linux_device_driver/oled_frambuffer/oled_test.c at main · linuxfanfan/linux_device_driver · GitHub

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#include "stdio.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <sys/ioctl.h>
#include <poll.h>
#include <stdint.h>
#include <stdlib.h>
#include <linux/fb.h>

#include "oled_def.h"
#include "font.h"

#define DEV_NAME   "/dev/fb2"

int oled_fd;

void sleep_ms(unsigned int ms)
{
    struct timeval delay;
	delay.tv_sec = 0;
	delay.tv_usec = ms * 1000;
	select(0, NULL, NULL, NULL, &delay);
}


void oled_disp_char(int x, int y, unsigned char c)
{
	int i = 0;
	/* 得到字模 */
	const unsigned char *dots = oled_asc2_8x16[c - ' '];
	char pos[2];
#if 0
	/* 发给OLED */
	OLED_DIsp_Set_Pos(x, y);
	/* 发出8字节数据 */
	for (i = 0; i < 8; i++)
		oled_write_cmd_data(dots[i], OLED_DATA);
#endif
	pos[0] = x;
	pos[1] = y;

	ioctl(oled_fd, CMD_COMBINE(OLED_CMD_SET_XY, 2), &pos);
	ioctl(oled_fd, CMD_COMBINE(OLED_CMD_WRITE_DATAS, 8), dots);

#if 0
	OLED_DIsp_Set_Pos(x, y+1);
	/* 发出8字节数据 */
	for (i = 0; i < 8; i++)
		oled_write_cmd_data(dots[i+8], OLED_DATA);
#endif
	pos[0] = x;
	pos[1] = y+1;
	ioctl(oled_fd, CMD_COMBINE(OLED_CMD_SET_XY, 2), pos);
	ioctl(oled_fd, CMD_COMBINE(OLED_CMD_WRITE_DATAS, 8), &dots[8]);

	// ioctl(fd, OLED_SET_XY, pos);
	// ioctl(fd, OLED_SET_DATAS | (8<<8), &dots[8]);
}

void oled_disp_string(uint8_t x, uint8_t y, char *str)
{
	uint8_t j = 0;

	while (str[j])
	{
		oled_disp_char(x, y, str[j]);  /* 显示单个字符 */
		x += 8;
		if(x > 127)
		{
			x = 0;
			y += 2;
		}
		j++;    /* 移动显示位置 */
	}
}

static void oled_test(void)
{
	oled_disp_string(0, 0, "Sad!");
	oled_disp_string(0, 2, "Bad!");
	oled_disp_string(0, 4, "Moonlight");
}

int main(int argc, char **argv)
{
	struct fb_var_screeninfo var;	/* Current var */
	int screen_size;
	unsigned char *fb_base;
	unsigned int line_width;
	unsigned int pixel_width;
    int ret;

	/* 2. 打开文件 */
	oled_fd = open(DEV_NAME, O_RDWR | O_NONBLOCK);   // | O_NONBLOCK

	if (oled_fd < 0)
	{
		printf("can not open file %s, %d\n", DEV_NAME, oled_fd);
		return -1;
	}

	// short temp;
	// read(oled_fd, &temp, sizeof(temp));
	if (ioctl(oled_fd, FBIOGET_VSCREENINFO, &var))
	{
		printf("can't get var\n");
		return -1;
	}

	printf("OLED Info: %d x %d, %dbpp\r\n", var.xres, var.yres, var.bits_per_pixel);

	line_width  = var.xres * var.bits_per_pixel / 8;
	pixel_width = var.bits_per_pixel / 8;
	screen_size = var.xres * var.yres * var.bits_per_pixel / 8;

	printf("line_width %d, pixel_width %d, screen_size %d\r\n", line_width, pixel_width, screen_size);

	sleep_ms(5000);

	close(oled_fd);

    return 0;
}