平臺：stm32f302, 屏幕： LCD1602

1 #ifndef __LCD1602_H__

2 #define __LCD1602_H__

3 #include "stm32f30x.h"

4 void lcd1602_init(void);

5 void lcd1602_display(u8*string);

6 void lcd1602_display_pos(int row,int column, u8*string);

7 #endif

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 }