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/**************************************************************************//**
*
* @copyright (C) 2020 Nuvoton Technology Corp. All rights reserved.
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2020-1-14 klcheng First version
*
******************************************************************************/
#include <rtconfig.h>
#if (defined(BSP_USING_UI2C) && defined(RT_USING_I2C))
#include <rtdevice.h>
#include "NuMicro.h"
/* Private define ---------------------------------------------------------------*/
#define LOG_TAG "drv.ui2c"
#define DBG_ENABLE
#define DBG_SECTION_NAME LOG_TAG
#define DBG_LEVEL DBG_INFO
#define DBG_COLOR
#include <rtdbg.h>
#define SLV_10BIT_ADDR (0x1E<<2) //1111+0xx+r/w
/* Private typedef --------------------------------------------------------------*/
typedef struct nu_ui2c_bus
{
struct rt_i2c_bus_device ui2c_dev;
struct rt_i2c_msg *msg;
UI2C_T *ui2c_base;
char *dev_name;
} nu_ui2c_bus_t;
/* Private functions ------------------------------------------------------------*/
static rt_ssize_t nu_ui2c_mst_xfer(struct rt_i2c_bus_device *ui2c_dev,
struct rt_i2c_msg msgs[],
rt_uint32_t num);
static const struct rt_i2c_bus_device_ops nu_ui2c_ops =
{
.master_xfer = nu_ui2c_mst_xfer,
.slave_xfer = NULL,
.i2c_bus_control = NULL,
};
/* Private variables ------------------------------------------------------------*/
#ifdef BSP_USING_UI2C0
#define UI2C0BUS_NAME "ui2c0"
static nu_ui2c_bus_t nu_ui2c0 =
{
.ui2c_base = UI2C0,
.dev_name = UI2C0BUS_NAME,
};
#endif /* BSP_USING_UI2C0 */
#ifdef BSP_USING_UI2C1
#define UI2C1BUS_NAME "ui2c1"
static nu_ui2c_bus_t nu_ui2c1 =
{
.ui2c_base = UI2C1,
.dev_name = UI2C1BUS_NAME,
};
#endif /* BSP_USING_UI2C1 */
/* Functions define ------------------------------------------------------------*/
#if (defined(BSP_USING_UI2C0) || defined(BSP_USING_UI2C1))
static inline rt_err_t nu_ui2c_wait_ready_with_timeout(nu_ui2c_bus_t *nu_ui2c)
{
rt_tick_t start = rt_tick_get();
while (!(UI2C_GET_PROT_STATUS(nu_ui2c->ui2c_base) & (UI2C_PROTSTS_STARIF_Msk | UI2C_PROTSTS_ACKIF_Msk | UI2C_PROTSTS_NACKIF_Msk | UI2C_PROTSTS_STORIF_Msk)))
{
if ((rt_tick_get() - start) > nu_ui2c->ui2c_dev.timeout)
{
LOG_E("\nui2c: timeout!\n");
return -RT_ETIMEOUT;
}
}
return RT_EOK;
}
static inline rt_err_t nu_ui2c_send_data(nu_ui2c_bus_t *nu_ui2c, rt_uint8_t data)
{
UI2C_SET_DATA(nu_ui2c->ui2c_base, data);
