145 lines
3.7 KiB
C
145 lines
3.7 KiB
C
/*
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* Copyright (c) 2006-2022, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2019-07-15 Magicoe The first version for LPC55S6x
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*/
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#include <rtthread.h>
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#include <rtdevice.h>
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#include "board.h"
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#include "fsl_iocon.h"
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#include "fsl_gpio.h"
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#include "fsl_i2c.h"
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#ifdef RT_USING_I2C
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struct lpc_i2c_bus
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{
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struct rt_i2c_bus_device parent;
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I2C_Type *I2C;
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char *device_name;
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};
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static rt_size_t lpc_i2c_xfer(struct rt_i2c_bus_device *bus,
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struct rt_i2c_msg msgs[], rt_uint32_t num)
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{
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struct rt_i2c_msg *msg;
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i2c_master_transfer_t xfer = {0};
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rt_uint32_t i;
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rt_err_t ret = RT_ERROR;
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struct lpc_i2c_bus *lpc_i2c = (struct lpc_i2c_bus *)bus;
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for (i = 0; i < num; i++)
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{
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msg = &msgs[i];
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if (msg->flags & RT_I2C_RD)
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{
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xfer.slaveAddress = msg->addr;
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xfer.direction = kI2C_Read;
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xfer.subaddress = 0;
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xfer.subaddressSize = 0;
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xfer.data = msg->buf;
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xfer.dataSize = msg->len;
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if(i != 0)
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xfer.flags = kI2C_TransferRepeatedStartFlag;
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else
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xfer.flags = kI2C_TransferDefaultFlag;
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if (I2C_MasterTransferBlocking(lpc_i2c->I2C, &xfer) != kStatus_Success)
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{
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i2c_dbg("i2c bus write failed,i2c bus stop!\n");
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goto out;
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}
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}
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else
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{
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xfer.slaveAddress = msg->addr;
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xfer.direction = kI2C_Write;
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xfer.subaddress = 0;
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xfer.subaddressSize = 0;
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xfer.data = msg->buf;
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xfer.dataSize = msg->len;
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if(i == 0)
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xfer.flags = kI2C_TransferNoStopFlag;
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else
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xfer.flags = kI2C_TransferDefaultFlag;
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if (I2C_MasterTransferBlocking(lpc_i2c->I2C, &xfer) != kStatus_Success)
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{
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i2c_dbg("i2c bus write failed,i2c bus stop!\n");
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goto out;
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}
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}
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}
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ret = i;
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out:
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i2c_dbg("send stop condition\n");
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return ret;
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}
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static const struct rt_i2c_bus_device_ops i2c_ops =
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{
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lpc_i2c_xfer,
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RT_NULL,
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RT_NULL
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};
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int rt_hw_i2c_init(void)
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{
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i2c_master_config_t masterConfig;
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#ifdef BSP_USING_I2C1
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static struct lpc_i2c_bus lpc_i2c1;
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/* attach 12 MHz clock to FLEXCOMM2 (I2C master for touch controller) */
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CLOCK_AttachClk(kFRO12M_to_FLEXCOMM1);
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I2C_MasterGetDefaultConfig(&masterConfig);
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/* Change the default baudrate configuration */
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masterConfig.baudRate_Bps = 100000U;
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/* Initialize the I2C master peripheral */
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I2C_MasterInit(I2C1, &masterConfig, 12000000);
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rt_memset((void *)&lpc_i2c1, 0, sizeof(struct lpc_i2c_bus));
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lpc_i2c1.parent.ops = &i2c_ops;
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lpc_i2c1.I2C = I2C1;
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lpc_i2c1.device_name = "LPC Flexcomm1 as I2C";
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rt_i2c_bus_device_register(&lpc_i2c1.parent, "i2c1");
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#endif /* BSP_USING_I2C1 */
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#ifdef BSP_USING_I2C4
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static struct lpc_i2c_bus lpc_i2c4;
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/* attach 12 MHz clock to FLEXCOMM2 (I2C master for touch controller) */
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CLOCK_AttachClk(kFRO12M_to_FLEXCOMM4);
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I2C_MasterGetDefaultConfig(&masterConfig);
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/* Change the default baudrate configuration */
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masterConfig.baudRate_Bps = 100000U;
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/* Initialize the I2C master peripheral */
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I2C_MasterInit(I2C4, &masterConfig, 12000000);
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rt_memset((void *)&lpc_i2c4, 0, sizeof(struct lpc_i2c_bus));
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lpc_i2c4.parent.ops = &i2c_ops;
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lpc_i2c4.I2C = I2C4;
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lpc_i2c4.device_name = "LPC Flexcomm4 as I2C";
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rt_i2c_bus_device_register(&lpc_i2c4.parent, BSP_USING_MMA8562I2C);
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#endif /* BSP_USING_I2C4 */
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return 0;
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}
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INIT_DEVICE_EXPORT(rt_hw_i2c_init);
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#endif /* RT_USING_I2C */
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