MSP430G2553 P2 high 4 bit connect LCD1602

Mike Jin

Prodigy 220 points

Other Parts Discussed in Thread: MSP430G2553

MSP430G2553 20pins 4位 LCD1602显示

作为初学者，在过去的一周反复查资料，有所小成如下。

G2553可怜的GPIO口数，计划使用P2高四位，但是实用中发现P2.6和P2.7多功能引脚。(Pin19 is P2.6, P18 is P2.7.)

计划使用P1.6 and P1.7 as I2C communication port.

改来改去最终发现P2.6和P2.7无法使用，其默认功能选择晶振XIN和XOUT，

若要使用它们的IO功能，需将P2SEL.6和P2SEL.7置零。

在GPIO初始化里将它们配置为普通IO口之后，果然能正常显示数据了。

l P2SEL&=~(BIT6+BIT7);// Using the second functions;

l P2SEL2&=~(BIT6+BIT7);//Using the second functions;

Clock Configuration；

TI MCU MSP430 单片机工作的系统时钟被分为了MCLK、SMCLK 和ACLK 三个，可以根据需要关闭其中的一个几个或全部。

l #include <INTRINSICS.h>

__delay_cycles(1000000); //与CPU时钟相关的长延时

l Do you know why 32768 Hz is a standard?

It is because that number is 2¹⁵

全屏 LCD.c.txt 下载

/*
 * LCD.c
 *
 *  Created on: 2020��3��25��
 *      Author: Mikejin
 */

#include"lcd.h"
#include "msp430g2553.h"
#include <intrinsics.h>

//����////////////////////////////////////////////////////////////////////
#define LCD_EN_PORT P1OUT//����2��Ҫ��Ϊͬһ����
#define LCD_EN_DDR P1DIR
#define LCD_RS_PORT P1OUT//����2��Ҫ��Ϊͬһ����
#define LCD_RS_DDR P1DIR
#define LCD_DATA_PORT P2OUT //����3��Ҫ��Ϊͬһ����
#define LCD_DATA_DDR P2DIR //һ��Ҫ�ø�4λ

#define LCD_RS BIT2
#define LCD_EN BIT1

//#define LCD_DATA    BIT0|BIT1|BIT2|BIT3|BIT4|BIT5|BIT6|BIT7  //8λ����������ģʽʱʹ��
#define LCD_DATA    BIT4|BIT5|BIT6|BIT7   //4λ����������ģʽʱʹ��
////Ԥ���庯��//////////////////////////////////////////////////////////////////


//LCDҺ����������///////////////////////////////////////////////////////////////
//LCD1602Һ����ʼ��
void LCD_init(void)
{

    P2SEL&=~(BIT6+BIT7);// Using the second functions;
    P2SEL2&=~(BIT6+BIT7);//Using the second functions;

    delay_nms(15);
    LCD_DATA_DDR|=LCD_DATA; //���ݿڷ���Ϊ���
    LCD_EN_DDR|=LCD_EN; //����EN����Ϊ���
    LCD_RS_DDR|=LCD_RS; //����RS����Ϊ���

    delay_1ms();              //��4�в�Ҫ�ģ��������û��ʾ
//  LCD_write_command(0x38);  //8λ���ݽӿ�ʱ��ʹ�����У��������û��ʾ
    LCD_write_command(0x33);  //4λ���ݽӿ�ʱ��ʹ�����У��������û��ʾ
    delay_1ms();             //
//  LCD_write_command(0x38);  //8λ���ݽӿ�ʱ��ʹ�����У��������û��ʾ
    LCD_write_command(0x32);  //4λ���ݽӿ�ʱ��ʹ�����У��������û��ʾ
    delay_1ms();
//  LCD_write_command(0x38); //8λ���ݽӿ�ʱ��ʹ�����У��������û��ʾ


    delay_1ms();
//  LCD_write_command(0x38); //8λ���ݽӿ�
    LCD_write_command(0x2c); //4λ���ݽӿ�

    delay_1ms();
    LCD_write_command(0x0c); //��ʾ��

    delay_1ms();
    LCD_write_command(0x01); //����

    delay_1ms();
    LCD_write_command(0x06);

}
//Һ��ʹ��
void LCD_en_write(void)
{
LCD_EN_PORT|=LCD_EN;
delay_nus(10);
LCD_EN_PORT&=~LCD_EN;
}
//дָ��
void LCD_write_command(unsigned char command)
{


delay_nus(16);
LCD_RS_PORT&=~LCD_RS; //RS=0
LCD_DATA_PORT&=0X0f; //�����λ
LCD_DATA_PORT|=command&0xf0; //д����λ
//LCD_DATA_PORT = command; //д8λ

delay_nus(16);
LCD_en_write();
command=command<<4; //����λ�Ƶ�����λ
LCD_DATA_PORT&=0x0f; //�����λ
LCD_DATA_PORT|=command&0xf0; //д����λ

