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/*
* Copyright (c) 2006-2021, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2020-11-15 xckhmf First Verison
* 2021-11-27 chenyingchun fix _master_xfer bug
*
*/
#include <rtdevice.h>
#include <nrfx_twi_twim.h>
#include <nrfx_twim.h>
#include <drv_i2c.h>
#if defined(BSP_USING_I2C0) || defined(BSP_USING_I2C1)
typedef struct
{
nrf_twim_frequency_t freq;
uint32_t scl_pin;
uint32_t sda_pin;
nrfx_twim_t twi_instance;
}drv_i2c_cfg_t;
#ifdef BSP_USING_I2C0
static drv_i2c_cfg_t drv_i2c_0 =
{
.freq = NRF_TWIM_FREQ_400K,
.scl_pin = BSP_I2C0_SCL_PIN,
.sda_pin = BSP_I2C0_SDA_PIN,
.twi_instance = NRFX_TWIM_INSTANCE(0)
};
static struct rt_i2c_bus_device i2c0_bus;
#endif
#ifdef BSP_USING_I2C1
static drv_i2c_cfg_t drv_i2c_1 =
{
.freq = NRF_TWIM_FREQ_400K,
.scl_pin = BSP_I2C1_SCL_PIN,
.sda_pin = BSP_I2C1_SDA_PIN,
.twi_instance = NRFX_TWIM_INSTANCE(1)
};
static struct rt_i2c_bus_device i2c1_bus;
#endif
static int twi_master_init(struct rt_i2c_bus_device *bus)
{
nrfx_err_t rtn;
nrfx_twim_config_t config = NRFX_TWIM_DEFAULT_CONFIG(0,0);
drv_i2c_cfg_t *p_cfg = bus->priv;
nrfx_twim_t const * p_instance = &p_cfg->twi_instance;
config.frequency = p_cfg->freq;
config.scl = p_cfg->scl_pin;
config.sda = p_cfg->sda_pin;
nrfx_twi_twim_bus_recover(config.scl,config.sda);
rtn = nrfx_twim_init(p_instance,&config,NULL,NULL);
if (rtn != NRFX_SUCCESS)
{
return rtn;
}
nrfx_twim_enable(p_instance);
return 0;
}
static rt_size_t _master_xfer(struct rt_i2c_bus_device *bus,
struct rt_i2c_msg msgs[],
rt_uint32_t num)
{
struct rt_i2c_msg *msg;
nrfx_twim_t const *p_instance = &((drv_i2c_cfg_t *)bus->priv)->twi_instance;
nrfx_err_t ret = NRFX_ERROR_INTERNAL;
uint32_t no_stop_flag = 0;
rt_int32_t i = 0;
for (i = 0; i < num; i++)
{
msg = &msgs[i];
nrfx_twim_xfer_desc_t xfer = NRFX_TWIM_XFER_DESC_TX(msg->addr, msg->buf, msg->len);
if (msg->flags & RT_I2C_RD)
{
xfer.type = NRFX_TWIM_XFER_RX;
}
else
{
xfer.type = NRFX_TWIM_XFER_TX;
if (msg->flags & RT_I2C_NO_READ_ACK)
{
no_stop_flag = NRFX_TWIM_FLAG_TX_NO_STOP;
}
}
ret = nrfx_twim_xfer(p_instance, &xfer, no_stop_flag);
if (ret != NRFX_SUCCESS)
{
goto out;
}
}
out:
return i;
}
static const struct rt_i2c_bus_device_ops _i2c_ops =
{
_master_xfer,
NULL,
NULL,
};
int rt_hw_i2c_init(void)
{
#ifdef BSP_USING_I2C0
i2c0_bus.ops= &_i2c_ops;
i2c0_bus.timeout = 0;
i2c0_bus.priv = (void *)&drv_i2c_0;
twi_master_init(&i2c0_bus);
rt_i2c_bus_device_register(&i2c0_bus, "i2c0");
#endif
#ifdef BSP_USING_I2C1
i2c1_bus.ops= &_i2c_ops;
i2c1_bus.timeout = 0;
i2c1_bus.priv = (void *)&drv_i2c_1;
twi_master_init(&i2c1_bus);
rt_i2c_bus_device_register(&i2c1_bus, "i2c1");
#endif
return 0;
}
INIT_BOARD_EXPORT(rt_hw_i2c_init);
#endif /* defined(BSP_USING_I2C0) || defined(BSP_USING_I2C1) */
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