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rt-thread/bsp/imxrt/libraries/drivers/drv_i2c.c

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/*
* Copyright (c) 2006-2018, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2017-08-08 Yang the first version
* 2018-03-24 LaiYiKeTang add hardware iic
* 2019-04-22 tyustli add imxrt series support
*
*/
#include <rtthread.h>
#ifdef BSP_USING_I2C
#define LOG_TAG "drv.i2c"
#include <drv_log.h>
#if !defined(BSP_USING_I2C1) && !defined(BSP_USING_I2C2) && !defined(BSP_USING_I2C3) && !defined(BSP_USING_I2C4)
#error "Please define at least one BSP_USING_I2Cx"
#endif
#include <rtdevice.h>
#include "fsl_lpi2c.h"
#include "drv_i2c.h"
struct imxrt_i2c_bus
{
struct rt_i2c_bus_device parent;
LPI2C_Type *I2C;
struct rt_i2c_msg *msg;
rt_uint32_t msg_cnt;
volatile rt_uint32_t msg_ptr;
volatile rt_uint32_t dptr;
char *device_name;
};
#if defined (BSP_USING_I2C1)
#define I2C1BUS_NAME "i2c1"
#endif /*BSP_USING_I2C1*/
#if defined (BSP_USING_I2C2)
#define I2C2BUS_NAME "i2c2"
#endif /*BSP_USING_I2C2*/
#if !defined (MIMXRT1015_SERIES) /* imxrt1015 only have two i2c bus*/
#if defined (BSP_USING_I2C3)
#define I2C3BUS_NAME "i2c3"
#endif /*BSP_USING_I2C3*/
#if defined (BSP_USING_I2C4)
#define I2C4BUS_NAME "i2c4"
#endif /*BSP_USING_I2C4*/
#endif /* MIMXRT1015_SERIES */
#define LPI2C_CLOCK_SOURCE_DIVIDER 4
/* Get frequency of lpi2c clock */
#define LPI2C_CLOCK_FREQUENCY ((CLOCK_GetFreq(kCLOCK_Usb1PllClk) / 8) / (LPI2C_CLOCK_SOURCE_DIVIDER))
#ifdef BSP_USING_I2C1
static struct imxrt_i2c_bus lpi2c1 =
{
.I2C = LPI2C1,
.device_name = I2C1BUS_NAME,
};
#endif /* RT_USING_HW_I2C1 */
#ifdef BSP_USING_I2C2
static struct imxrt_i2c_bus lpi2c2 =
{
.I2C = LPI2C2,
.device_name = I2C2BUS_NAME,
};
#endif /* RT_USING_HW_I2C2 */
#if !defined (MIMXRT1015_SERIES) /* imxrt1015 only have two i2c bus*/
#ifdef BSP_USING_I2C3
static struct imxrt_i2c_bus lpi2c3 =
{
.I2C = LPI2C3,
.device_name = I2C3BUS_NAME,
};
#endif /* RT_USING_HW_I2C3 */
#ifdef BSP_USING_I2C4
static struct imxrt_i2c_bus lpi2c4 =
{
.I2C = LPI2C4,
.device_name = I2C4BUS_NAME,
};
#endif /* RT_USING_HW_I2C4 */
#endif /* MIMXRT1015_SERIES */
#if (defined(BSP_USING_I2C1) || defined(BSP_USING_I2C2) || defined(BSP_USING_I2C3) || defined(BSP_USING_I2C4))
static rt_size_t imxrt_i2c_mst_xfer(struct rt_i2c_bus_device *bus,
struct rt_i2c_msg msgs[],
rt_uint32_t num);
static rt_size_t imxrt_i2c_slv_xfer(struct rt_i2c_bus_device *bus,
struct rt_i2c_msg msgs[],
rt_uint32_t num);
static rt_err_t imxrt_i2c_bus_control(struct rt_i2c_bus_device *bus,
rt_uint32_t,
rt_uint32_t);
static const struct rt_i2c_bus_device_ops imxrt_i2c_ops =
{
.master_xfer = imxrt_i2c_mst_xfer,
.slave_xfer = imxrt_i2c_slv_xfer,
.i2c_bus_control = imxrt_i2c_bus_control,
