esp32: Add time.Now() support

Author: aykevl

ports/esp32/main.c

@@ -83,3 +83,11 @@ void tinygo_fatal() {
 // TODO: this only resets the CPUs, not the peripherals
 esp_restart();
 }
+
+struct tinygo_now tinygo_now() {
+struct tinygo_now ret;
+int64_t micros = esp_timer_get_time();
+ret.sec = micros / 1000 / 1000;
+ret.nsec = (micros - (uint64_t)ret.sec * 1000ULL * 1000ULL) * 1000;
+return ret;
+}

src/runtime/tinygo.h

@@ -63,6 +63,8 @@ void tinygo_fatal(); // exit process or reset chip
 
 __attribute__((noreturn))
 void runtime_Panic(struct __go_empty_interface msg, bool fatal) __asm__("runtime.Panic");
+struct tinygo_now { uint64_t sec; uint64_t nsec; };
+struct tinygo_now tinygo_now() __asm__("time.now");
 void tinygo_sleep(int64_t sleeptime) __asm__("time.Sleep");
 void tinygo_semacquire(volatile uint32_t *addr, bool profile) __asm__("sync.runtime_Semacquire");
 void tinygo_semrelease(volatile uint32_t *addr) __asm__("sync.runtime_Semrelease");