[ericshliao]

Antartica,

I am trying to create a simple program so that I can call it to do a full-screen refresh in shell. The following code are borrowed from your xepdmgr. I can compile it with gcc without problem, but I haven't really tried it on my iLiad.
Please comment on the following code if it will provide what I want.
Thank you so much.

#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/ioctl.h>

/* ioctl numbers */
#define FBIO_UPLOAD_WAVEFORM 0x40007606
#define FBIO_ERASE_WHITE     0x40087602
#define FBIO_DISPLAY         0x40087601
#define FBIO_DISPLAYPARTIAL  0xfff

/* ioctl structures parameters */
#define WAVEFORM_4BPP_IMAGE       1
#define WAVEFORM_DRAW             4
#define WAVEFORM_FAST_BLACK_WHITE 6
#define WAVEFORM_TYPING           9

/* ioctl structures */
struct display_update_info {
    int waveform;
    int sequence;
};

int main(int argc, char *argv[], char *envp[]){
    struct display_update_info Update;
    int error;
    Update.waveform = WAVEFORM_4BPP_IMAGE;
    Update.sequence = 0;

	int fd;
	if((fd=open("/dev/fb0",O_RDWR))!=-1){
		ioctl(fd, FBIO_ERASE_WHITE, &Update);
	}
    return(0);
}