1 files changed, 150 insertions, 0 deletions
diff --git a/src/drivers/ao_lcd.c b/src/drivers/ao_lcd.c
new file mode 100644
index 00000000..6def0c80
--- /dev/null
+++ b/src/drivers/ao_lcd.c
@@ -0,0 +1,150 @@
+/*
+ * 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"
+
+static uint16_t	ao_lcd_time = 3;
+
+static __xdata uint8_t	ao_lcd_mutex;
+
+static void
+ao_lcd_delay(void)
+{
+	volatile uint16_t	count;
+
+	for (count = 0; count < ao_lcd_time; count++)
+		;
+}
+
+static void
+ao_lcd_send_ins(uint8_t ins)
+{
+//	printf("send ins %02x\n", ins);
+//	ao_lcd_wait_idle();
+//	ao_delay(1);
+	ao_lcd_delay();
+	ao_lcd_port_put_nibble(0, ins >> 4);
+	ao_lcd_port_put_nibble(0, ins & 0xf);
+}
+
+static void
+ao_lcd_put_byte(uint8_t c)
+{
+//	printf ("send data %02x\n", c);
+//	ao_lcd_wait_idle();
+	ao_lcd_delay();
+	ao_lcd_port_put_nibble(1, c >> 4);
+	ao_lcd_port_put_nibble(1, c & 0x0f);
+}
+
+void
+ao_lcd_putstring(char *string)
+{
+	char	c;
+
+	ao_mutex_get(&ao_lcd_mutex);
+	while ((c = (uint8_t) *string++))
+		ao_lcd_put_byte((uint8_t) c);
+	ao_mutex_put(&ao_lcd_mutex);
+}
+
+#define AO_LCD_POWER_CONTROL	0x54
+
+void
+ao_lcd_contrast_set(uint8_t contrast)
+{
+	ao_mutex_get(&ao_lcd_mutex);
+	ao_lcd_send_ins(AO_LCD_POWER_CONTROL | ((contrast >> 4) & 0x3));
+	ao_lcd_send_ins(0x70 | (contrast & 0xf));
+	ao_mutex_put(&ao_lcd_mutex);
+}
+
+void
+ao_lcd_cursor_on(void)
+{
+	ao_mutex_get(&ao_lcd_mutex);
+	ao_lcd_send_ins(0x08 | 0x04 | 0x02 | 0x01);
+	ao_mutex_put(&ao_lcd_mutex);
+}
+
+void
+ao_lcd_cursor_off(void)
+{
+	ao_mutex_get(&ao_lcd_mutex);
+	ao_lcd_send_ins(0x08 | 0x04);
+	ao_mutex_put(&ao_lcd_mutex);
+}
+
+void
+ao_lcd_clear(void)
+{
+	ao_mutex_get(&ao_lcd_mutex);
+	ao_lcd_send_ins(0x01);
+	ao_delay(1);
+	/* Entry mode */
+	ao_lcd_send_ins(0x04 | 0x02);
+	ao_mutex_put(&ao_lcd_mutex);
+}
+
+void
+ao_lcd_goto(uint8_t addr)
+{
+	ao_mutex_get(&ao_lcd_mutex);
+	ao_lcd_send_ins(0x80 | addr);
+	ao_lcd_send_ins(0x04 | 0x02);
+	ao_mutex_put(&ao_lcd_mutex);
+}
+
+void
+ao_lcd_start(void)
+{
+	/* get to 4bit mode */
+	ao_lcd_port_put_nibble(0, 0x3);
+	ao_lcd_port_put_nibble(0, 0x3);
+	ao_lcd_port_put_nibble(0, 0x3);
+	ao_lcd_port_put_nibble(0, 0x2);
+
+	/* function set */
+	ao_lcd_send_ins(0x28);
+	/* function set, instruction table 1 */
+	ao_lcd_send_ins(0x29);
+
+	/* freq set */
+	ao_lcd_send_ins(0x14);
+
+	/* Power/icon/contrast control*/
+	ao_lcd_send_ins(AO_LCD_POWER_CONTROL);
+
+	/* Follower control */
+	ao_lcd_send_ins(0x6d);
+	ao_delay(AO_MS_TO_TICKS(200));
+
+	/* contrast set */
+	ao_lcd_contrast_set(0x18);
+
+	/* Display on */
+	ao_lcd_send_ins(0x08 | 0x04);
+
+	/* Clear */
+	ao_lcd_clear();
+}
+
+void
+ao_lcd_init(void)
+{
+	ao_lcd_port_init();
+}