145 lines
3.7 KiB
C
145 lines
3.7 KiB
C
/*
|
|
* Copyright (c) 2006-2018, 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 */
|