application: Add humble beginnings of the application code.

This is just a USB serial hello world right now.

diff --git a/SConscript.target b/SConscript.target
index b5eb085628154436ba9ed7dae9d4239dc0ffd62d..b42eecef5f6166c51d73698c4abfe52e89e679db 100644 (file)
--- 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 (file)
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 (file)
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 (file)
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 (;;) {
+       }
+}