MSP430G2553使用4个IO口控制LCD的问题

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;

delay(1);

}

//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();

delay(1);

LCD_OUT = ((LCD_OUT & 0x0F) | ((value << 4) & 0xF0)); // Write low nibble next

pulseEN();

delay(1);

}

// 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);

delay(1);

}

// 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

delay(1);

lcd_write(0x0F CMD); // Display ON Cursor ON blink ON

delay(1);

lcd_write(0x01 CMD); // Clear screen

delay(20);

lcd_write(0x06 CMD); // Auto Increment Cursor

delay(1);

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);