# 成功大學資訊工程學系進階嵌入式系統課程 Week#3 Lab39 (macOS 環境版)
###### tags: `embedded`
## Developing Environment

Note: 因為是一段時間以前就安裝好 STM32 porting environment 的，因此[Ubuntu 版本](http://embedded2015.hackpad.com/Week3-Lab39-ni3tzoIax7Y)前幾個步驟忘了有沒有)，參考：http://wiki.csie.ncku.edu.tw/embedded/freertos#測試環境架設 之 `OS X 上安裝 gcc-arm-none-eabi、stlink、openocd`

* 作業系統：macOS (OS X) 10.12.2
* 取得 GNU Toolchain：

**gcc-arm-none-eabi**

$ brew tap PX4/homebrew-px4
$ brew update
$ brew install gcc-arm-none-eabi

# 使用：$ arm-none-eabi-gcc

**libenewlib-arm-none-eabi**
`brew install libnewlib-arm-none-eabi`

<hr>

(2018-10-04)
如果發生：`No available formula with the name "libnewlib-arm-none-eabi"`，上網找不太到資料，試著直接 ./configure

這次重建環境沒辦法成功安裝 libnewlib-arm-none-eabi 後：

↪ ./configure --disable-werror --enable-debug \
      --target-list="arm-softmmu" \
      --extra-cflags=-DSTM32_UART_NO_BAUD_DELAY \
      --extra-cflags=-DSTM32_UART_ENABLE_OVERRUN \
      --disable-gtk

ERROR: glib-2.12 gthread-2.0 is required to compile QEMU

> brew install glib



↪ ./configure --disable-werror --enable-debug \
      --target-list="arm-softmmu" \
      --extra-cflags=-DSTM32_UART_NO_BAUD_DELAY \
      --extra-cflags=-DSTM32_UART_ENABLE_OVERRUN \
      --disable-gtk

ERROR: pixman not present. Your options:
         (1) Preferred: Install the pixman devel package (any recent
             distro should have packages as Xorg needs pixman too).
         (2) Fetch the pixman submodule, using:
             git submodule update --init pixman

> git submodule update --init pixman
 
↪ ./configure --disable-werror --enable-debug \
      --target-list="arm-softmmu" \
      --extra-cflags=-DSTM32_UART_NO_BAUD_DELAY \
      --extra-cflags=-DSTM32_UART_ENABLE_OVERRUN \
      --disable-gtk
ld: unknown option: --verbose
Install prefix    /usr/local
BIOS directory    /usr/local/share/qemu
binary directory  /usr/local/bin
library directory /usr/local/lib
module directory  /usr/local/lib/qemu
libexec directory /usr/local/libexec
include directory /usr/local/include
config directory  /usr/local/etc
local state directory   /usr/local/var
Manual directory  /usr/local/share/man
ELF interp prefix /usr/gnemul/qemu-%M
Source path       /Users/veckh/Desktop/workspace/qemu_stm32
C compiler        cc
Host C compiler   cc
C++ compiler      c++
Objective-C compiler clang
ARFLAGS           rv
CFLAGS            -D_REENTRANT -I/usr/local/Cellar/glib/2.58.1/include/glib-2.0 -I/usr/local/Cellar/glib/2.58.1/lib/glib-2.0/include -I/usr/local/opt/gettext/include -I/usr/local/Cellar/pcre/8.42/include -g
QEMU_CFLAGS       -m64 -DOS_OBJECT_USE_OBJC=0 -arch x86_64 -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -Wstrict-prototypes -Wredundant-decls -Wall -Wundef -Wwrite-strings -Wmissing-prototypes -fno-strict-aliasing -fno-common -DSTM32_UART_ENABLE_OVERRUN -DSTM32_UART_NO_BAUD_DELAY  -Wno-string-plus-int -Wno-initializer-overrides -Wendif-labels -Wmissing-include-dirs -Wempty-body -Wnested-externs -Wformat-security -Wformat-y2k -Winit-self -Wignored-qualifiers -Wold-style-definition -Wtype-limits -fstack-protector-strong  -I$(SRC_PATH)/pixman/pixman -I$(BUILD_DIR)/pixman/pixman -I$(SRC_PATH)/dtc/libfdt
LDFLAGS           -m64 -framework CoreFoundation -framework IOKit -arch x86_64 -g
make              make
install           install
python            python -B
smbd              /usr/sbin/smbd
module support    no
host CPU          x86_64
host big endian   no
target list       arm-softmmu
tcg debug enabled yes
gprof enabled     no
sparse enabled    no
strip binaries    no
profiler          no
static build      no
Cocoa support     yes
pixman            internal
SDL support       no
GTK support       no
VTE support       no
curses support    yes
curl support      yes
mingw32 support   no
Audio drivers     coreaudio
Block whitelist (rw)
Block whitelist (ro)
VirtFS support    no
VNC support       yes
VNC TLS support   no
VNC SASL support  yes
VNC JPEG support  no
VNC PNG support   no
VNC WS support    no
xen support       no
brlapi support    no
bluez  support    no
Documentation     yes
GUEST_BASE        yes
PIE               no
vde support       no
netmap support    no
Linux AIO support no
ATTR/XATTR support no
Install blobs     yes
KVM support       no
RDMA support      no
TCG interpreter   no
fdt support       yes
preadv support    no
fdatasync         no
madvise           yes
posix_madvise     yes
sigev_thread_id   no
uuid support      yes
libcap-ng support no
vhost-net support no
vhost-scsi support no
Trace backends    nop
spice support     no
rbd support       no
xfsctl support    no
nss used          no
libusb            no
usb net redir     no
GLX support       no
libiscsi support  no
libnfs support    no
build guest agent yes
QGA VSS support   no
seccomp support   no
coroutine backend sigaltstack
coroutine pool    yes
GlusterFS support no
virtio-blk-data-plane no
gcov              gcov
gcov enabled      no
TPM support       yes
libssh2 support   no
TPM passthrough   no
QOM debugging     yes
vhdx              yes
Quorum            no
lzo support       no
snappy support    no
NUMA host support no

