173 lines
4.0 KiB
C
173 lines
4.0 KiB
C
/*
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* Copyright (c) 2006-2024, 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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* 2023-04-06 YangXi The first version
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*/
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#include <rtdevice.h>
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#include "fsl_lpi2c.h"
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#include "fsl_lpi2c_edma.h"
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#include "fsl_edma.h"
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#ifdef RT_USING_I2C
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enum
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{
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#ifdef BSP_USING_I2C0
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I2C0_INDEX,
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#endif
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#ifdef BSP_USING_I2C1
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I2C1_INDEX,
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#endif
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#ifdef BSP_USING_I2C2
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I2C2_INDEX,
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#endif
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};
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#define i2c_dbg rt_kprintf
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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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LPI2C_Type *I2C;
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clock_attach_id_t clock_attach_id;
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clock_div_name_t clock_div_name;
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clock_name_t clock_src;
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uint32_t baud;
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char *name;
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};
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struct lpc_i2c_bus lpc_obj[] =
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{
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#ifdef BSP_USING_I2C0
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{
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.I2C = LPI2C0,
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.baud = 100000U,
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.clock_attach_id = kFRO12M_to_FLEXCOMM0,
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.clock_div_name = kCLOCK_DivFlexcom0Clk,
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.clock_src = kCLOCK_Fro12M,
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.name = "i2c0",
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},
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#endif
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#ifdef BSP_USING_I2C1
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{
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.I2C = LPI2C1,
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.baud = 100000U,
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.clock_attach_id = kFRO12M_to_FLEXCOMM1,
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.clock_div_name = kCLOCK_DivFlexcom1Clk,
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.clock_src = kCLOCK_Fro12M,
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.name = "i2c1",
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},
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#endif
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#ifdef BSP_USING_I2C2
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{
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.I2C = LPI2C2,
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.baud = 100000U,
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.clock_attach_id = kFRO12M_to_FLEXCOMM2,
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.clock_div_name = kCLOCK_DivFlexcom2Clk,
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.clock_src = kCLOCK_Fro12M,
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.name = "i2c2",
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},
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#endif
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};
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static rt_ssize_t lpc_i2c_xfer(struct rt_i2c_bus_device *bus, 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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lpi2c_master_transfer_t xfer = {0};
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rt_uint32_t i;
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rt_ssize_t ret = 0;
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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 = kLPI2C_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 = kLPI2C_TransferRepeatedStartFlag;
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else
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xfer.flags = kLPI2C_TransferDefaultFlag;
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if (LPI2C_MasterTransferBlocking(lpc_i2c->I2C, &xfer) != kStatus_Success)
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{
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i2c_dbg("i2c bus read failed!\n");
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return i;
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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 = kLPI2C_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 = kLPI2C_TransferNoStopFlag;
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else
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xfer.flags = kLPI2C_TransferDefaultFlag;
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if (LPI2C_MasterTransferBlocking(lpc_i2c->I2C, &xfer) != kStatus_Success)
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{
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i2c_dbg("i2c bus write failed!\n");
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return i;
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}
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}
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}
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ret = i;
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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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int i;
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lpi2c_master_config_t masterConfig;
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for(i=0; i<ARRAY_SIZE(lpc_obj); i++)
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{
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CLOCK_SetClkDiv(lpc_obj[i].clock_div_name, 1u);
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CLOCK_AttachClk(lpc_obj[i].clock_attach_id);
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LPI2C_MasterGetDefaultConfig(&masterConfig);
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masterConfig.baudRate_Hz = lpc_obj[i].baud;
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LPI2C_MasterInit(lpc_obj[i].I2C, &masterConfig, CLOCK_GetFreq(lpc_obj[i].clock_src));
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lpc_obj[i].parent.ops = &i2c_ops;
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rt_i2c_bus_device_register(&lpc_obj[i].parent, lpc_obj[i].name);
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}
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return RT_EOK;
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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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