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/**************************************************************************//**
*
* @copyright (C) 2020 Nuvoton Technology Corp. All rights reserved.
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2020-2-05 HPHuang First version
******************************************************************************/
#include <rtconfig.h>
#ifdef BSP_USING_I2C
#include <rtdevice.h>
#include "NuMicro.h"
/* Private define ---------------------------------------------------------------*/
#define LOG_TAG "drv.i2c"
#define DBG_ENABLE
#define DBG_SECTION_NAME "drv.i2c"
#define DBG_LEVEL DBG_ERROR
#define DBG_COLOR
#include <rtdbg.h>
const rt_uint32_t u32I2C_MASTER_STATUS_START = 0x08UL;
const rt_uint32_t u32I2C_MASTER_STATUS_REPEAT_START = 0x10UL;
const rt_uint32_t u32I2C_MASTER_STATUS_TRANSMIT_ADDRESS_ACK = 0x18UL;
const rt_uint32_t u32I2C_MASTER_STATUS_TRANSMIT_ADDRESS_NACK = 0x20UL;
const rt_uint32_t u32I2C_MASTER_STATUS_TRANSMIT_DATA_ACK = 0x28UL;
const rt_uint32_t u32I2C_MASTER_STATUS_TRANSMIT_DATA_NACK = 0x30UL;
const rt_uint32_t u32I2C_MASTER_STATUS_ARBITRATION_LOST = 0x38UL;
const rt_uint32_t u32I2C_MASTER_STATUS_RECEIVE_ADDRESS_ACK = 0x40UL;
const rt_uint32_t u32I2C_MASTER_STATUS_RECEIVE_ADDRESS_NACK = 0x48UL;
const rt_uint32_t u32I2C_MASTER_STATUS_RECEIVE_DATA_ACK = 0x50UL;
const rt_uint32_t u32I2C_MASTER_STATUS_RECEIVE_DATA_NACK = 0x58UL;
const rt_uint32_t u32I2C_MASTER_STATUS_BUS_ERROR = 0x00UL;
const rt_uint32_t u32I2C_MASTER_STATUS_BUS_RELEASED = 0xF8UL;
/* Private typedef --------------------------------------------------------------*/
typedef struct _nu_i2c_bus
{
struct rt_i2c_bus_device parent;
I2C_T *I2C;
struct rt_i2c_msg *msg;
char *device_name;
} nu_i2c_bus_t;
/* Private variables ------------------------------------------------------------*/
#ifdef BSP_USING_I2C0
#define I2C0BUS_NAME "i2c0"
static nu_i2c_bus_t nu_i2c0 =
{
.I2C = I2C0,
.device_name = I2C0BUS_NAME,
};
#endif /* BSP_USING_I2C0 */
#ifdef BSP_USING_I2C1
#define I2C1BUS_NAME "i2c1"
static nu_i2c_bus_t nu_i2c1 =
{
.I2C = I2C1,
.device_name = I2C1BUS_NAME,
};
#endif /* BSP_USING_I2C1 */
#ifdef BSP_USING_I2C2
#define I2C2BUS_NAME "i2c2"
static nu_i2c_bus_t nu_i2c2 =
{
.I2C = I2C2,
.device_name = I2C2BUS_NAME,
};
#endif /* BSP_USING_I2C2 */
/* Private functions ------------------------------------------------------------*/
#if (defined(BSP_USING_I2C0) || defined(BSP_USING_I2C1) || defined(BSP_USING_I2C2))
static rt_ssize_t nu_i2c_mst_xfer(struct rt_i2c_bus_device *bus,
struct rt_i2c_msg msgs[],
rt_uint32_t num);
static rt_err_t nu_i2c_bus_control(struct rt_i2c_bus_device *bus,
int cmd,
void *args);
static const struct rt_i2c_bus_device_ops nu_i2c_ops =
{
.master_xfer = nu_i2c_mst_xfer,
.slave_xfer = NULL,
.i2c_bus_control = nu_i2c_bus_control
};
static rt_err_t nu_i2c_bus_control(struct rt_i2c_bus_device *bus, int cmd, void *args)
{
nu_i2c_bus_t *nu_i2c;
RT_ASSERT(bus != RT_NULL);
nu_i2c = (nu_i2c_bus_t *) bus;
switch (cmd)
{
case RT_I2C_DEV_CTRL_CLK:
I2C_SetBusClockFreq(nu_i2c->I2C, *(rt_uint32_t *)args);
break;
default:
return -RT_EIO;