UI2C_SET_CONTROL_REG(nu_ui2c->ui2c_base, UI2C_CTL_PTRG);
return nu_ui2c_wait_ready_with_timeout(nu_ui2c);
}
static rt_err_t nu_ui2c_send_address(nu_ui2c_bus_t *nu_ui2c,
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)
{
UI2C_ENABLE_10BIT_ADDR_MODE(nu_ui2c->ui2c_base);
/* Init Send 10-bit Addr */
addr1 = ((msg->addr >> 8) | SLV_10BIT_ADDR) << 1;
addr2 = msg->addr & 0xff;
LOG_D("addr1: %d, addr2: %d\n", addr1, addr2);
ret = nu_ui2c_send_data(nu_ui2c, addr1);
if (ret != RT_EOK) //for timeout condition
return -RT_EIO;
if (((UI2C_GET_PROT_STATUS(nu_ui2c->ui2c_base) & UI2C_PROTSTS_ACKIF_Msk) != UI2C_PROTSTS_ACKIF_Msk) && !ignore_nack)
{
LOG_E("NACK: sending first addr\n");
return -RT_EIO;
}
UI2C_CLR_PROT_INT_FLAG(nu_ui2c->ui2c_base, UI2C_PROTSTS_ACKIF_Msk);
ret = nu_ui2c_send_data(nu_ui2c, addr2);
if (ret != RT_EOK) //for timeout condition
return -RT_EIO;
if (((UI2C_GET_PROT_STATUS(nu_ui2c->ui2c_base) & UI2C_PROTSTS_ACKIF_Msk) != UI2C_PROTSTS_ACKIF_Msk) && !ignore_nack)
{
LOG_E("NACK: sending second addr\n");
return -RT_EIO;
}
UI2C_CLR_PROT_INT_FLAG(nu_ui2c->ui2c_base, UI2C_PROTSTS_ACKIF_Msk);
if (flags & RT_I2C_RD)
{
LOG_D("send repeated start condition\n");
UI2C_SET_CONTROL_REG(nu_ui2c->ui2c_base, (UI2C_CTL_PTRG | UI2C_CTL_STA));
ret = nu_ui2c_wait_ready_with_timeout(nu_ui2c);
if (ret != RT_EOK) //for timeout condition
return -RT_EIO;
if (((UI2C_GET_PROT_STATUS(nu_ui2c->ui2c_base) & UI2C_PROTSTS_STARIF_Msk) != UI2C_PROTSTS_STARIF_Msk) && !ignore_nack)
{
LOG_E("sending repeated START fail\n");
return -RT_EIO;
}
UI2C_CLR_PROT_INT_FLAG(nu_ui2c->ui2c_base, UI2C_PROTSTS_STARIF_Msk);
addr1 |= RT_I2C_RD;
ret = nu_ui2c_send_data(nu_ui2c, addr1);
if (ret != RT_EOK) //for timeout condition
return -RT_EIO;
if (((UI2C_GET_PROT_STATUS(nu_ui2c->ui2c_base) & UI2C_PROTSTS_ACKIF_Msk) != UI2C_PROTSTS_ACKIF_Msk) && !ignore_nack)
{
LOG_E("NACK: sending repeated addr\n");
return -RT_EIO;
}
UI2C_CLR_PROT_INT_FLAG(nu_ui2c->ui2c_base, UI2C_PROTSTS_ACKIF_Msk);
}
}
else
{
/* 7-bit addr */
addr1 = msg->addr << 1;
if (flags & RT_I2C_RD)
addr1 |= RT_I2C_RD;
/* Send device address */
ret = nu_ui2c_send_data(nu_ui2c, addr1); /* Send Address */
if (ret != RT_EOK) //for timeout condition
return -RT_EIO;
if (((UI2C_GET_PROT_STATUS(nu_ui2c->ui2c_base) & UI2C_PROTSTS_ACKIF_Msk) != UI2C_PROTSTS_ACKIF_Msk)
&& !ignore_nack)
{
LOG_E("sending addr fail\n");
return -RT_EIO;
}
