esp32/machine_i2c.c: Fix default I2C pins for C3 and S3 variants.

This addresses issue micropython#17103.

The new default I2C init does not require setting SCL or SDA but
the default pins for C3 (and S3?) conflict with the espressif
GPIO usage.
For the C3, pins 18/19 are for USB/JTAG. If used for
I2C() they will cause the REPL to hang on initialization of the I2C.
For the S3 pin 19 is allocated for USB/JTAG also but the
defaults do not seem to affect the REPL.

See PR micropython#16956
See Issue micropython#17103

Signed-off-by: Rick Sorensen <[email protected]>

Author: ricksorensen

ports/esp32/machine_i2c.c

@@ -35,9 +35,14 @@
 #if MICROPY_PY_MACHINE_I2C || MICROPY_PY_MACHINE_SOFTI2C
 
 #ifndef MICROPY_HW_I2C0_SCL
+#if CONFIG_IDF_TARGET_ESP32C3 || CONFIG_IDF_TARGET_ESP32S3
+#define MICROPY_HW_I2C0_SCL (GPIO_NUM_7)
+#define MICROPY_HW_I2C0_SDA (GPIO_NUM_6)
+#else
 #define MICROPY_HW_I2C0_SCL (GPIO_NUM_18)
 #define MICROPY_HW_I2C0_SDA (GPIO_NUM_19)
 #endif
+#endif
 
 #ifndef MICROPY_HW_I2C1_SCL
 #if CONFIG_IDF_TARGET_ESP32