ports/zephyr: Add machine lightsleep.

Author: ThinkTransit

ports/zephyr/boards/beagleconnect_freedom.conf

@@ -5,3 +5,7 @@ CONFIG_SPI=y
 # Flash drivers
 CONFIG_FLASH=y
 CONFIG_FLASH_MAP=y
+
+# Disable PM
+CONFIG_PM=n
+CONFIG_PM_DEVICE=n

ports/zephyr/modmachine.c

@@ -64,6 +64,7 @@ static void mp_machine_idle(void) {
     k_yield();
 }
 
+#if defined(CONFIG_PM_DEVICE) && defined(CONFIG_PM)
 static void mp_machine_lightsleep(size_t n_args, const mp_obj_t *args) {
     mp_int_t milliseconds = mp_obj_get_int(args[0]);
     // Get the UART device
@@ -74,6 +75,11 @@ static void mp_machine_lightsleep(size_t n_args, const mp_obj_t *args) {
     // Set UART device back to active state
     pm_device_action_run(uart0, PM_DEVICE_ACTION_RESUME);
 }
+#else
+static void mp_machine_lightsleep(size_t n_args, const mp_obj_t *args) {
+    mp_raise_ValueError(MP_ERROR_TEXT("not implemented"));
+}
+#endif
 
 static void mp_machine_deepsleep(size_t n_args, const mp_obj_t *args) {
     mp_raise_ValueError(MP_ERROR_TEXT("not implemented"));