其实在microwindows的LCD部份与按键类似.
回到 ebrmain.c 中 main() 函数中.
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int main()
{
GR_EVENT event;
if (GrOpen() < 0) {
fprintf (stderr, "GrOpen failed");
return 0;
}
...
...
...
return 0;
}
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LCD 的初始化也是在GrOpen() 中实现的.
GrOpen->GsInitialize->GdOpenScreen
GdOpenScreen 在 src/engine/devopen.c 中定义.
现在分析一下 GdOpenScreen() 这个函数
/**
* Open low level graphics driver.
*
* @return The screen drawing surface.
*/
PSD
GdOpenScreen(void)
{
PSD psd;
MWPALENTRY * stdpal;
MWSCREENINFO sinfo;
psd = scrdev.Open(&scrdev);
if (!psd)
return NULL;
...
...
} |
GrOpen->GsInitialize->GdOpenScreen->scrdev.Open
首先调用 scrdev.Open 进行初始化操作, scrdev 初始化在 src/drivers/scr_fb.c 文件中, 对 open, close, getscreeninfo, ...,ShowWindow, SaveImage等函数进行初始化操作.
GrOpen->GsInitialize->GdOpenScreen->scrdev.Open->Open
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/* local functions*/
/* init framebuffer*/
static PSD open(PSD psd)
{
psd->xres = psd->xvirtres = WIDTH;
psd->yres = psd->yvirtres = HEIGHT;
psd->planes = PLANES;
psd->bpp = BITCOUNT;
psd->ncolors = (psd->bpp >= 24)? (1 << 24): (1 << psd->bpp); // colors count
psd->linelen = psd->xvirtres;
psd->addr = bmpdata;
psd->size = MEMSIZE;
psd->pixtype = MWPF_TRUECOLOR888;
memset(psd->addr,0x00,psd->size);
psd->portrait = MWPORTRAIT_NONE;
/* !EMBEDDEDPLANET*/
psd->flags = PSF_SCREEN | PSF_HAVEBLIT;
if (psd->bpp == 16)
psd->flags |= PSF_HAVEOP_COPY;
status = 2;
open_panel();
return psd; /* success*/
}
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在 open 函数里对 LCD的一些参数进行了配置.
GrOpen->GsInitialize->GdOpenScreen->scrdev.Open->Open->open_panel
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void open_panel()
{
pio_fd = open ("/dev/fb0", O_RDONLY | O_NONBLOCK);
}
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open_panel 只是打开一个设备文件.
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