- finish implementation of timers based on PIT

- add [untested] code for timer-based LED blink codes


git-svn-id: https://svn.openpcd.org:2342/trunk@242 6dc7ffe9-61d6-0310-9af1-9938baff3ed1

1 files changed, 101 insertions, 0 deletions

diff --git a/firmware/src/os/blinkcode.c b/firmware/src/os/blinkcode.c
new file mode 100644
index 0000000..8485392
--- /dev/null
+++ b/firmware/src/os/blinkcode.c
@@ -0,0 +1,101 @@
+/* SAM7DFU blink code support 
+ * (C) 2006 by Harald Welte <laforge@gnumonks.org>
+ *
+ */
+
+#include <os/pit.h>
+#include <os/dbgu.h>
+#include <os/led.h>
+#include <os/blinkcode.h>
+
+#define NUM_LEDS 2
+
+enum blinkcode_state {
+	BLINKCODE_STATE_NONE,
+	BLINKCODE_STATE_SILENT,		/* period of silence at start */
+	BLINKCODE_STATE_INIT,		/* initial long light */
+	BLINKCODE_STATE_BLINK_OFF,	/* blinking out, currently off */
+	BLINKCODE_STATE_BLINK_ON,	/* blinking out, currently on */
+	BLINKCODE_STATE_DONE,
+};
+
+#define TIME_SILENT	(1000)
+#define TIME_INIT	(1000)
+#define TIME_BLINK	(100)
+
+struct blinker {
+	struct timer_list timer;
+	enum blinkcode_state state;
+	int8_t num;
+	u_int8_t led;
+};
+
+static struct blinker blink_state[NUM_LEDS];
+
+static void blinkcode_cb(void *data)
+{
+	/* we got called back by the timer */
+	struct blinker *bl = data;
+
+	switch (bl->state) {
+	case BLINKCODE_STATE_NONE:
+		led_switch(bl->led, 0);
+		bl->state = BLINKCODE_STATE_SILENT;
+		bl->timer.expires = jiffies + TIME_SILENT;
+		break;
+	case BLINKCODE_STATE_SILENT:
+		/* we've finished the period of silence, turn led on */
+		led_switch(bl->led, 1);
+		bl->state = BLINKCODE_STATE_INIT;
+		bl->timer.expires = jiffies + TIME_INIT;
+		break;
+	case BLINKCODE_STATE_INIT:
+		/* we've finished the period of init */
+		led_switch(bl->led, 0);
+		bl->state = BLINKCODE_STATE_BLINK_OFF;
+		bl->timer.expires = jiffies + TIME_BLINK;
+		break;
+	case BLINKCODE_STATE_BLINK_OFF:
+		/* we've been off, turn on */
+		led_switch(bl->led, 1);
+		bl->state = BLINKCODE_STATE_BLINK_ON;
+		bl->num--;
+		if (bl->num <= 0) {
+			bl->state = BLINKCODE_STATE_NONE;
+			return;
+		}
+		break;
+	case BLINKCODE_STATE_BLINK_ON:
+		/* we've been on, turn off */
+		led_switch(bl->led, 0);
+		bl->state = BLINKCODE_STATE_BLINK_OFF;
+		break;
+	}
+	/* default case: re-add the timer */
+	timer_add(&bl->timer);
+}
+
+void blinkcode_set(int led, enum blinkcode_num num)
+{
+	if (led >= NUM_LEDS)
+		return;
+
+	timer_del(&blink_state[led].timer);
+
+	blink_state[led].num = num;
+	blink_state[led].state = BLINKCODE_STATE_NONE;
+
+	if (num != BLINKCODE_NONE)
+		timer_add(&blink_state[led].timer);
+}
+
+void blinkcode_init(void)
+{
+	int i;
+
+	for (i = 0; i < NUM_LEDS; i++) {
+		blink_state[i].num = 0;
+		blink_state[i].state = BLINKCODE_STATE_NONE;
+		blink_state[i].led = i+1;
+	}
+}