esp8266: Update port to use new event functions.

This is necessary to avoid watchdog timeout in long i2c.scan(), as
previously machine_i2c.c would call MICROPY_EVENT_POLL_HOOK if
MICROPY_EVENT_POLL_HOOK_FAST was not available.

Compared to previous implementation, this implementation removes the
ets_event_poll() function and calls the SDK function ets_loop_iter() from
MICROPY_INTERNAL_EVENT_HOOK instead.  This allows using the port-agnostic
functions in more places.

There is a small behaviour change, which is that the event loop gets
iterated in a few more places (i.e. anywhere that mp_event_handle_nowait()
is called).  However, this looks like maybe only modselect.c - and is
probably good to process Wi-Fi events in that polling loop.

This work was funded through GitHub Sponsors.

Signed-off-by: Angus Gratton <angus@redyak.com.au>

1 files changed, 2 insertions, 1 deletions

diff --git a/ports/esp8266/uart.c b/ports/esp8266/uart.c
index c0a33acb5..80ae5e617 100644
--- a/ports/esp8266/uart.c
+++ b/ports/esp8266/uart.c
@@ -18,6 +18,7 @@
 #include "c_types.h"
 #include "user_interface.h"
 #include "py/mphal.h"
+#include "py/runtime.h"
 
 // seems that this is missing in the Espressif SDK
 #define FUNC_U0RXD 0
@@ -218,7 +219,7 @@ bool ICACHE_FLASH_ATTR uart_rx_wait(uint32_t timeout_us) {
         if (system_get_time() - start >= timeout_us) {
             return false; // timeout
         }
-        ets_event_poll();
+        mp_event_handle_nowait();
     }
 }