📄 mid_lcd.lst
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1: // MID_LCD.C
2: // Contain all the necessary LCD subroutines for EVM Board APP001 in Mid Range HIGHTEC C Format
3: // Must include "MID_LCD.H"
4:
5: #include "mid_lcd.h"
6: #include <pic.h>
7:
8: //
9: // Defines for I/O ports that provide LCD data & control
10: // PORTD[0:3]-->DB[4:7]: Higher order 4 lines data bus with bidirectional
11: // : DB7 can be used as a BUSY flag
12: // PORTA.2 --> [E] : LCD operation start signal control
13: // PORTD.5 --> [RW]: LCD Read/Write control
14: // PORTD.4 --> [RS]: LCD Register Select control
15: // : "0" for Instrunction register (Write), Busy Flag (Read)
16: // : "1" for data register (Read/Write)
17: //
18: #define CPU_SPEED 16 // CPU speed is 16 Mhz !!
19: #define LCD_RS RD4 // The definition of control pins
20: #define LCD_RW RD5
21: #define LCD_E RA2
22: #define LCD_DATA PORTD // PORTD[0:3] as LCD DB[4:7]
23: #define DIR_LCD_DATA TRISD
24: #define MASK_DIR_LCD_DATA 0b00000000
25: #define DIR_LCD_RS TRISD4
26: #define DIR_LCD_RW TRISD5
27: #define DIR_LCD_E TRISA2
28:
29:
30: // LCD Module commands
31: #define DISP_2Line_8Bit 0b00111000
32: #define DISP_2Line_4Bit 0b00101000
33: #define DISP_ON 0x00C // Display on
34: #define DISP_ON_C 0x00E // Display on, Cursor on
35: #define DISP_ON_B 0x00F // Display on, Cursor on, Blink cursor
36: #define DISP_OFF 0x008 // Display off
37: #define CLR_DISP 0x001 // Clear the Display
38: #define ENTRY_INC 0x006 //
39: #define ENTRY_INC_S 0x007 //
40: #define ENTRY_DEC 0x004 //
41: #define ENTRY_DEC_S 0x005 //
42: #define DD_RAM_ADDR 0x080 // Least Significant 7-bit are for address
43: #define DD_RAM_UL 0x080 // Upper Left coner of the Display
44:
45:
46:
47: unsigned char Temp_CMD ;
48: unsigned char Str_Temp ;
49: unsigned char Out_Mask ;
50: unsigned char Temp_LCD_DATA ;
51:
52: void OpenLCD(void)
53:
54: {
55: DIR_LCD_DATA = MASK_DIR_LCD_DATA ;
56: DIR_LCD_RS = 0 ;
57: DIR_LCD_RW = 0 ;
58: DIR_LCD_E = 0 ;
59:
60: LCD_E=0;
61:
62: TRISA2 = 0 ; // RA2 as output
63:
64: LCD_DATA = 0x00; // LCD DB[4:7] & RS & R/W --> Low
65:
66: DIR_LCD_DATA = 0x00; // LCD DB[4:7} & RS & R/W are output function
67: LCD_E=0; // Set E pin as output
68:
69: LCD_DATA = 0b00000011 ;
70: LCD_CMD_W_Timing() ;
71: LCD_L_Delay() ;
72:
73: LCD_DATA = 0b00000011 ;
74: LCD_CMD_W_Timing() ;
75: LCD_L_Delay() ;
76:
77: LCD_DATA = 0b00000011 ;
78: LCD_CMD_W_Timing() ;
79: LCD_L_Delay() ;
80:
81: LCD_DATA = 0b00000010 ;
82: LCD_CMD_W_Timing() ;
83: LCD_L_Delay() ;
84:
85: WriteCmdLCD(DISP_2Line_4Bit) ;
86: LCD_S_Delay() ;
87:
88: WriteCmdLCD(DISP_ON) ;
89: LCD_S_Delay() ;
90:
91: WriteCmdLCD(ENTRY_INC) ;
92: LCD_S_Delay() ;
93:
94: WriteCmdLCD(CLR_DISP) ;
95: LCD_L_Delay() ;
96:
97:
98: }
99:
