improve time.monotonic_ns() accuracy from ms to us

Author: dhalbert

locale/circuitpython.pot

@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PACKAGE VERSION\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2020-02-05 15:55-0800\n"
+"POT-Creation-Date: 2020-02-07 10:02-0500\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language-Team: LANGUAGE <[email protected]>\n"

ports/atmel-samd/common-hal/time/__init__.c

@@ -29,11 +29,20 @@
 #include "shared-bindings/time/__init__.h"
 
 #include "supervisor/shared/tick.h"
+#include "tick.h"
 
 inline uint64_t common_hal_time_monotonic() {
     return supervisor_ticks_ms64();
 }
 
+uint64_t common_hal_time_monotonic_ns() {
+    uint64_t ms;
+    uint32_t us_until_ms;
+    current_tick(&ms, &us_until_ms);
+    // us counts down.
+    return 1000 * (ms * 1000 + (1000 - us_until_ms));
+}
+
 void common_hal_time_delay_ms(uint32_t delay) {
     mp_hal_delay_ms(delay);
 }

ports/cxd56/common-hal/time/__init__.c

@@ -24,6 +24,8 @@
  * THE SOFTWARE.
  */
 
+#include <sys/time.h>
+
 #include "py/mphal.h"
 
 #include "supervisor/shared/tick.h"
@@ -32,6 +34,12 @@ uint64_t common_hal_time_monotonic(void) {
     return supervisor_ticks_ms64();
 }
 
+uint64_t common_hal_time_monotonic_ns() {
+    struct timeval tv;
+    gettimeofday(&tv, NULL);
+    return 1000 * ((uint64_t) tv.tv_sec * 1000000 + (uint64_t) tv.tv_usec);
+}
+
 void common_hal_time_delay_ms(uint32_t delay) {
     mp_hal_delay_ms(delay);
 }

ports/mimxrt10xx/common-hal/time/__init__.c

@@ -30,10 +30,20 @@
 
 #include "supervisor/shared/tick.h"
 
+#include "tick.h"
+
 inline uint64_t common_hal_time_monotonic() {
     return supervisor_ticks_ms64();
 }
 
+uint64_t common_hal_time_monotonic_ns() {
+    uint64_t ms;
+    uint32_t us_until_ms;
+    current_tick(&ms, &us_until_ms);
+    // us counts down.
+    return 1000 * (ms * 1000 + (1000 - us_until_ms));
+}
+
 void common_hal_time_delay_ms(uint32_t delay) {
     mp_hal_delay_ms(delay);
 }

ports/nrf/common-hal/time/__init__.c

@@ -32,6 +32,14 @@ uint64_t common_hal_time_monotonic(void) {
     return supervisor_ticks_ms64();
 }
 
+uint64_t common_hal_time_monotonic_ns() {
+    uint64_t ms;
+    uint32_t us_until_ms;
+    current_tick(&ms, &us_until_ms);
+    // us counts down.
+    return 1000 * (ms * 1000 + (1000 - us_until_ms));
+}
+
 void common_hal_time_delay_ms(uint32_t delay) {
     mp_hal_delay_ms(delay);
 }

ports/stm32f4/common-hal/time/__init__.c

@@ -32,6 +32,14 @@ uint64_t common_hal_time_monotonic(void) {
     return supervisor_ticks_ms64();
 }
 
+uint64_t common_hal_time_monotonic_ns() {
+    uint64_t ms;
+    uint32_t us_until_ms;
+    current_tick(&ms, &us_until_ms);
+    // us counts down.
+    return 1000 * (ms * 1000 + (1000 - us_until_ms));
+}
+
 void common_hal_time_delay_ms(uint32_t delay) {
     mp_hal_delay_ms(delay);
 }

shared-bindings/time/__init__.c

@@ -216,7 +216,7 @@ MP_DEFINE_CONST_FUN_OBJ_0(time_time_obj, time_time);
 //|   :rtype: int
 //|
 STATIC mp_obj_t time_monotonic_ns(void) {
-    uint64_t time64 = common_hal_time_monotonic() * 1000000llu;
+    uint64_t time64 = common_hal_time_monotonic_ns();
     return mp_obj_new_int_from_ll((long long) time64);
 }
 MP_DEFINE_CONST_FUN_OBJ_0(time_monotonic_ns_obj, time_monotonic_ns);

shared-bindings/time/__init__.h

@@ -36,6 +36,7 @@ extern mp_obj_t struct_time_from_tm(timeutils_struct_time_t *tm);
 extern void struct_time_to_tm(mp_obj_t t, timeutils_struct_time_t *tm);
 
 extern uint64_t common_hal_time_monotonic(void);
+extern uint64_t common_hal_time_monotonic_ns(void);
 extern void common_hal_time_delay_ms(uint32_t);
 
 #endif  // MICROPY_INCLUDED_SHARED_BINDINGS_TIME___INIT___H