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);
}
void Led30_Stop(void) //停止向后传输数据
{
GPIOB->BRR = GPIO_Pin_1;
delay_50us();
delay_50us();
}
