altos/stm-vga: Implement VGA out from the STM processor

Generates vsync/hsync using timers and pixel data using the SPI port.
320x240 video using 640x480 mode and a 24MHz "pixel" clock.
Includes the beginings of rendering code for the frame buffer,
including bitblt, solid fill and text with a 5x7 font.

Signed-off-by: Keith Packard <keithp@keithp.com>

1 files changed, 59 insertions, 0 deletions

diff --git a/src/stm-vga/ao_demo.c b/src/stm-vga/ao_demo.c
new file mode 100644
index 00000000..582e4156
--- /dev/null
+++ b/src/stm-vga/ao_demo.c
@@ -0,0 +1,59 @@
+/*
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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"
+#include <ao_exti.h>
+#include <ao_event.h>
+#include <ao_quadrature.h>
+#include <ao_button.h>
+#include <ao_boot.h>
+#include <ao_vga.h>
+
+static void
+ao_video_toggle(void)
+{
+	ao_cmd_decimal();
+	ao_vga_enable(ao_cmd_lex_i);
+}
+
+__code struct ao_cmds ao_demo_cmds[] = {
+	{ ao_video_toggle, "V\0Toggle video" },
+	{ 0, NULL }
+};
+
+int
+main(void)
+{
+	ao_clock_init();
+
+	ao_task_init();
+
+	ao_led_init(LEDS_AVAILABLE);
+	ao_led_on(AO_LED_GREEN);
+	ao_led_off(AO_LED_BLUE);
+	ao_timer_init();
+	ao_dma_init();
+	ao_cmd_init();
+	ao_vga_init();
+	ao_usb_init();
+
+	ao_cmd_register(&ao_demo_cmds[0]);
+
+	ao_start_scheduler();
+	return 0;
+}