vdc_api.c

linux嵌入式开发程序

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <linux/fr400cc_vdc.h>

int fd;
unsigned char *vdc_init();
void vdc_close();

/* VDC regs
 * PHTC  RHDC  RHFP  RHSC  RHBP
 * RVTC  RVDC  RVFP  RVSC  RVBP
 * RHIP  RVIP  RCK
 */
static int prms_lcd[13] = {0,320, 10, 1,  10,0,240,10,1, 10,0,0,6};
/*
static int prms_rgb[13] = {858,640,11,67, 60,  1,480,2,4,16,0,0,2};
static int prms_ntsc[13] ={858,720, 4, 4,130,262,240,2,4,16,0,0,4};
*/

unsigned char *vdc_init()
{
	unsigned char *Vram;
	static struct	fr400vdc_config cfg;
	/* open device file */
	if((fd = open("/dev/fr400cc_vdc", O_RDONLY | O_NONBLOCK )) < 0){
		fprintf(stderr, "fd=%d\n", fd);
		exit(-1);
	}

	/*LCD and RGB config*/
	cfg.pix_x = 320;	/*LCD width*/
	cfg.pix_y = 240;	/*LCD height*/
	cfg.pix_sz = 3;		/*byte per pixel*/
	cfg.skipbf = 0;		/* skip bottom field */
	cfg.buf_unit_sz = cfg.pix_x*cfg.pix_y*cfg.pix_sz;	/*buffer size*/
	cfg.buf_num = 2;	/*frame buffer num*/
	cfg.stop_immidiate = 1;
	cfg.rd_count_buf_idx=1; 
	bcopy(prms_lcd, cfg.prm, 4*13);
	cfg.rddl = 1;		/* for underrun */
	cfg.hls   = 0;
	cfg.pal = 0;		/* PAL */
	cfg.cscv  = 0;		/*direct*/
	cfg.dbls = 0;
	cfg.r601 = 0;
	cfg.tfop = 0;
	cfg.dsm  = 0; 
	cfg.dfp  = 0;		/*pack RGB data*/
	cfg.die  = 1;
	cfg.enop = 0;
	cfg.vsop = 0;
	cfg.hsop = 0;
	cfg.dsr = 0;
	cfg.csron = 0;		// cursor
	cfg.dpf  = 1;		/*RGB output*/
	cfg.dms = 3;
	cfg.dma_mode = 3;
	cfg.dma_ats = 2;
	cfg.dma_rs = 1;

	/*mmap buffer*/
	if((Vram = (unsigned char *)mmap(NULL, cfg.buf_unit_sz*cfg.buf_num,
		PROT_READ | PROT_WRITE, MAP_SHARED,fd, 0))
		==(void *)MAP_FAILED){
		fprintf(stderr, "mmap err\n");
		close(fd);
		exit(-1);
	}
	/*set all buffer to 0 (black)*/
	bzero(Vram,cfg.pix_x*cfg.pix_y*3);

	/*set new config to vdc*/
	if(ioctl(fd, VDCIOCSCFG, &cfg) != 0){
		fprintf(stderr, "ioctl set cfg err\n");
		close(fd);
		exit(-1);
	}

	/*start vdc*/
	ioctl(fd,VDCIOCSDAT, 0);
	if(ioctl(fd, VDCIOCSTART, 0) != 0){
		fprintf(stderr, "ioctl start err\n");
		close(fd);
		exit(-1);
	}
	return Vram;
}

void vdc_close()
{
	if(fd>0)
	{
		if(ioctl(fd, VDCIOCSTOP, 0) != 0){
			printf("error stop VDC\n");
			exit(-1);
		}
		close(fd);
	}
}