2 files changed, 34 insertions, 18 deletions

diff --git a/ports/esp32s2/supervisor/port.c b/ports/esp32s2/supervisor/port.c
index 2aa01cb15..46de63627 100644
--- a/ports/esp32s2/supervisor/port.c
+++ b/ports/esp32s2/supervisor/port.c
@@ -30,6 +30,7 @@
 #include "supervisor/port.h"
 #include "boards/board.h"
 #include "modules/module.h"
+#include "py/runtime.h"
 
 #include "freertos/FreeRTOS.h"
 #include "freertos/task.h"
@@ -54,6 +55,7 @@
 
 uint32_t* heap;
 uint32_t heap_size;
+extern TaskHandle_t xTaskToNotify;
 
 STATIC esp_timer_handle_t _tick_timer;
 
@@ -188,34 +190,28 @@ void port_disable_tick(void) {
     esp_timer_stop(_tick_timer);
 }
 
-TickType_t sleep_time_set;
 TickType_t sleep_time_duration;
+uint32_t NotifyValue = 0;
+BaseType_t notify_wait = 0;
+
 void port_interrupt_after_ticks(uint32_t ticks) {
-    sleep_time_set = xTaskGetTickCount();
-    sleep_time_duration = ticks / portTICK_PERIOD_MS;
-    // esp_sleep_enable_timer_wakeup(uint64_t time_in_us)
+    sleep_time_duration = (ticks * 100)/1024;
+    xTaskToNotify = xTaskGetCurrentTaskHandle();
 }
 
 void port_sleep_until_interrupt(void) {
-    // FreeRTOS delay here maybe.
-    // Light sleep shuts down BLE and wifi.
-    // esp_light_sleep_start()
+
     if (sleep_time_duration == 0) {
         return;
     }
-    // Need to run in a loop in order to check if CTRL-C was received
-     TickType_t start_ticks = 0;
-     while (sleep_time_duration > start_ticks ) {
-       vTaskDelayUntil(&sleep_time_set, 1);
-       if ( mp_hal_is_interrupted()  ) {
-         mp_handle_pending();
-       }
-       start_ticks = start_ticks + 1;
-      }
-
+    notify_wait = xTaskNotifyWait(0x01,0x01,&NotifyValue,
+                             sleep_time_duration );
+    if (NotifyValue == 1) {
+      xTaskToNotify = NULL;
+      mp_handle_pending();
+    }
 }
 
-
 // Wrap main in app_main that the IDF expects.
 extern void main(void);
 void app_main(void) {
diff --git a/ports/esp32s2/supervisor/usb.c b/ports/esp32s2/supervisor/usb.c
index 1ad6af047..86186d36b 100644
--- a/ports/esp32s2/supervisor/usb.c
+++ b/ports/esp32s2/supervisor/usb.c
@@ -52,6 +52,8 @@
 StackType_t  usb_device_stack[USBD_STACK_SIZE];
 StaticTask_t usb_device_taskdef;
 
+TaskHandle_t xTaskToNotify = NULL;
+
 // USB Device Driver task
 // This top level thread process all usb events and invoke callbacks
 void usb_device_task(void* param)
@@ -114,3 +116,21 @@ void init_usb_hardware(void) {
                              usb_device_stack,
                              &usb_device_taskdef);
 }
+/**
+ * Callback invoked when received an "wanted" char.
+ * @param itf           Interface index (for multiple cdc interfaces)
+ * @param wanted_char   The wanted char (set previously)
+ */
+void tud_cdc_rx_wanted_cb(uint8_t itf, char wanted_char)
+{
+    (void) itf; // not used
+    // Workaround for using lib/utils/interrupt_char.c
+    // Compare mp_interrupt_char with wanted_char and ignore if not matched
+    if (mp_interrupt_char == wanted_char) {
+        tud_cdc_read_flush();    // flush read fifo
+        mp_keyboard_interrupt();
+        if (xTaskToNotify != NULL) {
+          xTaskNotifyGive(xTaskToNotify);
+        }
+    }
+}