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/*
* Copyright (c) 2006-2022, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2022-02-22 airm2m first version
*/
#include <rtdevice.h>
#include <rtthread.h>
#include "board.h"
#ifdef BSP_USING_I2C
static struct rt_i2c_bus_device prv_air105_i2c;
static rt_ssize_t air105_i2c_mst_xfer(struct rt_i2c_bus_device *bus,
struct rt_i2c_msg msgs[],
rt_uint32_t num);
static rt_ssize_t air105_i2c_slv_xfer(struct rt_i2c_bus_device *bus,
struct rt_i2c_msg msgs[],
rt_uint32_t num);
static rt_err_t air105_i2c_bus_control(struct rt_i2c_bus_device *bus,
int cmd,
void *args);
static const struct rt_i2c_bus_device_ops air105_i2c_ops =
{
.master_xfer = air105_i2c_mst_xfer,
.slave_xfer = RT_NULL,
.i2c_bus_control = air105_i2c_bus_control
};
static rt_ssize_t air105_i2c_mst_xfer(struct rt_i2c_bus_device *bus,
struct rt_i2c_msg msgs[],
rt_uint32_t num)
{
rt_size_t i;
uint64_t tick;
struct rt_i2c_msg *msg = msgs;
RT_ASSERT(bus != RT_NULL);
rt_uint32_t i2c_id = (rt_uint32_t)bus->priv;
rt_int32_t Result;
while(!I2C_WaitResult(i2c_id, &Result)) {;}
for (i = 0; i < num; i++)
{
if (!(msg[i].flags & RT_I2C_NO_START))
{
if (msg[i].flags & RT_I2C_ADDR_10BIT)
{
I2C_Prepare(i2c_id, msg[i].addr, 2, NULL, NULL);
}
else
{
I2C_Prepare(i2c_id, msg[i].addr, 1, NULL, NULL);
}
}
if (msg[i].flags & RT_I2C_RD)
{
tick = GetSysTick();
I2C_MasterXfer(i2c_id, I2C_OP_READ, 0, msg[i].buf, msg[i].len, bus->timeout);
while(!I2C_WaitResult(i2c_id, &Result) && !SysTickCheckTimeout(tick, bus->timeout * CORE_TICK_1MS)){;}
if (!I2C_WaitResult(i2c_id, &Result))
{
I2C_ForceStop(i2c_id);
return -RT_EIO;
}
}
else
{
tick = GetSysTick();
I2C_MasterXfer(i2c_id, I2C_OP_WRITE, 0, msg[i].buf, msg[i].len, bus->timeout);
while(!I2C_WaitResult(i2c_id, &Result) && !SysTickCheckTimeout(tick, bus->timeout * CORE_TICK_1MS)){;}
if (!I2C_WaitResult(i2c_id, &Result))
{
I2C_ForceStop(i2c_id);
return -RT_EIO;
}
}
}
return i;
}
static rt_ssize_t air105_i2c_slv_xfer(struct rt_i2c_bus_device *bus,
struct rt_i2c_msg msgs[],
rt_uint32_t num)
{
return -RT_ENOSYS;
}
static rt_err_t air105_i2c_bus_control(struct rt_i2c_bus_device *bus,
int cmd,
void *args)
{
RT_ASSERT(bus != RT_NULL);
rt_uint32_t i2c_id = (rt_uint32_t)bus->priv;
switch (cmd)
{
case RT_I2C_DEV_CTRL_CLK:
I2C_MasterSetup(i2c_id, *(rt_uint32_t *)args);
break;
default:
return -RT_EIO;
}
return RT_EOK;
}
int air105_hw_i2c_init(void)
{
I2C_GlobalInit();
prv_air105_i2c.ops = &air105_i2c_ops;
prv_air105_i2c.priv = 0;
I2C_MasterSetup(0, 400000);
GPIO_Iomux(GPIOE_06, 2);
GPIO_Iomux(GPIOE_07, 2);
#ifdef I2C_BUS_NAME
rt_i2c_bus_device_register(&prv_air105_i2c, I2C_BUS_NAME);
#else
rt_i2c_bus_device_register(&prv_air105_i2c, "i2c");
#endif
return 0;
}
INIT_DEVICE_EXPORT(air105_hw_i2c_init);
#endif /* BSP_USING_I2C */
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