM (rwx) + : ORIGIN = 0x1fffe000, LENGTH = 0x08000 +} + +/* Library configurations */ +GROUP(libgcc.a libc.a libm.a libnosys.a) + +/* 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 + */ +ENTRY(Reset_Handler) + +SECTIONS +{ + .text : + { + KEEP(*(.vectors)) + __end__ = .; + + *(.text*) + + KEEP(*(.init)) + KEEP(*(.fini)) + + /* .ctors */ + *crtbegin.o(.ctors) + *crtbegin?.o(.ctors) + *(EXCLUDE_FILE(*crtend?.o *crtend.o) .ctors) + *(SORT(.ctors.*)) + *(.ctors) + + /* .dtors */ + *crtbegin.o(.dtors) + *crtbegin?.o(.dtors) + *(EXCLUDE_FILE(*crtend?.o *crtend.o) .dtors) + *(SORT(.dtors.*)) + *(.dtors) + + *(.rodata*) + + KEEP(*(.eh_frame*)) + } > FLASH + + .ARM.extab : + { + *(.ARM.extab* .gnu.linkonce.armextab.*) + } > FLASH + + __exidx_start = .; + .ARM.exidx : + { + *(.ARM.exidx* .gnu.linkonce.armexidx.*) + } > FLASH + __exidx_end = .; + + __etext = .; + + .data : AT (__etext) + { + __data_start__ = .; + *(vtable) + *(.data*) + + . = ALIGN(4); + /* preinit data */ + PROVIDE_HIDDEN (__preinit_array_start = .); + KEEP(*(.preinit_array)) + PROVIDE_HIDDEN (__preinit_array_end = .); + + . = ALIGN(4); + /* init data */ + PROVIDE_HIDDEN (__init_array_start = .); + KEEP(*(SORT(.init_array.*))) + KEEP(*(.init_array)) + PROVIDE_HIDDEN (__init_array_end = .); + + + . = ALIGN(4); + /* finit data */ + PROVIDE_HIDDEN (__fini_array_start = .); + KEEP(*(SORT(.fini_array.*))) + KEEP(*(.fini_array)) + PROVIDE_HIDDEN (__fini_array_end = .); + + KEEP(*(.jcr*)) + . = ALIGN(4); + /* All data end */ + __data_end__ = .; + + } > RAM + + .bss : + { + . = ALIGN(4); + __bss_start__ = .; + *(.bss*) + *(COMMON) + . = ALIGN(4); + __bss_end__ = .; + } > RAM + + .heap (COPY): + { + __HeapBase = .; + __end__ = .; + end = __end__; + KEEP(*(.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 (COPY): + { + KEEP(*(.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") +} diff --git a/src/application/main.rs b/src/application/main.rs new file mode 100644 index 0000000..ca5d1c1 --- /dev/null +++ b/src/application/main.rs @@ -0,0 +1,55 @@ +/* + * Copyright (c) 2019 Tilman Sauerbeck (tilman at code-monkey de) + * + * Permission is hereby granted, free of charge, to any person obtaining + * a copy of this software and associated documentation files (the + * "Software"), to deal in the Software without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sublicense, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE + * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION + * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION + * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + */ + +#![no_std] +#![crate_type="staticlib"] +#[link(name="libcommon.rlib")] + +extern crate common; + +use common::buffer::Buffer; +use common::clock; +use common::systick; +use common::usb_serial; + +extern { + static mut cdc_tx_buf: Buffer; +} + +#[no_mangle] +pub unsafe extern fn main() { + clock::configure(); + systick::init(); + + usb_serial::init(0xf055, 0x635d); + + cdc_tx_buf.write(b"\n"); + cdc_tx_buf.flush(); + + loop { + systick::delay_ms(1000); + + cdc_tx_buf.write(b".\n"); + cdc_tx_buf.flush(); + } +} diff --git a/src/application/start.c b/src/application/start.c new file mode 100644 index 0000000..5363ac0 --- /dev/null +++ b/src/application/start.c @@ -0,0 +1,33 @@ +/* + * Copyright (c) 2019 Tilman Sauerbeck (tilman at code-monkey de) + * + * Permission is hereby granted, free of charge, to any person obtaining + * a copy of this software and associated documentation files (the + * "Software"), to deal in the Software without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sublicense, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE + * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION + * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION + * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + */ + +extern void main(); + +__attribute__((noreturn)) void +_start (void) +{ + main(); + + for (;;) { + } +} -- 2.30.2