Make timer mandatory for data manager

The NULL check was a bit of a hack to get the test building. Probably a bad
idea to leave it around, since there's no time it's sane to leave the
timestamps on data manager contexts unset.

1 files changed, 29 insertions, 0 deletions

diff --git a/timer_linux.c b/timer_linux.c
new file mode 100644
index 0000000..56886e3
--- /dev/null
+++ b/timer_linux.c
@@ -0,0 +1,29 @@
+#include <time.h>
+#include <stdint.h>
+
+#include "timer.h"
+
+/* On POSIX, we emulate a monotonic 16-bit timer for timestamping events in
+ * lieu of timer3 on the AVR.
+ */
+
+static void timer_init(void)
+{
+	/* do nothing */
+}
+
+static uint16_t timer_get_value(void)
+{
+	struct timespec ts;
+	clock_gettime(CLOCK_MONOTONIC, &ts);
+	/* FIXME abort on error */
+	/* return milliseconds as uint16_t, truncating the rest */
+	return ts.tv_nsec / 1e6;
+}
+
+
+void get_system_timer(struct timer *timer)
+{
+	timer->init = timer_init;
+	timer->get_time = timer_get_value;
+}