自学教程：C++ write_cmd函数代码示例

void set_orientation(orientation o){	display.orient = o;	write_cmd(MEMORY_ACCESS_CONTROL);	if (o==North) { 		display.width = LCDWIDTH;		display.height = LCDHEIGHT;		write_data(0x48);	}	else if (o==West) {		display.width = LCDHEIGHT;		display.height = LCDWIDTH;		write_data(0xE8);	}	else if (o==South) {		display.width = LCDWIDTH;		display.height = LCDHEIGHT;		write_data(0x88);	}	else if (o==East) {		display.width = LCDHEIGHT;		display.height = LCDWIDTH;		write_data(0x28);	}	write_cmd(COLUMN_ADDRESS_SET);	write_data16(0);	write_data16(display.width-1);	write_cmd(PAGE_ADDRESS_SET);	write_data16(0);	write_data16(display.height-1);}

/************************************************************   函数名称：*   功能描述：   OLED设置坐标*   参数列表：*   返回结果：*   备    注：***********************************************************/void OLED_SSD1306::set_xy(uint16_t x, uint16_t y){    write_cmd(0xb0 + y);    write_cmd(((x & 0xf0) >> 4) | 0x10);    write_cmd((x & 0x0f) | 0x01);}

void ili9341fb_set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye){    uint8_t xsl, xsh, xel, xeh, ysl, ysh, yel, yeh;    u16 *p = (u16 *)par->buf;    int i = 0;    fbtft_dev_dbg(DEBUG_SET_ADDR_WIN, par->info->device, "%s(xs=%d, ys=%d, xe=%d, ye=%d)/n", __func__, xs, ys, xe, ye);    xsl = (uint8_t)(xs & 0xff);    xsh = (uint8_t)((xs >> 8) & 0xff);    xel = (uint8_t)(xe & 0xff);    xeh = (uint8_t)((xe >> 8) & 0xff);    ysl = (uint8_t)(ys & 0xff);    ysh = (uint8_t)((ys >> 8) & 0xff);    yel = (uint8_t)(ye & 0xff);    yeh = (uint8_t)((ye >> 8) & 0xff);    write_cmd(par, FBTFT_CASET);    write_data(par, xsh);    write_data(par, xsl);    write_data(par, xeh);    write_data(par, xel);    write_cmd(par, FBTFT_RASET);    write_data(par, ysh);    write_data(par, ysl);    write_data(par, yeh);    write_data(par, yel);    write_cmd(par, FBTFT_RAMWR);    write_flush(par);}

static int32_t conax_do_emm(struct s_reader * reader, EMM_PACKET *ep){  def_resp;  unsigned char insCA[]  = { 0xDD,0xCA,0x00,0x00,0x00 };  unsigned char insEMM[] = { 0xDD,0x84,0x00,0x00,0x00 };  unsigned char buf[255];  int32_t rc=0;  const int32_t l = ep->emm[2];  insEMM[4]=l+5;  buf[0]=0x12;  buf[1]=l+3;  memcpy(buf+2, ep->emm, buf[1]);  write_cmd(insEMM, buf);  if (cta_res[0] == 0x98) {    insCA[4] = cta_res[1];    write_cmd(insCA, NULL);  }  rc=((cta_res[0]==0x90)&&(cta_res[1]==0x00));  if (rc)    return OK;  else    return ERROR;}

void display_char(char c){	uint16_t x, y;	PGM_P fdata; 	uint8_t bits, mask;	uint16_t sc=display.x, ec=display.x + 4, sp=display.y, ep=display.y + 7;	if (c < 32 || c > 126) return;	fdata = (c - ' ')*5 + font5x7;	write_cmd(PAGE_ADDRESS_SET);	write_data16(sp);	write_data16(ep);	for(x=sc; x<=ec; x++) {		write_cmd(COLUMN_ADDRESS_SET);		write_data16(x);		write_data16(x);		write_cmd(MEMORY_WRITE);		bits = pgm_read_byte(fdata++);		for(y=sp, mask=0x01; y<=ep; y++, mask<<=1)			write_data16((bits & mask) ? display.foreground : display.background);	}	write_cmd(COLUMN_ADDRESS_SET);	write_data16(x);	write_data16(x);	write_cmd(MEMORY_WRITE);	for(y=sp; y<=ep; y++)		write_data16(display.background);	display.x += 6;	if (display.x >= display.width) { display.x=0; display.y+=8; }}

	LLDSPEC void gdisp_lld_flush(GDisplay *g) {		uint8_t * ram;		unsigned pages;		// Don't flush if we don't need it.		if (!(g->flags & GDISP_FLG_NEEDFLUSH))			return;		ram = RAM(g);		pages = GDISP_SCREEN_HEIGHT/8;		acquire_bus(g);		write_cmd(g, SSD1306_SETSTARTLINE | 0);		while (pages--) {			#if SSD1306_SH1106				write_cmd(g, SSD1306_PAM_PAGE_START + (7 - pages));				write_cmd(g, SSD1306_SETLOWCOLUMN + 2);				write_cmd(g, SSD1306_SETHIGHCOLUMN);			#endif			write_data(g, ram, SSD1306_PAGE_WIDTH);			ram += SSD1306_PAGE_WIDTH;		}		release_bus(g);		g->flags &= ~GDISP_FLG_NEEDFLUSH;	}

