STM32F0 #16进程帖（一）----- LCD12864液晶显示

sky-Hawk where

本帖最后由 Kite 于 2014-5-14 04:13 编辑

最近各种忙啊，上课、写报告、画板子、还要准备坑爹的期中考试{:soso_e153:}，最坑爹的是这分数还占期末成绩20%{:soso_e109:}。。。不过大家都在努力，我也不能闲着。今天就用Discovery调了一下12864液晶。。

代码是以前写的，直接移植过来了。话说STM32系列的固件库规则都差不多，F0系列和F1系列的程序移植几乎只用改个头文件了。废话少说，先上个图{:soso_e144:}，手机抓拍的，光线又不好，也只能拍成这样了{:soso_e143:}

12864是采用串行双线控制的方法，电路图如下，RS拉高，PSB拉低，R/W 和 E 在串行控制中分别作为数据线和时钟线

下面是代码。（附上完整工程供下载，由于M0的SysTick与M3的一样，故直接复制粘贴了以前的延时代码，在此对原作者“正点原子”表示感谢{:soso_e121:}）

STM32F0工程模板 LCD12864.rar (1.33 MB, 下载次数: 467)

main.c

#include "stm32f0xx.h"
#include "delay.h"
#include "device_init.h"
#include "LCD12864.h"
int main(void)
{
Device_Init();
LCD12864_Display_Words(0, 0, "Hello, world!");
LCD12864_Display_Words(1, 0, "www.eeboard.com");
while(1);
}//end main

复制代码

LCD12864.h

/**
******************************************************************************
* @file LCD12864.h
* @author Kite
* @version NULL
* @date 1-August-2012
* @brief The LCD12864 header file.
******************************************************************************
*/
#ifndef __LCD12864_H
#define __LCD12864_H
/* Includes ------------------------------------------------------------------*/
#include "stm32f0xx.h"
#if !defined u8 && !defined u16 && !defined u32
#define u8 uint8_t
#define u16 uint16_t
#define u32 uint32_t
#endif
/* Definitions ---------------------------------------------------------------*/
//接口输出操作(SID: PC0 SCLK: PC1)
#define LCD12864_SID_OUT(x) (x) ? (GPIOC->BSRR |= 1<<0) : (GPIOC->BRR |= 1<<0)
#define LCD12864_SCLK_OUT(x) (x) ? (GPIOC->BSRR |= 1<<1) : (GPIOC->BRR |= 1<<1)
/* Write command or dat select */
#define WRITE_CMD 0xF8
#define WRITE_DAT 0xFA
/* Exported functions declared ---------------------------------------------- */
void LCD12864_Init(void); //液晶初始化函数
void LCD12864_Clear(void); //液晶清屏
void LCD12864_Display_Words(u8 x, u8 y, u8 *str); //液晶字符显示函数
void LCD12864_Display_Picture(u8 *pic); //液晶图片显示函数
#endif

复制代码

LCD12864.c

/**
******************************************************************************
* @file LCD12864.c
* @author Kite
* @version NULL
* @date 1-August-2012
* @brief The LCD12864 C file.
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include "LCD12864.h"
#include "delay.h"
/* Private variables ---------------------------------------------------------*/
/* 字符显示RAM地址 */
u8 LCD12864_DDRAM_ADDR[4][8]={
{0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87}, //第一行
{0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97}, //第二行
{0x88, 0x89, 0x8A, 0x8B, 0x8C, 0x8D, 0x8E, 0x8F}, //第三行
{0x98, 0x99, 0x9A, 0x9B, 0x9C, 0x9D, 0x9E, 0x9F} //第四行
};
//delay functions
void delay_12864_ms(u16 xms)
{
delay_ms(xms);
}
void delay_12864_us(u16 xus)
{
delay_us(xus);
}
/* Private functions declared ------------------------------------------------*/
void LCD12864_SendByte(u8 Byte);
void LCD12864_Write(u8 writeSelect, u8 cmdOrDat);
/* Exported functions ------------------------------------------------------- */
/**
* @brief Initialize the LCD12864.
* @param None
* @retval None
*/
void LCD12864_Init(void)
{
delay_12864_ms(50); //等待液晶自检（延时>40ms）
LCD12864_Write(WRITE_CMD, 0x30); //功能设定
delay_12864_us(150); //延时>100us
LCD12864_Write(WRITE_CMD, 0x30); //功能设定
delay_12864_us(40); //延时>37us
LCD12864_Write(WRITE_CMD, 0x0C); //开显示
delay_12864_us(150); //延时>100us
LCD12864_Write(WRITE_CMD, 0x01); //清屏
delay_12864_ms(15); //延时>10ms
LCD12864_Write(WRITE_CMD, 0x06); //进入设定点，初始化完成
}
/**
* @brief Clear the screen.
* @param None
* @retval None
*/
void LCD12864_Clear(void)
{
LCD12864_Write(WRITE_CMD, 0x01); //清屏指令
delay_12864_ms(2); //延时以待液晶稳定【至少1.6ms】
}
/**
* @brief LCD12864 display words.
* @param x: row(0~3) y: line(0~7) str: the pointer to words
* @retval None
*/
void LCD12864_Display_Words(u8 x, u8 y, u8 *str)
{
LCD12864_Write(WRITE_CMD, LCD12864_DDRAM_ADDR[x][y]);
while(*str)
{
LCD12864_Write(WRITE_DAT, *str);
str++;
}
}
/**
* @brief LCD12864 display picture.
* @param pic: The pointer to the picture array.
* @retval None
*/
void LCD12864_Display_Picture(u8 *pic)
{
u8 x,y,i;
LCD12864_Write(WRITE_CMD, 0x34); //切换到扩充指令
LCD12864_Write(WRITE_CMD, 0x34); //关闭图形显示
for(i = 0; i < 9; i = i+8)
{
for(y=0;y<32;y++)
{
for(x=0;x<8;x++)
{
LCD12864_Write(WRITE_CMD, 0x80 + y); //行地址
LCD12864_Write(WRITE_CMD, 0x80 + x+i); //列地址
LCD12864_Write(WRITE_DAT, *pic ++); //写数据 D15－D8
LCD12864_Write(WRITE_DAT, *pic ++); //写数据 D7－D0
}
}
}
LCD12864_Write(WRITE_CMD, 0x36);//打开图形显示
LCD12864_Write(WRITE_CMD, 0x30); //切换回基本指令
}
/* Private functions -------------------------------------------------------- */
/**
* @brief Transmit single byte in TWO_WIRE_SERIAL_CONTROL.
* @param Byte: The byte to be written.
* @retval None
*/
void LCD12864_SendByte(u8 Byte)
{
u8 i;
for(i = 0; i < 8; i++)
{
LCD12864_SCLK_OUT(0); //时钟线置低
LCD12864_SID_OUT(Byte & (0x80>>i)); //将一字节数据送到数据总线
LCD12864_SCLK_OUT(1); //装载数据
LCD12864_SCLK_OUT(0);
}
}
/**
* @brief LCD12864 write command or data.
* @param writeSelect: Select to write command or data.
* This parameter can be one of the following values:
* @arg WRITE_CMD: Select to write command
* @arg WRITE_DAT: Select to write data
* @param cmdOrDat: The command or data to be written.
* @retval None
*/
void LCD12864_Write(u8 writeSelect, u8 cmdOrDat)
{
delay_12864_ms(1);
LCD12864_SendByte(writeSelect); //写指令【RW=0，RS=0】
LCD12864_SendByte(0xF0 & cmdOrDat); //写高4位
LCD12864_SendByte(0xF0 & cmdOrDat << 4); //写低4位
}