1/* 2 * Microbit stub for Nordic Semiconductor nRF51 SoC Two-Wire Interface 3 * http://infocenter.nordicsemi.com/pdf/nRF51_RM_v3.0.1.pdf 4 * 5 * Copyright 2019 Red Hat, Inc. 6 * 7 * This code is licensed under the GPL version 2 or later. See 8 * the COPYING file in the top-level directory. 9 */ 10 11#ifndef MICROBIT_I2C_H 12#define MICROBIT_I2C_H 13 14#include "hw/sysbus.h" 15#include "hw/arm/nrf51.h" 16 17#define NRF51_TWI_TASK_STARTRX 0x000 18#define NRF51_TWI_TASK_STARTTX 0x008 19#define NRF51_TWI_TASK_STOP 0x014 20#define NRF51_TWI_EVENT_STOPPED 0x104 21#define NRF51_TWI_EVENT_RXDREADY 0x108 22#define NRF51_TWI_EVENT_TXDSENT 0x11c 23#define NRF51_TWI_REG_ENABLE 0x500 24#define NRF51_TWI_REG_RXD 0x518 25#define NRF51_TWI_REG_TXD 0x51c 26#define NRF51_TWI_REG_ADDRESS 0x588 27 28#define TYPE_MICROBIT_I2C "microbit.i2c" 29#define MICROBIT_I2C(obj) \ 30 OBJECT_CHECK(MicrobitI2CState, (obj), TYPE_MICROBIT_I2C) 31 32#define MICROBIT_I2C_NREGS (NRF51_TWI_SIZE / sizeof(uint32_t)) 33 34typedef struct { 35 SysBusDevice parent_obj; 36 37 MemoryRegion iomem; 38 uint32_t regs[MICROBIT_I2C_NREGS]; 39 uint32_t read_idx; 40} MicrobitI2CState; 41 42#endif /* MICROBIT_I2C_H */ 43