lcd1602.c

??lcd1602.c如下：

#include "lcd1602.h"
#include "delay.h"

void GPIO_Configuration ( void ) {
    GPIO_InitTypeDef GPIO_InitStructure;
    RCC_APB2PeriphClockCmd ( RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOC, ENABLE );
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3 |
                                  GPIO_Pin_4 | GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init ( GPIOA, &GPIO_InitStructure );
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7 | GPIO_Pin_8 | GPIO_Pin_9;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init ( GPIOC, &GPIO_InitStructure );
}

void LCD1602_Wait_Ready ( void ) {
    u8 sta;
    DATAOUT ( 0xff );
    LCD_RS_Clr();
    LCD_RW_Set();

    do {
        LCD_EN_Set();
        delay_ms ( 5 );
        sta = GPIO_ReadInputDataBit ( GPIOA, GPIO_Pin_7 );
        LCD_EN_Clr();
    } while ( sta & 0x80 ); /* bit7等于1表示液晶正忙，重复检测直到其等于0为止 */
}

void LCD1602_Write_Cmd ( u8 cmd ) {
    LCD1602_Wait_Ready();
    LCD_RS_Clr();
    LCD_RW_Clr();
    DATAOUT ( cmd );
    LCD_EN_Set();
    LCD_EN_Clr();
}

void LCD1602_Write_Dat ( u8 dat ) {
    LCD1602_Wait_Ready();
    LCD_RS_Set();
    LCD_RW_Clr();
    DATAOUT ( dat );
    LCD_EN_Set();
    LCD_EN_Clr();
}

void LCD1602_ClearScreen ( void ) {
    LCD1602_Write_Cmd ( 0x01 );
}

void LCD1602_Set_Cursor ( u8 x, u8 y ) { /* 设置光标位置 */
    u8 addr;

    if ( y == 0 ) {
        addr = 0x00 + x;
    } else {
        addr = 0x40 + x;
    }

    LCD1602_Write_Cmd ( addr | 0x80 );
}

void LCD1602_Show_Str ( u8 x, u8 y, u8 *str ) { /* 在液晶上显示字符串 */
    LCD1602_Set_Cursor ( x, y );

    while ( *str != '\0' ) {
        LCD1602_Write_Dat ( *str++ );
    }
}

void LCD1602_Init ( void ) {
    GPIO_Configuration();
    LCD1602_Write_Cmd ( 0x38 ); /* “16*2”显示，“5*7”点阵，8位数据口 */
    LCD1602_Write_Cmd ( 0x0c ); /* 开显示，光标关闭 */
    LCD1602_Write_Cmd ( 0x06 ); /* 文字不动，地址自动加一 */
    LCD1602_Write_Cmd ( 0x01 ); /* 清屏 */
}

lcd1602.h

??lcd1602.h如下：

#ifndef __LCD1602_H
#define __LCD1602_H

#include "sys.h"

/* 1602液晶指令/数据选择引脚 */
#define LCD_RS_Set() GPIO_SetBits(GPIOC, GPIO_Pin_9)
#define LCD_RS_Clr() GPIO_ResetBits(GPIOC, GPIO_Pin_9)
/* 1602液晶读写引脚 */
#define LCD_RW_Set() GPIO_SetBits(GPIOC, GPIO_Pin_8)
#define LCD_RW_Clr() GPIO_ResetBits(GPIOC, GPIO_Pin_8)
/* 1602液晶使能引脚 */
#define LCD_EN_Set() GPIO_SetBits(GPIOC, GPIO_Pin_7)
#define LCD_EN_Clr() GPIO_ResetBits(GPIOC, GPIO_Pin_7)
#define DATAOUT(x) GPIO_Write(GPIOA, x) /* 1602液晶数据端口 */

void GPIO_Configuration ( void );
void LCD1602_Wait_Ready ( void );
void LCD1602_Write_Cmd ( u8 cmd );
void LCD1602_Write_Dat ( u8 dat );
void LCD1602_ClearScreen ( void );
void LCD1602_Set_Cursor ( u8 x, u8 y );
void LCD1602_Show_Str ( u8 x, u8 y, u8 *str );
void LCD1602_Init ( void );
#endif

main.c

??main.c如下：

#include "led.h"
#include "lcd1602.h"
#include "delay.h"
#include "sys.h"
#include "usart.h"

int main ( void ) {
    SystemInit();
    delay_init ( 72 );
    NVIC_Configuration();
    uart_init ( 9600 );
    LED_Init();
    LCD1602_Init();
    LCD1602_Show_Str ( 2, 1, "I love STM32" );

    while ( 1 ) {
        LED0 = !LED0;
        delay_ms ( 200 );
    }
}