LCD_en_write();
}
//д����
void LCD_write_data(unsigned char data)
{

delay_nus(16);
LCD_RS_PORT|=LCD_RS; //RS=1
LCD_DATA_PORT&=0X0f; //�����λ
LCD_DATA_PORT|=data&0xf0; //д����λ
//LCD_DATA_PORT = data; //д8λ

LCD_en_write();
data=data<<4; //����λ�Ƶ�����λ
LCD_DATA_PORT&=0X0f; //�����λ
LCD_DATA_PORT|=data&0xf0; //д����λ
LCD_en_write();
}
//д��ַ����
void LCD_set_xy( unsigned char x, unsigned char y )
{
unsigned char address;
if (y == 0) address = 0x80 + x;
else address = 0xc0 + x;
LCD_write_command( address);
}
//LCD������λ��д�ַ���
//��x=0~15,��y=0,1
void LCD_write_string(unsigned char X,unsigned char Y,unsigned char *s)
{
    LCD_set_xy( X, Y ); //д��ַ
while (*s) // д��ʾ�ַ�
{
LCD_write_data( *s );
s ++;
}
}
//LCD������λ��д�ַ�
//��x=0~15,��y=0,1
void LCD_write_char(unsigned char X,unsigned char Y,unsigned char data)
{
LCD_set_xy( X, Y ); //д��ַ
LCD_write_data( data);
}
//��ʱ����//////////////////////////////////////////////////////////////////////
//1us��ʱ����
void delay_1us(void)
{
asm(" nop");
}
//N us��ʱ����
void delay_nus(unsigned int n)
{
unsigned int i;
for (i=0;i<n;i++);
delay_1us();
}
//1ms��ʱ����
void delay_1ms(void)
{
unsigned int i;
for (i=0;i<1140;i++);
}
//N ms��ʱ����
void delay_nms(unsigned int n)
{
unsigned int i=0;
for (i=0;i<n;i++);
delay_1ms();
}

全屏 LCD.h.txt 下载

/*
 * LCD.h
 *
 *  Created on: 2020��3��25��
 *      Author: Mikejin
 */

#ifndef LCD_H_
#define LCD_H_

void LCD_init(void);
void LCD_en_write(void);
void LCD_write_command(unsigned char command);
void LCD_write_data(unsigned char data);
void LCD_set_xy (unsigned char x, unsigned char y);
void LCD_write_string(unsigned char X,unsigned char Y,unsigned char *s);
void LCD_write_char(unsigned char X,unsigned char Y,unsigned char data);
void delay_1ms(void);
void delay_nus(unsigned int n);
void delay_nms(unsigned int n);





#endif /* LCD_H_ */

全屏 main.c.txt 下载

/**************************************************
* LCD1602 Display
* Description: P2 High 4 Bits for LCD1602 and P1.6 and P1.7 for I2C integrated another programmer. 
* LCD1602 The first line showing "Hello!LCD1602D"
* LCD1602 The Second line showing "123456789abcdefg"
*
* Date��2020��4��12�յ��Գɹ�������������Ҫ����ΪLCD��ʼ����
*
* Ӳ����·��MSP430G2553 20pins
* Ӳ�����ӣ�
*
* MSP430��LCD������Ϣ
* LCD1602��4λ�ӿڣ���ʹ��D4-D7���ݿڣ�D0-D3������MCU
* PIN1 --> ��
* PIN2 --> VCC��һ��Ҫ��+5V��
* PIN3 -->����ʱ���գ�ʵ�ʵ�· 2K����-->�� (һ��Ҫ�Ӻã�����û���κ���ʾ)
* PIN4 --> RS --> P1.2
* PIN5 --> R/W --> GND
* PIN6 --> EN --> P1.1
* PIN7 --> D0����               * PIN8 --> D1����       * PIN9 --> D2����     * PIN10 --> D3����
* PIN11 --> D4 --> P2.4
* PIN12 --> D5 --> P2.5
* PIN13 --> D6 --> P2.6
* PIN14 --> D7 --> P2.7
* PIN15 --> VCC��һ��Ҫ��+5V�������Ҫ������Բ���)
* PIN16 --> ��
* ��������MSP430FETȫϵ��JTAG������
* ��������� CCS9.3 ����
**************************************************/
#include "msp430g2553.h"
#include <intrinsics.h>
#include"lcd.h"

void main()
{
    WDTCTL = WDTPW + WDTHOLD; // Stop watchdog

    LCD_init();
    delay_1ms();
    while(1)
    {
        LCD_write_string(1,0,"Hello!LCD1602D");
        delay_1ms();
        LCD_write_string(0,1,"123456789abcdefg");
    }

}

Summary.docx

5 年多前

Susan Yang 5 年多前

TI__Guru**** 252096 points

谢谢您的详细分享以及对TI产品的支持！

MSP 低功耗微控制器

MSP 低功耗微控制器论坛

MSP430G2553 P2 high 4 bit connect LCD1602