stm32f42_discovery_demo
所属分类：处理器开发
开发工具：D
文件大小：15167KB
下载次数：0
上传日期：2019-02-08 23:52:04
上 传 者：
sh-1993
说明： 使用D对STM32F29I Discovery板进行裸机编程的简单演示
(A simple demonstration of using D to bare-metal program an STM32F29I Discovery board)
文件列表:
LICENSE (34916, 2019-02-09)
build.d (2742, 2019-02-09)
gdb.sh (182, 2019-02-09)
images (0, 2019-02-09)
images\cross-referencing.png (197784, 2019-02-09)
images\teaser.jpg (613972, 2019-02-09)
images\teaser.mp4 (15210387, 2019-02-09)
images\tooling.png (117447, 2019-02-09)
linker (0, 2019-02-09)
linker\linker.ld (3332, 2019-02-09)
openocd.sh (41, 2019-02-09)
source (0, 2019-02-09)
source\board (0, 2019-02-09)
source\board\ILI9341.d (5708, 2019-02-09)
source\board\lcd.d (1412, 2019-02-09)
source\board\ltdc.d (10514, 2019-02-09)
source\board\package.d (6006, 2019-02-09)
source\board\random.d (997, 2019-02-09)
source\board\spi5.d (2371, 2019-02-09)
source\board\statusLED.d (567, 2019-02-09)
source\main.d (1392, 2019-02-09)
source\runtime (0, 2019-02-09)
source\runtime\core (0, 2019-02-09)
source\runtime\core\bitop.d (2949, 2019-02-09)
source\runtime\exception.d (663, 2019-02-09)
source\runtime\gcc (0, 2019-02-09)
source\runtime\gcc\attribute.d (172, 2019-02-09)
source\runtime\gcc\builtins.d (1956, 2019-02-09)
source\runtime\object.d (942, 2019-02-09)
source\stm32f42 (0, 2019-02-09)
source\stm32f42\bus.d (1413, 2019-02-09)
source\stm32f42\dma2d.d (34562, 2019-02-09)
source\stm32f42\flash.d (18427, 2019-02-09)
source\stm32f42\gpio.d (73252, 2019-02-09)
source\stm32f42\ltdc.d (49553, 2019-02-09)
source\stm32f42\mmio.d (27328, 2019-02-09)
source\stm32f42\nvic.d (227336, 2019-02-09)
... ...
# stm32f42_discovery_demo
A simple demonstration of using D to bare-metal program an [STM32F29I Discovery Board](http://www.st.com/web/catalog/tools/FM116/SC959/SS1532/PF259090)
[Download Video](https://raw.githubusercontent.com/JinShil/stm32f42_discovery_demo/master/images/teaser.mp4)
## Build
Run `rdmd build.d -c=gdc` to build with GDC. You will need a [GDC ARM cross compiler](https://github.com/JinShil/arm-none-eabi-gdc).
Run `rdmd build.d -c=ldc` to build with LDC. You can use one of the downloads from the [LDC releases](https://github.com/ldc-developers/ldc/releases).
You need to install dmd and dtools (for `rdmd`), arm-none-eabi-gcc (for `arm-none-eabi-gdb`), and openocd from your Linux distribution's package manager.
## The Good
* It works!
* No CRT startup files, libgcc, libc, or vendor's C peripheral libraries were used. *EVERYTHING* is in D.
* `@safe` and `-dip1000` compatible
* No Stinking `-betterC`. If you don't want the overhead of a certain feature of D, don't use it.
* [Compile-time enforcement of register/bitfield mutability](https://github.com/JinShil/stm32f42_discovery_demo/blob/c324bbf861cf258a819478481521528fca88dcb3/source/stm32f42/mmio.d#L244-L275)
* [Compile-time optimization of MMIO register access](https://github.com/JinShil/stm32f42_discovery_demo/blob/c324bbf861cf258a819478481521528fca88dcb3/source/stm32f42/mmio.d#L417-L437) by turning byte- and half-word-aligned accesses into single, atomic reads/writes. Single-bit bitfields are optimized at compile time to use ARM's bitbanding feature for atomic access. This increases performance, reduces code size, and is all abstracted from the user.
* [Setting multiple bit fields in a register with a single read-modify-write](https://github.com/JinShil/stm32f42_discovery_demo/blob/c324bbf861cf258a819478481521528fca88dcb3/source/stm32f42/mmio.d#L665-L671)
```D
with(GPIOA.MODER)
{
setValue
!(
MODER3, 0b10 // Alternate function mode
, MODER4, 0b10
, MODER6, 0b10
, MODER11, 0b10
, MODER12, 0b10
);
}
```
* Seems to be pretty fast, but I still need to verify the generated code to ensure optimizations are being performed properly
* Small Code Size (3k). The data in the BSS segment is my LCD's frame buffer, so that really doesn't count.
Optimized for size
```
text data bss dec hex filename
3124 0 153600 156700 2***1c binary/firmware
```
Optimized for speed
```
text data bss dec hex filename
5888 0 153600 159488 26f00 binary/firmware
```
* The code resembles the register descriptions in the STM32 reference manual for easy cross-referencing.
* Good integration with tooling. e.g Register descriptions in DDoc popups, and register layout in outline and code completion windows. In other words, the code *is* the datasheet.
## The Bad
* [The implementation of D runtime](https://github.com/JinShil/stm32f42_discovery_demo/tree/master/source/runtime) is minimal, and therefore incomplete, but a C-like subset of D (inline assembly, structs, templates, mixins, and even static classes) is available.
## The Ugly
* I didn't put much diligence and care into some of the code, because I was anxious to just get something to appear on the LCD screen. There are a lot of magic numbers that should be enums, and there is no hardware abstraction layer - the program directly manipulates the memory-mapped IO registers. There are also some static asserts that should be added for compile-time sanity checks. Lots of refactoring and code quality improvements still need to be done.
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