bmp.c

摄像头与avr单片机的接口

/*
 * ----------------------------------------------------------------------------
 * BMP Lybrary
 *
 * By I馻ki Navarro Oiza
 * April 2004
 * ----------------------------------------------------------------------------
 */
 
#include "bmp.h"


void createheader(char *header, int heigh, int width){
  char *p;
  char bytelow;
  char bytehigh;
  int sizefile = 1078 +(heigh*width);
  bytelow = sizefile & 0x00FF;
  bytehigh = (sizefile & 0xFF00)>>8;
  p = header;
  
  //2 Bytes --BM Starting
  *p = 'B';
  p++;
  *p = 'M';
  p++;
  //4 Bytes -- Size of file in bytes = 14 + 40 +1024 + HEIGH * WIDTH (100*100) = 2078 = 0x049A
  *p = bytelow;
  p++;
  *p = bytehigh;
  p++; 
  *p = 0;
  p++;
  *p = 0;
  p++;
  //4 Bytes of reserved (= 0)
  *p = 0;
  p++;
  *p = 0;
  p++;
  *p = 0;
  p++;
  *p = 0;
  p++;
  //4 Bytes of offset to the init of the data
  *p = 0x36;
  p++; 
  *p = 0x04;
  p++;
  *p = 0;
  p++;
  *p = 0;
  p++;
  
}

void createinfoheader(char *infoheader, int heigh, int width){
  char *p;
  char heighlow;
  char heighhigh;
  char widthlow;
  char widthhigh;
  
  heighlow = heigh & 0x00FF;
  heighhigh = (heigh & 0xFF00)>>8;
  widthlow = width & 0x00FF;
  widthhigh = (width & 0xFF00)>>8;
  
  p = infoheader;
  
  //4 Bytes -- Size of InfoHeader =40 
  *p = 40;
  p++; 
  *p = 0;
  p++;
  *p = 0;
  p++;
  *p = 0;
  p++;
  //4 Bytes -- specifies the width of the image, in pixels.
  *p = widthlow;
  p++; 
  *p = widthhigh;
  p++;
  *p = 0;
  p++;
  *p = 0;
  p++;
  //4 Bytes -- specifies the heigth of the image, in pixels.
  *p = heighlow;
  p++;
  *p = heighhigh;
  p++;
  *p = 0;
  p++;
  *p = 0;
  p++;
  //2 Bytes -- Number of planes of the image
  *p = 1;
  p++;
  *p = 0;
  p++;
  //2 Bytes Bits per Pixel  -- In our case 8.
  *p = 8;
  p++;
  *p = 0;
  p++;
  //4 bytes -- Type of Compression 0 = BI_RGB   no compression   
  *p = 0;
  p++;
  *p = 0;
  p++;
  *p = 0;
  p++;
  *p = 0;
  p++;
  //4 bytes -- ImageSize  (compressed) It is valid to set this =0 
  *p = 0;
  p++;
  *p = 0;
  p++;
  *p = 0;
  p++;
  *p = 0;
  p++;
  //XpixelsPerM 4 bytes horizontal resolution: Pixels/meter 
  *p = 0;
  p++;
  *p = 0;
  p++;
  *p = 0;
  p++;
  *p = 0;
  p++;
  //YpixelsPerM 4 bytes vertical resolution: Pixels/meter 
  *p = 0;
  p++;
  *p = 0;
  p++;
  *p = 0;
  p++;
  *p = 0;
  p++;
  //ColorsUsed 4 bytes Number of actually used colors =256
  *p = 0;
  p++;
  *p = 1;
  p++;
  *p = 0;
  p++;
  *p = 0;
  p++;
  //ColorsImportant 4 bytes Number of important colors  0 = all 
  *p = 0;
  p++;
  *p = 0;
  p++;
  *p = 0;
  p++;
  *p = 0;
  p++;
}

void usart_putnumchars(char *header, int num){
  char *p;
  p = header;
  for(int i=0; i<num;i++){
    usart_putc(*p);
    p++;
  }

}

void sendtable(void){
  for(int i=0; i<256;i++){
    usart_putc(i);
	usart_putc(i);
	usart_putc(i);
	usart_putc(0);
  }

}
void senddata(void){
  for(int i=0; i<244;i++){
    for(int j=0; j<44;j++){
    usart_putc(0+5*j);
	usart_putc(10+5*j);
	usart_putc(20+5*j);
	usart_putc(0+2*i);
	usart_putc(50+2*i);
	usart_putc(0+9*j);
	usart_putc(10+9*j);
	usart_putc(20+9*j);
	}
  }

}