}
return RT_EOK;
}
static inline rt_err_t nu_i2c_wait_ready_with_timeout(nu_i2c_bus_t *bus)
{
rt_tick_t start = rt_tick_get();
while (!(bus->I2C->CTL0 & I2C_CTL0_SI_Msk))
{
if ((rt_tick_get() - start) > bus->parent.timeout)
{
LOG_E("\ni2c: timeout!\n");
return -RT_ETIMEOUT;
}
}
return RT_EOK;
}
static inline rt_err_t nu_i2c_send_data(nu_i2c_bus_t *nu_i2c, rt_uint8_t data)
{
I2C_SET_DATA(nu_i2c->I2C, data);
I2C_SET_CONTROL_REG(nu_i2c->I2C, I2C_CTL_SI);
return nu_i2c_wait_ready_with_timeout(nu_i2c);
}
static rt_err_t nu_i2c_send_address(nu_i2c_bus_t *nu_i2c,
struct rt_i2c_msg *msg)
{
rt_uint16_t flags = msg->flags;
rt_uint16_t ignore_nack = msg->flags & RT_I2C_IGNORE_NACK;
rt_uint8_t addr1, addr2;
rt_err_t ret;
if (flags & RT_I2C_ADDR_10BIT)
{
nu_i2c->I2C->CTL1 |= I2C_CTL1_ADDR10EN_Msk;
addr1 = 0xf0 | ((msg->addr >> 7) & 0x06);
addr2 = msg->addr & 0xff;
LOG_D("address1: %d, address2: %d\n", addr1, addr2);
ret = nu_i2c_send_data(nu_i2c, addr1);
if (ret != RT_EOK) /* for timeout condition */
return -RT_EIO;
if ((I2C_GET_STATUS(nu_i2c->I2C) != u32I2C_MASTER_STATUS_TRANSMIT_ADDRESS_ACK) && !ignore_nack)
{
LOG_E("NACK: sending first address failed\n");
return -RT_EIO;
}
ret = nu_i2c_send_data(nu_i2c, addr2);
if (ret != RT_EOK) /* for timeout condition */
return -RT_EIO;
if ((I2C_GET_STATUS(nu_i2c->I2C) != u32I2C_MASTER_STATUS_TRANSMIT_ADDRESS_ACK) && !ignore_nack)
{
LOG_E("NACK: sending second address failed\n");
return -RT_EIO;
}
if (flags & RT_I2C_RD)
{
LOG_D("send repeated START signal\n");
I2C_SET_CONTROL_REG(nu_i2c->I2C, I2C_CTL_STA_SI);
ret = nu_i2c_wait_ready_with_timeout(nu_i2c);
if (ret != RT_EOK) /* for timeout condition */
return -RT_EIO;
if ((I2C_GET_STATUS(nu_i2c->I2C) != u32I2C_MASTER_STATUS_REPEAT_START) && !ignore_nack)
{
LOG_E("sending repeated START failed\n");
return -RT_EIO;
}
addr1 |= 0x01;
ret = nu_i2c_send_data(nu_i2c, addr1);
if (ret != RT_EOK) /* for timeout condition */
return -RT_EIO;
if ((I2C_GET_STATUS(nu_i2c->I2C) != u32I2C_MASTER_STATUS_RECEIVE_ADDRESS_ACK) && !ignore_nack)
{
LOG_E("NACK: sending read address failed\n");
return -RT_EIO;
}
}
}
else
{
/* 7-bit addr */
addr1 = msg->addr << 1;
if (flags & RT_I2C_RD)
addr1 |= 1;
/* Send device address */
ret = nu_i2c_send_data(nu_i2c, addr1); /* Send Address */
if (ret != RT_EOK) /* for timeout condition */
return -RT_EIO;
if ((I2C_GET_STATUS(nu_i2c->I2C)
!= ((flags & RT_I2C_RD) ? u32I2C_MASTER_STATUS_RECEIVE_ADDRESS_ACK : u32I2C_MASTER_STATUS_TRANSMIT_ADDRESS_ACK))
&& !ignore_nack)
{
LOG_E("sending address failed\n");
return -RT_EIO;
}
}
return RT_EOK;
}
static rt_ssize_t nu_i2c_mst_xfer(struct rt_i2c_bus_device *bus,
struct rt_i2c_msg msgs[],
rt_uint32_t num)
{
struct rt_i2c_msg *msg;
nu_i2c_bus_t *nu_i2c;
rt_size_t i;
rt_uint32_t cnt_data;
rt_uint16_t ignore_nack;
rt_err_t ret;
RT_ASSERT(bus != RT_NULL);
nu_i2c = (nu_i2c_bus_t *) bus;
nu_i2c->msg = msgs;
nu_i2c->I2C->CTL0 |= I2C_CTL0_STA_Msk | I2C_CTL0_SI_Msk;
ret = nu_i2c_wait_ready_with_timeout(nu_i2c);
if (ret != RT_EOK) /* for timeout condition */
{
rt_set_errno(-RT_ETIMEOUT);
return 0;
}
if (I2C_GET_STATUS(nu_i2c->I2C) != u32I2C_MASTER_STATUS_START)