void tdisp_lld_control(uint16_t what, void *value) {	switch(what) {		case TDISP_CTRL_BACKLIGHT:			if ((uint8_t)value)				displaycontrol |= DISPLAY_ON;			else				displaycontrol &= ~DISPLAY_ON;			write_cmd(0x08 | displaycontrol);			break;		case TDISP_CTRL_CURSOR:			switch((cursorshape)value) {			case cursorOff:				displaycontrol &= ~CURSOR_ON;				break;			case cursorBlock:			case cursorUnderline:			case cursorBar:				displaycontrol = (displaycontrol | CURSOR_ON) & ~CURSOR_BLINK;				break;			case cursorBlinkingBlock:			case cursorBlinkingUnderline:			case cursorBlinkingBar:			default:				displaycontrol |= (CURSOR_ON | CURSOR_BLINK);				break;			}			write_cmd(0x08 | displaycontrol);			break;	}}

//关闭OLED显示void OLED_Display_Off(void){	write_cmd(0X8D);  //SET DCDC命令	write_cmd(0X10);  //DCDC OFF	write_cmd(0XAE);  //DISPLAY OFF	Set_OLED_VDD;	Set_OLED_VBAT;}

void goxy(unsigned char y,unsigned char x){	if(y==1)		write_cmd(0x80|x);	if(y==2)		write_cmd(x-(0x40));}

static int blank(struct fbtft_par *par, bool on){	fbtft_dev_dbg(DEBUG_BLANK, par->info->device, "%s(blank=%s)/n", __func__, on ? "true" : "false");	if (on)		write_cmd(par, 0xAE);	else		write_cmd(par, 0xAF);	return 0;}

void lcd_l602init()//1602初始化{	EN=0;	write_cmd(0x38);//设置16*2显示		write_cmd(0x0c);//显示器开，光标开	write_cmd(0x06);//写一个字符后地址加1	write_cmd(0x01);//显示清0,DPTR清0}

/* Write display control commands to the display */void tdisp_lld_control(uint16_t what, uint16_t value) {	switch(what) {		      case TDISP_CTRL_DISPLAY:				switch (value) {					case displayOff:						displaycontrol &= ~TDISP_DISPLAY_ON;						break;					case displayOn:						displaycontrol |= TDISP_DISPLAY_ON;						break;				}				write_cmd(0x08 | displaycontrol);				break;		      case TDISP_CTRL_CURSOR:				switch (value) {					case cursorBlinkingBlock:					case cursorBlinkingUnderline:					case cursorBlinkingBar:						displaycontrol |= TDISP_CURSOR_ON + TDISP_CURSOR_BLINK;						break;					case cursorBlock:					case cursorUnderline:					case cursorBar:						displaycontrol = (displaycontrol | TDISP_CURSOR_ON) & ~TDISP_CURSOR_BLINK;						break;					case cursorOff:					default:						displaycontrol &= ~(TDISP_CURSOR_ON | TDISP_CURSOR_BLINK); // zet alleen de cursor uit. Bewaar de overige instellingen						break;				}				write_cmd(0x08 | displaycontrol);				break;			case TDISP_CTRL_MOVE:				switch (value) {					case cursorIncrease:						cursorcontrol |= TDISP_CURSOR_INC; // increase cursor position						break;					case cursorDecrease:						cursorcontrol &= ~TDISP_CURSOR_INC; // decrease cursor position						break;				}				write_cmd(0x04 | cursorcontrol);				break;			case TDISP_CTRL_SHIFT:				switch (value) {					case shiftOn:						cursorcontrol |= TDISP_SHIFT_ON;						break;					case shiftOff:						cursorcontrol &= ~TDISP_SHIFT_ON;						break;				}				write_cmd(0x04 | cursorcontrol);				break;	}}

/*-----------------------------------------------------------------------LCD_clear         : LCD清屏函数-----------------------------------------------------------------------*/void NOKIA5110::clear(void)  {    unsigned int i = 0;    write_cmd(0x0c);			    write_cmd(0x80);			    for (i=0; i<504; i++)      write_data(0);			  }

/*LCD?????*/void lcd_init(){	LCD_PSB=1;	write_cmd(0x30);	delay_1ms(5);	write_cmd(0x0C);	delay_1ms(5);	write_cmd(0x01);	delay_1ms(5);}

	LLDSPEC	void gdisp_lld_write_start(GDisplay *g) {		acquire_bus(g);		write_cmd(g, SSD1327_SET_COLUMN_ADDRESS);		write_data(g, g->p.x);		write_data(g, g->p.x + g->p.cx - 1);		write_cmd(g, SSD1327_SET_ROW_ADDRESS);		write_data(g, g->p.y);		write_data(g, g->p.y + g->p.cy - 1);		write_cmd(g, SSD1327_WRITE_RAM);	}

void nokia_lcd_render(void){	register unsigned i;	/* Set column and row to 0 */	write_cmd(0x80);	write_cmd(0x40);	/* Write screen to display */	for (i = 0; i < 504; i++)		write_data(nokia_lcd.screen[i]);}

//更新显存到LCDvoid OLED_Refresh_Gram(void){	u8 i,n;	for(i=0;i<8;i++)	{		write_cmd (0xb0+i);    //设置页地址（0~7）		write_cmd (0x02);      //设置显示位置
C++ write_command函数代码示例
C++ write_char函数代码示例