nrf52820_microbit: Set I2C protocol to v1 until busy flag is implemented.

Author: microbit-carlos

source/board/microbitv2/i2c_commands.h

@@ -37,7 +37,12 @@ extern "C" {
 #define I2C_SLAVE_HID               (0x71U)
 #define I2C_SLAVE_FLASH             (0x72U)
 
+// Busy flag not yet implemented in nRF52
+#if defined(INTERFACE_NRF52820)
+#define I2C_PROTOCOL_VERSION        (0x01)
+#else 
 #define I2C_PROTOCOL_VERSION        (0x02)
+#endif
 
 /*! i2c command Id type enumeration */
 typedef enum cmdId_tag {