UI2C_CLR_PROT_INT_FLAG(nu_ui2c->ui2c_base, UI2C_PROTSTS_ACKIF_Msk);
}
return RT_EOK;
}
static rt_ssize_t nu_ui2c_mst_xfer(struct rt_i2c_bus_device *bus,
struct rt_i2c_msg msgs[],
rt_uint32_t num)
{
struct rt_i2c_msg *msg;
nu_ui2c_bus_t *nu_ui2c;
rt_size_t i;
rt_uint32_t cnt_data;
rt_uint16_t ignore_nack;
rt_err_t ret;
RT_ASSERT(bus != RT_NULL);
nu_ui2c = (nu_ui2c_bus_t *) bus;
nu_ui2c->msg = msgs;
(nu_ui2c->ui2c_base)->PROTSTS = (nu_ui2c->ui2c_base)->PROTSTS;//Clear status
UI2C_SET_CONTROL_REG(nu_ui2c->ui2c_base, UI2C_CTL_STA);
ret = nu_ui2c_wait_ready_with_timeout(nu_ui2c);
if (ret != RT_EOK) //for timeout condition
{
rt_set_errno(-RT_ETIMEOUT);
return 0;
}
if (((UI2C_GET_PROT_STATUS(nu_ui2c->ui2c_base) & UI2C_PROTSTS_STARIF_Msk) != UI2C_PROTSTS_STARIF_Msk)) /* Check Send START */
{
i = 0;
LOG_E("Send START Fail");
return i;
}
UI2C_CLR_PROT_INT_FLAG(nu_ui2c->ui2c_base, UI2C_PROTSTS_STARIF_Msk);
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)
{
UI2C_SET_CONTROL_REG(nu_ui2c->ui2c_base, (UI2C_CTL_PTRG | UI2C_CTL_STA));/* Send repeat START */
ret = nu_ui2c_wait_ready_with_timeout(nu_ui2c);
if (ret != RT_EOK) //for timeout condition
break;
if (((UI2C_GET_PROT_STATUS(nu_ui2c->ui2c_base) & UI2C_PROTSTS_STARIF_Msk) != UI2C_PROTSTS_STARIF_Msk)) /* Check Send repeat START */
{
i = 0;
LOG_E("Send repeat START Fail");
break;
}
UI2C_CLR_PROT_INT_FLAG(nu_ui2c->ui2c_base, UI2C_PROTSTS_STARIF_Msk);
}
if ((RT_EOK != nu_ui2c_send_address(nu_ui2c, msg))
&& !ignore_nack)
{
i = 0;
LOG_E("Send Address Fail");
break;
}
}
if (nu_ui2c->msg[i].flags & RT_I2C_RD) /* Receive Bytes */
{
rt_uint32_t do_rd_nack = (i == (num - 1));
for (cnt_data = 0 ; cnt_data < (nu_ui2c->msg[i].len) ; cnt_data++)
{
do_rd_nack += (cnt_data == (nu_ui2c->msg[i].len - 1)); /* NACK after last byte for hardware setting */
if (do_rd_nack == 2)
{
UI2C_SET_CONTROL_REG(nu_ui2c->ui2c_base, UI2C_CTL_PTRG);
}
else
{
UI2C_SET_CONTROL_REG(nu_ui2c->ui2c_base, (UI2C_CTL_PTRG | UI2C_CTL_AA));
}
ret = nu_ui2c_wait_ready_with_timeout(nu_ui2c);
if (ret != RT_EOK) //for timeout condition
break;
if (nu_ui2c->ui2c_base->PROTCTL & UI2C_CTL_AA)
{
if (((UI2C_GET_PROT_STATUS(nu_ui2c->ui2c_base) & UI2C_PROTSTS_ACKIF_Msk) != UI2C_PROTSTS_ACKIF_Msk)) /*Master Receive Data ACK*/
{
i = 0;
break;
}
UI2C_CLR_PROT_INT_FLAG(nu_ui2c->ui2c_base, UI2C_PROTSTS_ACKIF_Msk);
}
else
{
