Merge pull request #9942 from dhalbert/i2c-probe-delay

ports/espressif/common-hal/busio/I2C.c: add delay after probe

Author: dhalbert

ports/espressif/common-hal/busio/I2C.c

@@ -6,6 +6,7 @@
 
 #include "shared-bindings/busio/I2C.h"
 #include "py/mperrno.h"
+#include "py/mphal.h"
 #include "py/runtime.h"
 
 #include "components/driver/i2c/include/driver/i2c.h"
@@ -134,6 +135,12 @@ void common_hal_busio_i2c_deinit(busio_i2c_obj_t *self) {
 
 bool common_hal_busio_i2c_probe(busio_i2c_obj_t *self, uint8_t addr) {
     esp_err_t result = i2c_master_probe(self->handle, addr, 10);
+
+    #if defined(CONFIG_IDF_TARGET_ESP32S2)
+    // ESP32-S2 gives spurious results when probe is called multiple times in succession without this delay.
+    mp_hal_delay_ms(1);
+    #endif
+
     return result == ESP_OK;
 }