之前使用P1.4到P1.7作为数据输出到LCD我已经成功但是通过改变引脚即P1.2到P1.5作为我的数据输出引脚到LCD,它就不起作用了。这是什么问题,谢谢,下面是我的代码。
#define CMD 0
#define DATA 1
#define LCD_OUT P1OUT
#define LCD_DIR P1DIR
#define D4 BIT4
#define D5 BIT5
#define D6 BIT6
#define D7 BIT7
#define RS BIT2
#define EN BIT3
// Delay function for producing delay in 0.1 ms increments
void delay(uint8_t t)
{
uint8_t i;
for(i=t; i > 0; i--)
__delay_cycles(100);
}
// Function to pulse EN pin after data is written
void pulseEN(void)
LCD_OUT |= EN;
delay(1);
LCD_OUT &= ~EN;
//Function to write data/command to LCD
void lcd_write(uint8_t value uint8_t mode)
if(mode == CMD)
LCD_OUT &= ~RS; // Set RS -> LOW for Command mode
else
LCD_OUT |= RS; // Set RS -> HIGH for Data mode
LCD_OUT = ((LCD_OUT & 0x0F) | (value & 0xF0)); // Write high nibble first
pulseEN();
LCD_OUT = ((LCD_OUT & 0x0F) | ((value << 4) & 0xF0)); // Write low nibble next
// Function to print a string on LCD
void lcd_print(char *s)
while(*s)
lcd_write(*s DATA);
s++;
// Function to move cursor to desired position on LCD
void lcd_setCursor(uint8_t row uint8_t col)
const uint8_t row_offsets[] = { 0x00 0x40};
lcd_write(0x80 | (col + row_offsets[row]) CMD);
// Initialize LCD
void lcd_init()
//P2SEL &= ~(BIT6+BIT7);
LCD_DIR |= (D4+D5+D6+D7+RS+EN);
LCD_OUT &= ~(D4+D5+D6+D7+RS+EN);
delay(150); // Wait for power up ( 15ms )
lcd_write(0x33 CMD); // Initialization Sequence 1
delay(50); // Wait ( 4.1 ms )
lcd_write(0x32 CMD); // Initialization Sequence 2
delay(1); // Wait ( 100 us )
// All subsequent commands take 40 us to execute except clear & cursor return (1.64 ms)
lcd_write(0x28 CMD); // 4 bit mode 2 line
lcd_write(0x0F CMD); // Display ON Cursor ON blink ON
lcd_write(0x01 CMD); // Clear screen
delay(20);
lcd_write(0x06 CMD); // Auto Increment Cursor
lcd_setCursor(00); // Goto Row 1 Column 1
void main(void)
WDTCTL = WDTPW + WDTHOLD; // stop watchdog
lcd_init();
lcd_setCursor(05);
lcd_print("hello");
// lcd_setCursor(15);
//lcd_print("lcd");
lcd_setCursor(00);
while(1);