if (((UI2C_GET_PROT_STATUS(nu_ui2c->ui2c_base) & UI2C_PROTSTS_NACKIF_Msk) != UI2C_PROTSTS_NACKIF_Msk)) /*Master Receive Data NACK*/
{
i = 0;
break;
}
UI2C_CLR_PROT_INT_FLAG(nu_ui2c->ui2c_base, UI2C_PROTSTS_NACKIF_Msk);
}
nu_ui2c->msg[i].buf[cnt_data] = nu_ui2c->ui2c_base->RXDAT;
}
}
else /* Send Bytes */
{
for (cnt_data = 0 ; cnt_data < (nu_ui2c->msg[i].len) ; cnt_data++)
{
/* Send register number and MSB of data */
ret = nu_ui2c_send_data(nu_ui2c, (uint8_t)(nu_ui2c->msg[i].buf[cnt_data]));
if (ret != RT_EOK) //for timeout condition
break;
if (((UI2C_GET_PROT_STATUS(nu_ui2c->ui2c_base) & UI2C_PROTSTS_ACKIF_Msk) != UI2C_PROTSTS_ACKIF_Msk)
&& !ignore_nack
) /* Send data and get Ack */
{
i = 0;
break;
}
UI2C_CLR_PROT_INT_FLAG(nu_ui2c->ui2c_base, UI2C_PROTSTS_ACKIF_Msk);
}
}
}
UI2C_SET_CONTROL_REG(nu_ui2c->ui2c_base, (UI2C_CTL_PTRG | UI2C_CTL_STO)); /* Send STOP signal */
ret = nu_ui2c_wait_ready_with_timeout(nu_ui2c);
if (ret != RT_EOK) //for timeout condition
{
rt_set_errno(-RT_ETIMEOUT);
return 0;
}
RT_ASSERT(((UI2C_GET_PROT_STATUS(nu_ui2c->ui2c_base) & UI2C_PROTSTS_STORIF_Msk) == UI2C_PROTSTS_STORIF_Msk));
if (((UI2C_GET_PROT_STATUS(nu_ui2c->ui2c_base) & UI2C_PROTSTS_STORIF_Msk) != UI2C_PROTSTS_STORIF_Msk)) /* Bus Free*/
{
i = 0;
LOG_E("Send STOP Fail");
}
UI2C_CLR_PROT_INT_FLAG(nu_ui2c->ui2c_base, UI2C_PROTSTS_STORIF_Msk);
UI2C_SET_CONTROL_REG(nu_ui2c->ui2c_base, UI2C_CTL_PTRG);
UI2C_DISABLE_10BIT_ADDR_MODE(nu_ui2c->ui2c_base); /*clear all sub modes like 10 bit mode*/
nu_ui2c->msg = RT_NULL;
return i;
}
#endif //(defined(BSP_USING_UI2C0) || defined(BSP_USING_UI2C1))
/* Public functions -------------------------------------------------------------*/
int rt_hw_ui2c_init(void)
{
rt_err_t ret = -RT_ERROR;
#if defined(BSP_USING_UI2C0)
SYS_UnlockReg();
SYS_ResetModule(USCI0_RST);
SYS_LockReg();
nu_ui2c0.ui2c_dev.ops = &nu_ui2c_ops;
UI2C_Open(nu_ui2c0.ui2c_base, 100000);
ret = rt_i2c_bus_device_register(&nu_ui2c0.ui2c_dev, nu_ui2c0.dev_name);
RT_ASSERT(RT_EOK == ret);
#endif /* BSP_USING_UI2C0 */
#if defined(BSP_USING_UI2C1)
SYS_UnlockReg();
SYS_ResetModule(USCI1_RST);
SYS_LockReg();
nu_ui2c1.ui2c_dev.ops = &nu_ui2c_ops;
UI2C_Open(nu_ui2c1.ui2c_base, 100000);
ret = rt_i2c_bus_device_register(&nu_ui2c1.ui2c_dev, nu_ui2c1.dev_name);
RT_ASSERT(RT_EOK == ret);
#endif /* BSP_USING_UI2C1 */
return ret;
}
INIT_DEVICE_EXPORT(rt_hw_ui2c_init);
#endif //#if defined(BSP_USING_UI2C)
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