NANO: Reduce ISC I2C frequency to standard.
#define ISC_I2C_ID (0)
#define ISC_I2C_SCL_PIN (2)
#define ISC_I2C_SDA_PIN (31)
-#define ISC_I2C_SPEED (CAMBUS_SPEED_FULL)
+#define ISC_I2C_SPEED (CAMBUS_SPEED_STANDARD)
// I2C0
#define TWI0_ID (0)
