本帖最后由 聿怀嘿嘿 于 2016-1-11 11:11 编辑
虽然意法现在主推HAL库,低功耗L系列的单片机甚至已不再提供标准外设库,HAL的资料越来越丰富,是接下来设计产品的主流,但现在也还有很大一部分工程师继续使用着标准外设库,或是之前项目工程是基于标准库,移植起来也相对方便。STM32F469这块板子ST在HAL库以及提供了DSI LCD部分的相关例程,使用起来真是方便。不过为了适配接下来RTT的移植(RTT是基于标准外设库),只能把HAL库的这部分的程序移植到标准外设库上。 先上两张图看看效果:
首先,是SDRAM的初始化,整体的程序参考标准外设库stm324x9i_eval_fmc_sdram.c文件里的初始化函数,不过由于我们采用RGB565的格式来储存像素点的数据,所以对初始化函数的内容也做相应的改动:SDRAM_MEMORY_WIDTH改为16b的宽度,以对应RGB565的两个字节数据。
- <span style="line-height: 1.5;">FMC_SDRAMInitStructure.FMC_SDMemoryDataWidth =</span><font color="#ff0000" style="line-height: 1.5;"> SDRAM_MEMORY_WIDTH</font><span style="line-height: 1.5;">;</span>
- FMC_SDRAMInitStructure.FMC_InternalBankNumber = FMC_InternalBank_Number_4;
接下来是按照HAL库的初始化顺序,先后对DSI、LTDC初始化
- LCD_Reset();
- DSI_Config();
- LCD_Config();
- DSI_Start(DSI);
- OTM8009Setup(DSI, IMAGEFORMAT_RGB565);
在LCD_Config中,值得注意的是LTDC_CFBStartAdress的设置,这个地址指向了LCD显存的地址,这里用SDRAM来作为显存,RGB565格式下,0xC0000000开始的连续两个地址代表一个像素点的颜色信息,所以打点函数也就是计算位置,往SDRAM中填入相应的颜色信息。
- LTDC_Layer_InitStruct.LTDC_CFBStartAdress = ((uint32_t)0xC0000000);
- /* the length of one line of pixels in bytes + 3 then :
- Line Length = Active high width x number of bytes per pixel + 3
- Active high width = 480
- number of bytes per pixel = 2 (pixel_format : RGB565) */
- LTDC_Layer_InitStruct.LTDC_CFBLineLength = ((480 * 2) + 3);
- /* the pitch is the increment from the start of one line of pixels to the
- start of the next line in bytes, then :
- Pitch = Active high width x number of bytes per pixel */
- LTDC_Layer_InitStruct.LTDC_CFBPitch = (480 * 2);
- /* Configure the number of lines */
- LTDC_Layer_InitStruct.LTDC_CFBLineNumber = 800;
- /* Initializes the Layer */
- LTDC_LayerInit(LTDC_Layer1, <DC_Layer_InitStruct);
- /* Enable Layer 1 */
- LTDC_LayerCmd(LTDC_Layer1, ENABLE);
- /* Reload configuration of Layer 1 */
- LTDC_ReloadConfig(LTDC_IMReload);
- /* Enable The LCD */
- LTDC_Cmd(ENABLE);
SDRAM显存与LCD显示的关系如下图:画得不是很好、呵呵、不过应该能大致了解。
整个屏幕实现横屏和竖屏的效果,由宏定义控制,其中0为横屏,1为竖屏。
- #define OTM_8009_sta 1 //横屏 0 竖屏 1
横屏和竖屏的效果在最底层的打点函数上实现
- #if OTM_8009_sta==0
- *(__IO uint16_t*) (LCD_FB_START_ADDRESS + (2*(Xpos*480 + 480-Ypos))) = RGB_Code;
- #else
- /* Write data value to all SDRAM memory */
- *(__IO uint16_t*) (LCD_FB_START_ADDRESS + (2*(Ypos*480 + Xpos))) = RGB_Code;
- #endif
其他的字符函数、画圆、画矩形函数都是基于上述打点函数,基本是从HAL库直接复制过来,基本不用修改。
- void BSP_LCD_DrawCircle(uint16_t Xpos, uint16_t Ypos, uint16_t Radius)
- {
- int32_t D; /* Decision Variable */
- uint32_t CurX; /* Current X Value */
- uint32_t CurY; /* Current Y Value */
- D = 3 - (Radius << 1);
- CurX = 0;
- CurY = Radius;
- while (CurX <= CurY)
- {
- BSP_LCD_DrawPixel((Xpos + CurX), (Ypos - CurY), DrawProp[ActiveLayer].TextColor);
- BSP_LCD_DrawPixel((Xpos - CurX), (Ypos - CurY), DrawProp[ActiveLayer].TextColor);
- BSP_LCD_DrawPixel((Xpos + CurY), (Ypos - CurX), DrawProp[ActiveLayer].TextColor);
- BSP_LCD_DrawPixel((Xpos - CurY), (Ypos - CurX), DrawProp[ActiveLayer].TextColor);
- BSP_LCD_DrawPixel((Xpos + CurX), (Ypos + CurY), DrawProp[ActiveLayer].TextColor);
- BSP_LCD_DrawPixel((Xpos - CurX), (Ypos + CurY), DrawProp[ActiveLayer].TextColor);
- BSP_LCD_DrawPixel((Xpos + CurY), (Ypos + CurX), DrawProp[ActiveLayer].TextColor);
- BSP_LCD_DrawPixel((Xpos - CurY), (Ypos + CurX), DrawProp[ActiveLayer].TextColor);
- if (D < 0)
- {
- D += (CurX << 2) + 6;
- }
- else
- {
- D += ((CurX - CurY) << 2) + 10;
- CurY--;
- }
- CurX++;
- }
- }
- void BSP_LCD_DisplayStringAt(uint16_t Xpos, uint16_t Ypos, uint8_t *Text, Text_AlignModeTypdef Mode)
- {
- uint16_t refcolumn = 1, i = 0;
- uint32_t size = 0, xsize = 0;
- uint8_t *ptr = Text;
- /* Get the text size */
- while (*ptr++) size ++ ;
- /* Characters number per line */
- xsize = (OTM8009A_800X480_WIDTH/DrawProp[ActiveLayer].pFont->Width);
- switch (Mode)
- {
- case CENTER_MODE:
- {
- refcolumn = Xpos + ((xsize - size)* DrawProp[ActiveLayer].pFont->Width) / 2;
- break;
- }
- case LEFT_MODE:
- {
- refcolumn = Xpos;
- break;
- }
- case RIGHT_MODE:
- {
- refcolumn = - Xpos + ((xsize - size)*DrawProp[ActiveLayer].pFont->Width);
- break;
- }
- default:
- {
- refcolumn = Xpos;
- break;
- }
- }
- /* Check that the Start column is located in the screen */
- if ((refcolumn < 1) || (refcolumn >= 480))//0x8000
- {
- refcolumn = 1;
- }
- /* Send the string character by character on LCD */
- while ((*Text != 0) & (((OTM8009A_800X480_WIDTH - (i*DrawProp[ActiveLayer].pFont->Width)) & 0xFFFF) >= DrawProp[ActiveLayer].pFont->Width))
- {
- /* Display one character on LCD */
- BSP_LCD_DisplayChar(refcolumn, Ypos, *Text);
- /* Decrement the column position by 16 */
- refcolumn += DrawProp[ActiveLayer].pFont->Width;
- /* Point on the next character */
- Text++;
- i++;
- }
- }
STM32F4xx_DSP_StdPeriph_Lib_V1.6.1.zip
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