From 82e31518b134cfd90eda8c096b971903a97708c0 Mon Sep 17 00:00:00 2001
From: David Lamparter <equinox@diac24.net>
Date: Thu, 20 Sep 2012 05:18:03 +0200
Subject: lightctrl: 1 second system tick

---
 can.c       |  3 +++
 dali_ctl.c  |  2 ++
 lightctrl.c |  4 ++++
 tick.c      | 37 +++++++++++++++++++++++++++++++++++++
 4 files changed, 46 insertions(+)
 create mode 100644 tick.c

diff --git a/can.c b/can.c
index 8e446d1..8969b7c 100644
--- a/can.c
+++ b/can.c
@@ -172,6 +172,9 @@ static void can_int(void)
 {
 	uint8_t canintf, eflg, canstat;
 
+#ifdef HAVE_TICK
+	uart_puttick();
+#endif
 	uart_puts("can: irqh<");
 
 	spi_ss(0);
diff --git a/dali_ctl.c b/dali_ctl.c
index b5eb66b..5db3c09 100644
--- a/dali_ctl.c
+++ b/dali_ctl.c
@@ -96,6 +96,7 @@ static void dali_search(void)
 		if (!dali_s_notfound) {
 			wdt_reset();
 
+			uart_puttick();
 			uart_puts("dali scan found\t\t");
 			uart_puthex(dali_sh);
 			uart_puthex(dali_sm);
@@ -143,6 +144,7 @@ static void dali_search(void)
 	wdt_reset();
 
 	dali_twice(DALI_C_TERMINATE);
+	uart_puttick();
 	uart_puts("dali scan end\n");
 
 	eeprom_write_byte(&dali_nextaddr, dali_assign);
diff --git a/lightctrl.c b/lightctrl.c
index 659ac26..0a46805 100644
--- a/lightctrl.c
+++ b/lightctrl.c
@@ -24,6 +24,7 @@ const uint8_t __signature[3] __attribute__((section (".signature"), used)) =
 #define D_TAST	7
 
 #include "uart.c"
+#include "tick.c"
 #include "dali2.c"
 #include "dali_ctl.c"
 #include "dim.c"
@@ -74,6 +75,7 @@ int main(void)
 	PORTD &= ~(1 << D_LED1);
 
 	uart_init();
+	tick_init();
 	can_preinit();
 	dali_init();
 	dim_init();
@@ -138,6 +140,7 @@ int main(void)
 				uint8_t buffer[8] = {0, 0, 0, 0, 0, 0, 0, 0};
 				uint8_t base = (ctr << 1) & 070, map = dali_map[(ctr >> 2) & 7], dlc = 0;
 
+				uart_puttick();
 				uart_puts("ll");
 				uart_puthex(base);
 				uart_puts("> ");
@@ -161,6 +164,7 @@ int main(void)
 		case 1024:
 			can_send(0xe7000000, 8, (uint8_t *)&dalistat);
 
+			uart_puttick();
 			uart_puts("dali stats: ");
 			uart_puthex16(dalistat.rxok);
 			uart_puts(" ok  ");
diff --git a/tick.c b/tick.c
new file mode 100644
index 0000000..87dcbc6
--- /dev/null
+++ b/tick.c
@@ -0,0 +1,37 @@
+#define HAVE_TICK
+
+static union {
+	uint32_t u32;
+	uint8_t u8[4];
+} systick = { .u32 = 0 };
+
+ISR(TIMER1_COMPA_vect)
+{
+	systick.u32++;
+}
+
+static void uart_puttick(void)
+{
+	uint16_t frac = TCNT1;
+	_uart_putch('@');
+	uart_puthex(systick.u8[3]);
+	uart_puthex(systick.u8[2]);
+	uart_puthex(systick.u8[1]);
+	uart_puthex(systick.u8[0]);
+	_uart_putch('.');
+	uart_puthex16(frac);
+	_uart_putch(' ');
+}
+
+static void tick_init(void)
+{
+	TCCR1A = 0;
+	TCCR1B = (1 << WGM12) | (1 << CS12) | (0 << CS11) | (0 << CS10); // 8 MHz / 256 = 31250 Hz
+	asm volatile ("" ::: "memory");
+	TCNT1 = 0;
+	OCR1A = 31249; // 1 Hz
+	asm volatile ("" ::: "memory");
+	TIFR1 = (1 << OCF1A);
+	TIMSK1 = (1 << OCIE1A);
+}
+
-- 
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