i2c_core.c
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/*
* Copyright (c) 2006-2021, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2012-04-25 weety first version
* 2021-04-20 RiceChen added support for bus control api
*/
#include <rtdevice.h>
#define DBG_TAG "I2C"
#ifdef RT_I2C_DEBUG
#define DBG_LVL DBG_LOG
#else
#define DBG_LVL DBG_INFO
#endif
#include <rtdbg.h>
rt_err_t rt_i2c_bus_device_register(struct rt_i2c_bus_device *bus,
const char *bus_name)
{
rt_err_t res = RT_EOK;
rt_mutex_init(&bus->lock, "i2c_bus_lock", RT_IPC_FLAG_PRIO);
if (bus->timeout == 0) bus->timeout = RT_TICK_PER_SECOND;
res = rt_i2c_bus_device_device_init(bus, bus_name);
LOG_I("I2C bus [%s] registered", bus_name);
return res;
}
struct rt_i2c_bus_device *rt_i2c_bus_device_find(const char *bus_name)
{
struct rt_i2c_bus_device *bus;
rt_device_t dev = rt_device_find(bus_name);
if (dev == RT_NULL || dev->type != RT_Device_Class_I2CBUS)
{
LOG_E("I2C bus %s not exist", bus_name);
return RT_NULL;
}
bus = (struct rt_i2c_bus_device *)dev->user_data;
return bus;
}
rt_size_t rt_i2c_transfer(struct rt_i2c_bus_device *bus,
struct rt_i2c_msg msgs[],
rt_uint32_t num)
{
rt_size_t ret;
if (bus->ops->master_xfer)
{
#ifdef RT_I2C_DEBUG
for (ret = 0; ret < num; ret++)
{
LOG_D("msgs[%d] %c, addr=0x%02x, len=%d", ret,
(msgs[ret].flags & RT_I2C_RD) ? 'R' : 'W',
msgs[ret].addr, msgs[ret].len);
}
#endif
rt_mutex_take(&bus->lock, RT_WAITING_FOREVER);
ret = bus->ops->master_xfer(bus, msgs, num);
rt_mutex_release(&bus->lock);
return ret;
}
else
{
LOG_E("I2C bus operation not supported");
return 0;
}
}
rt_err_t rt_i2c_control(struct rt_i2c_bus_device *bus,
rt_uint32_t cmd,
rt_uint32_t arg)
{
rt_err_t ret;
if(bus->ops->i2c_bus_control)
{
ret = bus->ops->i2c_bus_control(bus, cmd, arg);
return ret;
}
else
{
LOG_E("I2C bus operation not supported");
return 0;
}
}
rt_size_t rt_i2c_master_send(struct rt_i2c_bus_device *bus,
rt_uint16_t addr,
rt_uint16_t flags,
const rt_uint8_t *buf,
rt_uint32_t count)
{
rt_err_t ret;
struct rt_i2c_msg msg;
msg.addr = addr;
msg.flags = flags;
msg.len = count;
msg.buf = (rt_uint8_t *)buf;
ret = rt_i2c_transfer(bus, &msg, 1);
return (ret > 0) ? count : ret;
}
rt_size_t rt_i2c_master_recv(struct rt_i2c_bus_device *bus,
rt_uint16_t addr,
rt_uint16_t flags,
rt_uint8_t *buf,
rt_uint32_t count)
{
rt_err_t ret;
struct rt_i2c_msg msg;
RT_ASSERT(bus != RT_NULL);
msg.addr = addr;
msg.flags = flags | RT_I2C_RD;
msg.len = count;
msg.buf = buf;
ret = rt_i2c_transfer(bus, &msg, 1);
return (ret > 0) ? count : ret;
}
int rt_i2c_core_init(void)
{
return 0;
}
INIT_COMPONENT_EXPORT(rt_i2c_core_init);