100: //*********************************************
101: // _ ______________________________
102: // RS _>--<______________________________
103: // _____
104: // RW \_____________________________
105: // __________________
106: // E ____________/ \___
107: // _____________ ______
108: // DB _____________>--------------<______
109: //***********************************************
110: // Write Command to LCD module
111: //
112: void WriteCmdLCD( unsigned char LCD_CMD)
113: {
114:
115: Temp_LCD_DATA = LCD_DATA ;
116:
117: Temp_CMD = (LCD_CMD & 0xF0)>>4 ; // Send high nibble to LCD bus
118: LCD_DATA= (LCD_DATA & 0xF0)|Temp_CMD ;
119: LCD_CMD_W_Timing () ;
120:
121: Temp_CMD = LCD_CMD & 0x0F ; // Send low nibble to LCD bus
122: LCD_DATA= (LCD_DATA & 0xF0)|Temp_CMD ;
123: LCD_CMD_W_Timing () ;
124:
125: LCD_DATA = Temp_LCD_DATA ;
126:
127: LCD_S_Delay() ; // Delay 100uS for execution
128: }
129:
130: //***********************************************
131: // Write Data to LCD module
132: //
133: void WriteDataLCD( unsigned char LCD_CMD)
134: {
135:
136: Temp_LCD_DATA = LCD_DATA ;
137:
138: Temp_CMD = (LCD_CMD & 0xF0)>>4 ; // Send high nibble to LCD bus
139: LCD_DATA= (LCD_DATA & 0xF0)|Temp_CMD ;
140: LCD_DAT_W_Timing () ;
141:
142: Temp_CMD = LCD_CMD & 0x0F ; // Send low nibble to LCD bus
143: LCD_DATA= (LCD_DATA & 0xF0)|Temp_CMD ;
144: LCD_DAT_W_Timing () ;
145:
146: LCD_DATA = Temp_LCD_DATA ;
147:
148: LCD_S_Delay() ; // Delay 100uS for execution
149: }
150:
151: void putcLCD(unsigned char LCD_Char)
152: {
153: WriteDataLCD(LCD_Char) ;
154:
155: }
156: void LCD_CMD_W_Timing( void )
157: {
158: LCD_RS = 0 ; // Set for Command Input
159: #asm
160: nop
161: nop
162: #endasm
163: LCD_RW = 0 ;
164: #asm
165: nop
166: nop
167: nop
168: nop
169: nop
170: nop
171: nop
172: nop
173: nop
174: nop
175: #endasm
176: LCD_E = 1 ;
177: #asm
178: nop
179: nop
180: nop
181: nop
182: nop
183: nop
184: nop
185: nop
186: nop
187: nop
188: #endasm
189: LCD_E = 0 ;
190: }
191:
192: void LCD_DAT_W_Timing( void )
193: {
194: LCD_RS = 1 ; // Set for Data Input
195:
196: #asm
197: nop
198: nop
199: #endasm
200:
201: LCD_RW = 0 ;
202:
203: #asm
204: nop
205: nop
206: nop
207: nop
208: nop
209: nop
210: nop
211: nop
212: nop
213: nop
214: #endasm
215: LCD_E = 1 ;
216: #asm
217: nop
218: nop
219: nop
220: nop
221: nop
222: nop
223: nop
224: nop
225: nop
226: nop
227: #endasm
228: LCD_E = 0 ;
229: }
230:
231: //***********************************************
232: // Set Cursor position on LCD module
233: // CurY = Line (0 or 1)
234: // CurX = Position ( 0 to 15)
235: //
236: void LCD_Set_Cursor(unsigned char CurX, unsigned char CurY)
237: {
238: WriteCmdLCD( 0x80 + CurY * 0x40 + CurX) ;
239: LCD_S_Delay( ) ;
240: LCD_S_Delay( ) ;
241: LCD_S_Delay( ) ;
