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156: else
157: {
158: /* configure data pins as output */
159: DDR(LCD_DATA0_PORT) |= _BV(LCD_DATA0_PIN);
160: DDR(LCD_DATA1_PORT) |= _BV(LCD_DATA1_PIN);
161: DDR(LCD_DATA2_PORT) |= _BV(LCD_DATA2_PIN);
162: DDR(LCD_DATA3_PORT) |= _BV(LCD_DATA3_PIN);
163:
164: /* output high nibble first */
165: LCD_DATA3_PORT &= ~_BV(LCD_DATA3_PIN);
166: LCD_DATA2_PORT &= ~_BV(LCD_DATA2_PIN);
167: LCD_DATA1_PORT &= ~_BV(LCD_DATA1_PIN);
168: LCD_DATA0_PORT &= ~_BV(LCD_DATA0_PIN);
169: if(data & 0x80) LCD_DATA3_PORT |= _BV(LCD_DATA3_PIN);
170: if(data & 0x40) LCD_DATA2_PORT |= _BV(LCD_DATA2_PIN);
171: if(data & 0x20) LCD_DATA1_PORT |= _BV(LCD_DATA1_PIN);
172: if(data & 0x10) LCD_DATA0_PORT |= _BV(LCD_DATA0_PIN);
173: lcd_e_toggle();
174:
175: /* output low nibble */
176: LCD_DATA3_PORT &= ~_BV(LCD_DATA3_PIN);
177: LCD_DATA2_PORT &= ~_BV(LCD_DATA2_PIN);
178: LCD_DATA1_PORT &= ~_BV(LCD_DATA1_PIN);
179: LCD_DATA0_PORT &= ~_BV(LCD_DATA0_PIN);
180: if(data & 0x08) LCD_DATA3_PORT |= _BV(LCD_DATA3_PIN);
181: if(data & 0x04) LCD_DATA2_PORT |= _BV(LCD_DATA2_PIN);
182: if(data & 0x02) LCD_DATA1_PORT |= _BV(LCD_DATA1_PIN);
183: if(data & 0x01) LCD_DATA0_PORT |= _BV(LCD_DATA0_PIN);
184: lcd_e_toggle();
185:
186: /* all data pins high (inactive) */
187: LCD_DATA0_PORT |= _BV(LCD_DATA0_PIN);
188: LCD_DATA1_PORT |= _BV(LCD_DATA1_PIN);
189: LCD_DATA2_PORT |= _BV(LCD_DATA2_PIN);
190: LCD_DATA3_PORT |= _BV(LCD_DATA3_PIN);
191: }
192: }
193: #else
194: #define lcd_write(d,rs) if (rs) *(volatile uint8_t*)(LCD_IO_DATA) = d;
else *(volatile uint8_t*)(LCD_IO_FUNCTION) = d;
195: /* rs==0 -> write instruction to LCD_IO_FUNCTION */
196: /* rs==1 -> write data to LCD_IO_DATA */
D:\juergen\Projekt\Projekt\prog\Frequenzzaehler\lcd.c
197: #endif
198:
199:
200:
/************************************************************************
*
201: Low-level function to read byte from LCD controller
202: Input: rs 1: read data
203: 0: read busy flag / address counter
204: Returns: byte read from LCD controller
205:
*************************************************************************
/
206: #if LCD_IO_MODE
207: static uint8_t lcd_read(uint8_t rs)
208: {
209: uint8_t data;
210:
211:
212: if (rs)
213: lcd_rs_high(); /* RS=1: read data */
214: else
215: lcd_rs_low(); /* RS=0: read busy flag */
216: lcd_rw_high(); /* RW=1 read mode */
217:
218: if ( ( &LCD_DATA0_PORT == &LCD_DATA1_PORT) && ( &LCD_DATA1_PORT ==
&LCD_DATA2_PORT ) && ( &LCD_DATA2_PORT == &LCD_DATA3_PORT )
219: && ( LCD_DATA0_PIN == 0 )&& (LCD_DATA1_PIN == 1) && (LCD_DATA2_PIN
230