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Lcd.c：
/* Includes ------------------------------------------------------------------*/
#include "stm32f10x_lib.h"
#include "lcd.h"
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
u16 frame[4]; /* LCD frame buffer */
u16 digit[4]; /* Digit frame buffer */
char text[2];
/*the varitronix LCD digit is:
A
-- ----------
X \/ |\ |I /|
F| H | J |B
| \ | / |
--G-- --K--
| /| \ |
E | L | N |C
| / |M \| _
----------- | |DP
D -
PE0 PE1 PE2 PE3 ...................................................... PE15
----------------------------------------------------------------------------------------
| | S0 | S1 | S2 | S3 | S4 | S5 | S6 | S7 | S8 | S9 | S10| S11| S12| S13| S14| S15|
----------------------------------------------------------------------------------------
| COM1 | 1X | 1I | 1A | 1DP| 2X | 2I | 2A | 2DP| 3X | 3I | 3A | 3DP| 4X | 4I | 4A | 4DP|
----------------------------------------------------------------------------------------
| COM2 | 1F | 1H | 1J | 1B | 2F | 2H | 2J | 2B | 3F | 3H | 3J | 3B | 4F | 4H | 4J | 4B |
----------------------------------------------------------------------------------------
| COM3 | 1E | 1G | 1K | 1C | 2E | 2G | 2K | 2C | 3E | 3G | 3K | 3C | 4E | 4G | 4K | 4C |
----------------------------------------------------------------------------------------
| COM4 | 1L | 1M | 1N | 1D | 2L | 2M | 2N | 2D | 3L | 3M | 3N | 3D | 4L | 4M | 4N | 4D |
----------------------------------------------------------------------------------------
A LCD character coding is based on the following matrix:
{ X , F , E , L }
{ I , H , G , M }
{ A , J , K , N }
{ DP, B , C , D }
The characher A for example is:
{ 0 , 1 , 1 , 0 }
{ 0 , 0 , 1 , 0 }
{ 1 , 0 , 1 , 0 }
{ 0 , 1 , 1 , 0 }
-------------------
= 4 9 F 0 hex
=> 'A' = 0x4E70 */
const u16 letter[26]={0x49F0,0x01F8,0x4118,0x08F8,0x4178,0x4170,0x41D8,0x09F0,0x600A,
0x0888,0x0534,0x0118,0x0F90,0x0B94,0x4998,0x4970,0x499C,0x4974,
0x41E8,0x6002,0x0998,0x0511,0x299A,0x0605,0x0601,0x4409};
const u16 number[10]={0x4998,0x0880,0x4878,0x48E8,0x09E0,0x41E8,0x41F8,0x4880,0x49F8,0x49E8};
const u16 arrow[2]={0x0005,0x0600}; // {Upstair,Downstair}
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
/*******************************************************************************
* Function Name : convert
* Description : converts an ascii char to the a LCD digit (previous coding)
* Input1 : char
* Input2 : point : flag indicating if a point has to be add in front of
* displayed character (0: no, 1: yes)
* Output : None
* Return : None
*******************************************************************************/
void convert (char* c,u8 point)
{
u16 car=0,tmp;
u8 i;
const u16 mask[4]={0xF000,0x0F00,0x00F0,0x000F};
const u8 shift[3]={0xC,0x8,0x4};
if ((*c<0x5B)&(*c>0x40)) // 'A' --- 'F'
car = letter[*c-0x41];
else if ((*c<0x3A)&(*c>0x2F)) // '0' --- '9'
car = number[*c-0x30];
else if (*c==0x20) car =0; // 'space'
else if (*c=='+') car = arrow[0]; // upstair
else if (*c=='-') car = arrow[1]; // downstair
if (point==1) car|=0x8000;
for (i=0;i<3;i++)
{
tmp = car&mask[i];
digit[i] = tmp>>shift[i];
}
digit[3] = (car&mask[3]);
}
/*******************************************************************************
* Function Name : write char
* Description : This function writes a char in the LCD frame buffer
* Input1 : char ascii value
* Input2 : point 0: no point to add, 1 a point to add in front of char
* Input2 : pos: position of the caracter to write [0:3]
* Output : None
* Return : None
*******************************************************************************/
void write_char(char* car,u8 point,u8 pos)
{
int i;
const u16 mask[4]={0x0F,0xF0,0xF00,0xF000};
convert(car,point);
if (pos == 1) for (i=0;i<4;i++) digit[i]=(digit[i]<<4);
if (pos == 2) for (i=0;i<4;i++) digit[i]=(digit[i]<<8);
if (pos == 3) for (i=0;i<4;i++) digit[i]=(digit[i]<<12);
for (i=0;i<4;i++) frame[i]= (frame[i]&~mask[pos])|digit[i];
}
/*******************************************************************************
* Function Name : write_string
* Description : This function writes a string in the LCD
* Input : string
* Output : None
* Return : None
*******************************************************************************/
void write_string(char* str)
{
int i;
for (i=0;i<4;i++) write_char(str+i,0,i);
}
/*******************************************************************************
* Function Name : int2char
* Description : This function convertes a 2 digit int to a char
* Input : u8 value
* Output : None
* Return : None
*******************************************************************************/
char* int2char(u8 value)
{
text[0] = 0x30 + (value/10);
text[1] = 0x30 + (value%10);
return(text);
}
/******************* (C) COPYRIGHT 2007 STMicroelectronics *****END OF FILE****/
Lcd.h：
/******************** (C) COPYRIGHT 2007 STMicroelectronics ********************
* File Name : lcd.h
* Author : David JIANG
* Date First Issued : 2007.9.17
* Description : LCD functions
*
********************************************************************************
* History:
* 2007.9.17 : Version 1.0
********************************************************************************
* THE PRESENT SOFTWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME.
* AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT,
* INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE
* CONTENT OF SUCH SOFTWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING
* INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
*******************************************************************************/
/* Define to prevent recursive inclusion -------------------------------------*/
#ifndef __LCD_H
#define __LCD_H
/* Includes ------------------------------------------------------------------*/
/* Exported types ------------------------------------------------------------*/
/* Exported variables --------------------------------------------------------*/
extern u16 frame[4];
/* Exported constants --------------------------------------------------------*/
/* Exported macro ------------------------------------------------------------*/
/* Exported functions ------------------------------------------------------- */
char* int2char(u8 value);
void convert (char* c,u8 point);
void write_char(char* car, u8 point,u8 pos);
void write_string (char* string);
#endif
/******************* (C) COPYRIGHT 2007 STMicroelectronics *****END OF FILE****/
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