242: LCD_S_Delay( ) ;
243: LCD_S_Delay( ) ;
244: }
245:
246: //***********************************************
247: // Put a ROM string to LCD Module
248: //
249: void putrsLCD( const char *Str )
250: {
251: while (1)
252: {
253: Str_Temp = *Str ;
254:
255: if (Str_Temp != 0x00 )
256: {
257: WriteDataLCD(Str_Temp) ;
258: Str ++ ;
259: }
260: else
261: break ;
262: }
263: }
264:
265: //***********************************************
266: // Put a RAM string to LCD Module
267: //
268: void putsLCD( char *Str)
269: {
270: while (1)
271: {
272: Str_Temp = *Str ;
273:
274: if (Str_Temp != 0x00 )
275: {
276: WriteDataLCD(Str_Temp) ;
277: Str ++ ;
278: }
279: else
280: break ;
281: }
282: }
283:
284:
285: void puthexLCD(unsigned char HEX_Val)
286: {
287: unsigned char Temp_HEX ;
288:
289: Temp_HEX = (HEX_Val >> 4) & 0x0f ;
290:
291: if ( Temp_HEX > 9 )Temp_HEX += 0x37 ;
292: else Temp_HEX += 0x30 ;
293:
294: WriteDataLCD(Temp_HEX) ;
295:
296: Temp_HEX = HEX_Val & 0x0f ;
297: if ( Temp_HEX > 9 )Temp_HEX += 0x37 ;
298: else Temp_HEX += 0x30 ;
299:
300: WriteDataLCD(Temp_HEX) ;
301: }
302:
303: // *********************************************************************************
304: // Delay for atleast 10 ms
305: // *********************************************************************************
306: void LCD_L_Delay(void)
307: {
308: unsigned int Loop_L ;
309:
310: for ( Loop_L = 0 ; Loop_L < 10000 ; Loop_L ++ ) ;
311:
312: }
313:
314: // *********************************************************************************
315: // Delay for 100 us
316: // *********************************************************************************
317: void LCD_S_Delay(void)
318: {
319: unsigned int Loop_S ;
320:
321: for ( Loop_S = 0 ; Loop_S < 100 ; Loop_S ++ ) ;
322: }
323:
324:
325: void Delay10KTCYx( int Loop_10K )
326: {
327: int Loop_1 , Loop_2 ;
328:
329: for ( Loop_1 = 0 ; Loop_1 < Loop_10K ; Loop_1++ )
330: {
331: for ( Loop_2 = 0 ; Loop_2 < 10000 ; Loop_2++ )
332: {
333: #asm
334: nop
335: #endasm
336: }
337: }
338:
339: }
340:
341: void Delay100TCYx( int D_Value )
342: {
343: int D_Loop , D_LoopA ;
344:
345: for ( D_Loop = 0 ; D_Loop < D_Value ; D_Loop++ )
346: {
347: for (D_LoopA = 0 ; D_LoopA < 10 ; D_LoopA ++ )
348: {
349: #asm
350: nop
351: #endasm
352: }
353: }
354: }
355:
356: void LCD_Put_HEX(unsigned char HEX_Val)
357: {
358: unsigned char Temp_HEX ;
359:
360: Temp_HEX = (HEX_Val >> 4) & 0x0f ;
361: if ( Temp_HEX > 9 )
362: Temp_HEX += 0x37 ;
363: else
364: Temp_HEX += 0x30 ;
365:
366: putcLCD(Temp_HEX) ;
367:
368: Temp_HEX = HEX_Val & 0x0f ;
369: if ( Temp_HEX > 9 )
370: Temp_HEX += 0x37 ;
371: else
372: Temp_HEX += 0x30 ;
373:
374: putcLCD(Temp_HEX) ;
375:
376: }
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