LCD12864驱动（STM32）5V和3.3V

一、前期准备
单片机：STM32F103ZET6
开发环境：MDK5.14
库函数：标准库V3.5
LCD12864模块：淘宝有售
这里写图片描述

二、实验效果
3.3V LCD12864
这里写图片描述

5V LCD12864
这里写图片描述

三、驱动原理
5V和3.3V模块均可以用STM32直接驱动，而不像1602那样5V必须是用5V驱动。注意的是模块上面的PSB脚接VCC，接VCC的话是采用并口传输数据，接GND采用串口传输，串口程序会在以后的博客中跟新。RST脚接VCC，此处没有用到硬件复位，所以直接接VCC，其复位低电平有效。驱动芯片资料，请自行搜索ST7920，里面自带字库。
需要完整工程或者有问题的请加QQ：1002521871，验证：呵呵。

四、驱动代码
LCD12864.h

#ifndef __LCD_12864_H__
#define __LCD_12864_H__
#include "stm32f10x.h"
#include "gpio.h"
#include "delay.h"

//IO Definitions
#define         RS          PCout(0)    
#define         RW          PCout(1)
#define         EN          PCout(2)
//#define           PSB         PCout(3)
//#define           RST         PCout(4)

#define         RS_Pin      GPIO_Pin_0
#define         RW_Pin      GPIO_Pin_1
#define         EN_Pin      GPIO_Pin_2
//#define           PSB_Pin     GPIO_Pin_3
//#define           RST_Pin     GPIO_Pin_4

typedef enum
{
    Command,
    Data
}WR_Mode;

#define         LINE1       0x80
#define         LINE2       0x90
#define         LINE3       0x88
#define         LINE4       0x98
extern void LCD12864_Show(uint8_t line, uint8_t pos, uint8_t *str);
extern void LCD12864Configuration(void);
extern void LCD_Clr(void);
#endif

LCD12864.c

#include "lcd12864.h"

void LCD_Wait_Ready(void)
{
    uint8_t status;
    RS = 0;
    RW = 1;

    GPIOD->ODR = 0xFF;
    do
    {
        EN = 1;
        DelayMs(5);
        status = GPIO_ReadInputDataBit(GPIOD, GPIO_Pin_7);
    }while(status & 0x80);

    EN = 0;
}

void LCD_Write_Cmd(uint8_t cmd)
{
    LCD_Wait_Ready();
    RS = 0;
    RW = 0;
    EN = 1;
    GPIOD->ODR = cmd;
    EN = 0;
}

void LCD_Write_Dat(uint8_t dat)
{
    LCD_Wait_Ready();
    RS = 1;
    RW = 0;
    EN = 1;
    GPIOD->ODR = dat;
    EN = 0;
}

void LCD_Init(void)
{
    LCD_Write_Cmd(0x30);
    LCD_Write_Cmd(0x0C);
    LCD_Write_Cmd(0x01);
}

void LCD_Write_Word(uint8_t *str)
{
    while (*str > 0)
    {
        LCD_Write_Dat(*str);
        str ++;
    }
}

void LCD_Write_Test(WR_Mode mode, uint8_t word)
{
    switch(mode)
    {
        case Command:
            LCD_Write_Cmd(word);
            break;
        case Data:
            LCD_Write_Dat(word);
            break;
    }
}

void LCD_Clr(void)
{
    LCD_Write_Test(Command, 0x01);
}

void LCM_CLR(void)
{
    uint8_t clear[16] = "                ";
    //                  "1234567812345678"
    LCD_Write_Test(Command, LINE1);
    LCD_Write_Word(clear);
    LCD_Write_Test(Command, LINE2);
    LCD_Write_Word(clear);
    LCD_Write_Test(Command, LINE3);
    LCD_Write_Word(clear);
}

void LCD12864_Show(uint8_t line, uint8_t pos, uint8_t *str)
{
    LCD_Write_Test(Command, line + pos);
    LCD_Write_Word(str);
}
void LCD12864Configuration(void)
{
    GPIO_InitTypeDef    GPIO;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC | RCC_APB2Periph_GPIOD, ENABLE);

    GPIO.GPIO_Pin   = RS_Pin | RW_Pin | EN_Pin;//| PSB_Pin | RST_Pin;
    GPIO.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO.GPIO_Mode  = GPIO_Mode_Out_PP;
    GPIO_Init(GPIOC, &GPIO);

    //Data Port , PD0 ~ PD7
    GPIO.GPIO_Pin   = 0xFF;
    GPIO_Init(GPIOD, &GPIO);

    LCD_Init();
    LCD_Clr();
}

由于作者能力有限，有不妥之处欢迎指正，邮箱[email protected]

LCD12864驱动（STM32）5V和3.3V

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