rt-thread-official/bsp/lpc54114-lite/drivers/drv_i2c.c

131 lines
2.8 KiB
C

/*
* Copyright (c) 2006-2018, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*/
#include "drv_i2c.h"
#include "fsl_common.h"
#include "fsl_iocon.h"
#include "fsl_i2c.h"
struct lpc_i2c
{
struct rt_i2c_bus_device bus;
I2C_Type *base;
char *device_name;
};
static uint32_t get_i2c_freq(I2C_Type *base)
{
uint32_t freq = 0;
#if defined(BSP_USING_I2C4)
if(base == I2C4)
{
freq = CLOCK_GetFreq(kCLOCK_Flexcomm4);
}
#endif
return freq;
}
static rt_size_t master_xfer(struct rt_i2c_bus_device *bus, struct rt_i2c_msg msgs[], rt_uint32_t num)
{
rt_size_t ret = (0);
rt_uint32_t index = 0;
struct lpc_i2c *lpc_i2c = RT_NULL;
struct rt_i2c_msg *msg = RT_NULL;
i2c_master_transfer_t xfer = {0};
RT_ASSERT(bus != RT_NULL);
lpc_i2c = (struct lpc_i2c *)bus;
for(index = 0; index < num; index++)
{
msg = &msgs[index];
xfer.slaveAddress = msg->addr;
xfer.flags = kI2C_TransferDefaultFlag;
xfer.subaddress = 0;
xfer.subaddressSize = 0;
xfer.data = msg->buf;
xfer.dataSize = msg->len;
if (msg->flags & RT_I2C_RD)
{
xfer.direction = kI2C_Read;
}
else
{
xfer.direction = kI2C_Write;
}
if(I2C_MasterTransferBlocking(lpc_i2c->base, &xfer) != kStatus_Success)
{
rt_kprintf("i2c bus write failed, i2c bus stop!\n");
goto exit;
}
}
ret = index;
exit:
return ret;
}
static rt_size_t slave_xfer(struct rt_i2c_bus_device *bus, struct rt_i2c_msg msgs[], rt_uint32_t num)
{
return 0;
}
static rt_err_t i2c_bus_control(struct rt_i2c_bus_device *bus, rt_uint32_t cmd, rt_uint32_t arg)
{
return RT_EOK;
}
static const struct rt_i2c_bus_device_ops ops =
{
master_xfer,
slave_xfer,
i2c_bus_control,
};
#if defined(BSP_USING_I2C4)
static struct lpc_i2c i2c4 = {0};
#endif
int rt_hw_i2c_init(void)
{
CLOCK_EnableClock(kCLOCK_Iocon);
#if defined(BSP_USING_I2C4)
CLOCK_AttachClk(kFRO12M_to_FLEXCOMM4);
RESET_PeripheralReset(kFC4_RST_SHIFT_RSTn);
i2c4.base = I2C4;
i2c4.device_name = "i2c4";
i2c4.bus.ops = &ops;
IOCON_PinMuxSet(IOCON, 1, 1, IOCON_MODE_PULLUP | IOCON_FUNC5 | IOCON_DIGITAL_EN | IOCON_INPFILT_OFF);
IOCON_PinMuxSet(IOCON, 1, 2, IOCON_MODE_PULLUP | IOCON_FUNC5 | IOCON_DIGITAL_EN | IOCON_INPFILT_OFF);
i2c_master_config_t masterConfig;
I2C_MasterGetDefaultConfig(&masterConfig);
masterConfig.baudRate_Bps = 100*1000U;
I2C_MasterInit(I2C4, &masterConfig, get_i2c_freq(I2C4));
rt_i2c_bus_device_register(&i2c4.bus, i2c4.device_name);
#endif
return RT_EOK;
}
INIT_BOARD_EXPORT(rt_hw_i2c_init);