void put2lcd(char c, char type)
{
	char c_lo, c_hi;
	c_hi = (c & 0xF0) >> 2; /* Upper 4 bits of c */
	c_lo = (c & 0x0F) << 2; /* Lower 4 bits of c */
	
	if (type == DATA) LCD_DAT |= LCD_RS; /* select LCD data register */
	else LCD_DAT &= (~LCD_RS); /* select LCD command register */

	if (type == DATA)
		LCD_DAT = c_hi|LCD_E|LCD_RS; /* output upper 4 bits, E, RS high */
	else
	LCD_DAT = c_hi|LCD_E; /* output upper 4 bits, E, RS low */
	LCD_DAT |= LCD_E; /* pull E signal to high */
	
	__asm(nop); /* Lengthen E */
	__asm(nop);
	__asm(nop);
	
	LCD_DAT &= (~LCD_E); /* pull E to low */
	
	if (type == DATA)
		LCD_DAT = c_lo|LCD_E|LCD_RS; /* output lower 4 bits, E, RS high */
	else
		LCD_DAT = c_lo|LCD_E; /* output lower 4 bits, E, RS low */

	LCD_DAT |= LCD_E; /* pull E to high */
	
	__asm(nop); /* Lengthen E */
	__asm(nop);
	__asm(nop);

	LCD_DAT &= (~LCD_E); /* pull E to low */
	delay_50us(1); /* Wait for command to execute */
}
void puts2lcd (char *ptr)
{
	while (*ptr) { /* While character to send */
		put2lcd(*ptr,DATA); /* Write data to LCD */
		delay_50us(1); /* Wait for data to be written */
		ptr++; /* Go to next character */
	}
}
/* Write a byte to the LCD in 4 bit mode */
void lcd_write(unsigned char c)
{	if(c & 0x80) LCD_D7=1; else LCD_D7=0;
	if(c & 0x40) LCD_D6=1; else LCD_D6=0;
	if(c & 0x20) LCD_D5=1; else LCD_D5=0;
	if(c & 0x10) LCD_D4=1; else LCD_D4=0;
	LCD_STROBE();
	if(c & 0x08) LCD_D7=1; else LCD_D7=0;
	if(c & 0x04) LCD_D6=1; else LCD_D6=0;
	if(c & 0x02) LCD_D5=1; else LCD_D5=0;
	if(c & 0x01) LCD_D4=1; else LCD_D4=0;
	LCD_STROBE();
	delay_50us();
}
/* Initialise the LCD - put into 4 bit mode */
void lcd_init(void)
{	LCD_RS = 0;	
	LCD_EN = 0;
	delay_100ms();			// Wait 100ms after power applied
	LCD_D4 = 1;		
	LCD_D5 = 1; 
	LCD_STROBE();	
	delay_2ms();			// Wait 6ms
	delay_2ms();
	delay_2ms();
	LCD_STROBE();	
	delay_2ms();
	LCD_STROBE();	
	delay_2ms();
	LCD_D4 = 0;				// Set 4 bit mode
	LCD_STROBE();	
	delay_50us();	
	lcd_cmd(0b00101000);	// Set interface length 4-bit, 2-line, 5x8 dots display
	lcd_cmd(0b00001100);	// Display On, Cursor OFF, Cursor Blink OFF
	lcd_cmd(0b00000110);	// Set entry Mode
	lcd_clear();			// Clear screen
}
/*Delay 2ms */
void delay_2ms(void)
{	unsigned char cnt1;
	for (cnt1=0;cnt1<=34;cnt1++)
	delay_50us();
}
void delay_1ms(int n)
{
	for (;n>0;n--) delay_50us(200);
}
Beispiel #7
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void Led30_Stop(void) //停止向后传输数据
{
	GPIOB->BRR = GPIO_Pin_1;
	delay_50us();
	delay_50us();
}