本帖最后由 qinkaiabc 于 2014-1-17 13:11 编辑
【Energia开发环境】MSP430 LAUNCHPAD学习笔记7--4位驱动1602液晶显示 材料： · MSP-EXP430G2 553LaunchPad · LCD1602字符液晶 1602LCD主要技术参数：
显示容量为16×2个字符；
芯片工作电压为4.5～5.5V；
工作电流为2.0mA（5.0V）；
模块最佳工作电压为5.0V；
字符尺寸为2.95×4.35（W×H）mm。 MSP430 LAUNCHPAD提供3.57V的电压也是能够正常驱动1602的。 1602液晶接口引脚定义 ： 除了1脚（VSS）2脚（VDD）需要接外，15脚和16脚也需要接正负极，3号脚最好接GND，不接的话，会看不到显示的字。 4位接法的硬件连接图： 源程序: /******************************************************************* 1602液晶显示 【Energia开发环境】MSP430 LAUNCHPAD学习笔记7--1602液晶显示 Autor: qinkaiabc * 液晶1602.c--4线驱动 * Created on: 2013-7-27 * Author: Qinkai * P2_0 -> D4 * P2_1 -> D5 * P2_2 -> D6 * P2_3 -> D7 * P2_5 -> EN * P2_4 -> RS * VO(VL) ->GND * RW -> GND ********************************************************************/ int D4 = P2_0; int D5 = P2_1; int D6 = P2_2; int D7 = P2_3; int RS = P2_4; int EN = P2_5; //引脚定义，从头文件可知 int a[6] = { 8, 9, 10, 11,12,13}; void LCD_Command_Write(int command) { int i,temp; digitalWrite( RS,LOW); digitalWrite( EN,LOW); delayMicroseconds(1); digitalWrite( EN,HIGH); temp = command & 0xf0; for(i=a[3];i>7;i--) //写高四位 { digitalWrite(i,temp & 0x80); temp <<= 1; } digitalWrite( EN,HIGH); delayMicroseconds(1); digitalWrite( EN,LOW); temp=(command & 0x0f) << 4; for(i=a[3];i>7;i--) //写低四位 { digitalWrite(i,temp & 0x80); temp <<= 1; } digitalWrite( EN,HIGH); delayMicroseconds(1); digitalWrite( EN,LOW); } void LCD_Data_Write(int dat) { int i,temp; digitalWrite( RS,HIGH); digitalWrite( EN,LOW); delayMicroseconds(1); digitalWrite( EN,HIGH); temp = dat & 0xf0; for(i=a[3];i>7;i--) //写高四位 { digitalWrite(i,temp & 0x80); temp <<= 1; } digitalWrite( EN,HIGH); delayMicroseconds(1); digitalWrite( EN,LOW);
temp=(dat & 0x0f) << 4; for(i=a[3];i>7;i--) //写低四位 { digitalWrite(i,temp & 0x80); temp <<= 1; } digitalWrite( EN,HIGH); delayMicroseconds(1); digitalWrite( EN,LOW); } //显示字符 void LCD_write_int(unsigned int x,unsigned int y,unsigned int data) { unsigned int address; //写地址 if (y == 0) { address = 0x80 + x; } else { address = 0xc0 + x; } LCD_Command_Write( address); delayMicroseconds(1); LCD_Data_Write(data); } //LCD在任意位置写字符串 //列x=0~15,行y=0,1 void LCD_write_string(unsigned int x,unsigned int y,char *s) { unsigned int address; //写地址 if (y == 0) { address = 0x80 + x; } else { address = 0xc0 + x; } LCD_Command_Write( address); delayMicroseconds(1); while (*s) // 显示字符 { LCD_Data_Write( *s ); delayMicroseconds(1); s++; } } //lcd初始化程序 void LCD1602_Init() { int i=0; for(i=8;i<14;i++)//初始化P2引脚为输出 { pinMode(i,OUTPUT); } delay(100); LCD_Command_Write(0x28); delay(50); LCD_Command_Write(0x06); delay(50); LCD_Command_Write(0x0c); delay(50); LCD_Command_Write(0x80); delay(50); LCD_Command_Write(0x01); delay(50); } void setup() { LCD1602_Init();
} void loop() { LCD_Command_Write(0x01); delay(50); LCD_write_string(0,0,"Hello! EEWORLD!"); LCD_write_string(0,1,"MSP430 LAUNCHPAD"); delay(5000); LCD_write_string(0,0,"EnergiaforMSP430");
delay(5000); } 从头文件中看出MSP430 Launch Pad 的管脚定义如下： /************************************************************************* * pins_energia.h * Energia core files for MSP430 * Copyright (c) 2012 Robert Wessels. All right reserved. * Contribution: Rei VILO // +-\/-+ // VCC 1| |20 GND // (A0) P1.0 2| |19 XIN // (A1) P1.1 3| |18 XOUT // (A2) P1.2 4| |17 TEST // (A3) P1.3 5| |16 RST# // (A4) P1.4 6| |15 P1.7 (A7) (SCL) (MISO) depends on chip // (A5) P1.5 7| |14 P1.6 (A6) (SDA) (MOSI) // P2.0 8| |13 P2.5 // P2.1 9| |12 P2.4 // P2.2 10| |11 P2.3 // +----+ // Pin names based on the silkscreen static const uint8_t P1_0 = 2; static const uint8_t P1_1 = 3; static const uint8_t P1_2 = 4; static const uint8_t P1_3 = 5; static const uint8_t P1_4 = 6; static const uint8_t P1_5 = 7; static const uint8_t P2_0 = 8; static const uint8_t P2_1 = 9; static const uint8_t P2_2 = 10; static const uint8_t P2_3 = 11; static const uint8_t P2_4 = 12; static const uint8_t P2_5 = 13; static const uint8_t P1_6 = 14; static const uint8_t P1_7 = 15; static const uint8_t P2_7 = 18; static const uint8_t P2_6 = 19; static const uint8_t RED_LED = 2; static const uint8_t GREEN_LED = 14; static const uint8_t PUSH2 = 5; static const uint8_t TEMPSENSOR = 10; // depends on chip ***********************************************************************/ 所以在上面的初始化引脚和写命令及写数据，可以直接通过对数字操作。 By qinkaiabc
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