128 lines
3.7 KiB
C
128 lines
3.7 KiB
C
/*
|
|
* 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 */
|