From ceffd2f8685d34ab4d6ed547553d4d777d77e5dd Mon Sep 17 00:00:00 2001
From: David Lamparter <equinox@diac24.net>
Date: Thu, 6 Jun 2013 23:01:57 +0200
Subject: lightctrl: cooldown timer for DALI EVGs

---
 lightctrl.c | 26 ++++++++++++++++++++++++--
 1 file changed, 24 insertions(+), 2 deletions(-)

diff --git a/lightctrl.c b/lightctrl.c
index e1a4916..443359c 100644
--- a/lightctrl.c
+++ b/lightctrl.c
@@ -29,6 +29,7 @@ const uint8_t __signature[3] __attribute__((section (".signature"), used)) =
 #define D_TAST	7
 
 static uint8_t target[0x40] = { 0 };
+static uint8_t cooldown[0x40] = { 0 };
 static void target_set(uint8_t dst, uint8_t val);
 
 #include "uart.c"
@@ -47,6 +48,23 @@ static uint16_t ctr = 0;
 #define CTR_SENDSTATE	0x200
 #define CTR_SENDEND	0x230
 
+#define T_EVG_COOLDOWN	200	// * 5ms = 1s cooldown after switchoff
+
+static void target_cooldown(void)
+{
+	for (uint8_t i = 0; i < 0x40; i++)
+		if (cooldown[i]) {
+			cooldown[i]--;
+			if ((cooldown[i] == 0) && target[i]) {
+				uint8_t val = target[i];
+				if (val == 0xff)
+					val = 0xfe;
+				dali_send((i << 9) | 0x108);
+				dali_send((i << 9) | val);
+			}
+		}
+}
+
 static void target_set(uint8_t dst, uint8_t val)
 {
 	target[dst] = val;
@@ -59,12 +77,15 @@ static void target_set(uint8_t dst, uint8_t val)
 
 	if (!val) {
 		dali_send((dst << 9) | 0x100);
+		cooldown[dst] = T_EVG_COOLDOWN;
 	} else {
 		if (val == 0xff)
 			val = 0xfe;
 
-		dali_send((dst << 9) | 0x108);
-		dali_send((dst << 9) | val);
+		if (!cooldown[dst]) {
+			dali_send((dst << 9) | 0x108);
+			dali_send((dst << 9) | val);
+		}
 	}
 
 	/* clear timer to trigger immediate updates on CAN */
@@ -252,6 +273,7 @@ int main(void)
 
 		_delay_ms(5);
 		do_tick();
+		target_cooldown();
 
 		ctr++;
 		switch (ctr) {
-- 
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