diff options
Diffstat (limited to 'include/hw/i2c/microbit_i2c.h')
-rw-r--r-- | include/hw/i2c/microbit_i2c.h | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/include/hw/i2c/microbit_i2c.h b/include/hw/i2c/microbit_i2c.h new file mode 100644 index 000000000..3c29e09bf --- /dev/null +++ b/include/hw/i2c/microbit_i2c.h @@ -0,0 +1,42 @@ +/* + * Microbit stub for Nordic Semiconductor nRF51 SoC Two-Wire Interface + * http://infocenter.nordicsemi.com/pdf/nRF51_RM_v3.0.1.pdf + * + * Copyright 2019 Red Hat, Inc. + * + * This code is licensed under the GPL version 2 or later. See + * the COPYING file in the top-level directory. + */ + +#ifndef MICROBIT_I2C_H +#define MICROBIT_I2C_H + +#include "hw/sysbus.h" +#include "hw/arm/nrf51.h" +#include "qom/object.h" + +#define NRF51_TWI_TASK_STARTRX 0x000 +#define NRF51_TWI_TASK_STARTTX 0x008 +#define NRF51_TWI_TASK_STOP 0x014 +#define NRF51_TWI_EVENT_STOPPED 0x104 +#define NRF51_TWI_EVENT_RXDREADY 0x108 +#define NRF51_TWI_EVENT_TXDSENT 0x11c +#define NRF51_TWI_REG_ENABLE 0x500 +#define NRF51_TWI_REG_RXD 0x518 +#define NRF51_TWI_REG_TXD 0x51c +#define NRF51_TWI_REG_ADDRESS 0x588 + +#define TYPE_MICROBIT_I2C "microbit.i2c" +OBJECT_DECLARE_SIMPLE_TYPE(MicrobitI2CState, MICROBIT_I2C) + +#define MICROBIT_I2C_NREGS (NRF51_PERIPHERAL_SIZE / sizeof(uint32_t)) + +struct MicrobitI2CState { + SysBusDevice parent_obj; + + MemoryRegion iomem; + uint32_t regs[MICROBIT_I2C_NREGS]; + uint32_t read_idx; +}; + +#endif /* MICROBIT_I2C_H */ |