{
i = 0;
LOG_E("Send START Failed");
return i;
}
for (i = 0; i < num; i++)
{
msg = &msgs[i];
ignore_nack = msg->flags & RT_I2C_IGNORE_NACK;
if (!(msg->flags & RT_I2C_NO_START))
{
if (i)
{
I2C_SET_CONTROL_REG(nu_i2c->I2C, I2C_CTL_STA_SI);
ret = nu_i2c_wait_ready_with_timeout(nu_i2c);
if (ret != RT_EOK) /* for timeout conditrion */
break;
if (I2C_GET_STATUS(nu_i2c->I2C) != u32I2C_MASTER_STATUS_REPEAT_START)
{
i = 0;
LOG_E("Send repeat START Fail");
break;
}
}
if ((RT_EOK != nu_i2c_send_address(nu_i2c, msg))
&& !ignore_nack)
{
i = 0;
LOG_E("Send Address Fail");
break;
}
}
if (nu_i2c->msg[i].flags & RT_I2C_RD) /* Receive Bytes */
{
rt_uint32_t do_rd_nack = (i == (num - 1));
for (cnt_data = 0 ; cnt_data < (nu_i2c->msg[i].len) ; cnt_data++)
{
do_rd_nack += (cnt_data == (nu_i2c->msg[i].len - 1)); /* NACK after last byte for hardware setting */
if (do_rd_nack == 2)
{
I2C_SET_CONTROL_REG(nu_i2c->I2C, I2C_CTL_SI);
}
else
{
I2C_SET_CONTROL_REG(nu_i2c->I2C, I2C_CTL_SI_AA);
}
ret = nu_i2c_wait_ready_with_timeout(nu_i2c);
if (ret != RT_EOK) /* for timeout condition */
break;
if (nu_i2c->I2C->CTL0 & I2C_CTL_AA)
{
if (I2C_GET_STATUS(nu_i2c->I2C) != u32I2C_MASTER_STATUS_RECEIVE_DATA_ACK)
{
i = 0;
break;
}
}
else
{
if (I2C_GET_STATUS(nu_i2c->I2C) != u32I2C_MASTER_STATUS_RECEIVE_DATA_NACK)
{
i = 0;
break;
}
}
nu_i2c->msg[i].buf[cnt_data] = nu_i2c->I2C->DAT;
}
}
else /* Send Bytes */
{
for (cnt_data = 0 ; cnt_data < (nu_i2c->msg[i].len) ; cnt_data++)
{
/* Send register number and MSB of data */
ret = nu_i2c_send_data(nu_i2c, (uint8_t)(nu_i2c->msg[i].buf[cnt_data]));
if (ret != RT_EOK) /* for timeout condition */
break;
if (I2C_GET_STATUS(nu_i2c->I2C) != u32I2C_MASTER_STATUS_TRANSMIT_DATA_ACK
&& !ignore_nack
) /* Send aata and get Ack */
{
i = 0;
break;
}
}
}
}
I2C_STOP(nu_i2c->I2C);
RT_ASSERT(I2C_GET_STATUS(nu_i2c->I2C) == u32I2C_MASTER_STATUS_BUS_RELEASED);
if (I2C_GET_STATUS(nu_i2c->I2C) != u32I2C_MASTER_STATUS_BUS_RELEASED)
{
i = 0;
}
nu_i2c->msg = RT_NULL;
nu_i2c->I2C->CTL1 = 0; /*clear all sub modes like 10 bit mode*/
return i;
}
#endif
/* Public functions -------------------------------------------------------------*/
int rt_hw_i2c_init(void)
{
rt_err_t ret = -RT_ERROR;
SYS_UnlockReg();
#if defined(BSP_USING_I2C0)
I2C_Close(nu_i2c0.I2C);
I2C_Open(nu_i2c0.I2C, 100000);
nu_i2c0.parent.ops = &nu_i2c_ops;
ret = rt_i2c_bus_device_register(&nu_i2c0.parent, nu_i2c0.device_name);
RT_ASSERT(RT_EOK == ret);
#endif /* BSP_USING_I2C0 */
#if defined(BSP_USING_I2C1)
I2C_Close(nu_i2c1.I2C);
I2C_Open(nu_i2c1.I2C, 100000);
nu_i2c1.parent.ops = &nu_i2c_ops;
ret = rt_i2c_bus_device_register(&nu_i2c1.parent, nu_i2c1.device_name);
RT_ASSERT(RT_EOK == ret);
#endif /* BSP_USING_I2C1 */
#if defined(BSP_USING_I2C2)
I2C_Close(nu_i2c2.I2C);
I2C_Open(nu_i2c2.I2C, 100000);
nu_i2c2.parent.ops = &nu_i2c_ops;
ret = rt_i2c_bus_device_register(&nu_i2c2.parent, nu_i2c2.device_name);
RT_ASSERT(RT_EOK == ret);
#endif /* BSP_USING_I2C2 */
SYS_LockReg();
return ret;
}
INIT_DEVICE_EXPORT(rt_hw_i2c_init);
#endif /* BSP_USING_I2C */
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