A.Rashad
Member level 4
Code C - [expand] 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 /*Program for LCD interfacing to ARM Microcontroller */ /*Robota Corporation*/ /*************************************************************************************************/ //Port 1.16-1.23 should be connected do Data pins of LCD(1.16=LSB) //Port 0.16 should be connected to Rs pin of LCD. //Port 0.17 should be connected to En pin of LCD. #include<lpc21xx.h> #include "lcd.h" /*---------- Initialization of LCD ----------*/ void lcdinit(void) { unsigned int j; unsigned char commands[]={0x30,0x30,0x30,0x20,0x28,0x08,0x01,0x06,0x0c},i=0; IODIR1=0x00ff0000; //data pins IODIR0=0x00030000; //rs=p0.16,en=p0.17 IOCLR1=0x00ff0000; while(i<9) { delay_lcd(); lcdsendcommand(commands[i]); i++; } } /*---------- Delay for LCD function ----------*/ void delay_lcd() { unsigned int i; for(i=0;i<1000;i++); } /*---------- Sending Command to LCD -----------*/ void lcdsendcommand(unsigned int cm) { cm=cm&&0xF0; //High Nibble cm=cm<<16; IOCLR0|=0x00010000; //RS =0 for Command. IOCLR1|=0x00ff0000; IOSET1|=cm; IOSET0|=0x00020000; delay_lcd(); IOCLR0|=0x00020000; delay_lcd(); // Low Nibble cm=cm&0x0F; cm=cm<<4; cm=cm<<16; //IOCLR0|=0x00010000; //RS =0 for Command. IOCLR1|=0x00ff0000; // check1 here IOSET1|=cm; IOSET0|=0x00020000; delay_lcd(); IOCLR0|=0x00020000; delay_lcd(); } /*---------- Sending character to LCD ----------*/ void lcdsendchar(unsigned int ch) { ch=ch&0xF0; ch=ch<<16; IOSET0|=0x00010000; //RS=1 for Data IOCLR1|=0x00ff0000; IOSET1|=ch; IOSET0|=0x00020000; delay_lcd(); IOCLR0|=0x00020000; delay_lcd(); ch=ch&0x0F; ch=ch<<4; ch=ch<<16; // IOSET0=0x00010000; //RS=1 for Data IOCLR1|=0x00ff0000; IOSET1|=ch; IOSET0=0x00020000; delay_lcd(); IOCLR0=0x00020000; delay_lcd(); } /*---------- Sending LCD String ----------*/ void lcdsendstring(unsigned char *name) { while(*name!='\0') { lcdsendchar(*name); name++; } } /*---------- Sending number to LCD ----------*/ extern void lcdsendnumber(unsigned int n) { //conversion of HEX to ASCII---simple// unsigned char a,b,c,d; d=n%10; n=n/10; c=n%10; //converting Hex in decimal n=n/10; b=n%10; n=n/10; a=n%10; d+=0x30; c+=0x30; //converting decimal in ASCII. b+=0x30; a+=0x30; lcdsendchar(a); delay_lcd(); lcdsendchar(b); delay_lcd(); lcdsendchar(c); delay_lcd(); lcdsendchar(d); lcdsendchar(0x41); } /*---------- Setting position of LCD ----------*/ void lcdposition(unsigned char LINE,unsigned char pos) { if(LINE==1) lcdsendcommand(0x80+pos); else if(LINE==2) lcdsendcommand(0xC0+pos); } /*---------- Clearing LCD Screen ----------*/ void lcdclear(void) { lcdsendcommand(0x01); }
I need to interface 16x2 lcd to ARM LPC2148 , PLEASE SEE THE ABOVE CODE FUNCTION
lcdinit(); where I am sending commands 0x30,0x30,0x30,0x20,0x28,0x08,0x01,0x06,0x0c
, also check delay_lcd() function,
my LCD showing garbage characters in 4 bit mode , I have done parsing of upper nibble in lcdsendcommand(); and lcdsendchar(); functions...
please suggest..
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