bmp图像已经顺利读入外扩sram,对于我上传的这种真彩bmp来说,从文件的第54字节开始,之后说颜色数据,格式RGB888,即每3字节表示一个像素,共320x240个像素,正好一屏,另由于我们的屏是65535色,lcd驱动程序中提供的写像素函数需要传入坐标和16位色,因此需要大家写一个把24位色转成16色的函数。大致过程如下:用串口工具往单片机发bmp图片,这样不需要sd卡或u盘,单片机端边读边存入外扩内存,外扩内存共1M字节,我给的bmp文件255k字节。发送完之后,电脑给单片机端发送!END!表示传送结束。单片机开始从外扩内存地址0x68000000的位置,偏移54字节,这54字节是bmp头信息,与本次实验无关,然后开始逐个字节读取,读完3字节,转换为16位色,再依次写入lcd屏上相应位置。
单片机源程序如下:
- #include "led.h"
- #include "key.h"
- #include "beep.h"
- #include "lcd.h"
- #include "usart.h"
- #include "sram.h"
- #include "ds18b20.h"
- #include "ff.h"
- #include "malloc.h"
- #include "sdio_sdcard.h"
- void show_sdcard_info(void)
- {
- switch(SDCardInfo.CardType)
- {
- case SDIO_STD_CAPACITY_SD_CARD_V1_1:printf("Card Type:SDSC V1.1\r\n");break;
- case SDIO_STD_CAPACITY_SD_CARD_V2_0:printf("Card Type:SDSC V2.0\r\n");break;
- case SDIO_HIGH_CAPACITY_SD_CARD:printf("Card Type:SDHC V2.0\r\n");break;
- case SDIO_MULTIMEDIA_CARD:printf("Card Type:MMC Card\r\n");break;
- }
- printf("Card ManufacturerID:%d\r\n",SDCardInfo.SD_cid.ManufacturerID);
- printf("Card RCA:%d\r\n",SDCardInfo.RCA);
- printf("Card Capacity:%d MB\r\n",(u32)(SDCardInfo.CardCapacity>>20));
- printf("Card BlockSize:%d\r\n\r\n",SDCardInfo.CardBlockSize);
- }
-
- void fsmc_sram_test(u16 x,u16 y)
- {
- u32 i=0;
- u8 temp=0;
- u8 sval=0;
- LCD_DisplayString(x,y,16,"Ex Memory Test: 0KB");
- for(i=0;i<1024*1024;i+=4096)
- {
- FSMC_SRAM_WriteBuffer(&temp,i,1);
- temp++;
- }
- for(i=0;i<1024*1024;i+=4096)
- {
- FSMC_SRAM_ReadBuffer(&temp,i,1);
- if(i==0)sval=temp;
- else if(temp<=sval)break;
- LCD_DisplayNum(x+15*8,y,(u16)(temp-sval+1)*4,4,16,0);
- }
- }
- int main(void)
- {
- delay_init(); //初始化延时函数
- LED_Init(); //初始化LED端口
- KEY_Init(); //初始化KEY端口
- BEEP_Init(); //初始化BEEP端口
-
- beep(3);
-
- FSMC_SRAM_Init();
- USART1_Config();
-
- LCD_Init();
- BRUSH_COLOR=RED;
-
- /*
- LCD_DisplayString(30,50,16,"Explorer STM32F4");
- LCD_DisplayString(30,70,16,"SD CARD TEST");
- LCD_DisplayString(30,90,16,"ATOM@ALIENTEK");
- LCD_DisplayString(30,110,16,"2014/5/15");
- LCD_DisplayString(30,130,16,"KEY0:Read Sector 0");
-
- my_mem_init(SRAMIN);
- my_mem_init(SRAMCCM);
-
- */
-
- //LCD_DisplayString(30,130,16,"DS18B20 OK");
-
- /*
- res_sd = f_mount(&fs,"0:",1);
- if(res_sd != FR_OK){
- printf("\r\nPlease insert a SD card formatted by fat32!\r\n");
- }
- */
- //jpgDisplay("0:/1.jpg");
- delay_us(4000);
-
- /*
- while(SD_Init())
- {
- LCD_DisplayString(30,150,16,"SD Card Error!");
- delay_ms(500);
- LCD_DisplayString(30,150,16,"Please Check! ");
- delay_ms(500);
- LED0=!LED0;//DS0??
- }
- show_sdcard_info();
-
- BRUSH_COLOR=BLUE;
-
- LCD_DisplayString(30,150,16,"SD Card OK ");
- LCD_DisplayString(30,170,16,"SD Card Size: MB");
- LCD_DisplayNum(30+13*8,170,SDCardInfo.CardCapacity>>20,5,16,0);
- */
-
- //fsmc_sram_test(10, 10);
-
- while(1)
- {
-
-
- }
- }
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串口发bmp到sram再显示到lcd.rar
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