134 lines
3.0 KiB
C
134 lines
3.0 KiB
C
/*
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* Copyright (c) 2006-2018, 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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#include "drv_i2c.h"
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#include "fsl_common.h"
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#include "fsl_iocon.h"
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#include "fsl_i2c.h"
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struct lpc_i2c
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{
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struct rt_i2c_bus_device bus;
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I2C_Type *base;
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char *device_name;
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};
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static uint32_t get_i2c_freq(I2C_Type *base)
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{
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uint32_t freq = 0;
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#if defined(BSP_USING_I2C4)
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if(base == I2C4)
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{
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freq = CLOCK_GetFreq(kCLOCK_Flexcomm4);
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}
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#endif
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return freq;
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}
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static rt_size_t master_xfer(struct rt_i2c_bus_device *bus, struct rt_i2c_msg msgs[], rt_uint32_t num)
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{
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rt_size_t ret = (0);
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rt_uint32_t index = 0;
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struct lpc_i2c *lpc_i2c = RT_NULL;
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struct rt_i2c_msg *msg = RT_NULL;
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i2c_direction_t direction;
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status_t result = kStatus_Success;
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RT_ASSERT(bus != RT_NULL);
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lpc_i2c = (struct lpc_i2c *)bus;
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for(index = 0; index < num; index++)
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{
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msg = &msgs[index];
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direction = ((msg->flags & RT_I2C_RD) ? kI2C_Read : kI2C_Write);
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if (!(msg->flags & RT_I2C_NO_START))
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{
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/* Start condition and slave address. */
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result = I2C_MasterStart(lpc_i2c->base, msg->addr, direction);
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}
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if (result == kStatus_Success)
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{
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if (direction == kI2C_Write)
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{
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/* Transmit data. */
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result = I2C_MasterWriteBlocking(lpc_i2c->base, msg->buf, msg->len, kI2C_TransferDefaultFlag);
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}
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else
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{
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/* Receive Data. */
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result = I2C_MasterReadBlocking(lpc_i2c->base, msg->buf, msg->len, kI2C_TransferDefaultFlag);
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}
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}
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}
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if (result == kStatus_Success)
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{
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ret = index;
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}
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I2C_MasterStop(lpc_i2c->base);
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return ret;
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}
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static rt_size_t slave_xfer(struct rt_i2c_bus_device *bus, struct rt_i2c_msg msgs[], rt_uint32_t num)
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{
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return 0;
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}
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static rt_err_t i2c_bus_control(struct rt_i2c_bus_device *bus, rt_uint32_t cmd, rt_uint32_t arg)
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{
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return RT_EOK;
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}
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static const struct rt_i2c_bus_device_ops ops =
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{
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master_xfer,
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slave_xfer,
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i2c_bus_control,
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};
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#if defined(BSP_USING_I2C4)
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static struct lpc_i2c i2c4 = {0};
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#endif
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int rt_hw_i2c_init(void)
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{
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CLOCK_EnableClock(kCLOCK_Iocon);
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#if defined(BSP_USING_I2C4)
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CLOCK_AttachClk(kFRO12M_to_FLEXCOMM4);
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RESET_PeripheralReset(kFC4_RST_SHIFT_RSTn);
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i2c4.base = I2C4;
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i2c4.device_name = "i2c4";
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i2c4.bus.ops = &ops;
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IOCON_PinMuxSet(IOCON, 1, 1, IOCON_MODE_PULLUP | IOCON_FUNC5 | IOCON_DIGITAL_EN | IOCON_INPFILT_OFF);
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IOCON_PinMuxSet(IOCON, 1, 2, IOCON_MODE_PULLUP | IOCON_FUNC5 | IOCON_DIGITAL_EN | IOCON_INPFILT_OFF);
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i2c_master_config_t masterConfig;
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I2C_MasterGetDefaultConfig(&masterConfig);
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masterConfig.baudRate_Bps = 100*1000U;
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I2C_MasterInit(I2C4, &masterConfig, get_i2c_freq(I2C4));
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rt_i2c_bus_device_register(&i2c4.bus, i2c4.device_name);
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#endif
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return RT_EOK;
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}
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INIT_BOARD_EXPORT(rt_hw_i2c_init);
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