diff options
| author | Bdale Garbee <bdale@gag.com> | 2012-09-12 20:01:22 -0600 |
|---|---|---|
| committer | Bdale Garbee <bdale@gag.com> | 2012-09-12 20:01:22 -0600 |
| commit | 3b612efcd1dddc6a3d59012f7ed57754b1f798c2 (patch) | |
| tree | 18d50713491ef96c5c127a309f870efb6c33f98d /src/avr/ao_lcd_port.c | |
| parent | e076773c1693e2a62bb828dee71c04c20dbab0a5 (diff) | |
| parent | 01eb36408d7e0e826b431fcc1d3b2deb23607e0b (diff) | |
Merge branch 'new-debian' into debian
Conflicts:
ChangeLog
debian/altos.install
debian/changelog
debian/control
debian/copyright
debian/dirs
debian/docs
debian/menu
debian/rules
src/Makefile
Diffstat (limited to 'src/avr/ao_lcd_port.c')
| -rw-r--r-- | src/avr/ao_lcd_port.c | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/src/avr/ao_lcd_port.c b/src/avr/ao_lcd_port.c new file mode 100644 index 00000000..b1e8aa17 --- /dev/null +++ b/src/avr/ao_lcd_port.c @@ -0,0 +1,74 @@ +/* + * Copyright © 2011 Keith Packard <keithp@keithp.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. + */ + +#include "ao.h" + +#define LCD_PORT PORTB +#define LCD_DDR DDRB + +#define PIN_RS 4 +#define PIN_E 5 +#define PIN_RW 6 + +static void +ao_lcd_port_set_bits(uint8_t bits) +{ +#if 0 + printf("\tLCD data %x RS %d R/W %d E %d\n", + bits & 0xf, + (bits & (1 << PIN_RS)) ? 1 : 0, + (bits & (1 << PIN_RW)) ? 1 : 0, + (bits & (1 << PIN_E)) ? 1 : 0); +#endif + LCD_PORT = bits; +#if 0 + ao_delay(1); + if (bits & (1 << PIN_RW)) + printf("\tLCD input %x\n", PINB); +#endif +} + +uint8_t +ao_lcd_port_get_nibble(uint8_t rs) +{ + uint8_t data = (rs ? (1 << PIN_RS) : 0) | (1 << PIN_RW); + uint8_t n; + + DDRB = (1 << PIN_RS) | (1 << PIN_E) | (1 << PIN_RW); + ao_lcd_port_set_bits(data); + ao_lcd_port_set_bits(data | (1 << PIN_E)); + n = PINB & 0xf; + ao_lcd_port_set_bits(data); + return n; +} + +void +ao_lcd_port_put_nibble(uint8_t rs, uint8_t data) +{ + data = (data & 0xf) | (rs ? (1 << PIN_RS) : 0); + DDRB = (0xf) | (1 << PIN_RS) | (1 << PIN_E) | (1 << PIN_RW); + ao_lcd_port_set_bits(data); + ao_lcd_port_set_bits(data | (1 << PIN_E)); + ao_lcd_port_set_bits(data); +} + +void +ao_lcd_port_init(void) +{ + DDRB = (1 << PIN_RS) | (1 << PIN_E) | (1 << PIN_RW); + PORTB = 0; +} |