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 #include "qom/object.h" 17 18 #define NRF51_TWI_TASK_STARTRX 0x000 19 #define NRF51_TWI_TASK_STARTTX 0x008 20 #define NRF51_TWI_TASK_STOP 0x014 21 #define NRF51_TWI_EVENT_STOPPED 0x104 22 #define NRF51_TWI_EVENT_RXDREADY 0x108 23 #define NRF51_TWI_EVENT_TXDSENT 0x11c 24 #define NRF51_TWI_REG_ENABLE 0x500 25 #define NRF51_TWI_REG_RXD 0x518 26 #define NRF51_TWI_REG_TXD 0x51c 27 #define NRF51_TWI_REG_ADDRESS 0x588 28 29 #define TYPE_MICROBIT_I2C "microbit.i2c" 30 typedef struct MicrobitI2CState MicrobitI2CState; 31 DECLARE_INSTANCE_CHECKER(MicrobitI2CState, MICROBIT_I2C, 32 TYPE_MICROBIT_I2C) 33 34 #define MICROBIT_I2C_NREGS (NRF51_PERIPHERAL_SIZE / sizeof(uint32_t)) 35 36 struct MicrobitI2CState { 37 SysBusDevice parent_obj; 38 39 MemoryRegion iomem; 40 uint32_t regs[MICROBIT_I2C_NREGS]; 41 uint32_t read_idx; 42 }; 43 44 #endif /* MICROBIT_I2C_H */ 45