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/*
* Copyright (c) 2006-2024 RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2024-09-03 Yilin Sun Initial version
*/
#include <rtdevice.h>
#include "fsl_i2c.h"
#ifdef RT_USING_I2C
#define BSP_DEFAULT_I2C_FREQ (100000)
typedef struct
{
struct rt_i2c_bus_device parent;
I2C_Type *instance;
uint32_t input_frequency;
} mcx_i2c_obj_t;
typedef struct
{
I2C_Type *instance;
uint8_t id;
} mcx_i2c_instance_t;
static const mcx_i2c_instance_t mcx_i2c_instances[] =
{
#ifdef BSP_USING_I2C0
{I2C0, 0},
#endif
#ifdef BSP_USING_I2C1
{I2C1, 1},
#endif
};
static mcx_i2c_obj_t mcx_i2c_list[ARRAY_SIZE(mcx_i2c_instances)];
static int mcx_i2c_master_xfer(struct rt_i2c_bus_device *bus, struct rt_i2c_msg msgs[], rt_uint32_t num)
{
struct rt_i2c_msg *msg;
i2c_master_transfer_t xfer = {0};
rt_uint32_t i;
rt_ssize_t ret = 0;
mcx_i2c_obj_t *i2c = (mcx_i2c_obj_t *)bus;
for (i = 0; i < num; i++)
{
msg = &msgs[i];
if (msg->flags & RT_I2C_RD)
{
xfer.slaveAddress = msg->addr;
xfer.direction = kI2C_Read;
xfer.subaddress = 0;
xfer.subaddressSize = 0;
xfer.data = msg->buf;
xfer.dataSize = msg->len;
xfer.flags = kI2C_TransferDefaultFlag;
if (i != 0)
{
xfer.flags |= kI2C_TransferRepeatedStartFlag;
}
if (i != num - 1)
{
xfer.flags |= kI2C_TransferNoStopFlag;
}
if (I2C_MasterTransferBlocking(i2c->instance, &xfer) != kStatus_Success)
{
return i;
}
}
else
{
xfer.slaveAddress = msg->addr;
xfer.direction = kI2C_Write;
xfer.subaddress = 0;
xfer.subaddressSize = 0;
xfer.data = msg->buf;
xfer.dataSize = msg->len;
xfer.flags = kI2C_TransferDefaultFlag;
if (i != 0)
{
xfer.flags |= kI2C_TransferRepeatedStartFlag;
}
if (i != num - 1)
{
xfer.flags |= kI2C_TransferNoStopFlag;
}
if (I2C_MasterTransferBlocking(i2c->instance, &xfer) != kStatus_Success)
{
return i;
}
}
}
ret = num;
return ret;
}
static const struct rt_i2c_bus_device_ops mcx_i2c_ops =
{
mcx_i2c_master_xfer,
RT_NULL,
RT_NULL,
};
static int rt_hw_i2c_init(void)
{
i2c_master_config_t master_cfg;
char name_buf[16];
for (size_t i = 0; i < ARRAY_SIZE(mcx_i2c_instances); i++)
{
mcx_i2c_list[i].input_frequency = CLOCK_GetCoreSysClkFreq();
mcx_i2c_list[i].instance = mcx_i2c_instances[i].instance;
mcx_i2c_list[i].parent.ops = &mcx_i2c_ops;
I2C_MasterGetDefaultConfig(&master_cfg);
master_cfg.baudRate_Bps = BSP_DEFAULT_I2C_FREQ;
I2C_MasterInit(mcx_i2c_list[i].instance, &master_cfg, mcx_i2c_list[i].input_frequency);
rt_snprintf(name_buf, 16, "i2c%d", mcx_i2c_instances[i].id);
rt_i2c_bus_device_register(&mcx_i2c_list[i].parent, name_buf);
}
return RT_EOK;
}
INIT_DEVICE_EXPORT(rt_hw_i2c_init);
#endif
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