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/*
* Copyright (c) 2006-2021, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2019-07-15 Magicoe The first version for LPC55S6x
*/
#include <rtthread.h>
#include <rtdevice.h>
#include "board.h"
#include "fsl_iocon.h"
#include "fsl_gpio.h"
#include "fsl_i2c.h"
#ifdef RT_USING_I2C
struct lpc_i2c_bus
{
struct rt_i2c_bus_device parent;
I2C_Type *I2C;
char *device_name;
};
static rt_size_t lpc_i2c_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_err_t ret = RT_ERROR;
struct lpc_i2c_bus *lpc_i2c = (struct lpc_i2c_bus *)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;
if(i != 0)
xfer.flags = kI2C_TransferRepeatedStartFlag;
else
xfer.flags = kI2C_TransferDefaultFlag;
if (I2C_MasterTransferBlocking(lpc_i2c->I2C, &xfer) != kStatus_Success)
{
i2c_dbg("i2c bus write failed,i2c bus stop!\n");
goto out;
}
}
else
{
xfer.slaveAddress = msg->addr;
xfer.direction = kI2C_Write;
xfer.subaddress = 0;
xfer.subaddressSize = 0;
xfer.data = msg->buf;
xfer.dataSize = msg->len;
if(i == 0)
xfer.flags = kI2C_TransferNoStopFlag;
else
xfer.flags = kI2C_TransferDefaultFlag;
if (I2C_MasterTransferBlocking(lpc_i2c->I2C, &xfer) != kStatus_Success)
{
i2c_dbg("i2c bus write failed,i2c bus stop!\n");
goto out;
}
}
}
ret = i;
out:
i2c_dbg("send stop condition\n");
return ret;
}
static const struct rt_i2c_bus_device_ops i2c_ops =
{
lpc_i2c_xfer,
RT_NULL,
RT_NULL
};
int rt_hw_i2c_init(void)
{
i2c_master_config_t masterConfig;
#ifdef BSP_USING_I2C1
static struct lpc_i2c_bus lpc_i2c1;
/* attach 12 MHz clock to FLEXCOMM2 (I2C master for touch controller) */
CLOCK_AttachClk(kFRO12M_to_FLEXCOMM1);
I2C_MasterGetDefaultConfig(&masterConfig);
/* Change the default baudrate configuration */
masterConfig.baudRate_Bps = 100000U;
/* Initialize the I2C master peripheral */
I2C_MasterInit(I2C1, &masterConfig, 12000000);
rt_memset((void *)&lpc_i2c1, 0, sizeof(struct lpc_i2c_bus));
lpc_i2c1.parent.ops = &i2c_ops;
lpc_i2c1.I2C = I2C1;
lpc_i2c1.device_name = "LPC Flexcomm1 as I2C";
rt_i2c_bus_device_register(&lpc_i2c1.parent, "i2c1");
#endif /* BSP_USING_I2C1 */
#ifdef BSP_USING_I2C4
static struct lpc_i2c_bus lpc_i2c4;
/* attach 12 MHz clock to FLEXCOMM2 (I2C master for touch controller) */
CLOCK_AttachClk(kFRO12M_to_FLEXCOMM4);
I2C_MasterGetDefaultConfig(&masterConfig);
/* Change the default baudrate configuration */
masterConfig.baudRate_Bps = 100000U;
/* Initialize the I2C master peripheral */
I2C_MasterInit(I2C4, &masterConfig, 12000000);
rt_memset((void *)&lpc_i2c4, 0, sizeof(struct lpc_i2c_bus));
lpc_i2c4.parent.ops = &i2c_ops;
lpc_i2c4.I2C = I2C4;
lpc_i2c4.device_name = "LPC Flexcomm4 as I2C";
rt_i2c_bus_device_register(&lpc_i2c4.parent, BSP_USING_MMA8562I2C);
#endif /* BSP_USING_I2C4 */
return 0;
}
INIT_DEVICE_EXPORT(rt_hw_i2c_init);
#endif /* RT_USING_I2C */
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