1 files changed, 78 insertions, 0 deletions
diff --git a/src/drivers/ao_pca9922.c b/src/drivers/ao_pca9922.c
new file mode 100644
index 00000000..dc006f55
--- /dev/null
+++ b/src/drivers/ao_pca9922.c
@@ -0,0 +1,78 @@
+/*
+ * Copyright © 2012 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.
+ */
+
+/*
+ * PCA9922 LED driver. This uses SPI to send a single byte to the device to
+ * set the current state of the LEDs using the existing LED interface
+ */
+
+#include <ao.h>
+
+static __xdata uint8_t	ao_led_state;
+
+static void
+ao_led_apply(void)
+{
+	/* Don't try the SPI bus during initialization */
+	if (!ao_cur_task)
+		return;
+	ao_spi_get_bit(AO_PCA9922_CS_PORT, AO_PCA9922_CS_PIN, AO_PCA9922_CS, AO_PCA9922_SPI_BUS, AO_SPI_SPEED_FAST);
+	ao_spi_send(&ao_led_state, 1, AO_PCA9922_SPI_BUS);
+	ao_spi_put_bit(AO_PCA9922_CS_PORT, AO_PCA9922_CS_PIN, AO_PCA9922_CS, AO_PCA9922_SPI_BUS);
+}
+
+void
+ao_led_on(uint8_t colors)
+{
+	ao_led_state |= colors;
+	ao_led_apply();
+}
+
+void
+ao_led_off(uint8_t colors)
+{
+	ao_led_state &= ~colors;
+	ao_led_apply();
+}
+
+void
+ao_led_set(uint8_t colors)
+{
+	ao_led_state = colors;
+	ao_led_apply();
+}
+
+void
+ao_led_toggle(uint8_t colors)
+{
+	ao_led_state ^= colors;
+	ao_led_apply();
+}
+
+void
+ao_led_for(uint8_t colors, uint16_t ticks) __reentrant
+{
+	ao_led_on(colors);
+	ao_delay(ticks);
+	ao_led_off(colors);
+}
+
+void
+ao_led_init(uint8_t enable)
+{
+	ao_enable_output(AO_PCA9922_CS_PORT, AO_PCA9922_CS_PIN, AO_PCA9922_CS, 1);
+}