STM32F302 驱动 LCD1602

  1 #include "LCD1602.h"
  2 
  3 #define L_SHIFT     0X0
  4 #define R_SHIFT     0X1
  5 
  6 #define DISPLAY_ON  0X1
  7 #define DISPLAY_OFF 0X0
  8 
  9 #define DATA_WIDTH_8BITS    0X1
 10 #define DATA_WIDTH_4BITS    0X0
 11 
 12 #define ROW_NUM_2   0X1
 13 #define ROW_NUM_1   0X0
 14 
 15 #define DOT_MATRIC_5_7 0X0
 16 #define DOT_MATRIC_5_10 0X1
 17 
 18 #define     CMD_CLR             0X1
 19 #define     CMD_CARET_REWIND    0X2
 20 #define     CMD_CARET_SHIFT(X)  (0X4|(X<<1))   
 21 #define     CMD_DISP_ONOFF(X)   (0X8|(X<<2))
 22 #define     CMD_SC_LR(S,L)      (0X10|(S<<3)|(L<<2))
 23 #define     CMD_FUN_SET(DL,N,F) (0X20|(DL<<4)|(N<<3)|(F<<2))
 24 #define     CMD_CGRAM(ADDR)     (0X40|ADDR)   
 25 #define     CMD_DDRAM(ADDR)     (0X80|ADDR) 
 26 
 27 #define LCD1602_EN_HIGH()   GPIOB->BSRR = GPIO_Pin_6
 28 #define LCD1602_EN_LOW()    GPIOB->BRR = GPIO_Pin_6
 29 
 30 #define LCD1602_RS_HIGH() GPIOB->BSRR = GPIO_Pin_8
 31 #define LCD1602_RS_LOW() GPIOB->BRR = GPIO_Pin_8
 32 
 33 #define STCP_595_HIGH()   GPIOB->BSRR = GPIO_Pin_9
 34 #define STCP_595_LOW()   GPIOB->BRR = GPIO_Pin_9
 35 
 36 #define SHCP_595_HIGH()   GPIOB->BSRR = GPIO_Pin_5
 37 #define SHCP_595_LOW()   GPIOB->BRR = GPIO_Pin_5
 38 
 39 #define DS_595_HIGH()   GPIOB->BSRR = GPIO_Pin_4
 40 #define DS_595_LOW()   GPIOB->BRR = GPIO_Pin_4
 41 
 42 //#define LCD1602_RW PBout(8)
 43 //#define LCD1602_DATA 
 44 
 45 static void delayus(int us)
 46 {
 47     int i = 0;
 48     while(us--)
 49     {
 50         for(i=10;i;--i);
 51     }
 52 }
 53 static void writeByte(u8 ch)
 54 {
 55    int i = 0;
 56    STCP_595_LOW();
 57    SHCP_595_LOW();
 58    for(i=8;i;--i)
 59    {
 60     if(ch&0x80)
 61     {
 62         DS_595_HIGH();
 63     }
 64     else
 65     {
 66         DS_595_LOW();
 67     }
 68     SHCP_595_HIGH();
 69     ch <<= 1;
 70     SHCP_595_LOW();
 71    }
 72    STCP_595_HIGH();
 73 }
 74 
 75 void LCD1602_writeCmd(u8 cmd)
 76 {
 77     LCD1602_EN_HIGH();
 78     LCD1602_RS_LOW();
 79     writeByte(cmd);
 80     LCD1602_EN_LOW();
 81     delayus(1000);
 82 }
 83 
 84 void LCD1602_writeData(u8 data)
 85 {
 86     LCD1602_EN_HIGH();
 87     LCD1602_RS_HIGH();
 88     writeByte(data);
 89     LCD1602_EN_LOW();
 90     delayus(1000);
 91 }
 92 
 93 static void hw_init(void)
 94 {
 95   GPIO_InitTypeDef  GPIO_InitStructure;
 96   
 97   /* Enable the GPIO Clock */
 98   RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);
 99   
100   /* Configure the GPIO pin */
101   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6|GPIO_Pin_8|GPIO_Pin_9|GPIO_Pin_5|GPIO_Pin_4;
102   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
103   GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
104   GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
105   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
106   GPIO_Init(GPIOB, &GPIO_InitStructure); 
107 }
108 
109 void lcd1602_init(void)
110 {
111    hw_init();
112    
113    LCD1602_writeCmd(CMD_CARET_SHIFT(R_SHIFT));
114    LCD1602_writeCmd(CMD_DISP_ONOFF(DISPLAY_ON));
115    LCD1602_writeCmd(CMD_FUN_SET(DATA_WIDTH_8BITS,ROW_NUM_2,DOT_MATRIC_5_10));
116    LCD1602_writeCmd(CMD_CLR);
117    LCD1602_writeCmd(CMD_CARET_REWIND);
118 }
119 
120 /* u8 lcd1602_ReadStatus(void)
121 {
122     LCD1602_RS = 0;
123     LCD1602_RW = 1;
124     return (LCD1602_DATA&0X80)?1:0;
125 } */
126 
127 void lcd1602_display(u8*string)
128 {
129     int i = 0;
130     LCD1602_writeCmd(CMD_CLR);
131     LCD1602_writeCmd(CMD_CARET_REWIND);
132     while(*string)
133     {
134        LCD1602_writeData(*string++); 
135        ++i;
136        if(i == 16) LCD1602_writeCmd(CMD_DDRAM(0x40));
137     }
138 }
139 
140 void lcd1602_display_pos(int row,int column, u8*string)
141 {
142     int pos = (row-1)*0x40+column;
143     LCD1602_writeCmd(CMD_DDRAM(pos));
144     while(*string)
145     {
146        LCD1602_writeData(*string++); 
147     }
148 }