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/*
* Copyright (c)
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Email Notes
* 2022-04-11 Kevin.Liu [email protected] First Release
*/
#include <rtthread.h>
#include <rtdevice.h>
#include <atmel_start.h>
#ifdef SAM_I2C_EXAMPLE
struct sam_i2c_bus
{
struct rt_i2c_bus_device parent;
struct i2c_m_sync_desc *i2c_desc;
char *device_name;
};
#define I2CBUS_NAME "i2c0"
static struct sam_i2c_bus sam_i2c0 =
{
.i2c_desc = &I2C_0,
.device_name = I2CBUS_NAME,
};
static rt_ssize_t sam_i2c_master_xfer(struct rt_i2c_bus_device *bus,
struct rt_i2c_msg msgs[],
rt_uint32_t num);
static rt_ssize_t sam_i2c_slave_xfer(struct rt_i2c_bus_device *bus,
struct rt_i2c_msg msgs[],
rt_uint32_t num);
static rt_err_t sam_i2c_bus_control(struct rt_i2c_bus_device *bus,
rt_uint32_t, rt_uint32_t);
static const struct rt_i2c_bus_device_ops sam_i2c_ops =
{
.master_xfer = sam_i2c_master_xfer,
.slave_xfer = sam_i2c_slave_xfer,
.i2c_bus_control = sam_i2c_bus_control,
};
static inline void sam_i2c_update_control(struct rt_i2c_msg *src,
struct _i2c_m_msg *dest)
{
dest->len = (int32_t)src->len;
dest->addr = src->addr;
dest->buffer = src->buf;
/* Get I2C message R/W attribute first */
dest->flags = dest->flags & 0x0001;
if (dest->flags & RT_I2C_ADDR_10BIT)
dest->flags |= I2C_M_TEN;
else
dest->flags |= I2C_M_SEVEN;
}
static rt_ssize_t sam_i2c_master_xfer(struct rt_i2c_bus_device *bus,
struct rt_i2c_msg msgs[],
rt_uint32_t num)
{
struct sam_i2c_bus *sam_i2c = (struct sam_i2c_bus *)bus;
struct _i2c_m_msg i2c_msg;
rt_size_t i;
RT_ASSERT(bus != RT_NULL);
for (i = 0; i < num; i++)
{
sam_i2c_update_control(&msgs[i], &i2c_msg);
if (i2c_m_sync_transfer(sam_i2c->i2c_desc, &i2c_msg) != 0)
break;
}
return i;
}
static rt_ssize_t sam_i2c_slave_xfer(struct rt_i2c_bus_device *bus,
struct rt_i2c_msg msgs[],
rt_uint32_t num)
{
return 0;
}
static rt_err_t sam_i2c_bus_control(struct rt_i2c_bus_device *bus,
rt_uint32_t cmd,
rt_uint32_t arg)
{
return RT_ERROR;
struct sam_i2c_bus *sam_i2c = (struct sam_i2c_bus *)bus;
RT_ASSERT(bus != RT_NULL);
switch (cmd)
{
case RT_I2C_DEV_CTRL_CLK:
i2c_m_sync_set_baudrate(sam_i2c->i2c_desc, 0, arg);
break;
default:
return -RT_EIO;
}
return RT_EOK;
}
int rt_hw_i2c_init(void)
{
rt_i2c_bus_device_register(&sam_i2c0.parent, sam_i2c0.device_name);
return 0;
}
#ifdef RT_USING_COMPONENTS_INIT
INIT_BOARD_EXPORT(rt_hw_i2c_init);
#endif
#endif
/*@}*/
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