之後繼續跑教學指令沒問題，但 warning 好像變多...

<hr>

## STM32 in QEMU

>>> mkdir -p workspace
>>> cd workspace
>>> git clone git://github.com/beckus/stm32_p103_demos.git 
>>> git clone git://github.com/beckus/qemu_stm32.git
>>> cd qemu_stm32
>>> git submodule update --init dtc
>>> ./configure --disable-werror --enable-debug \
    --target-list="arm-softmmu" \
    --extra-cflags=-DSTM32_UART_NO_BAUD_DELAY \
    --extra-cflags=-DSTM32_UART_ENABLE_OVERRUN \
    --disable-gtk
>>> make
>>> cd ../stm32_p103_demos
>>> make all
>>> make blink_flash_QEMURUN

上述步驟成功畫面

`make button_QEMURUN`

如果滑鼠點到 QEMU emulator 視窗，會進入視窗畫面而鎖定滑鼠，按 `command + alt` 可以 release

## FreeRTOS on STM32

git clone https://github.com/fbukevin/freertos-basic.git
cd freertos-basic
make
make qemu


* Discover: `前面階段中的 qemu emulator 敘述跑到 terminal 了`
* Problem: `在 qemu emulator 中 keyboard 無法輸入`

原因是在 fio.c 中 fio_read function 的這一段：

    if (fio_fds[fd].fdread) {
        r = fio_fds[fd].fdread(fio_fds[fd].opaque, buf, count);
    } else {
        r = -3;
    }

其中的 fio_fds[fd].fdread() 沒有作用

in fio.h, we defined:

    typedef ssize_t (*fdread_t)(void * opaque, void * buf, size_t count);

and we assign this poiter in fio.c in fio_init():

    fio_fds[0].fdread = stdin_read;

so that we know whenever we called like this:

    r = fio_fds[fd].fdread(fio_fds[fd].opaque, buf, count);

it's equivalent to call:

    r = fio_fds[fd].stdin_read(fio_fds[fd].opaque, buf, count);

and we can find the implementation of stdin_read() in fio.c:

    static ssize_t stdin_read(void * opaque, void * buf, size_t count) {
        ...
    }

in stdin_read, we found inputs are completed by function recv_byte() which is defined in main.c:

    char recv_byte()
    {
        USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
        char msg;
        while(!xQueueReceive(serial_rx_queue, &msg, portMAX_DELAY));
        return msg;
    }

after tracing to here, we found that function `xQueueReceive()` which is not in freertos-basic/src is the problem cause input disabled.

* 另外一個可能是，當使用 make qemu，會出現：

    (process:68826): GLib-WARNING **: gmem.c:482: custom memory allocation vtable not supported

很有可能是這個造成的

* 還有一個可能，用 make qemudbg 發現在 main.c 的 init_rs232() 就有 error，可能是因為 rs232 的初始化失敗，而 rs232 是負責 I/O 的

    Error while running hook_stop:
    No symbol "disassembly" in current context.
    Reset_Handler () at freertos/libraries/CMSIS/CM3/DeviceSupport/ST/STM32F10x/startup/gcc_ride7/startup_stm32f10x_md.s:67
    67	  movs	r1, #0
    Breakpoint 1 at 0x1686: file src/main.c, line 162.
    Error while running hook_stop:
    No symbol "disassembly" in current context.

    Breakpoint 1, main () at src/main.c:162
    162		init_rs232();
    gdb$ 

目前實驗至此終止了！#