};
static rt_err_t imxrt_lpi2c_configure(struct imxrt_i2c_bus *bus, lpi2c_master_config_t *cfg)
{
RT_ASSERT(bus != RT_NULL);
RT_ASSERT(cfg != RT_NULL);
bus->parent.ops = &imxrt_i2c_ops;
LPI2C_MasterInit(bus->I2C, cfg, LPI2C_CLOCK_FREQUENCY);
return RT_EOK;
}
status_t LPI2C_MasterCheck(LPI2C_Type *base, uint32_t status)
{
status_t result = kStatus_Success;
/* Check for error. These errors cause a stop to automatically be sent. We must */
/* clear the errors before a new transfer can start. */
status &= 0x3c00;
if (status)
{
/* Select the correct error code. Ordered by severity, with bus issues first. */
if (status & kLPI2C_MasterPinLowTimeoutFlag)
{
result = kStatus_LPI2C_PinLowTimeout;
}
else if (status & kLPI2C_MasterArbitrationLostFlag)
{
result = kStatus_LPI2C_ArbitrationLost;
}
else if (status & kLPI2C_MasterNackDetectFlag)
{
result = kStatus_LPI2C_Nak;
}
else if (status & kLPI2C_MasterFifoErrFlag)
{
result = kStatus_LPI2C_FifoError;
}
else
{
assert(false);
}
/* Clear the flags. */
LPI2C_MasterClearStatusFlags(base, status);
/* Reset fifos. These flags clear automatically. */
base->MCR |= LPI2C_MCR_RRF_MASK | LPI2C_MCR_RTF_MASK;
}
return result;
}
/*!
* @brief Wait until the tx fifo all empty.
* @param base The LPI2C peripheral base address.
* @retval #kStatus_Success
* @retval #kStatus_LPI2C_PinLowTimeout
* @retval #kStatus_LPI2C_ArbitrationLost
* @retval #kStatus_LPI2C_Nak
* @retval #kStatus_LPI2C_FifoError
*/
static status_t LPI2C_MasterWaitForTxFifoAllEmpty(LPI2C_Type *base)
{
uint32_t status;
size_t txCount;
do
{
status_t result;
/* Get the number of words in the tx fifo and compute empty slots. */
LPI2C_MasterGetFifoCounts(base, NULL, &txCount);
/* Check for error flags. */
status = LPI2C_MasterGetStatusFlags(base);
result = LPI2C_MasterCheck(base, status);
if (result)
{
return result;
}
}
while (txCount);
return kStatus_Success;
}
static rt_size_t imxrt_i2c_mst_xfer(struct rt_i2c_bus_device *bus,
struct rt_i2c_msg msgs[],
rt_uint32_t num)
{
struct imxrt_i2c_bus *imxrt_i2c;
rt_size_t i;
RT_ASSERT(bus != RT_NULL);
imxrt_i2c = (struct imxrt_i2c_bus *) bus;
imxrt_i2c->msg = msgs;
imxrt_i2c->msg_ptr = 0;
imxrt_i2c->msg_cnt = num;
imxrt_i2c->dptr = 0;
for (i = 0; i < num; i++)
{
if (imxrt_i2c->msg[i].flags & RT_I2C_RD)
{
if (LPI2C_MasterStart(imxrt_i2c->I2C, imxrt_i2c->msg[i].addr, kLPI2C_Write) != kStatus_Success)
{
i = 0;
break;
}
while (LPI2C_MasterGetStatusFlags(imxrt_i2c->I2C) & kLPI2C_MasterNackDetectFlag)
{
}
if (LPI2C_MasterRepeatedStart(imxrt_i2c->I2C, imxrt_i2c->msg[i].addr, kLPI2C_Read) != kStatus_Success)
{
i = 0;
break;
}
if (LPI2C_MasterReceive(imxrt_i2c->I2C, imxrt_i2c->msg[i].buf, imxrt_i2c->msg[i].len) != kStatus_Success)
{
i = 0;
break;
}
}
else
{
if (LPI2C_MasterStart(imxrt_i2c->I2C, imxrt_i2c->msg[i].addr, kLPI2C_Write) != kStatus_Success)
{
i = 0;
break;
}
while (LPI2C_MasterGetStatusFlags(imxrt_i2c->I2C) & kLPI2C_MasterNackDetectFlag)
{
}
if (LPI2C_MasterSend(imxrt_i2c->I2C, imxrt_i2c->msg[i].buf, imxrt_i2c->msg[i].len) != kStatus_Success)
{
i = 0;
break;
}
if (LPI2C_MasterWaitForTxFifoAllEmpty(imxrt_i2c->I2C) != kStatus_Success)
{
i = 0;
break;
}
}
}
if (LPI2C_MasterStop(imxrt_i2c->I2C) != kStatus_Success)
{
i = 0;
}
imxrt_i2c->msg = RT_NULL;
imxrt_i2c->msg_ptr = 0;
imxrt_i2c->msg_cnt = 0;
imxrt_i2c->dptr = 0;
return i;
}
static rt_size_t imxrt_i2c_slv_xfer(struct rt_i2c_bus_device *bus,
struct rt_i2c_msg msgs[],
rt_uint32_t num)
{
return 0;
}
static rt_err_t imxrt_i2c_bus_control(struct rt_i2c_bus_device *bus,
rt_uint32_t cmd,
rt_uint32_t arg)
{
return RT_ERROR;
}
#endif
int rt_hw_i2c_init(void)
{
lpi2c_master_config_t masterConfig = {0};
#if defined(BSP_USING_I2C1)
LPI2C_MasterGetDefaultConfig(&masterConfig);
#if defined(HW_I2C1_BADURATE_400kHZ)
masterConfig.baudRate_Hz = 400000U;
#elif defined(HW_I2C1_BADURATE_100kHZ)
masterConfig.baudRate_Hz = 100000U;
#endif /*HW_I2C1_BADURATE_400kHZ*/
imxrt_lpi2c_configure(&lpi2c1, &masterConfig);
rt_i2c_bus_device_register(&lpi2c1.parent, lpi2c1.device_name);
#endif /* BSP_USING_I2C1 */
#if defined(BSP_USING_I2C2)
LPI2C_MasterGetDefaultConfig(&masterConfig);
#if defined(HW_I2C2_BADURATE_400kHZ)
masterConfig.baudRate_Hz = 400000U;
#elif defined(HW_I2C2_BADURATE_100kHZ)
masterConfig.baudRate_Hz = 100000U;
#endif /* HW_I2C2_BADURATE_400kHZ */
imxrt_lpi2c_configure(&lpi2c2, &masterConfig);
rt_i2c_bus_device_register(&lpi2c2.parent, lpi2c2.device_name);
#endif /* BSP_USING_I2C2 */
#if !defined(MIMXRT1015_SERIES) /* imxrt1015 only have two i2c bus*/
#if defined(BSP_USING_I2C3)
LPI2C_MasterGetDefaultConfig(&masterConfig);
#if defined(HW_I2C3_BADURATE_400kHZ)
masterConfig.baudRate_Hz = 400000U;
#elif defined(HW_I2C3_BADURATE_100kHZ)
masterConfig.baudRate_Hz = 100000U;
#endif /* HW_I2C3_BADURATE_400kHZ */
imxrt_lpi2c_configure(&lpi2c3, &masterConfig);
rt_i2c_bus_device_register(&lpi2c3.parent, lpi2c3.device_name);
#endif /* BSP_USING_I2C3 */
#if defined(BSP_USING_I2C4)
LPI2C_MasterGetDefaultConfig(&masterConfig);
#if defined(HW_I2C4_BADURATE_400kHZ)
masterConfig.baudRate_Hz = 400000U;
#elif defined(HW_I2C4_BADURATE_100kHZ)
masterConfig.baudRate_Hz = 100000U;
#endif /* HW_I2C4_BADURATE_400kHZ */
imxrt_lpi2c_configure(&lpi2c4, &masterConfig);
rt_i2c_bus_device_register(&lpi2c4.parent, lpi2c4.device_name);
#endif /* BSP_USING_I2C4 */
#endif /* MIMXRT1015_SERIES */
return 0;
}
INIT_DEVICE_EXPORT(rt_hw_i2c_init);
#endif /* BSP_USING_I2C */
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